diff --git a/changes/1506.feature.md b/changes/1506.feature.md
new file mode 100644
index 00000000000..e5056d80382
--- /dev/null
+++ b/changes/1506.feature.md
@@ -0,0 +1 @@
+Add Raft-based leader election process to manager group in HA condition in order to make their states consistent.
diff --git a/client_example.py b/client_example.py
new file mode 100644
index 00000000000..adb37c60917
--- /dev/null
+++ b/client_example.py
@@ -0,0 +1,42 @@
+import asyncio
+import pickle
+
+from rraft import ConfChange, ConfChangeType
+
+from raftify.log_entry.set_command import SetCommand
+from raftify.raft_client import RaftClient
+from raftify.utils import SocketAddr
+
+
+async def main() -> None:
+    """
+    A simple set of commands to test and show usage of RaftClient.
+    Please bootstrap the Raft cluster before running this script.
+    """
+
+    print("---Message propose---")
+    await RaftClient("192.168.0.37:60151").propose(SetCommand("1", "B").encode())
+
+    # print("---Message propose rerouting---")
+    # await RaftClient("127.0.0.1:60062").propose(SetCommand("2", "A").encode())
+
+    # print("---Debug node result---", await RaftClient("127.0.0.1:60061").debug_node())
+
+    # print(
+    #     "---Debug peers---",
+    #     pickle.loads((await RaftClient("127.0.0.1:60061").get_peers()).peers),
+    # )
+
+    # print("---Make Confchange manually---")
+    # addr = SocketAddr.from_str("127.0.0.1:60062")
+
+    # conf_change = ConfChange.default()
+    # conf_change.set_node_id(2)
+    # conf_change.set_context(pickle.dumps([addr]))
+    # conf_change.set_change_type(ConfChangeType.RemoveNode)
+
+    # await RaftClient(addr).change_config(conf_change)
+
+
+if __name__ == "__main__":
+    asyncio.run(main())
diff --git a/configs/manager/halfstack.toml b/configs/manager/halfstack.toml
index 657f39da28e..a0e7be5bdb9 100644
--- a/configs/manager/halfstack.toml
+++ b/configs/manager/halfstack.toml
@@ -14,7 +14,7 @@ password = "develove"
 
 
 [manager]
-num-proc = 4
+num-proc = 3
 service-addr = { host = "0.0.0.0", port = 8081 }
 #user = "nobody"
 #group = "nobody"
@@ -33,6 +33,28 @@ hide-agents = true
 # The order of agent selection.
 agent-selection-resource-priority = ["cuda", "rocm", "tpu", "cpu", "mem"]
 
+[raft]
+heartbeat-tick = 3
+election-tick = 10
+log-dir = "./logs"
+slog-level = "debug"
+log-level = "debug"
+
+[[raft.peers]]
+host = "127.0.0.1"
+port = 60151
+node-id = 1
+
+[[raft.peers]]
+host = "127.0.0.1"
+port = 60152
+node-id = 2
+
+[[raft.peers]]
+host = "127.0.0.1"
+port = 60153
+node-id = 3
+
 [docker-registry]
 ssl-verify = false
 
diff --git a/python.lock b/python.lock
index 933de779a10..1f85609f683 100644
--- a/python.lock
+++ b/python.lock
@@ -71,8 +71,10 @@
 //     "python-dotenv~=0.20.0",
 //     "python-json-logger>=2.0.1",
 //     "pyzmq~=24.0.1",
+//     "raftify==0.0.62",
 //     "redis[hiredis]==4.5.5",
 //     "rich~=12.2",
+//     "rraft-py==0.2.27",
 //     "setproctitle~=1.3.2",
 //     "tabulate~=0.8.9",
 //     "tblib~=1.7",
@@ -386,21 +388,21 @@
           "artifacts": [
             {
               "algorithm": "sha256",
-              "hash": "1160486b5ea96fcae6170cf2bdef029b9d3a283b7dbeabb3d7f1182769bfb6b7",
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+              "hash": "d2c26defbb9b440ea2685ec132e90700907fd10bcca3e85ec2f157219f0d26f7",
+              "url": "https://files.pythonhosted.org/packages/e4/1e/c259a960a4dff46840133ce19682ef14db2922da80a6088283ec9c3f647a/aioresponses-0.7.6-py2.py3-none-any.whl"
             },
             {
               "algorithm": "sha256",
-              "hash": "9b8c108b36354c04633bad0ea752b55d956a7602fe3e3234b939fc44af96f1d8",
-              "url": "https://files.pythonhosted.org/packages/7e/71/5524889790f7fc9385d8d71a92b5b4a927c652be0a216d89a217a07f5239/aioresponses-0.7.4.tar.gz"
+              "hash": "f795d9dbda2d61774840e7e32f5366f45752d1adc1b74c9362afd017296c7ee1",
+              "url": "https://files.pythonhosted.org/packages/ff/63/bb78ed078e2d514050aadc42a932465a83c43c628746f0e788500ec0bf5d/aioresponses-0.7.6.tar.gz"
             }
           ],
           "project_name": "aioresponses",
           "requires_dists": [
-            "aiohttp<4.0.0,>=2.0.0"
+            "aiohttp<4.0.0,>=3.3.0"
           ],
           "requires_python": null,
-          "version": "0.7.4"
+          "version": "0.7.6"
         },
         {
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@@ -513,13 +515,13 @@
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             {
               "algorithm": "sha256",
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-              "url": "https://files.pythonhosted.org/packages/a2/8b/46919127496036c8e990b2b236454a0d8655fd46e1df2fd35610a9cbc842/alembic-1.12.0-py3-none-any.whl"
+              "hash": "47d52e3dfb03666ed945becb723d6482e52190917fdb47071440cfdba05d92cb",
+              "url": "https://files.pythonhosted.org/packages/34/47/95d8f99c9f4a57079dfbcff5e023c5d81bde092d1c2354156340a56b3a1a/alembic-1.12.1-py3-none-any.whl"
             },
             {
               "algorithm": "sha256",
-              "hash": "8e7645c32e4f200675e69f0745415335eb59a3663f5feb487abfa0b30c45888b",
-              "url": "https://files.pythonhosted.org/packages/7d/bb/b254ca205628bfad1dbf4fe3826777b2638d74dd0c0b6ccc706d7a205def/alembic-1.12.0.tar.gz"
+              "hash": "bca5877e9678b454706347bc10b97cb7d67f300320fa5c3a94423e8266e2823f",
+              "url": "https://files.pythonhosted.org/packages/44/b4/253fe31261d9f5d603d89bd9e6fba1625494a6d761d319902dfe4db59016/alembic-1.12.1.tar.gz"
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           "project_name": "alembic",
@@ -532,7 +534,7 @@
             "typing-extensions>=4"
           ],
           "requires_python": ">=3.7",
-          "version": "1.12.0"
+          "version": "1.12.1"
         },
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@@ -559,6 +561,42 @@
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           "version": "9.0.1"
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+            },
+            {
+              "algorithm": "sha256",
+              "hash": "5a0bec7085176715be77df87fc66d6c9d70626bd752fcc85f57cdbee5b3760da",
+              "url": "https://files.pythonhosted.org/packages/6e/57/075e07fb01ae2b740289ec9daec670f60c06f62d04b23a68077fd5d73fab/anyio-4.1.0.tar.gz"
+            }
+          ],
+          "project_name": "anyio",
+          "requires_dists": [
+            "Sphinx>=7; extra == \"doc\"",
+            "anyio[trio]; extra == \"test\"",
+            "coverage[toml]>=7; extra == \"test\"",
+            "exceptiongroup>=1.0.2; python_version < \"3.11\"",
+            "exceptiongroup>=1.2.0; extra == \"test\"",
+            "hypothesis>=4.0; extra == \"test\"",
+            "idna>=2.8",
+            "packaging; extra == \"doc\"",
+            "psutil>=5.9; extra == \"test\"",
+            "pytest-mock>=3.6.1; extra == \"test\"",
+            "pytest>=7.0; extra == \"test\"",
+            "sniffio>=1.1",
+            "sphinx-autodoc-typehints>=1.2.0; extra == \"doc\"",
+            "sphinx-rtd-theme; extra == \"doc\"",
+            "trio>=0.23; extra == \"trio\"",
+            "trustme; extra == \"test\"",
+            "uvloop>=0.17; (platform_python_implementation == \"CPython\" and platform_system != \"Windows\") and extra == \"test\""
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-              "url": "https://files.pythonhosted.org/packages/b1/0a/e38bd743f91fe6b54a2686dfe504acd1d883cc6fc5c9116bdb737a0f2622/types-pyOpenSSL-23.2.0.2.tar.gz"
+              "hash": "5ffb077fe70b699c88d5caab999ae80e192fe28bf6cda7989b7e79b1e4e2dcd3",
+              "url": "https://files.pythonhosted.org/packages/a4/43/32f874b5fa2240932d758c8f4350632e4edd19e662032ff4992ebcd8a882/types-pyOpenSSL-23.3.0.0.tar.gz"
             }
           ],
           "project_name": "types-pyopenssl",
           "requires_dists": [
             "cryptography>=35.0.0"
           ],
-          "requires_python": null,
-          "version": "23.2.0.2"
+          "requires_python": ">=3.7",
+          "version": "23.3.0.0"
         },
         {
           "artifacts": [
@@ -4011,13 +4160,13 @@
           "artifacts": [
             {
               "algorithm": "sha256",
-              "hash": "05b1bf92879b25df20433fa1af07784a0d7928c616dc2ebf9087618db77ccbd0",
-              "url": "https://files.pythonhosted.org/packages/6d/71/abcbebae9f5bd0e41d39e7cf8709c4f06b8ab8334c21bf6a7cd8e0a69f05/types_redis-4.6.0.7-py3-none-any.whl"
+              "hash": "94fc61118601fb4f79206b33b9f4344acff7ca1d7bba67834987fb0efcf6a770",
+              "url": "https://files.pythonhosted.org/packages/5f/3e/63dabc15151422daad7b0f2f82c0a37d1edc5d9278dfc05fe7f9cc42cd3d/types_redis-4.6.0.11-py3-none-any.whl"
             },
             {
               "algorithm": "sha256",
-              "hash": "28c4153ddb5c9d4f10def44a2454673c361d2d5fc3cd867cf3bb1520f3f59a38",
-              "url": "https://files.pythonhosted.org/packages/f7/64/5d64db485d6dc1bc6b3afdac5ecc0f50ed4f357b75bd73cc2ca9b53632f4/types-redis-4.6.0.7.tar.gz"
+              "hash": "c8cfc84635183deca2db4a528966c5566445fd3713983f0034fb0f5a09e0890d",
+              "url": "https://files.pythonhosted.org/packages/a9/b9/68d600512c73df22477f09236a978dbc00bd0f6215308c2deac69e6f9aa0/types-redis-4.6.0.11.tar.gz"
             }
           ],
           "project_name": "types-redis",
@@ -4025,26 +4174,26 @@
             "cryptography>=35.0.0",
             "types-pyOpenSSL"
           ],
-          "requires_python": null,
-          "version": "4.6.0.7"
+          "requires_python": ">=3.7",
+          "version": "4.6.0.11"
         },
         {
           "artifacts": [
             {
               "algorithm": "sha256",
-              "hash": "77edcc843e53f8fc83bb1a840684841f3dc804ec94562623bfa2ea70d5a2ba1b",
-              "url": "https://files.pythonhosted.org/packages/5c/5a/fbfbe3d1db90c59fb0240cf13a84953677b15874d00e80e773425447633c/types_setuptools-68.2.0.0-py3-none-any.whl"
+              "hash": "8c86195bae2ad81e6dea900a570fe9d64a59dbce2b11cc63c046b03246ea77bf",
+              "url": "https://files.pythonhosted.org/packages/66/a3/9800e99c4081cb1bff0ec10bf6effb93edc9253ce2ec6db50be1a9d57053/types_setuptools-69.0.0.0-py3-none-any.whl"
             },
             {
               "algorithm": "sha256",
-              "hash": "a4216f1e2ef29d089877b3af3ab2acf489eb869ccaf905125c69d2dc3932fd85",
-              "url": "https://files.pythonhosted.org/packages/1f/32/ad55729b96c07993bbf83a0a734a3ee8402ea42268939aeae30c4f3600d0/types-setuptools-68.2.0.0.tar.gz"
+              "hash": "b0a06219f628c6527b2f8ce770a4f47550e00d3e8c3ad83e2dc31bc6e6eda95d",
+              "url": "https://files.pythonhosted.org/packages/aa/dc/27d4819c27b504bbd2e8ae5aa907fe72c70af8ff90b8b4cdb96316275844/types-setuptools-69.0.0.0.tar.gz"
             }
           ],
           "project_name": "types-setuptools",
           "requires_dists": [],
-          "requires_python": null,
-          "version": "68.2.0.0"
+          "requires_python": ">=3.7",
+          "version": "69.0.0.0"
         },
         {
           "artifacts": [
@@ -4219,13 +4368,13 @@
           "artifacts": [
             {
               "algorithm": "sha256",
-              "hash": "77f719e01648ed600dfa5402c347481c0992263b81a027344f3e1ba25493a704",
-              "url": "https://files.pythonhosted.org/packages/58/19/a9ce39f89cf58cf1e7ce01c8bb76ab7e2c7aadbc5a2136c3e192097344f5/wcwidth-0.2.8-py2.py3-none-any.whl"
+              "hash": "f26ec43d96c8cbfed76a5075dac87680124fa84e0855195a6184da9c187f133c",
+              "url": "https://files.pythonhosted.org/packages/31/b1/a59de0ad3aabb17523a39804f4c6df3ae87ead053a4e25362ae03d73d03a/wcwidth-0.2.12-py2.py3-none-any.whl"
             },
             {
               "algorithm": "sha256",
-              "hash": "8705c569999ffbb4f6a87c6d1b80f324bd6db952f5eb0b95bc07517f4c1813d4",
-              "url": "https://files.pythonhosted.org/packages/cb/ee/20850e9f388d8b52b481726d41234f67bc89a85eeade6e2d6e2965be04ba/wcwidth-0.2.8.tar.gz"
+              "hash": "f01c104efdf57971bcb756f054dd58ddec5204dd15fa31d6503ea57947d97c02",
+              "url": "https://files.pythonhosted.org/packages/d7/12/63deef355537f290d5282a67bb7bdd165266e4eca93cd556707a325e5a24/wcwidth-0.2.12.tar.gz"
             }
           ],
           "project_name": "wcwidth",
@@ -4233,7 +4382,7 @@
             "backports.functools-lru-cache>=1.2.1; python_version < \"3.2\""
           ],
           "requires_python": null,
-          "version": "0.2.8"
+          "version": "0.2.12"
         },
         {
           "artifacts": [
@@ -4430,8 +4579,10 @@
     "python-dotenv~=0.20.0",
     "python-json-logger>=2.0.1",
     "pyzmq~=24.0.1",
+    "raftify==0.0.62",
     "redis[hiredis]==4.5.5",
     "rich~=12.2",
+    "rraft-py==0.2.27",
     "setproctitle~=1.3.2",
     "tabulate~=0.8.9",
     "tblib~=1.7",
diff --git a/requirements.txt b/requirements.txt
index 67bd4a2c9ff..e2bdf361ae5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -91,3 +91,6 @@ types-tabulate
 
 backend.ai-krunner-alpine==5.1.0
 backend.ai-krunner-static-gnu==4.1.0
+
+rraft-py==0.2.27
+raftify==0.0.62
diff --git a/src/ai/backend/common/distributed.py b/src/ai/backend/common/distributed.py
index b52fe2414a1..2a3563cc8b9 100644
--- a/src/ai/backend/common/distributed.py
+++ b/src/ai/backend/common/distributed.py
@@ -1,10 +1,12 @@
 from __future__ import annotations
 
+import abc
 import asyncio
 import logging
 from typing import TYPE_CHECKING, Callable, Final
 
 from aiomonitor.task import preserve_termination_log
+from raftify import RaftNode
 
 from .logging import BraceStyleAdapter
 
@@ -16,7 +18,77 @@
 log = BraceStyleAdapter(logging.getLogger(__spec__.name))  # type: ignore[name-defined]
 
 
-class GlobalTimer:
+class AbstractGlobalTimer(metaclass=abc.ABCMeta):
+    @abc.abstractmethod
+    async def generate_tick(self) -> None:
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    async def join(self) -> None:
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    async def leave(self) -> None:
+        raise NotImplementedError
+
+
+class RaftGlobalTimer(AbstractGlobalTimer):
+    """
+    Executes the given async function only once in the given interval,
+    uniquely among multiple manager instances across multiple nodes.
+    """
+
+    _event_producer: Final[EventProducer]
+
+    def __init__(
+        self,
+        raft_node: RaftNode,
+        event_producer: EventProducer,
+        event_factory: Callable[[], AbstractEvent],
+        interval: float = 10.0,
+        initial_delay: float = 0.0,
+    ) -> None:
+        self._event_producer = event_producer
+        self._event_factory = event_factory
+        self._stopped = False
+        self.interval = interval
+        self.initial_delay = initial_delay
+        self.raft_node = raft_node
+
+    async def generate_tick(self) -> None:
+        try:
+            await asyncio.sleep(self.initial_delay)
+            if self._stopped:
+                return
+            while True:
+                try:
+                    if self._stopped:
+                        return
+                    if self.raft_node.is_leader():
+                        await self._event_producer.produce_event(self._event_factory())
+                    if self._stopped:
+                        return
+                    await asyncio.sleep(self.interval)
+                except asyncio.TimeoutError:  # timeout raised from etcd lock
+                    log.warn("timeout raised while trying to acquire lock. retrying...")
+        except asyncio.CancelledError:
+            pass
+
+    async def join(self) -> None:
+        self._tick_task = asyncio.create_task(self.generate_tick())
+
+    async def leave(self) -> None:
+        self._stopped = True
+        await asyncio.sleep(0)
+        if not self._tick_task.done():
+            try:
+                self._tick_task.cancel()
+                await self._tick_task
+            except asyncio.CancelledError:
+                pass
+
+
+class DistributedLockGlobalTimer(AbstractGlobalTimer):
     """
     Executes the given async function only once in the given interval,
     uniquely among multiple manager instances across multiple nodes.
diff --git a/src/ai/backend/manager/api/context.py b/src/ai/backend/manager/api/context.py
index d8a989b15e1..3616517f1d0 100644
--- a/src/ai/backend/manager/api/context.py
+++ b/src/ai/backend/manager/api/context.py
@@ -1,8 +1,9 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Optional, cast
 
 import attrs
+from raftify import RaftFacade, RaftNode
 
 if TYPE_CHECKING:
     from ai.backend.common.bgtask import BackgroundTaskManager
@@ -26,6 +27,31 @@ class BaseContext:
     pass
 
 
+class RaftClusterContext:
+    _cluster: Optional[RaftFacade] = None
+    bootstrap_done: bool
+    node_id_start: int
+
+    def __init__(self, bootstrap_done: bool = False, node_id_start: int = 1) -> None:
+        self.bootstrap_done = bootstrap_done
+        self.node_id_start = node_id_start
+
+    def use_raft(self) -> bool:
+        return self._cluster is not None
+
+    @property
+    def cluster(self) -> RaftFacade:
+        return cast(RaftFacade, self._cluster)
+
+    @cluster.setter
+    def cluster(self, rhs: RaftFacade) -> None:
+        self._cluster = rhs
+
+    @property
+    def raft_node(self) -> RaftNode:
+        return cast(RaftNode, cast(RaftFacade, self._cluster).raft_node)
+
+
 @attrs.define(slots=True, auto_attribs=True, init=False)
 class RootContext(BaseContext):
     pidx: int
@@ -53,3 +79,4 @@ class RootContext(BaseContext):
     error_monitor: ErrorPluginContext
     stats_monitor: StatsPluginContext
     background_task_manager: BackgroundTaskManager
+    raft_ctx: RaftClusterContext
diff --git a/src/ai/backend/manager/api/logs.py b/src/ai/backend/manager/api/logs.py
index 48854d17f67..3d014c70289 100644
--- a/src/ai/backend/manager/api/logs.py
+++ b/src/ai/backend/manager/api/logs.py
@@ -14,7 +14,11 @@
 from dateutil.relativedelta import relativedelta
 
 from ai.backend.common import validators as tx
-from ai.backend.common.distributed import GlobalTimer
+from ai.backend.common.distributed import (
+    AbstractGlobalTimer,
+    DistributedLockGlobalTimer,
+    RaftGlobalTimer,
+)
 from ai.backend.common.events import AbstractEvent, EmptyEventArgs, EventHandler
 from ai.backend.common.logging import BraceStyleAdapter
 from ai.backend.common.types import AgentId, LogSeverity
@@ -238,7 +242,7 @@ async def log_cleanup_task(app: web.Application, src: AgentId, event: DoLogClean
 
 @attrs.define(slots=True, auto_attribs=True, init=False)
 class PrivateContext:
-    log_cleanup_timer: GlobalTimer
+    log_cleanup_timer: AbstractGlobalTimer
     log_cleanup_timer_evh: EventHandler[web.Application, DoLogCleanupEvent]
 
 
@@ -250,14 +254,24 @@ async def init(app: web.Application) -> None:
         app,
         log_cleanup_task,
     )
-    app_ctx.log_cleanup_timer = GlobalTimer(
-        root_ctx.distributed_lock_factory(LockID.LOCKID_LOG_CLEANUP_TIMER, 20.0),
-        root_ctx.event_producer,
-        lambda: DoLogCleanupEvent(),
-        20.0,
-        initial_delay=17.0,
-        task_name="log_cleanup_task",
-    )
+
+    if root_ctx.raft_ctx.use_raft():
+        app_ctx.log_cleanup_timer = RaftGlobalTimer(
+            root_ctx.raft_ctx.raft_node,
+            root_ctx.event_producer,
+            lambda: DoLogCleanupEvent(),
+            20.0,
+            initial_delay=17.0,
+        )
+    else:
+        app_ctx.log_cleanup_timer = DistributedLockGlobalTimer(
+            root_ctx.distributed_lock_factory(LockID.LOCKID_LOG_CLEANUP_TIMER, 20.0),
+            root_ctx.event_producer,
+            lambda: DoLogCleanupEvent(),
+            20.0,
+            initial_delay=17.0,
+            task_name="log_cleanup_task",
+        )
     await app_ctx.log_cleanup_timer.join()
 
 
diff --git a/src/ai/backend/manager/cli/__main__.py b/src/ai/backend/manager/cli/__main__.py
index 4a3141823d7..99107fc30ac 100644
--- a/src/ai/backend/manager/cli/__main__.py
+++ b/src/ai/backend/manager/cli/__main__.py
@@ -1,8 +1,10 @@
 from __future__ import annotations
 
 import asyncio
+import json
 import logging
 import pathlib
+import pickle
 import subprocess
 import sys
 from datetime import datetime
@@ -10,7 +12,11 @@
 
 import click
 from more_itertools import chunked
+from raftify.peers import Peer, Peers
+from raftify.raft_client import RaftClient
+from raftify.utils import SocketAddr
 from setproctitle import setproctitle
+from tabulate import tabulate
 
 from ai.backend.cli.types import ExitCode
 from ai.backend.common import redis_helper as redis_helper
@@ -325,6 +331,66 @@ async def _clear_terminated_sessions():
     asyncio.run(_clear_terminated_sessions())
 
 
+async def inspect_node_status(cli_ctx: CLIContext) -> None:
+    raft_configs = cli_ctx.local_config["raft"]
+    table = []
+    headers = ["ENDPOINT", "NODE ID", "IS LEADER", "RAFT TERM", "RAFT APPLIED INDEX"]
+
+    if raft_configs is not None:
+        initial_peers = Peers(
+            {
+                int(peer_config["node-id"]): Peer(
+                    addr=SocketAddr(peer_config["host"], peer_config["port"])
+                )
+                for peer_config in raft_configs.pop("peers")
+            }
+        )
+
+        peers: Peers | None = None
+        for peer in initial_peers.values():
+            raft_client = RaftClient(peer.addr)
+            try:
+                resp = await raft_client.get_peers()
+                peers = pickle.loads(resp.peers)
+            except Exception:
+                continue
+
+        if not peers:
+            print("No peers are available!")
+            return
+
+        for peer in peers.values():
+            raft_client = RaftClient(peer.addr)
+
+            resp = await raft_client.debug_node()
+
+            node_info = json.loads(resp.result)
+            is_leader = node_info["node_id"] == node_info["current_leader_id"]
+            table.append(
+                [
+                    peer.addr,
+                    node_info["node_id"],
+                    is_leader,
+                    node_info["raft"]["term"],
+                    node_info["raft_log"]["applied"],
+                ]
+            )
+
+    table = [headers, *sorted(table, key=lambda x: str(x[0]))]
+    print(
+        tabulate(table, headers="firstrow", tablefmt="grid", stralign="center", numalign="center")
+    )
+
+
+@main.command()
+@click.pass_obj
+def status(cli_ctx: CLIContext) -> None:
+    """
+    Collect and print each manager process's status.
+    """
+    asyncio.run(inspect_node_status(cli_ctx))
+
+
 @main.group(cls=LazyGroup, import_name="ai.backend.manager.cli.dbschema:cli")
 def schema():
     """Command set for managing the database schema."""
diff --git a/src/ai/backend/manager/config.py b/src/ai/backend/manager/config.py
index e8a54342cb5..de3f660056f 100644
--- a/src/ai/backend/manager/config.py
+++ b/src/ai/backend/manager/config.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 """
 Configuration Schema on etcd
 ----------------------------
@@ -171,8 +173,6 @@
        - {instance-id}: 1  # just a membership set
 """
 
-from __future__ import annotations
-
 import json
 import logging
 import os
@@ -215,6 +215,7 @@
     SlotTypes,
     current_resource_slots,
 )
+from ai.backend.manager.types import RaftLogLovel, RaftSlogLovel
 
 from ..manager.defs import INTRINSIC_SLOTS
 from .api import ManagerStatus
@@ -292,6 +293,44 @@
                     t.Key("aiomonitor-webui-port", default=49100): t.ToInt[1:65535],
                 }
             ).allow_extra("*"),
+            t.Key("raft", default=None): (
+                t.Dict(
+                    {
+                        t.Key("peers"): t.List(
+                            t.Dict(
+                                {
+                                    t.Key("node-id"): t.Int,
+                                    t.Key("host"): t.String,
+                                    t.Key("port"): t.Int,
+                                }
+                            )
+                        ),
+                        t.Key("cluster-leader-id", default=1): t.Int,
+                        t.Key("heartbeat-tick", default=None): t.Int | t.Null,
+                        t.Key("election-tick", default=None): t.Int | t.Null,
+                        t.Key("min-election-tick", default=None): t.Int | t.Null,
+                        t.Key("max-election-tick", default=None): t.Int | t.Null,
+                        t.Key("max-committed-size-per-ready", default=None): t.Int | t.Null,
+                        t.Key("max-size-per-msg", default=None): t.Int | t.Null,
+                        t.Key("max-inflight-msgs", default=None): t.Int | t.Null,
+                        t.Key("check-quorum", default=None): t.Bool | t.Null,
+                        t.Key("batch-append", default=None): t.Bool | t.Null,
+                        t.Key("max-uncommitted-size", default=None): t.Int | t.Null,
+                        t.Key("skip-bcast-commit", default=None): t.Bool | t.Null,
+                        t.Key("pre-vote", default=None): t.Bool | t.Null,
+                        t.Key("priority", default=None): t.Int | t.Null,
+                        t.Key("log-dir"): t.String,
+                        t.Key("slog-level", default=None): tx.Enum(RaftSlogLovel) | t.Null,
+                        t.Key("log-level", default=None): tx.Enum(RaftLogLovel) | t.Null,
+                    }
+                ).allow_extra("*")
+                | t.Null
+            ),
+            t.Key("pipeline", default=None): t.Null | t.Dict(
+                {
+                    t.Key("event-queue", default=None): t.Null | tx.HostPortPair,
+                },
+            ).allow_extra("*"),
             t.Key("docker-registry"): t.Dict(
                 {  # deprecated in v20.09
                     t.Key("ssl-verify", default=True): t.ToBool,
@@ -351,6 +390,7 @@
             "threshold": {},
         },
     },
+    "raft": None,
 }
 
 container_registry_iv = t.Dict(
@@ -482,7 +522,6 @@ def container_registry_serialize(v: dict[str, Any]) -> dict[str, str]:
                 ): session_hang_tolerance_iv,
             },
         ).allow_extra("*"),
-        t.Key("roundrobin_states", default=None): t.Null | tx.RoundRobinStatesJSONString,
     }
 ).allow_extra("*")
 
diff --git a/src/ai/backend/manager/idle.py b/src/ai/backend/manager/idle.py
index 3243c7ac210..66b8c4a5b2a 100644
--- a/src/ai/backend/manager/idle.py
+++ b/src/ai/backend/manager/idle.py
@@ -35,7 +35,11 @@
 import ai.backend.common.validators as tx
 from ai.backend.common import msgpack, redis_helper
 from ai.backend.common.defs import REDIS_LIVE_DB, REDIS_STAT_DB
-from ai.backend.common.distributed import GlobalTimer
+from ai.backend.common.distributed import (
+    AbstractGlobalTimer,
+    DistributedLockGlobalTimer,
+    RaftGlobalTimer,
+)
 from ai.backend.common.events import (
     AbstractEvent,
     DoIdleCheckEvent,
@@ -58,13 +62,14 @@
     SessionTypes,
 )
 from ai.backend.common.utils import nmget
+from ai.backend.manager.api.context import RaftClusterContext
+from ai.backend.manager.types import DistributedLockFactory
 
 from .defs import DEFAULT_ROLE, LockID
 from .models.kernel import LIVE_STATUS, kernels
 from .models.keypair import keypairs
 from .models.resource_policy import keypair_resource_policies
 from .models.user import users
-from .types import DistributedLockFactory
 
 if TYPE_CHECKING:
     from sqlalchemy.ext.asyncio import AsyncConnection as SAConnection
@@ -169,6 +174,7 @@ class RemainingTimeType(str, enum.Enum):
 
 
 class IdleCheckerHost:
+    timer: AbstractGlobalTimer
     check_interval: ClassVar[float] = DEFAULT_CHECK_INTERVAL
 
     def __init__(
@@ -177,6 +183,7 @@ def __init__(
         shared_config: SharedConfig,
         event_dispatcher: EventDispatcher,
         event_producer: EventProducer,
+        raft_ctx: RaftClusterContext,
         lock_factory: DistributedLockFactory,
     ) -> None:
         self._checkers: list[BaseIdleChecker] = []
@@ -199,6 +206,7 @@ def __init__(
         self._grace_period_checker: NewUserGracePeriodChecker = NewUserGracePeriodChecker(
             event_dispatcher, self._redis_live, self._redis_stat
         )
+        self.raft_ctx = raft_ctx
 
     def add_checker(self, checker: BaseIdleChecker):
         if self._frozen:
@@ -218,13 +226,22 @@ async def start(self) -> None:
         )
         for checker in self._checkers:
             await checker.populate_config(raw_config.get(checker.name) or {})
-        self.timer = GlobalTimer(
-            self._lock_factory(LockID.LOCKID_IDLE_CHECK_TIMER, self.check_interval),
-            self._event_producer,
-            lambda: DoIdleCheckEvent(),
-            self.check_interval,
-            task_name="idle_checker",
-        )
+
+        if self.raft_ctx.use_raft():
+            self.timer = RaftGlobalTimer(
+                self.raft_ctx.raft_node,
+                self._event_producer,
+                lambda: DoIdleCheckEvent(),
+                self.check_interval,
+            )
+        else:
+            self.timer = DistributedLockGlobalTimer(
+                self._lock_factory(LockID.LOCKID_IDLE_CHECK_TIMER, self.check_interval),
+                self._event_producer,
+                lambda: DoIdleCheckEvent(),
+                self.check_interval,
+            )
+
         self._evh_idle_check = self._event_dispatcher.consume(
             DoIdleCheckEvent,
             None,
@@ -858,7 +875,7 @@ async def check_idleness(
         if (window_size <= 0) or (math.isinf(window_size) and window_size > 0):
             return True
 
-        # Wait until the time "interval" is passed after the last udpated time.
+        # Wait until the time "interval" is passed after the last updated time.
         t = await redis_helper.execute(self._redis_live, lambda r: r.time())
         util_now: float = t[0] + (t[1] / (10**6))
         raw_util_last_collected = await redis_helper.execute(
@@ -1060,6 +1077,7 @@ async def init_idle_checkers(
     shared_config: SharedConfig,
     event_dispatcher: EventDispatcher,
     event_producer: EventProducer,
+    raft_ctx: RaftClusterContext,
     lock_factory: DistributedLockFactory,
 ) -> IdleCheckerHost:
     """
@@ -1071,6 +1089,7 @@ async def init_idle_checkers(
         shared_config,
         event_dispatcher,
         event_producer,
+        raft_ctx,
         lock_factory,
     )
     checker_init_args = (event_dispatcher, checker_host._redis_live, checker_host._redis_stat)
diff --git a/src/ai/backend/manager/raft/BUILD b/src/ai/backend/manager/raft/BUILD
new file mode 100644
index 00000000000..73574424040
--- /dev/null
+++ b/src/ai/backend/manager/raft/BUILD
@@ -0,0 +1 @@
+python_sources(name="src")
diff --git a/src/ai/backend/manager/raft/__init__.py b/src/ai/backend/manager/raft/__init__.py
new file mode 100644
index 00000000000..f4a5581f6ca
--- /dev/null
+++ b/src/ai/backend/manager/raft/__init__.py
@@ -0,0 +1,19 @@
+from raftify.cli import AbstractCLIContext
+
+# Usage:
+#   raftify-cli bootstrap-cluster --module-name='ai.backend.manager.raft'
+
+
+# TODO: Implement this. Maybe ProcessExecutor should be used for accomplishing this.
+class RaftifyCLIContext(AbstractCLIContext):
+    async def bootstrap_cluster(self, args, options):
+        pass
+
+    async def bootstrap_follower(self, args, options):
+        pass
+
+    async def add_member(self, args, options):
+        pass
+
+    async def remove_member(self, args, options):
+        pass
diff --git a/src/ai/backend/manager/raft/logger.py b/src/ai/backend/manager/raft/logger.py
new file mode 100644
index 00000000000..ff5c78b5ccd
--- /dev/null
+++ b/src/ai/backend/manager/raft/logger.py
@@ -0,0 +1,71 @@
+import logging
+import os
+from typing import Optional
+
+from raftify import AbstractRaftifyLogger
+from rraft import Logger
+
+from ai.backend.manager.types import RaftLogLovel, RaftSlogLovel
+
+
+# Temporary logger for integration testing.
+def setup_slog(level: Optional[RaftSlogLovel], log_path: str):
+    # Set up rraft-py's slog log-level to Debug.
+    # TODO: This method should be improved in rraft-py.
+    if level:
+        os.environ["RUST_LOG"] = level
+    return Logger.new_file_logger(
+        log_path, chan_size=1024, rotate_size=1024 * 1024 * 1024, rotate_keep=3
+    )
+
+
+class RaftifyLogger(AbstractRaftifyLogger):
+    _log: Optional[logging.Logger] = None
+
+    def __init__(self, log_level: Optional[RaftLogLovel]):
+        if log_level:
+            self._log = logging.getLogger("ai.backend.manager.scheduler")
+            self.log_level = log_level
+
+    def _should_log(self, level: RaftLogLovel) -> bool:
+        if not self._log:
+            return False
+
+        level_order = [
+            RaftLogLovel.TRACE,
+            RaftLogLovel.DEBUG,
+            RaftLogLovel.INFO,
+            RaftLogLovel.ERROR,
+            RaftLogLovel.CRIT,
+        ]
+        return level_order.index(self.log_level) <= level_order.index(level)
+
+    def info(self, message: str, *args, **kwargs):
+        if self._should_log(RaftLogLovel.INFO):
+            assert self._log is not None
+            self._log.info(message, *args, **kwargs)
+
+    def debug(self, message: str, *args, **kwargs):
+        if self._should_log(RaftLogLovel.DEBUG):
+            assert self._log is not None
+            self._log.debug(message, *args, **kwargs)
+
+    def warning(self, message: str, *args, **kwargs):
+        if self._should_log(RaftLogLovel.INFO):
+            assert self._log is not None
+            self._log.warning(message, *args, **kwargs)
+
+    def error(self, message: str, *args, **kwargs):
+        if self._should_log(RaftLogLovel.ERROR):
+            assert self._log is not None
+            self._log.error(message, *args, **kwargs)
+
+    def critical(self, message: str, *args, **kwargs):
+        if self._should_log(RaftLogLovel.CRIT):
+            assert self._log is not None
+            self._log.critical(message, *args, **kwargs)
+
+    def verbose(self, message: str, *args, **kwargs):
+        if self._should_log(RaftLogLovel.VERBOSE):
+            assert self._log is not None
+            self._log.debug(message, *args, **kwargs)
diff --git a/src/ai/backend/manager/raft/utils.py b/src/ai/backend/manager/raft/utils.py
new file mode 100644
index 00000000000..1a435d36fab
--- /dev/null
+++ b/src/ai/backend/manager/raft/utils.py
@@ -0,0 +1,114 @@
+import json
+import pickle
+from typing import Any, cast
+
+from aiohttp import web
+from aiohttp.web import RouteTableDef
+from raftify.log_entry.set_command import SetCommand
+from raftify.raft_facade import RaftFacade
+from raftify.state_machine.hashstore import HashStore
+
+routes = RouteTableDef()
+"""
+APIs of the web servers to interact with the RaftServers.
+"""
+
+
+@routes.get("/get/{id}")
+async def get(request: web.Request) -> web.Response:
+    raft_facade: RaftFacade = request.app["state"]["raft"]
+    store = cast(HashStore, raft_facade.store)
+    id = request.match_info["id"]
+    return web.Response(text=store.get(id))
+
+
+@routes.get("/all")
+async def all(request: web.Request) -> web.Response:
+    raft_facade: RaftFacade = request.app["state"]["raft"]
+    store = cast(HashStore, raft_facade.store)
+    return web.Response(text=json.dumps(store.as_dict()))
+
+
+@routes.get("/put/{id}/{value}")
+async def put(request: web.Request) -> web.Response:
+    raft_facade: RaftFacade = request.app["state"]["raft"]
+    id, value = request.match_info["id"], request.match_info["value"]
+    message = SetCommand(id, value)
+
+    result = await raft_facade.mailbox.send_proposal(message.encode())
+    return web.Response(text=f'"{str(pickle.loads(result))}"')
+
+
+@routes.get("/leave")
+async def leave(request: web.Request) -> web.Response:
+    raft_facade: RaftFacade = request.app["state"]["raft"]
+    id = raft_facade.raft_node.get_id()
+    addr = raft_facade.peers[id].addr
+    await raft_facade.mailbox.leave(id, addr)
+    return web.Response(text=f'Removed "node {id}" from the cluster successfully.')
+
+
+@routes.get("/remove/{id}")
+async def remove(request: web.Request) -> web.Response:
+    cluster: RaftFacade = request.app["state"]["raft"]
+    id = int(request.match_info["id"])
+    addr = cluster.peers[id].addr
+    await cluster.mailbox.leave(id, addr)
+    return web.Response(text=f'Removed "node {id}" from the cluster successfully.')
+
+
+@routes.get("/peers")
+async def peers(request: web.Request) -> web.Response:
+    raft_facade: RaftFacade = request.app["state"]["raft"]
+    return web.Response(text=str(raft_facade.peers))
+
+
+@routes.get("/leader")
+async def leader(request: web.Request) -> web.Response:
+    raft_facade: RaftFacade = request.app["state"]["raft"]
+    return web.Response(text=str(raft_facade.raft_node.get_leader_id()))
+
+
+@routes.get("/transfer/{id}")
+async def transfer_leader(request: web.Request) -> web.Response:
+    raft_facade: RaftFacade = request.app["state"]["raft"]
+    target_node_id = int(request.match_info["id"])
+
+    raft_facade.raft_node.transfer_leader(target_node_id)
+    return web.Response(text="Leader transferred successfully.")
+
+
+@routes.get("/snapshot")
+async def snapshot(request: web.Request) -> web.Response:
+    raft_facade: RaftFacade = request.app["state"]["raft"]
+
+    await raft_facade.create_snapshot()
+    return web.Response(text="Created snapshot successfully.")
+
+
+@routes.get("/unstable")
+async def unstable(request: web.Request) -> web.Response:
+    raft_facade: RaftFacade = request.app["state"]["raft"]
+    return web.Response(
+        text=str(raft_facade.raft_node.raw_node.get_raft().get_raft_log().unstable())
+    )
+
+
+class WebServer:
+    """
+    Simple webserver for Raft cluster testing.
+    Do not use this class for anything other than testing purposes.
+    """
+
+    def __init__(self, addr: str, state: dict[str, Any]):
+        self.app = web.Application()
+        self.app.add_routes(routes)
+        self.app["state"] = state
+        self.host, self.port = addr.split(":")
+        self.runner = None
+
+    async def run(self):
+        self.runner = web.AppRunner(self.app)
+        await self.runner.setup()
+        self.site = web.TCPSite(self.runner, self.host, self.port)
+        await self.site.start()
diff --git a/src/ai/backend/manager/scheduler/dispatcher.py b/src/ai/backend/manager/scheduler/dispatcher.py
index ada81692dbf..4d520a7f3e3 100644
--- a/src/ai/backend/manager/scheduler/dispatcher.py
+++ b/src/ai/backend/manager/scheduler/dispatcher.py
@@ -33,7 +33,11 @@
 
 from ai.backend.common import redis_helper
 from ai.backend.common.defs import REDIS_LIVE_DB
-from ai.backend.common.distributed import GlobalTimer
+from ai.backend.common.distributed import (
+    AbstractGlobalTimer,
+    DistributedLockGlobalTimer,
+    RaftGlobalTimer,
+)
 from ai.backend.common.events import (
     AgentStartedEvent,
     CoalescingOptions,
@@ -61,15 +65,16 @@
     SessionId,
     aobject,
 )
+from ai.backend.manager.api.context import RaftClusterContext
+from ai.backend.manager.defs import SERVICE_MAX_RETRIES, LockID
+from ai.backend.manager.models.agent import AgentRow
 from ai.backend.manager.models.session import _build_session_fetch_query
 from ai.backend.manager.types import DistributedLockFactory
 from ai.backend.plugin.entrypoint import scan_entrypoints
 
 from ..api.exceptions import GenericBadRequest, InstanceNotAvailable, SessionNotFound
-from ..defs import SERVICE_MAX_RETRIES, LockID
 from ..exceptions import convert_to_status_data
 from ..models import (
-    AgentRow,
     AgentStatus,
     EndpointLifecycle,
     EndpointRow,
@@ -148,21 +153,22 @@ def load_scheduler(
 
 
 class SchedulerDispatcher(aobject):
-    config: LocalConfig
+    local_config: LocalConfig
     shared_config: SharedConfig
     registry: AgentRegistry
     db: SAEngine
 
     event_dispatcher: EventDispatcher
     event_producer: EventProducer
-    schedule_timer: GlobalTimer
-    prepare_timer: GlobalTimer
-    scale_timer: GlobalTimer
+    schedule_timer: AbstractGlobalTimer
+    prepare_timer: AbstractGlobalTimer
+    scale_timer: AbstractGlobalTimer
 
     redis_live: RedisConnectionInfo
 
     def __init__(
         self,
+        raft_ctx: RaftClusterContext,
         local_config: LocalConfig,
         shared_config: SharedConfig,
         event_dispatcher: EventDispatcher,
@@ -170,6 +176,7 @@ def __init__(
         lock_factory: DistributedLockFactory,
         registry: AgentRegistry,
     ) -> None:
+        self.raft_ctx = raft_ctx
         self.local_config = local_config
         self.shared_config = shared_config
         self.event_dispatcher = event_dispatcher
@@ -200,32 +207,54 @@ async def __ainit__(self) -> None:
         evd.consume(DoScheduleEvent, None, self.schedule, coalescing_opts)
         evd.consume(DoPrepareEvent, None, self.prepare)
         evd.consume(DoScaleEvent, None, self.scale_services)
-        self.schedule_timer = GlobalTimer(
-            self.lock_factory(LockID.LOCKID_SCHEDULE_TIMER, 10.0),
-            self.event_producer,
-            lambda: DoScheduleEvent(),
-            interval=10.0,
-            task_name="schedule_timer",
-        )
-        self.prepare_timer = GlobalTimer(
-            self.lock_factory(LockID.LOCKID_PREPARE_TIMER, 10.0),
-            self.event_producer,
-            lambda: DoPrepareEvent(),
-            interval=10.0,
-            initial_delay=5.0,
-            task_name="prepare_timer",
-        )
-        self.scale_timer = GlobalTimer(
-            self.lock_factory(LockID.LOCKID_SCALE_TIMER, 10.0),
-            self.event_producer,
-            lambda: DoScaleEvent(),
-            interval=10.0,
-            initial_delay=7.0,
-            task_name="scale_timer",
-        )
+
+        if self.raft_ctx.use_raft():
+            self.schedule_timer = RaftGlobalTimer(
+                self.raft_ctx.raft_node,
+                self.event_producer,
+                lambda: DoScheduleEvent(),
+                interval=10.0,
+            )
+            self.prepare_timer = RaftGlobalTimer(
+                self.raft_ctx.raft_node,
+                self.event_producer,
+                lambda: DoPrepareEvent(),
+                interval=10.0,
+                initial_delay=5.0,
+            )
+            self.scale_timer = RaftGlobalTimer(
+                self.raft_ctx.raft_node,
+                self.event_producer,
+                lambda: DoScaleEvent(),
+                interval=10.0,
+                initial_delay=7.0,
+            )
+        else:
+            self.schedule_timer = DistributedLockGlobalTimer(
+                self.lock_factory(LockID.LOCKID_SCHEDULE_TIMER, 10.0),
+                self.event_producer,
+                lambda: DoScheduleEvent(),
+                interval=10.0,
+            )
+            self.prepare_timer = DistributedLockGlobalTimer(
+                self.lock_factory(LockID.LOCKID_PREPARE_TIMER, 10.0),
+                self.event_producer,
+                lambda: DoPrepareEvent(),
+                interval=10.0,
+                initial_delay=5.0,
+            )
+            self.scale_timer = DistributedLockGlobalTimer(
+                self.lock_factory(LockID.LOCKID_SCALE_TIMER, 10.0),
+                self.event_producer,
+                lambda: DoScaleEvent(),
+                interval=10.0,
+                initial_delay=7.0,
+            )
+
         await self.schedule_timer.join()
         await self.prepare_timer.join()
         await self.scale_timer.join()
+
         log.info("Session scheduler started")
 
     async def close(self) -> None:
@@ -233,7 +262,6 @@ async def close(self) -> None:
             tg.create_task(self.scale_timer.leave())
             tg.create_task(self.prepare_timer.leave())
             tg.create_task(self.schedule_timer.leave())
-        await self.redis_live.close()
         log.info("Session scheduler stopped")
 
     async def schedule(
@@ -279,52 +307,33 @@ def _pipeline(r: Redis) -> RedisPipeline:
         )
 
         try:
-            # The schedule() method should be executed with a global lock
-            # as its individual steps are composed of many short-lived transactions.
-            async with self.lock_factory(LockID.LOCKID_SCHEDULE, 60):
-                async with self.db.begin_readonly_session() as db_sess:
-                    # query = (
-                    #     sa.select(ScalingGroupRow)
-                    #     .join(ScalingGroupRow.agents.and_(AgentRow.status == AgentStatus.ALIVE))
-                    # )
-                    query = (
-                        sa.select(AgentRow.scaling_group)
-                        .where(AgentRow.status == AgentStatus.ALIVE)
-                        .group_by(AgentRow.scaling_group)
-                    )
-                    result = await db_sess.execute(query)
-                    schedulable_scaling_groups = [row.scaling_group for row in result.fetchall()]
-                for sgroup_name in schedulable_scaling_groups:
-                    try:
-                        await self._schedule_in_sgroup(
-                            sched_ctx,
-                            sgroup_name,
-                        )
-                        await redis_helper.execute(
-                            self.redis_live,
-                            lambda r: r.hset(
-                                redis_key,
-                                "resource_group",
-                                sgroup_name,
-                            ),
-                        )
-                    except InstanceNotAvailable as e:
-                        # Proceed to the next scaling group and come back later.
-                        log.debug(
-                            "schedule({}): instance not available ({})",
-                            sgroup_name,
-                            e.extra_msg,
-                        )
-                    except Exception as e:
-                        log.exception("schedule({}): scheduling error!\n{}", sgroup_name, repr(e))
-                await redis_helper.execute(
-                    self.redis_live,
-                    lambda r: r.hset(
-                        redis_key,
-                        "finish_time",
-                        datetime.now(tzutc()).isoformat(),
-                    ),
+            async with self.db.begin_readonly_session() as db_sess:
+                # query = (
+                #     sa.select(ScalingGroupRow)
+                #     .join(ScalingGroupRow.agents.and_(AgentRow.status == AgentStatus.ALIVE))
+                # )
+                query = (
+                    sa.select(AgentRow.scaling_group)
+                    .where(AgentRow.status == AgentStatus.ALIVE)
+                    .group_by(AgentRow.scaling_group)
                 )
+                result = await db_sess.execute(query)
+                schedulable_scaling_groups = [row.scaling_group for row in result.fetchall()]
+            for sgroup_name in schedulable_scaling_groups:
+                try:
+                    await self._schedule_in_sgroup(
+                        sched_ctx,
+                        sgroup_name,
+                    )
+                except InstanceNotAvailable as e:
+                    # Proceed to the next scaling group and come back later.
+                    log.debug(
+                        "schedule({}): instance not available ({})",
+                        sgroup_name,
+                        e.extra_msg,
+                    )
+                except Exception as e:
+                    log.exception("schedule({}): scheduling error!\n{}", sgroup_name, repr(e))
         except DBAPIError as e:
             if getattr(e.orig, "pgcode", None) == "55P03":
                 log.info(
@@ -713,6 +722,7 @@ async def _schedule_single_node_session(
         log_fmt = _log_fmt.get("")
         log_args = _log_args.get(tuple())
         requested_architectures = set(k.architecture for k in sess_ctx.kernels)
+
         if len(requested_architectures) > 1:
             raise GenericBadRequest(
                 "Cannot assign multiple kernels with different architectures' single node session",
@@ -1233,91 +1243,90 @@ def _pipeline(r: Redis) -> RedisPipeline:
             known_slot_types,
         )
         try:
-            async with self.lock_factory(LockID.LOCKID_PREPARE, 600):
-                now = datetime.now(tzutc())
+            now = datetime.now(tzutc())
 
-                async def _mark_session_preparing() -> Sequence[SessionRow]:
-                    async with self.db.begin_session() as db_sess:
-                        update_query = (
-                            sa.update(KernelRow)
-                            .values(
-                                status=KernelStatus.PREPARING,
-                                status_changed=now,
-                                status_info="",
-                                status_data={},
-                                status_history=sql_json_merge(
-                                    KernelRow.status_history,
-                                    (),
-                                    {
-                                        KernelStatus.PREPARING.name: now.isoformat(),
-                                    },
-                                ),
-                            )
-                            .where(
-                                (KernelRow.status == KernelStatus.SCHEDULED),
-                            )
-                        )
-                        await db_sess.execute(update_query)
-                        update_sess_query = (
-                            sa.update(SessionRow)
-                            .values(
-                                status=SessionStatus.PREPARING,
-                                # status_changed=now,
-                                status_info="",
-                                status_data={},
-                                status_history=sql_json_merge(
-                                    SessionRow.status_history,
-                                    (),
-                                    {
-                                        SessionStatus.PREPARING.name: now.isoformat(),
-                                    },
-                                ),
-                            )
-                            .where(SessionRow.status == SessionStatus.SCHEDULED)
-                            .returning(SessionRow.id)
+            async def _mark_session_preparing() -> Sequence[SessionRow]:
+                async with self.db.begin_session() as db_sess:
+                    update_query = (
+                        sa.update(KernelRow)
+                        .values(
+                            status=KernelStatus.PREPARING,
+                            status_changed=now,
+                            status_info="",
+                            status_data={},
+                            status_history=sql_json_merge(
+                                KernelRow.status_history,
+                                (),
+                                {
+                                    KernelStatus.PREPARING.name: now.isoformat(),
+                                },
+                            ),
                         )
-                        rows = (await db_sess.execute(update_sess_query)).fetchall()
-                        if len(rows) == 0:
-                            return []
-                        target_session_ids = [r["id"] for r in rows]
-                        select_query = (
-                            sa.select(SessionRow)
-                            .where(SessionRow.id.in_(target_session_ids))
-                            .options(
-                                noload("*"),
-                                selectinload(SessionRow.kernels).noload("*"),
-                            )
+                        .where(
+                            (KernelRow.status == KernelStatus.SCHEDULED),
                         )
-                        result = await db_sess.execute(select_query)
-                        return result.scalars().all()
-
-                scheduled_sessions: Sequence[SessionRow]
-                scheduled_sessions = await execute_with_retry(_mark_session_preparing)
-                log.debug("prepare(): preparing {} session(s)", len(scheduled_sessions))
-                async with (
-                    async_timeout.timeout(delay=50.0),
-                    aiotools.PersistentTaskGroup() as tg,
-                ):
-                    for scheduled_session in scheduled_sessions:
-                        await self.registry.event_producer.produce_event(
-                            SessionPreparingEvent(
-                                scheduled_session.id,
-                                scheduled_session.creation_id,
+                    )
+                    await db_sess.execute(update_query)
+                    update_sess_query = (
+                        sa.update(SessionRow)
+                        .values(
+                            status=SessionStatus.PREPARING,
+                            # status_changed=now,
+                            status_info="",
+                            status_data={},
+                            status_history=sql_json_merge(
+                                SessionRow.status_history,
+                                (),
+                                {
+                                    SessionStatus.PREPARING.name: now.isoformat(),
+                                },
                             ),
                         )
-                        tg.create_task(
-                            self.start_session(
-                                sched_ctx,
-                                scheduled_session,
-                            )
+                        .where(SessionRow.status == SessionStatus.SCHEDULED)
+                        .returning(SessionRow.id)
+                    )
+                    rows = (await db_sess.execute(update_sess_query)).fetchall()
+                    if len(rows) == 0:
+                        return []
+                    target_session_ids = [r["id"] for r in rows]
+                    select_query = (
+                        sa.select(SessionRow)
+                        .where(SessionRow.id.in_(target_session_ids))
+                        .options(
+                            noload("*"),
+                            selectinload(SessionRow.kernels).noload("*"),
                         )
-
-                        await redis_helper.execute(
-                            self.redis_live,
-                            lambda r: r.hset(
-                                redis_key, "resource_group", scheduled_session.scaling_group_name
-                            ),
+                    )
+                    result = await db_sess.execute(select_query)
+                    return result.scalars().all()
+
+            scheduled_sessions: Sequence[SessionRow]
+            scheduled_sessions = await execute_with_retry(_mark_session_preparing)
+            log.debug("prepare(): preparing {} session(s)", len(scheduled_sessions))
+            async with (
+                async_timeout.timeout(delay=50.0),
+                aiotools.PersistentTaskGroup() as tg,
+            ):
+                for scheduled_session in scheduled_sessions:
+                    await self.registry.event_producer.produce_event(
+                        SessionPreparingEvent(
+                            scheduled_session.id,
+                            scheduled_session.creation_id,
+                        ),
+                    )
+                    tg.create_task(
+                        self.start_session(
+                            sched_ctx,
+                            scheduled_session,
                         )
+                    )
+
+                    await redis_helper.execute(
+                        self.redis_live,
+                        lambda r: r.hset(
+                            redis_key, "resource_group", scheduled_session.scaling_group_name
+                        ),
+                    )
             await redis_helper.execute(
                 self.redis_live,
                 lambda r: r.hset(
diff --git a/src/ai/backend/manager/server.py b/src/ai/backend/manager/server.py
index cf8e1d504ec..b8920c2265b 100644
--- a/src/ai/backend/manager/server.py
+++ b/src/ai/backend/manager/server.py
@@ -18,9 +18,9 @@
     AsyncIterator,
     Final,
     Iterable,
-    List,
     Mapping,
     MutableMapping,
+    Optional,
     Sequence,
     cast,
 )
@@ -30,6 +30,15 @@
 import aiotools
 import click
 from aiohttp import web
+from aiotools import process_index
+from raftify.config import RaftifyConfig
+from raftify.peers import Peer, Peers
+from raftify.raft_client import RaftClient
+from raftify.raft_facade import RaftFacade
+from raftify.raft_utils import RequestIdResponse
+from raftify.rraft_deserializer import init_rraft_py_deserializer
+from raftify.state_machine.hashstore import HashStore
+from raftify.utils import SocketAddr
 from setproctitle import setproctitle
 
 from ai.backend.common import redis_helper
@@ -49,11 +58,13 @@
 from ai.backend.common.plugin.monitor import INCREMENT
 from ai.backend.common.types import AgentSelectionStrategy, LogSeverity
 from ai.backend.common.utils import env_info
+from ai.backend.manager.raft.logger import RaftifyLogger, setup_slog
+from ai.backend.manager.raft.utils import WebServer
 
 from . import __version__
 from .agent_cache import AgentRPCCache
 from .api import ManagerStatus
-from .api.context import RootContext
+from .api.context import RaftClusterContext, RootContext
 from .api.exceptions import (
     BackendError,
     GenericBadRequest,
@@ -413,6 +424,7 @@ async def idle_checker_ctx(root_ctx: RootContext) -> AsyncIterator[None]:
         root_ctx.shared_config,
         root_ctx.event_dispatcher,
         root_ctx.event_producer,
+        root_ctx.raft_ctx,
         root_ctx.distributed_lock_factory,
     )
     await root_ctx.idle_checker_host.start()
@@ -490,6 +502,7 @@ async def sched_dispatcher_ctx(root_ctx: RootContext) -> AsyncIterator[None]:
     from .scheduler.dispatcher import SchedulerDispatcher
 
     sched_dispatcher = await SchedulerDispatcher.new(
+        root_ctx.raft_ctx,
         root_ctx.local_config,
         root_ctx.shared_config,
         root_ctx.event_dispatcher,
@@ -636,6 +649,98 @@ async def _force_terminate_hanging_sessions(
                 await task
 
 
+def grant_type(value: Optional[str]) -> Any:
+    if value is None:
+        return None
+    try:
+        return int(value)
+    except Exception:
+        pass
+    if value.lower() == "true":
+        return True
+    if value.lower() == "false":
+        return False
+    return value
+
+
+@actxmgr
+async def raft_ctx(root_ctx: RootContext) -> AsyncIterator[None]:
+    local_config = root_ctx.local_config
+    init_rraft_py_deserializer()
+
+    raft_configs = local_config.get("raft")
+
+    if raft_configs is not None:
+        initial_peers = Peers(
+            {
+                int(peer_config["node-id"]): Peer(
+                    addr=SocketAddr(peer_config["host"], peer_config["port"])
+                )
+                for peer_config in raft_configs.pop("peers")
+            }
+        )
+
+        node_id_start = root_ctx.raft_ctx.node_id_start
+
+        raft_configs_dict = {
+            key.replace("-", "_"): grant_type(raft_configs[key]) for key in raft_configs
+        }
+
+        logger = RaftifyLogger(raft_configs_dict.get("log_level"))
+
+        raft_cfg = RaftifyConfig(
+            auto_remove_node=False,
+            log_dir=raft_configs_dict["log_dir"],
+            compacted_log_dir=raft_configs_dict["log_dir"],
+            raft_config=RaftifyConfig.new_raft_config(raft_configs_dict),
+        )
+
+        store = HashStore()
+
+        logger.info("Bootstrapping Raft cluster...")
+        node_id = node_id_start + process_index.get()
+        current_node = [peer for id, peer in initial_peers.data.items() if id == node_id][0]
+        raft_addr = current_node.addr
+
+        slog = setup_slog(
+            raft_configs_dict.get("slog_level"),
+            f"{raft_configs_dict['log_dir']}/slog-{node_id}.log",
+        )
+
+        root_ctx.raft_ctx.cluster = RaftFacade(
+            raft_cfg, raft_addr, store, slog, logger, initial_peers=initial_peers
+        )
+        raft_cluster = root_ctx.raft_ctx.cluster
+        raft_cluster.run_raft(node_id)
+
+        if node_id == 1:
+            assert not root_ctx.raft_ctx.bootstrap_done
+            asyncio.create_task(raft_cluster.wait_for_followers_join())
+        else:
+            # Wait for the leader node's grpc server ready
+            await asyncio.sleep(2)
+            leader_id = raft_configs["cluster-leader-id"]
+            leader_client = RaftClient(initial_peers[leader_id].addr)
+
+            if root_ctx.raft_ctx.bootstrap_done:
+                await raft_cluster.join_cluster(
+                    RequestIdResponse(
+                        follower_id=node_id,
+                        leader=(leader_id, leader_client),
+                        peers=initial_peers,
+                    )
+                )
+            else:
+                await raft_cluster.send_member_bootstrap_ready_msg(node_id)
+
+        asyncio.create_task(raft_cluster.wait_for_termination())
+        # Only for testing
+        asyncio.create_task(WebServer(f"127.0.0.1:6025{node_id}", {"raft": raft_cluster}).run())
+
+        assert root_ctx.raft_ctx.cluster.raft_node is not None, "RaftNode not initialized properly!"
+    yield
+
+
 class background_task_ctx:
     def __init__(self, root_ctx: RootContext) -> None:
         self.root_ctx = root_ctx
@@ -781,6 +886,7 @@ def build_root_app(
             database_ctx,
             distributed_lock_ctx,
             event_dispatcher_ctx,
+            raft_ctx,
             idle_checker_ctx,
             storage_manager_ctx,
             hook_plugin_ctx,
@@ -834,11 +940,15 @@ async def _call_cleanup_context_shutdown_handlers(app: web.Application) -> None:
 async def server_main(
     loop: asyncio.AbstractEventLoop,
     pidx: int,
-    _args: List[Any],
+    _args: list[Any],
 ) -> AsyncIterator[None]:
     root_app = build_root_app(pidx, _args[0], subapp_pkgs=global_subapp_pkgs)
     root_ctx: RootContext = root_app["_root.context"]
 
+    bootstrap_done = _args[2]
+    node_id_start = _args[3]
+    root_ctx.raft_ctx = RaftClusterContext(bootstrap_done, node_id_start)
+
     # Start aiomonitor.
     # Port is set by config (default=50100 + pidx).
     loop.set_debug(root_ctx.local_config["debug"]["asyncio"])
@@ -913,9 +1023,10 @@ async def server_main(
 async def server_main_logwrapper(
     loop: asyncio.AbstractEventLoop,
     pidx: int,
-    _args: List[Any],
+    _args: list[Any],
 ) -> AsyncIterator[None]:
     setproctitle(f"backend.ai: manager worker-{pidx}")
+
     log_endpoint = _args[1]
     logger = Logger(_args[0]["logging"], is_master=False, log_endpoint=log_endpoint)
     try:
@@ -946,13 +1057,40 @@ async def server_main_logwrapper(
     default="INFO",
     help="Set the logging verbosity level",
 )
+@click.option(
+    "--bootstrap-done",
+    type=bool,
+    is_flag=True,
+    default=False,
+    help=(
+        "This would be useful when adding the "
+        "RaftNode to an existing cluster without restarting the server."
+    ),
+)
+# TODO: Find better way to implement this.
+@click.option(
+    "--node-id-start",
+    type=int,
+    default=1,
+    help="Set this to the max(node_ids) + 1 when joining a RaftNode to another cluster.",
+)
 @click.pass_context
-def main(ctx: click.Context, config_path: Path, log_level: str, debug: bool = False) -> None:
+def main(
+    ctx: click.Context,
+    config_path: Path,
+    log_level: str,
+    debug: bool = False,
+    bootstrap_done: bool = False,
+    node_id_start: int = 1,
+) -> None:
     """
     Start the manager service as a foreground process.
     """
     cfg = load_config(config_path, "DEBUG" if debug else log_level)
 
+    if bootstrap_done and node_id_start == 1:
+        raise click.UsageError("--node-id-start must be provided when --bootstrap-done is True.")
+
     if ctx.invoked_subcommand is None:
         cfg["manager"]["pid-file"].write_text(str(os.getpid()))
         ipc_base_path = cfg["manager"]["ipc-base-path"]
@@ -976,7 +1114,7 @@ def main(ctx: click.Context, config_path: Path, log_level: str, debug: bool = Fa
                     aiotools.start_server(
                         server_main_logwrapper,
                         num_workers=cfg["manager"]["num-proc"],
-                        args=(cfg, log_endpoint),
+                        args=(cfg, log_endpoint, bootstrap_done, node_id_start),
                         wait_timeout=5.0,
                     )
                 finally:
diff --git a/src/ai/backend/manager/types.py b/src/ai/backend/manager/types.py
index 7d413594deb..914c4579c96 100644
--- a/src/ai/backend/manager/types.py
+++ b/src/ai/backend/manager/types.py
@@ -41,3 +41,20 @@ class UserScope:
 
 class DistributedLockFactory(Protocol):
     def __call__(self, lock_id: LockID, lifetime_hint: float) -> AbstractDistributedLock: ...
+
+
+class RaftSlogLovel(str, enum.Enum):
+    INFO = "info"
+    TRACE = "trace"
+    DEBUG = "debug"
+    CRIT = "crit"
+    ERROR = "error"
+
+
+class RaftLogLovel(str, enum.Enum):
+    INFO = "info"
+    TRACE = "trace"
+    DEBUG = "debug"
+    CRIT = "crit"
+    ERROR = "error"
+    VERBOSE = "verbose"
diff --git a/tests/common/test_distributed.py b/tests/common/test_distributed.py
index c4cc6e558d6..59cc56fa0d7 100644
--- a/tests/common/test_distributed.py
+++ b/tests/common/test_distributed.py
@@ -18,7 +18,7 @@
 from redis.asyncio import Redis
 
 from ai.backend.common import config
-from ai.backend.common.distributed import GlobalTimer
+from ai.backend.common.distributed import DistributedLockGlobalTimer
 from ai.backend.common.etcd import AsyncEtcd, ConfigScopes
 from ai.backend.common.events import AbstractEvent, EventDispatcher, EventProducer
 from ai.backend.common.lock import AbstractDistributedLock, EtcdLock, FileLock, RedisLock
@@ -98,7 +98,7 @@ async def _tick(context: Any, source: AgentId, event: NoopEvent) -> None:
     )
     event_dispatcher.consume(NoopEvent, None, _tick)
 
-    timer = GlobalTimer(
+    timer = DistributedLockGlobalTimer(
         lock_factory(),
         event_producer,
         lambda: NoopEvent(test_case_ns),
@@ -150,7 +150,7 @@ async def _tick(context: Any, source: AgentId, event: NoopEvent) -> None:
                 ConfigScopes.NODE: "node/i-test",
             },
         )
-        timer = GlobalTimer(
+        timer = DistributedLockGlobalTimer(
             EtcdLock(etcd_ctx.lock_name, etcd, timeout=None, debug=True),
             event_producer,
             lambda: NoopEvent(timer_ctx.test_case_ns),
@@ -207,7 +207,7 @@ async def _tick(context: Any, source: AgentId, event: NoopEvent) -> None:
         )
         event_dispatcher.consume(NoopEvent, None, _tick)
 
-        timer = GlobalTimer(
+        timer = DistributedLockGlobalTimer(
             self.lock_factory(),
             event_producer,
             lambda: NoopEvent(self.test_case_ns),
@@ -398,7 +398,7 @@ async def _tick(context: Any, source: AgentId, event: NoopEvent) -> None:
     lock_path = Path(tempfile.gettempdir()) / f"{test_case_ns}.lock"
     request.addfinalizer(partial(lock_path.unlink, missing_ok=True))
     for _ in range(10):
-        timer = GlobalTimer(
+        timer = DistributedLockGlobalTimer(
             FileLock(lock_path, timeout=0, debug=True),
             event_producer,
             lambda: NoopEvent(test_case_ns),
diff --git a/tests/manager/test_idle_checker.py b/tests/manager/test_idle_checker.py
index 2174ebd981c..7f9eb214e67 100644
--- a/tests/manager/test_idle_checker.py
+++ b/tests/manager/test_idle_checker.py
@@ -7,7 +7,7 @@
 
 from ai.backend.common import msgpack, redis_helper
 from ai.backend.common.types import KernelId, SessionId, SessionTypes
-from ai.backend.manager.api.context import RootContext
+from ai.backend.manager.api.context import RaftClusterContext, RootContext
 from ai.backend.manager.idle import (
     BaseIdleChecker,
     IdleCheckerHost,
@@ -97,6 +97,7 @@ async def new_user_grace_period_checker(
         [".etcd"],
     )
     root_ctx: RootContext = test_app["_root.context"]
+    root_ctx.raft_ctx = RaftClusterContext()
 
     # test config
     grace_period = 30
@@ -116,6 +117,7 @@ async def new_user_grace_period_checker(
         root_ctx.shared_config,
         root_ctx.event_dispatcher,
         root_ctx.event_producer,
+        root_ctx.raft_ctx,
         root_ctx.distributed_lock_factory,
     )
     try:
@@ -146,6 +148,7 @@ async def network_timeout_idle_checker(
         [".etcd"],
     )
     root_ctx: RootContext = test_app["_root.context"]
+    root_ctx.raft_ctx = RaftClusterContext()
 
     # test 1
     # remaining time is positive and no grace period
@@ -177,6 +180,7 @@ async def network_timeout_idle_checker(
         root_ctx.shared_config,
         root_ctx.event_dispatcher,
         root_ctx.event_producer,
+        root_ctx.raft_ctx,
         root_ctx.distributed_lock_factory,
     )
     try:
@@ -230,6 +234,7 @@ async def network_timeout_idle_checker(
         root_ctx.shared_config,
         root_ctx.event_dispatcher,
         root_ctx.event_producer,
+        root_ctx.raft_ctx,
         root_ctx.distributed_lock_factory,
     )
     try:
@@ -287,6 +292,7 @@ async def network_timeout_idle_checker(
         root_ctx.shared_config,
         root_ctx.event_dispatcher,
         root_ctx.event_producer,
+        root_ctx.raft_ctx,
         root_ctx.distributed_lock_factory,
     )
     try:
@@ -349,6 +355,7 @@ async def network_timeout_idle_checker(
         root_ctx.shared_config,
         root_ctx.event_dispatcher,
         root_ctx.event_producer,
+        root_ctx.raft_ctx,
         root_ctx.distributed_lock_factory,
     )
     try:
@@ -397,6 +404,7 @@ async def session_lifetime_checker(
         [".etcd"],
     )
     root_ctx: RootContext = test_app["_root.context"]
+    root_ctx.raft_ctx = RaftClusterContext()
 
     # test 1
     # remaining time is positive and no grace period
@@ -424,6 +432,7 @@ async def session_lifetime_checker(
         root_ctx.shared_config,
         root_ctx.event_dispatcher,
         root_ctx.event_producer,
+        root_ctx.raft_ctx,
         root_ctx.distributed_lock_factory,
     )
     try:
@@ -471,6 +480,7 @@ async def session_lifetime_checker(
         root_ctx.shared_config,
         root_ctx.event_dispatcher,
         root_ctx.event_producer,
+        root_ctx.raft_ctx,
         root_ctx.distributed_lock_factory,
     )
     try:
@@ -523,6 +533,7 @@ async def session_lifetime_checker(
         root_ctx.shared_config,
         root_ctx.event_dispatcher,
         root_ctx.event_producer,
+        root_ctx.raft_ctx,
         root_ctx.distributed_lock_factory,
     )
     try:
@@ -577,6 +588,7 @@ async def session_lifetime_checker(
         root_ctx.shared_config,
         root_ctx.event_dispatcher,
         root_ctx.event_producer,
+        root_ctx.raft_ctx,
         root_ctx.distributed_lock_factory,
     )
     try:
@@ -620,6 +632,7 @@ async def utilization_idle_checker__utilization(
         [".etcd"],
     )
     root_ctx: RootContext = test_app["_root.context"]
+    root_ctx.raft_ctx = RaftClusterContext()
 
     kernel_id = KernelId(uuid4())
     expected = {
@@ -665,6 +678,7 @@ async def utilization_idle_checker__utilization(
         root_ctx.shared_config,
         root_ctx.event_dispatcher,
         root_ctx.event_producer,
+        root_ctx.raft_ctx,
         root_ctx.distributed_lock_factory,
     )
     await redis_helper.execute(
@@ -704,6 +718,7 @@ async def utilization_idle_checker(
         [".etcd"],
     )
     root_ctx: RootContext = test_app["_root.context"]
+    root_ctx.raft_ctx = RaftClusterContext()
 
     # test 1
     # remaining time is positive and no utilization.
@@ -764,6 +779,7 @@ async def utilization_idle_checker(
         root_ctx.shared_config,
         root_ctx.event_dispatcher,
         root_ctx.event_producer,
+        root_ctx.raft_ctx,
         root_ctx.distributed_lock_factory,
     )
     await redis_helper.execute(
@@ -846,6 +862,7 @@ async def utilization_idle_checker(
         root_ctx.shared_config,
         root_ctx.event_dispatcher,
         root_ctx.event_producer,
+        root_ctx.raft_ctx,
         root_ctx.distributed_lock_factory,
     )
     await redis_helper.execute(
@@ -928,6 +945,7 @@ async def utilization_idle_checker(
         root_ctx.shared_config,
         root_ctx.event_dispatcher,
         root_ctx.event_producer,
+        root_ctx.raft_ctx,
         root_ctx.distributed_lock_factory,
     )
     await redis_helper.execute(
diff --git a/tests/manager/test_scheduler.py b/tests/manager/test_scheduler.py
index 2bd8e4c4f68..d020cc8a774 100644
--- a/tests/manager/test_scheduler.py
+++ b/tests/manager/test_scheduler.py
@@ -26,6 +26,7 @@
     SessionId,
     SessionTypes,
 )
+from ai.backend.manager.api.context import RaftClusterContext
 from ai.backend.manager.defs import DEFAULT_ROLE
 from ai.backend.manager.models.agent import AgentRow
 from ai.backend.manager.models.image import ImageRow
@@ -1169,6 +1170,7 @@ async def test_manually_assign_agent_available(
     candidate_agents = example_agents
     example_pending_sessions[0].kernels[0].agent = example_agents[0].id
     sess_ctx = example_pending_sessions[0]
+    raft_ctx = RaftClusterContext()
 
     dispatcher = SchedulerDispatcher(
         local_config=mock_local_config,
@@ -1176,6 +1178,7 @@ async def test_manually_assign_agent_available(
         event_dispatcher=mock_event_dispatcher,
         event_producer=mock_event_producer,
         lock_factory=file_lock_factory,
+        raft_ctx=raft_ctx,
         registry=registry,
     )