added bft_raft_tutorial

Signed-off-by: Koushik Gavini <koushikgavini@koushiks-mbp.jerboa-altered.ts.net>

docs/source/tutorial/bft_raft_migration_tutorial.md

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+# Operational Runbook: Migrating from Raft to BFT in Hyperledger Fabric
+
+## Prerequisites
+
+- A running Fabric network with Raft consensus
+- Administrative access to the ordering service
+- Fabric version 3.0.0 or higher on all nodes
+- Backup of the current system
+
+## Step 1: Prepare the Environment
+
+```bash
+export FABRIC_CFG_PATH=$PWD/config
+export ORDERER_CA=/opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem
+export CHANNEL_NAME=mychannel
+```
+
+## Step 2: Verify Current Consensus Type and Consenter Mapping
+
+```bash
+peer channel fetch config config_block.pb -o orderer.example.com:7050 -c $CHANNEL_NAME --tls --cafile $ORDERER_CA
+
+configtxlator proto_decode --input config_block.pb --type common.Block | jq .data.data[0].payload.data.config > current_config.json
+
+# Check current consensus type
+jq '.channel_group.groups.Orderer.values.ConsensusType.value.type' current_config.json
+
+# Check current consenter mapping
+jq '.channel_group.groups.Orderer.values.Orderers.value.consenter_mapping' current_config.json
+```
+
+## Step 3: Enter Maintenance Mode
+
+```bash
+cp current_config.json modified_config.json
+
+jq '.channel_group.groups.Orderer.values.ConsensusType.value.state = "STATE_MAINTENANCE"' modified_config.json > updated_config.json
+
+configtxlator proto_encode --input current_config.json --type common.Config --output current_config.pb
+configtxlator proto_encode --input updated_config.json --type common.Config --output updated_config.pb
+configtxlator compute_update --channel_id $CHANNEL_NAME --original current_config.pb --updated updated_config.pb --output config_update.pb
+
+peer channel signconfigtx -f config_update.pb
+peer channel update -f config_update.pb -c $CHANNEL_NAME -o orderer.example.com:7050 --tls --cafile $ORDERER_CA
+```
+
+## Step 4: Backup the System
+
+```bash
+docker stop $(docker ps -q --filter name=orderer)
+tar -czf orderer_backup.tar.gz /var/hyperledger/production/orderer
+docker start $(docker ps -aq --filter name=orderer)
+```
+
+## Step 5: Switch to BFT and Update Consenter Mapping
+
+```bash
+# Prepare the new consenter mapping
+cat << EOF > consenter_mapping.json
+[
+  {
+    "id": 1,
+    "host": "orderer1.example.com",
+    "port": 7050,
+    "msp_id": "OrdererMSP",
+    "identity": "base64_encoded_identity",
+    "client_tls_cert": "base64_encoded_client_cert",
+    "server_tls_cert": "base64_encoded_server_cert"
+  },
+  {
+    "id": 2,
+    "host": "orderer2.example.com",
+    "port": 7050,
+    "msp_id": "OrdererMSP",
+    "identity": "base64_encoded_identity",
+    "client_tls_cert": "base64_encoded_client_cert",
+    "server_tls_cert": "base64_encoded_server_cert"
+  },
+  {
+    "id": 3,
+    "host": "orderer3.example.com",
+    "port": 7050,
+    "msp_id": "OrdererMSP",
+    "identity": "base64_encoded_identity",
+    "client_tls_cert": "base64_encoded_client_cert",
+    "server_tls_cert": "base64_encoded_server_cert"
+  },
+  {
+    "id": 4,
+    "host": "orderer4.example.com",
+    "port": 7050,
+    "msp_id": "OrdererMSP",
+    "identity": "base64_encoded_identity",
+    "client_tls_cert": "base64_encoded_client_cert",
+    "server_tls_cert": "base64_encoded_server_cert"
+  }
+]
+EOF
+
+# Update the config with new consensus type, metadata, and consenter mapping
+jq --slurpfile mapping consenter_mapping.json '
+  .channel_group.groups.Orderer.values.ConsensusType.value.type = "BFT" |
+  .channel_group.groups.Orderer.values.ConsensusType.value.metadata = {
+    "options": {
+      "election_tick": 10,
+      "heartbeat_tick": 1,
+      "max_inflight_blocks": 5,
+      "snapshot_interval_size": 16777216
+    }
+  } |
+  .channel_group.groups.Orderer.values.Orderers.value.consenter_mapping = $mapping[0]
+' updated_config.json > bft_config.json
+
+# Create and submit the config update
+configtxlator proto_encode --input current_config.json --type common.Config --output current_config.pb
+configtxlator proto_encode --input bft_config.json --type common.Config --output updated_config.pb
+configtxlator compute_update --channel_id $CHANNEL_NAME --original current_config.pb --updated updated_config.pb --output config_update.pb
+
+peer channel signconfigtx -f config_update.pb
+peer channel update -f config_update.pb -c $CHANNEL_NAME -o orderer.example.com:7050 --tls --cafile $ORDERER_CA
+```
+
+## Step 6: Restart and Validate
+
+```bash
+docker restart $(docker ps -q --filter name=orderer)
+
+# Check logs for all orderers
+for orderer in orderer1 orderer2 orderer3 orderer4; do
+  echo "Checking logs for $orderer"
+  docker logs -f $orderer 2>&1 | grep -E "SmartBFT-v3 is now servicing chain|Message from leader"
+done
+```
+
+## Step 7: Exit Maintenance Mode
+
+```bash
+jq '.channel_group.groups.Orderer.values.ConsensusType.value.state = "STATE_NORMAL"' bft_config.json > normal_config.json
+
+configtxlator proto_encode --input bft_config.json --type common.Config --output current_config.pb
+configtxlator proto_encode --input normal_config.json --type common.Config --output updated_config.pb
+configtxlator compute_update --channel_id $CHANNEL_NAME --original current_config.pb --updated updated_config.pb --output config_update.pb
+
+peer channel signconfigtx -f config_update.pb
+peer channel update -f config_update.pb -c $CHANNEL_NAME -o orderer.example.com:7050 --tls --cafile $ORDERER_CA
+```
+
+## Step 8: Verify Migration
+
+```bash
+peer channel fetch config latest_config.pb -o orderer.example.com:7050 -c $CHANNEL_NAME --tls --cafile $ORDERER_CA
+
+configtxlator proto_decode --input latest_config.pb --type common.Block | jq '.data.data[0].payload.data.config.channel_group.groups.Orderer.values.ConsensusType, .data.data[0].payload.data.config.channel_group.groups.Orderer.values.Orderers'
+```
+
+## Notes:
+
+1. Ensure all ordering nodes are running Fabric v3.0.0 or higher before migration.
+2. This process should be performed during a maintenance window to minimize disruption.
+3. The migration is irreversible. Ensure you have a proper backup before proceeding.
+4. The number of consenters in the BFT configuration should be 3f + 1, where f is the number of tolerated failures. In this example, we use 4 consenters, tolerating 1 failure.
+5. Test this process in a non-production environment first.