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README.bridge.md

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Network Bridge Device Plugin

This device plugin allows user to attach pods to existing bridges on nodes.

Note: Currently device plugins are feature gated, you need to open it in order to test this plugin, for minikube this works as follows: minikube start --feature-gates=DevicePlugins=true --vm-driver kvm2 --network-plugin=cni

Usage

The plugin does not create bridges, thus it's up to the user to create any bridge on the nodes of a cluster. If a bridge doesn't exist, the user can create it (with root privileges) as follows:

$ ip link add mybr0 type bridge
$ ip link set dev mybr0 up
$ ip link show mybr0
6: mybr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/ether fe:1b:e5:82:d3:b5 brd ff:ff:ff:ff:ff:ff

Now the user must specify list of bridges that should be exposed to pods:

$ kubectl create configmap device-plugin-network-bridge --from-literal=bridges="mybr0"
configmap "device-plugin-network-bridge" created

Note: Multiple bridges can be exposed by using a comma separated list of names: mybr0,mybr1,mybr2

Once this is done, the device plugin can be deployed using daemon set:

$ kubectl apply -f https://raw.githubusercontent.com/kubevirt/kubernetes-device-plugins/master/manifests/bridge-ds.yml
daemonset "device-plugin-network-bridge" created

$ kubectl get pods
NAME                                 READY     STATUS    RESTARTS   AGE
device-plugin-network-bridge-745x4   1/1       Running   0          5m

If the daemonset is running the user can define a pod requesting secondary interface connected to bridge mybr0.

apiVersion: v1
kind: Pod
metadata:
  name: bridge-consumer
spec:
  containers:
  - name: busybox
    image: busybox
    command: ["/bin/sleep", "123"]
    resources:
      limits:
        bridge.network.kubevirt.io/mybr0: 1
$ kubectl apply -f https://raw.githubusercontent.com/kubevirt/kubernetes-device-plugins/master/examples/bridge-consumer.yml
pod "bridge-consumer" created

Once the pod is created is should contain a secondary interface connected to the bridge.

$ kubectl exec -it bridge-consumer ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: sit0@NONE: <NOARP> mtu 1480 qdisc noop qlen 1
    link/sit 0.0.0.0 brd 0.0.0.0
4: eth0@if10: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1460 qdisc noqueue 
    link/ether 0a:58:0a:01:00:04 brd ff:ff:ff:ff:ff:ff
11: mybr0-20@if12: <BROADCAST,MULTICAST,M-DOWN> mtu 1500 qdisc noop 
    link/ether 96:21:62:8b:11:9e brd ff:ff:ff:ff:ff:ff

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