1. 默认方式

给pod分配多网卡，没有特殊配置，默认是default ns的。这时net-attach-def的网卡分别从net1开始往上加，eth0为k8s默认cni的网卡名字

1.1 YAML方式：

$ cat <<EOF | kubectl create -f -
apiVersion: v1
kind: Pod
metadata:
  name: pod-case-01
  annotations:
    k8s.v1.cni.cncf.io/networks: macvlan-conf-1, macvlan-conf-2
spec:
  containers:
  - name: pod-case-01
    image: docker.io/centos/tools:latest
    command:
    - /sbin/init
EOF

1.2 JSON方式：

$ cat <<EOF | kubectl create -f -
apiVersion: v1
kind: Pod
metadata:
  name: pod-case-04
  annotations:
    k8s.v1.cni.cncf.io/networks: '[
            { "name" : "macvlan-conf-1" },
            { "name" : "macvlan-conf-2" }
    ]'
spec:
  containers:
  - name: pod-case-04
    image: docker.io/centos/tools:latest
    command:
    - /sbin/init
EOF

2. 指定ns的net-attach-def

2.1 YAML方式：

$ cat <<EOF | kubectl create -f -
apiVersion: v1
kind: Pod
metadata:
  name: pod-case-02
  annotations:
    k8s.v1.cni.cncf.io/networks: testns1/macvlan-conf-3
spec:
  containers:
  - name: pod-case-02
    image: docker.io/centos/tools:latest
    command:
    - /sbin/init
EOF

2.2 JSON方式

$ cat <<EOF | kubectl create -f -
apiVersion: v1
kind: Pod
metadata:
  name: pod-case-05
  annotations:
    k8s.v1.cni.cncf.io/networks: '[
            { "name" : "macvlan-conf-1",
              "namespace": "testns1" }
    ]'
spec:
  containers:
  - name: pod-case-05
    image: docker.io/centos/tools:latest
    command:
    - /sbin/init
EOF

3. 指定网卡名字

给容器中net-attach-def对应的网卡命名，方式：在annotation后面加@ifname，如给容器使用macvlan-conf-1的网卡命名为macvlan1，也可以使用interface参数

3.1 YAML方式

$ cat <<EOF | kubectl create -f -
apiVersion: v1
kind: Pod
metadata:
  name: pod-case-03
  annotations:
    k8s.v1.cni.cncf.io/networks: macvlan-conf-1@macvlan1
spec:
  containers:
  - name: pod-case-03
    image: docker.io/centos/tools:latest
    command:
    - /sbin/init
EOF

3.2 JSON方式

$ cat <<EOF | kubectl create -f -
apiVersion: v1
kind: Pod
metadata:
  name: pod-case-06
  annotations:
    k8s.v1.cni.cncf.io/networks: '[
            { "name" : "macvlan-conf-1",
              "interface": "macvlan1" },
            { "name" : "macvlan-conf-2" }
    ]'
spec:
  containers:
  - name: pod-case-06
    image: docker.io/centos/tools:latest
    command:
    - /sbin/init
EOF

4 路由配置

pod的默认路由一般是eth0对应网段的路由，可以通过JSON格式的default-route来指定默认路由

4.1 修改默认网卡

将默认路由配置为net1对应的网关，其中eth0为k8s默认cni的，net1为net-attach-def定义的网卡。

cat <<EOF | kubectl create -f -
apiVersion: v1
kind: Pod
metadata:
  name: samplepod
  annotations:
    k8s.v1.cni.cncf.io/networks: '[{
      "name": "macvlan-conf",
      "default-route": ["192.168.2.1"]
    }]'
spec:
  containers:
  - name: samplepod
    command: ["/bin/bash", "-c", "trap : TERM INT; sleep infinity & wait"]
    image: dougbtv/centos-network
EOF

4.2 设置default network

还有另外一种方式改默认路由，通过v1.multus-cni.io/default-network来配置默认网卡这种方式创建的pod，eth0就是vpc2-net1的，默认路由是vpc2-net1的，net1为share-net2的。用于可以通过 ovn.kubernetes.io/logical_switch 和attachnet1.ns1.ovn.kubernetes.io/logical_switch来选择对应的网络

apiVersion: v1
kind: Pod
metadata:
  name: p1-df-route5
  namespace: ns1
  annotations:
    v1.multus-cni.io/default-network: ns2/attachnet2
    ovn.kubernetes.io/logical_switch: vpc2-net1
    k8s.v1.cni.cncf.io/networks: ns1/attachnet1
    attachnet1.ns1.ovn.kubernetes.io/logical_switch: share-net2
spec:
  containers:
    - image: busybox
      command:
        - sleep
        - "3600"

k8s pod多网卡multus(3)——multus使用方式