Configure Pod with Additional Interfaces

To create pods with additional Interfaces follow the Kubernetes Network Custom Resource Definition De-facto Standard Version 1 1, the next steps can be followed:

  1. Create Neutron net/subnets which you want the additional interfaces attach to.

$ openstack network create net-a
$ openstack subnet create subnet-a --subnet-range 192.0.2.0/24 --network net-a

  1. Create CRD of ‘NetworkAttachmentDefinition’ as defined in NPWG spec.

$ cat << EOF > nad.yaml
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
  name: network-attachment-definitions.k8s.cni.cncf.io
spec:
  group: k8s.cni.cncf.io
  version: v1
  scope: Namespaced
  names:
    plural: network-attachment-definitions
    singular: network-attachment-definition
    kind: NetworkAttachmentDefinition
    shortNames:
    - net-attach-def
validation:
  openAPIV3Schema:
    properties:
      spec:
        properties:
          config:
            type: string
EOF
$ kubectl apply -f nad.yaml

3. Create NetworkAttachmentDefinition object with the UUID of Neutron subnet defined in step 1.

$ cat << EOF > net-a.yaml
apiVersion: "k8s.cni.cncf.io/v1"
kind: NetworkAttachmentDefinition
metadata:
  name: "net-a"
  annotations:
    openstack.org/kuryr-config: '{
    "subnetId": "uuid-of-neutron-subnet-a"
    }'
EOF
$ kubectl apply -f net-a.yaml

  1. Enable the multi-vif driver by setting ‘multi_vif_drivers’ in kuryr.conf. Then restart kuryr-controller.

[kubernetes]
multi_vif_drivers = npwg_multiple_interfaces

  1. Add additional interfaces to pods definition. e.g.

$ cat << EOF > pod.yaml
apiVersion: v1
kind: Pod
metadata:
  name: nginx4
  annotations:
    k8s.v1.cni.cncf.io/networks: net-a
spec:
  containers:
  - name: nginx
      image: nginx:1.7.9
      ports:
      - containerPort: 80
EOF
$ kubectl apply -f pod.yaml

You may put a list of network separated with comma to attach Pods to more networks.