Managing IPs

In order to manage IPs via CAIPAMX, a NutanixIPPool has to be created via the Kubernetes API. The NutanixIPPool specifies which Nutanix cluster and subnet to manage IPs in, and which credentials to use to perform IP operations.

Create Nutanix credentials secret

$ export NUTANIX_USER=...
$ export NUTANIX_PASSWORD=...

$ cat <<EOF | kubectl apply --server-side -f -
apiVersion: v1
kind: Secret
metadata:
  name: pc-creds-for-ipam
stringData:
  credentials: |
    [
      {
        "type": "basic_auth",
        "data": {
          "prismCentral":{
            "username": "${NUTANIX_USER}",
            "password": "${NUTANIX_PASSWORD}"
          }
        }
      }
    ]
EOF

Create the IP pool

$ export NUTANIX_ENDPOINT=<pc-ip or pc-fqdn>
$ export NUTANIX_SUBNET=...

$ cat <<EOF | kubectl apply --server-side -f -
apiVersion: ipam.cluster.x-k8s.io/v1alpha1
kind: NutanixIPPool
metadata:
  name: nutanixippool-sample
spec:
  prismCentral:
    address: ${NUTANIX_ENDPOINT}
    port: 9440
    credentialsSecretRef:
      name: pc-creds-for-ipam
  subnet: ${NUTANIX_SUBNET}
EOF

Create the IP address claim

$ cat <<EOF | kubectl apply --server-side -f -
apiVersion: ipam.cluster.x-k8s.io/v1beta1
kind: IPAddressClaim
metadata:
  name: my-ip
spec:
  poolRef:
    apiGroup: ipam.cluster.x-k8s.io
    kind: NutanixIPPool
    name: nutanixippool-sample
EOF

Check the IP address has been reserved

As this is asynchronous you may have to wait for a short period until the IP address is reserved and the Kubernetes IPAddress exists.

$ kubectl get ipaddress my-ip
NAME    ADDRESS        POOL NAME              POOL KIND       AGE
my-ip   10.40.142.50   nutanixippool-sample   NutanixIPPool   3s

Delete the IP address claim

$ kubectl delete ipaddressclaim my-ip
ipaddressclaim.ipam.cluster.x-k8s.io "my-ip" deleted

Again, this operation is asynchronous so the deletion of the associated IPAddress will take a short time, but once the IP has been unreserved, both the IP address claim and the IP address resouces will have been deleted:

$ kubectl get ipaddressclaim,ipaddress my-ip
Error from server (NotFound): ipaddressclaims.ipam.cluster.x-k8s.io "my-ip" not found
Error from server (NotFound): ipaddresses.ipam.cluster.x-k8s.io "my-ip" not found