Why am I getting `0/1 nodes are available` when running Docker Desktop?

Question

I'm running Docker Desktop with Kubernetes.

I can ssh to the node and I have other pods running on the node.

However, when I apply a StatefulSet to the cluster I get:

0/1 nodes are available: 1 pod has unbound immediate PersistentVolumeClaims. preemption: 0/1 nodes are available: 1 Preemption is not helpful for scheduling.

The Stateful Set is here:

https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/#components

kubectl get no
NAME             STATUS   ROLES           AGE    VERSION
docker-desktop   Ready    control-plane   6d2h   v1.24.1

Answer 1

If you are applying the manifest defined here as it is, the problem is in the below snippet, particularly with the storageClassName. Likely, your cluster does not have a storage class called my-storage-class.

 volumeClaimTemplates:
  - metadata:
      name: www
    spec:
      accessModes: [ "ReadWriteOnce" ]
      storageClassName: "my-storage-class"
      resources:
        requests:
          storage: 1Gi

To get the definitive error statement, you can run the following command:

kubectl describe  pvc www-web-0

you will notice something like:

storageclass.storage.k8s.io "my-storage-class" not found

Solution:

You can run the following command to get your cluster's available storage class and replace it in yaml file.

kubectl get sc

Alternatively, you can delete the storageClassName and let the default storage class do the magic. However, for this to work, you must have a default sc present in your cluster.

If you have no storage class present, you need to create one. Check this out.