Single node cluster adjustments

Update the following changes, then commit and push.

Reduce Longhorn replica count

Set the defaultClassReplicaCount to 1:

system/longhorn-system/values.yaml

longhorn:
  defaultSettings:
    nodeDownPodDeletionPolicy: delete-both-statefulset-and-deployment-pod
  persistence:
    # If you have three or more nodes for storage, use 3; otherwise use 2
    defaultClassReplicaCount: 3  # TODO run DR test to see if we actually need 3
  defaultBackupStore:
    backuptarget: cifs://nas-01.storage.lajas.tech/longhorn_backup
    backupTargetCredentialSecret: &backupSecret cifs-secret
  ingress:
    enabled: true
    ingressClassName: nginx
    host: longhorn.lajas.tech
    tls: true
    secureBackends: true
    tlsSecret: longhorn-tls-certificate
    annotations:
      cert-manager.io/cluster-issuer: letsencrypt-prod
      hajimari.io/appName: Longhorn-UI
      hajimari.io/icon: harddisk


opSecrets:
  vault: "z3emsr5qi5xqk33wthv5fpmfqa"
  backup:
    item: "yspbvafwzgsnq4yihwtbwipcsy"
    secretName: *backupSecret

Disable automatic upgrade for OS and k3s

Because they will try to drain the only node, the pods will have no place to go. Remove them entirely:

rm -rf system/kured
rm -rf system/system-upgrade

Commit and push the change. You can revert it later when you add more nodes.