[
  {
    "op": "add",
    "path": "/spec/kubeadmConfigSpec/clusterConfiguration/apiServer/extraVolumes",
    "value":       [
        {
          "hostPath": "/etc/kubernetes/certs/dex-cert",
          "mountPath": "/etc/kubernetes/certs/dex-cert",
          "name": "dex-cert",
          "readOnly": true
        }
      ]
  },
  {
    "op": "add",
    "path": "/spec/kubeadmConfigSpec/files/-",
    "value": {
      "contentFrom": {
        "secret": {
          "key": "tls.crt",
          "name": "dex-apiserver-secret"
        }
      },
      "owner": "root:root",
      "path": "/etc/kubernetes/certs/dex-cert",
      "permissions": "0644"
    }
  },
  {
    "op": "add",
    "path": "/spec/kubeadmConfigSpec/preKubeadmCommands/-",
    "value": "echo '10.23.25.102 dex.utility.local' | tee -a /etc/hosts"
  }
]