spec.clusterIP: Invalid value: "": field is immutable

`spec.clusterIP: Invalid value: "": field is immutable` 是指在 Helm 中尝试更新一个已经安装的 Kubernetes 资源（如 Service）时，如果该资源的 `clusterIP` 字段被设置为默认值（通常是 "" 或空字符串），并且该字段在 Helm 的配置规范中被认为是只读（immutable），那么将会抛出这个错误。Helm v3.3.0-rc.2 及后续版本可能认为 `clusterIP` 属性不能在升级过程中更改。

解决这个问题的方法通常是在创建或更新 Service 定义时明确指定一个非默认的 `clusterIP` 值，比如使用 `ClusterIP: None` 或者 `ClusterIP: <specific-ip>`。这样可以避免因为尝试改变只读属性而导致的升级失败。

示例操作：

apiVersion: v1
kind: Service
metadata:
  name: c-api-svc
spec:
  type: ClusterIP
  clusterIP: None  # 或者特定 IP 地址
  ports:
    - port: 80
      targetPort: 80

之后再使用 `helm upgrade` 命令进行升级：

helm upgrade c-api ./c-api --set service.clusterIP=None --force

相关问题

The Service "service-test" is invalid: spec.sessionAffinity: Unsupported value: "ClusterIP": supported values: "ClientIP", "None"

这个错误提示是由 Kubernetes 提供的，意思是 Service 的 spec.sessionAffinity 字段的值不被支持。目前 Kubernetes 支持的值有 "ClientIP" 和 "None"，如果你使用的是 "ClusterIP"，就会出现这个错误。

要解决这个问题，你需要将 Service 的 spec.sessionAffinity 字段的值修改为 "ClientIP" 或 "None"。如果你想要了解更多关于 Service 的配置和使用，可以查看 Kubernetes 官方文档。

The ReplicationController "mysql-rc" is invalid: spec.template.metadata.labels: Invalid value: map[string]string{"name":"mysql"}: `selector` does not match template `labels`

The error message indicates that the ReplicationController "mysql-rc" is invalid because the labels in the `selector` field do not match the labels in the `template` field of the ReplicationController's spec.

In Kubernetes, a ReplicationController uses labels to select and manage a set of replica Pods. The `selector` field in the ReplicationController's spec is used to match the labels of the Pods it manages, while the `template` field is used to define the desired state of the Pods.

To resolve this issue, you need to ensure that the labels defined in the `selector` field match the labels defined in the `template` field of the ReplicationController's spec. Double-check the labels in both fields and make sure they are identical.

Here is an example of a valid ReplicationController definition with matching labels:

apiVersion: v1
kind: ReplicationController
metadata:
  name: mysql-rc
spec:
  replicas: 3
  selector:
    matchLabels:
      name: mysql
  template:
    metadata:
      labels:
        name: mysql
    spec:
      containers:
      - name: mysql
        image: mysql:latest
        ports:
        - containerPort: 3306

Make sure to replace the image, ports, and other configuration values according to your requirements.