kubectl 补丁：将端口添加到部署的 pod 模板

Question

我有一个部署运行一个由一个独特容器组成的 pod。部署当前已启动并正在运行，我想修改其 pod 模板以向容器添加端口。

以下是当前定义的端口：

$ kubectl get deployment -o yaml spark-master | yq -r -y '.spec.template.spec.containers[] | select(.name=="spark-master").ports'
- containerPort: 7077
  protocol: TCP
- containerPort: 8080
  protocol: TCP

这是我尝试添加端口的补丁6066：

$ kubectl patch deployment spark-master -p '{"op": "add", "path": "/spec/template/spec/containers/0/ports/-", "value": {"containerPort": 6066}}'
deployment "spark-master" not patched
$ kubectl get deployment -o yaml spark-master | yq -r -y '.spec.template.spec.containers[] | select(.name=="spark-master").ports'
- containerPort: 7077
  protocol: TCP
- containerPort: 8080
  protocol: TCP

……没有成功。

另一个尝试，这次指定端口协议：

$ kubectl patch deployment spark-master -p '{"op": "add", "path": "/spec/template/spec/containers/0/ports/-", "value": {"containerPort": 6066, "protocol": "TCP"}}'
deployment "spark-master" not patched
$ kubectl get deployment -o yaml spark-master | yq -r -y '.spec.template.spec.containers[] | select(.name=="spark-master").ports'
- containerPort: 7077
  protocol: TCP
- containerPort: 8080
  protocol: TCP

……还是没有成功。

---

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"9", GitVersion:"v1.9.4", GitCommit:"bee2d1505c4fe820744d26d41ecd3fdd4a3d6546", GitTreeState:"clean", BuildDate:"2018-03-12T16:29:47Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"9+", GitVersion:"v1.9.7-gke.3", GitCommit:"9b5b719c5f295c99de68ffb5b63101b0e0175376", GitTreeState:"clean", BuildDate:"2018-05-31T18:32:23Z", GoVersion:"go1.9.3b4", Compiler:"gc", Platform:"linux/amd64"}

Answer 1

这个怎么样：

kubectl patch deployment spark-master --type='json' -p='[{"op": "add", "path": "/spec/template/spec/containers/0/ports/-", "value": {"containerPort": 6066}}]'

编辑："protocol": "TCP"按照建议删除。

编辑 #2（解决麦哲伦的评论）：默认类型patch是--type='strategic'. 尝试的补丁使用JSON 补丁，因此--type='json'必须添加参数才能使命令工作。