如何使用 kubectl 补丁更改 kubernetes 容器的端口？

Question

我想更改在我的 kubernetes 集群上运行的容器的端口。手动我知道这可以在底层 YAML 文件本身中更改。但我想使用“kubectl patch”之类的命令来更改端口。

Nginx.yaml

apiVersion: v1
kind: Service
metadata:
  name: nginx
  labels: 
    app: nginx 
spec:
  type: NodePort     
  ports:
  - name: nginxport
    port: 80
    targetPort: 80
    nodePort: 30000
  selector:
    app: nginx
    tier: frontend    

---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx
  labels:
    app: nginx
spec:
  selector:
    matchLabels:
      app: nginx
      tier: frontend
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: nginx
        tier: frontend
    spec:

      containers:
      - image: suji165475/devops-sample:#{Build.BuildId}#
        name: nginx
        ports:
        - containerPort: 80
          name: nginxport

任何人都可以向我展示“kubectl patch”命令的示例，使用我的 nginx.yaml 作为更改容器属性（如容器端口、目标端口、节点端口、端口）的示例。而且我还想知道在什么基础上应用了 kubectl 补丁。我的意思是它如何知道要修补的容器以及容器 ID、名称等标准，因为稍后我将创建一个 html 按钮来基于一些标准，如容器 ID 或名称。所以请帮忙。

Answer 1

假设您想在服务中将目标端口更新为 8080。请按照以下步骤操作

apiVersion: v1
kind: Service
metadata:
  name: nginx
  labels: 
    app: nginx 
spec:
  type: NodePort     
  ports:
  - name: nginxport
    port: 80
    targetPort: 80
    nodePort: 30000
  selector:
    app: nginx
    tier: frontend 

使用以下命令修补 nginx 服务

# kubectl patch svc nginx --patch \
>   '{"spec": { "type": "NodePort", "ports": [ { "nodePort": 30000, "port": 80, "protocol": "TCP", "targetPort": 8080 } ] } }'
service/nginx patched

to update nodeport and targetport use the below command

kubectl patch svc nginx --patch \
  '{"spec": { "type": "NodePort", "ports": [ { "nodePort": 32000, "port": 80, "protocol": "TCP", "targetPort": 8080 } ] } }'

验证 targetPort 是否更新为 8080

master $ kubectl get svc nginx -oyamlapiVersion: v1
kind: Service
metadata:
  creationTimestamp: "2019-08-29T11:08:45Z"
  labels:
    app: nginx
  name: nginx
  namespace: default
  resourceVersion: "5837"
  selfLink: /api/v1/namespaces/default/services/nginx
  uid: 5e7f6165-ca4d-11e9-be03-0242ac110042
spec:
  clusterIP: 10.105.220.186
  externalTrafficPolicy: Cluster
  ports:
  - name: nginxport
    nodePort: 30000
    port: 80
    protocol: TCP
    targetPort: 8080
  selector:
    app: nginx
    tier: frontend
  sessionAffinity: None
  type: NodePort
status:
  loadBalancer: {}

使用类似的方法进行部署

kubectl patch deploy nginx --patch .....