如何使用kubectl补丁更改kubernetes容器的端口? [英] how to change port of a kubernetes container using kubectl patch?

问题描述

我想更改在我的kubernetes集群上运行的容器的端口.手动，我知道可以在基础YAML文件本身中进行更改.但是我想使用"kubectl patch"之类的命令来更改端口.

I want to change the port of a container running on my kubernetes clusture. Manually I know this can be changed in the underlying YAML file itself.But I want to do this using a command like "kubectl patch" to change the port.

Nginx.yaml

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

任何人都可以使用我的nginx.yaml作为更改容器属性(例如containerport，targetport，nodeport，port)的示例，向我展示"kubectl patch"命令的示例.我也想知道在什么基础上应用kubectl补丁.我的意思是它如何知道要对哪个容器进行补丁以及以什么标准(例如containerid，name等)知道，因为稍后我将创建一个html按钮来基于以下内容进行kubectl补丁一些条件，例如containerid或名称.请提供帮助.

Can anybody show me an example of the "kubectl patch" command using my nginx.yaml as an example for changing the container properties like the containerport,targetport,nodeport,port. And i also want to know on what basis the kubectl patch is applied.I mean how does it know what container to patch and on what criteria like containerid,name etc because later I will be creating a html button to do a kubectl patch based on some criteria like the containerid or name.So kindly help.

推荐答案

例如，您要将服务中的目标端口更新为8080.请按照以下步骤

say, you want to update the target port to 8080 in service. follow the below steps

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

Patch the nginx service using the below command

# 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已更新为8080

verify that the targetPort is updated to 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: {}

遵循类似的部署方式

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

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