概述

通过node port方式暴露的服务，kubernetes集群默认端口范围为30000-32767，但是可以通过手工修改。

实战

1、部署nginx服务

• nginx-deploy.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    name: nginx-test
  name: nginx-test
  namespace: default
spec:
  replicas: 1
  selector:
    matchLabels:
      name: nginx-test
  strategy:
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1
    type: RollingUpdate
  template:
    metadata:
      labels:
        name: nginx-test
    spec:
      containers:
      - image: registry.yunlearn.org:5000/release/nginx:1.19.6
        imagePullPolicy: IfNotPresent
        name: nginx-test
        ports:
        - containerPort: 80
          protocol: TCP
        resources: {}
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext: {}
      terminationGracePeriodSeconds: 30

nginx-svc.yaml

apiVersion: v1
kind: Service
metadata:
  labels:
    name: nginx-test
  name: nginx-test
  namespace: default
spec:
  ports:
  - name: http
    nodePort: 8088
    port: 80
    protocol: TCP
    targetPort: 80   
  selector:
    name: nginx-test
  type: NodePort

发现错误并处理

• 部署

kubectl create -f nginx-deploy.yaml 
kubectl create -f nginx-svc.yaml 
The Service "nginx" is invalid: spec.ports[0].nodePort: Invalid value: 80: provided port is not in the valid range. The range of valid ports is 30000-32767

• 修改配置
  kubernetes集群默认端口范围为30000-32767，企业可根据需求修改合适的端口范围

vi /etc/kubernetes/manifests/kube-apiserver.yaml
//找到 - --service-cluster-ip-range这一行，在这一行的下一行增加一行内容
- --service- node-port-range=10-65000

实操提示：三个master都需要修改，并检查apiserver容器是否已重启，如果没有自动重启，需手工重启