kubernetes - Service

一：介绍

是kubernetes系统中提供的只能负载均衡器

1.服务发现

通过Label标签获取Pod

2.负载均衡

使用

kind: Deployment
apiVersion: apps/v1
metadata:
  name: test-service
spec:
  selector:
    matchLabels:
      app: test-svc
  template:
    metadata:
      labels:
        app: test-svc
    spec:
      containers:
        - name: nginx
          image: nginx:1.19.2

---
kind: Service
apiVersion: v1
metadata:
  name: nginx-svc
spec:
ClusterIP: None
  selector:
    app: test-svc
  ports:
    - port: 80
      targetPort: 80
      name: http
    - port: 443
      targetPort: 443
      name: https

查看

kubectl describe service nginx-svc

二：Service类型

1. ClusterIP

kind: Service
apiVersion: v1
metadata:
  name: svc
spec:
  ports:
    - name: http
      port: 80
      targetPort: 80
      nodePort: 30001
  selector:
    app: test-svc
  type: NodePort

2. NodePort

3.HeadLess

kind: Service
apiVersion: v1
metadata:
  name: test-svc
spec:
  ClusterIP: None
  selector:
    app: test-svc
  ports:
    - post: 80
      targetPort: 80
    - post: 443
      targetPort: 443
 

4.LoadBalancer

关联云服务商的弹性IP

kind: Service
apiVersion: v1
metadata:
  name: loadbalancer
spec:
  type: LoadBalancer
  ports:
    - port: 80
      targetPort: 80
      name: http
  selector:
    app: test

---
kind: Deployment
apiVersion: apps/v1
metadata:
  name: loadbalancer
spec:
  selector:
    matchLabels:
      app: test
  template:
    metadata:
      labels:
        app: test
    spec:
      containers:
        - name: nginx
          image: nginx
          ports:
            - containerPort: 80
              name: nginx-http