k8s service 增加會話保持模式

會話保持模式

• 基於客戶端地址的會話保持模式，即來自同一個客戶端發起的所有請求都會轉發到固定的一個Pod上。此模式可以使在spec中添加sessionAffinity:ClientIP配置

# service 中增加  sessionAffinity: ClientIP ; 默認  sessionAffinity: None

[root@k8sNode0 podqinhexing]# cat test-nodeport.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 3
  template:
    metadata:
      labels:
        app: nginx
    spec:
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
          - labelSelector:
              matchExpressions:
              - key: app
                operator: In
                values:
                - nginx
            topologyKey: "kubernetes.io/hostname"
      containers:
      - name: nginx-server
        image: nginx:latest

---
apiVersion: v1
kind: Service
metadata:
  name: nginx-svc
spec:
  selector:
    app: nginx
  type: NodePort
  sessionAffinity: ClientIP # 會話保持模式
  ports:
  - port: 80  # Service端口，自己指定       
    targetPort: 80 # pod端口，注意和上面要選擇的pod保持一致
    nodePort: 31122