在 k8s 中配置 Spring Cloud 服务 (Eureka 客户端) 优雅下线

修改 application.yml 暴露接口

management:  
  endpoints:  
    web:  
      exposure:  
        include: "*"

client 强制下线接口:

curl -X "POST" "http://localhost:8888/actuator/service-registry?status=DOWN"
-H "Content-Type: application/vnd.spring-boot.actuator.v2+json;charset=UTF-8"

Eureka Server 强制下线接口：

PUT /eureka/apps/${appId}/${ip:port}/status?value=OUT_OF_SERVICE

配置 preStop

lifecycle:
  preStop:
    exec:
      command:
        - bash
        - -c                
        - 'curl -X POST --data DOWN http://127.0.0.1:8888/service-registry/instance-status -H "Content-Type: application/vnd.spring-boot.actuator.v2+json;charset=UTF-8";sleep 90'

同时指定一下优雅终止宽限期

terminationGracePeriodSeconds: 90

完整 demo:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: {PROJECT}
  namespace: {K8S_NAMESPACE}
  labels:
    app: {PROJECT}
spec:
  replicas: {REPLICAS}
  selector:
    matchLabels:
      app: {PROJECT}
  template:
    metadata:
      labels:
        app: {PROJECT}
    spec:
      imagePullSecrets:
        - name: harbor-registry
      terminationGracePeriodSeconds: 90
      volumes:
      - name: heap-dumps
        emptyDir: {}
      containers:
      - name: {PROJECT}
        image: {IMAGE_URL}
        imagePullPolicy: Always
        volumeMounts:
        - name: heap-dumps
          mountPath: /dumps
        command: ["java"]
        args: {ARGS}
        ports:
        - containerPort: 8888
        env:
        - name: ENV
          value: {ENV}
        lifecycle:
          preStop:
            exec:
              command:
                - bash
                - -c                
                - 'curl -X POST --data DOWN http://127.0.0.1:8888/service-registry/instance-status -H "Content-Type: application/vnd.spring-boot.actuator.v2+json;charset=UTF-8";sleep 90'
           
      #  resources:
      #    requests:
      #      memory: "1Gi"
      #      cpu: "500m"
      #    limits:
      #      memory: "1200Mi"
      #      cpu: "500m"
        readinessProbe:
          httpGet:
            path: /actuator/health
            port: 8888
            scheme: HTTP
          initialDelaySeconds: 10
          timeoutSeconds: 2
          periodSeconds: 10     
---      
apiVersion: v1
kind: Service
metadata:
  name: {PROJECT}
  namespace: {K8S_NAMESPACE}
spec:
  type: NodePort
  ports:
  - port: 8888
    protocol: TCP
    targetPort: 8888
  selector:
    app: {PROJECT}
---
apiVersion: extensions/v1beta1
kind: Ingress 
metadata:
  name: {ENV}-{PROJECT}
  namespace: {K8S_NAMESPACE}
  annotations:
    kubernetes.io/ingress.class: "nginx"
spec:
  rules:
  - host: {ENV}-{PROJECT}.intramirror.cn
    http:
      paths:
      - backend:
          serviceName: {PROJECT}
          servicePort: 8888
        path: /
        pathType: ImplementationSpecific

【参考链接】
实用技巧：Spring Cloud 中，如何优雅下线微服务？
http://www.itmuch.com/spring-cloud-sum/how-to-unregister-service-in-eureka/
Spring Cloud 服务优雅下线
https://www.jianshu.com/p/1e628a74ac90
在 k8s 中使用 eureka 的几种姿势
https://gitee.com/sunshanpeng/blog/blob/master/%E5%9C%A8k8s%E4%B8%AD%E4%BD%BF%E7%94%A8eureka%E7%9A%84%E5%87%A0%E7%A7%8D%E5%A7%BF%E5%8A%BF.md
Kubernetes Pod Hook
https://i4t.com/4424.html
使用 k8s 部署 springcloud 解决三大问题
https://www.cnblogs.com/sanduzxcvbnm/p/13212718.html
Eureka 客户端下线的几种方式比较
https://blog.csdn.net/CSDN_WYL2016/article/details/107336260
https://www.cnblogs.com/sanduzxcvbnm/category/1580444.html
https://github.com/hellorocky/blog
https://horus-k.github.io/