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Rancher滚动无感知切换镜像

· 2 min read
chenweibo

springboot 引入依赖​

   <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
   </dependency>

修改配置暴露端点​

server:
  port: 7878
  shutdown: graceful

liteflow:
  rule-source: config/**/*.el.xml
# Spring
spring:
  mvc:
    async:
      request-timeout: 30000
  application:
    # 应用名称
    name: xxxx
  main:
    allow-bean-definition-overriding: true
  profiles:
    # 环境配置
    active: @spring.profiles.active@
  lifecycle:
    # 优雅下线超时时间
    timeout-per-shutdown-phase: 5m
# 暴露 shutdown 接口
management:
  endpoint:
    health:
      probes:
        enabled: true
      # 启用 shutdown 端点
    shutdown:
      enabled: true

创建一个端点来从 nacos 主动下线并且停止服务​


import com.alibaba.cloud.nacos.NacosDiscoveryProperties;
import com.alibaba.cloud.nacos.registry.NacosRegistration;
import com.alibaba.cloud.nacos.registry.NacosServiceRegistry;
import lombok.extern.log4j.Log4j2;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
import org.springframework.stereotype.Component;

@Component
@Endpoint(id = "deregister")
@Log4j2
public class NacosServiceDeregisterEndpoint {

    @Autowired
    private NacosDiscoveryProperties nacosDiscoveryProperties;

    @Autowired
    private NacosRegistration nacosRegistration;

    @Autowired
    private NacosServiceRegistry nacosServiceRegistry;

    /**
     * 从 nacos 中主动下线，用于 k8s 滚动更新时，提前下线分流流量
     *
     */
    @ReadOperation
    public String endpoint() {
        String serviceName = nacosDiscoveryProperties.getService();
        String groupName = nacosDiscoveryProperties.getGroup();
        String clusterName = nacosDiscoveryProperties.getClusterName();
        String ip = nacosDiscoveryProperties.getIp();
        int port = nacosDiscoveryProperties.getPort();

        log.info("deregister from nacos, serviceName:{}, groupName:{}, clusterName:{}, ip:{}, port:{}", serviceName, groupName, clusterName, ip, port);
        log.error("nacos下线成功提示");
        // 设置服务下线
        nacosServiceRegistry.setStatus(nacosRegistration, "DOWN");

        return "success";
    }
}

rancher 配置​

//设置优雅停机字段
  terminationGracePeriodSeconds: 600

//设置PreStop
sh -c 'curl http://127.0.0.1:7878/actuator/deregister;sleep 30;curl -X POST http://127.0.0.1:7878/actuator/shutdown;'

//设置健康检查等探针


    spec:
      containers:
        - image: xxx.xxx.com/xxx/xxx-xx-xxx:3.3.0
          imagePullPolicy: Always
          lifecycle:
            preStop:
              exec:
                command:
                  - sh
                  - '-c'
                  - >-
                    curl http://127.0.0.1:7878/actuator/deregister;sleep 30;curl -X POST
                    http://127.0.0.1:7878/actuator/shutdown;
          livenessProbe:
            failureThreshold: 10
            httpGet:
              path: /actuator/health/liveness
              port: 7878
              scheme: HTTP
            initialDelaySeconds: 10
            periodSeconds: 10
            successThreshold: 1
            timeoutSeconds: 10
          name: zdcloud-barcode-web
          ports:
            - containerPort: 7878
              name: 7878tcp2
              protocol: TCP
          readinessProbe:
            failureThreshold: 10
            httpGet:
              path: /actuator/health/readiness
              port: 7878
              scheme: HTTP
            initialDelaySeconds: 10
            periodSeconds: 10
            successThreshold: 1
            timeoutSeconds: 10
          startupProbe:
            failureThreshold: 30
            httpGet:
              path: /actuator/health/liveness
              port: 7878
              scheme: HTTP
            initialDelaySeconds: 10
            periodSeconds: 10
            successThreshold: 1
            timeoutSeconds: 10
          terminationMessagePath: /dev/termination-log
          terminationMessagePolicy: File
          __active: true
          resources: {}