基于nacos的服务平滑上下线方案

所谓平滑上下线简单说就是系统发版升级过程对用户无感知，不至于等到夜深人静的时候偷偷去搞，某些请求时间可以长点，但不能失败。

主要是基于naocs提供的SDK接口进行服务的注销和注册。

在对应服务中新增注销服务的接口和注册服务的接口。

代码如下：

package com.gaopeng.cloud.controller;

import com.alibaba.cloud.nacos.NacosDiscoveryProperties;
import com.alibaba.cloud.nacos.registry.NacosRegistration;
import com.alibaba.nacos.api.exception.NacosException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class NacosController {
    protected final transient Logger log = LoggerFactory.getLogger(getClass());

    @Autowired
    NacosDiscoveryProperties nacosDiscoveryProperties;

    @Autowired
    NacosRegistration nacosRegistration;

    /**
     * 服务注册接口
     *
     * @return
     */
    @GetMapping(value = "/api/nacos/register")
    public String registerInstance() {
        String serviceName = nacosDiscoveryProperties.getService();
        String groupName = nacosDiscoveryProperties.getGroup();
        String clusterName = nacosDiscoveryProperties.getClusterName();
        String ip = nacosDiscoveryProperties.getIp();
        int port = nacosDiscoveryProperties.getPort();

        log.info("register from nacos, serviceName:{}, groupName:{}, clusterName:{}, ip:{}, port:{}", serviceName, groupName, clusterName, ip, port);
        try {
            nacosRegistration.getNacosNamingService().registerInstance(serviceName, groupName, ip, port, clusterName);

        } catch (NacosException e) {
            log.error("register from nacos error", e);
            return "error";
        }
        return "success";
    }

    /**
     * 服务注销接口
     *
     * @return
     */
    @GetMapping(value = "/api/nacos/deregister")
    public String deregisterInstance() {
        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);
        try {
            nacosRegistration.getNacosNamingService().deregisterInstance(serviceName, groupName, ip, port, clusterName);

        } catch (NacosException e) {
            log.error("deregister from nacos error", e);
            return "error";
        }
        return "success";
    }

}

 

系统升级步骤：   

a、在系统升级前先调用注销接口将目标服务实例注销，服务实例列表中将会删除该实例

b、注销之后将这个实例服务进行打包部署

c、部署后，调用服务注册接口将该服务重新注册

d、重复a、b、c完成服务的平滑升级过程

缺点：

1、需要开发人员手动增加服务注销和注册的接口

2、存在时间窗口，服务实例状态变化感知不实时