Comments (1)
现有代码的做法
https://goteleport.com/blog/golang-ssh-bastion-graceful-restarts/.
Tencent 腾讯家的 tRPC-go 做法
https://github.com/trpc-group/trpc-go/blob/main/docs/user_guide/graceful_restart.zh_CN.md
tRPC-Go 实现热重启的原理大致总结如下:
服务启动的时候监听信号 SIGUSR2 作为热重启信号(可自定义);
- 服务进程在启动的时候,会将启动的每个 servertransport 的 listenfd 记录下来;
- 当服务进程接收到 SIGUSR2 信号之后,开始执行热重启逻辑;
- 服务进程通过 ForkExec 来创建一个进程副本(不同于 fork),并通过 ProcAttr 传递 listenfd 给子进程,同时通过环境变量来告知子进程当前是热重启模式,也通过环境变量来传递 listenfd 的起始值以及数量;
- 子进程正常启动,在实例化 servertransport 的时候稍有特殊,会检查当前是否是热重启模式,如果是则继承父进程 listenfd 并重建 listener,反之则走正常启动逻辑;
- 子进程启动之后,立马提供正常服务,父进程得知子进程创建成功之后,择一合适时机退出,如 shutdown tcpconn read、停止 consumer 消费消息、service 上请求都已经正常处理之后再退出;
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