谈谈 nginx 信号集
http://io.upyun.com/2017/08/19/nginx-signals

nginx: worker process is shutting down
https://www.cnblogs.com/felixzh/p/8670770.html
http://siwei.me/blog/posts/nginx-worker-is-shutting-down

worker_shutdown_timeout
https://nginx.org/en/docs/ngx_core_module.html#worker_shutdown_timeout

是什么让你的 nginx 服务退出这么慢？
https://zhuanlan.zhihu.com/p/34792840

从websocket服务的nginx配置说起
https://echizen.github.io/tech/2018/10-21-nginx-websocket

我眼里的 nginx
https://www.zhihu.com/column/nginxio

如何优雅地关闭worker进程？
https://blog.csdn.net/qq_27276045/article/details/103645876
https://blog.csdn.net/error311/article/details/104712237
https://cloud.tencent.com/developer/article/1558426

一次百万长连接压测Nginx内存溢出问题
https://www.51cto.com/article/612789.html

DevOps nginx: worker process is shutting down 原因解析
https://www.dazhuanlan.com/freelock/topics/1500064

nginx处理websocket连接
https://blog.csdn.net/weixin_43931358/article/details/111039750

NGINX as a WebSocket Proxy
https://www.nginx.com/blog/websocket-nginx

Nginx does not shut down when websocket connections are still open
https://github.com/phusion/passenger/issues/2211

nginx的graceful shutdown和worker shutdown timeout
https://cloud.tencent.com/developer/article/1162090

worker_shutdown_timeout 指令
https://www.hxstrive.com/subject/nginx.htm?id=785&p=757

关于k8s下使用Ingress保持长连接的异常情况排查
https://blog.jobshen.com/posts/eee2bd13.html

nginx热加载时已建立的websocket连接是否中断？
https://mp.weixin.qq.com/s/Nn44qLLQmJnzH-JLu_I-VA

Nginx reload了，连接怎么办？
https://mp.weixin.qq.com/s/i7DBCKF-ZouBihFEZKB6YQ

worker_shutdown_timeout" directive did not work websocket
https://github.com/Miss-you/apisix-book/issues/57

worker_shutdown_timeout(seconds) - Set the timeout for worker shutdown
https://docs.contrastsecurity.com/en/configure-with-puma.html