如何优雅的退出/关闭/重启gunicorn进程

本文介绍了一种有效的方法来终止Gunicorn进程。首先,通过执行特定命令获取Gunicorn进程树,找到主进程。然后,使用kill-HUP命令重启Gunicorn任务,仅保留主进程并创建新的工作进程。最后,使用kill-9命令彻底退出Gunicorn任务。

转载:http://www.chenxm.cc/article/561.html
在工作中,会发现gunicorn启动的web服务,无论怎么使用kill -9 进程号都是无法杀死gunicorn,经过我一番百度和谷歌,发现想要删除gunicorn进程其实很简单。

第一步获取Gunicorn进程树:

通过执行如下命令,可以获取Gunicorn进程树:

pstree -ap|grep gunicorn

得到的结果如下

|-grep,6194 --col gunicorn
  |   `-gunicorn,30080 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,4413 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,8030 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,8135 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,8137 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,11532 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,13460 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,19728 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,23585 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,23825 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,27921 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,28899 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,28900 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,28901 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,35637 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,36963 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,43074 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,43118 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,43232 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,43307 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,43308 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,44018 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,46996 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       |-gunicorn,47000 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py
  |       `-gunicorn,47650 /usr/local/bin/gunicorn collect:app -c collect_gunicorn.py

很显然,30080就是Gunicorn的主进程。

2. 重启Gunicorn任务

kill -HUP 30080

执行上述命令后,再次执行“pstree -ap|grep gunicorn”,我们很容易发现,除了主进程,其他的Gunicorn进程都已经销毁,并新建了进程(进程ID发生了变化)。

3. 退出Gunicorn任务

kill -9 30080
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