bash 主管停止子进程
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supervisord stopping child processes
提问by FUD
One of the problems, I face with supervisord is that when I have a command which in turn spawns another process, supervisord is not able to kill it.
我在使用 supervisord 时面临的一个问题是，当我有一个命令反过来产生另一个进程时，supervisord 无法杀死它。
For example I have a java process which when runs normally is like
例如，我有一个 java 进程，正常运行时就像
$ zkServer.sh start-foreground
$ ps -eaf | grep zk
user 30404 28280 0 09:21 pts/2 00:00:00 bash zkServer.sh start-foreground
user 30413 30404 76 09:21 pts/2 00:00:10 java -Dzookeeper.something..something
The supervisord config file looks like:
supervisord 配置文件如下所示：
[program:zookeeper]
command=zkServer.sh start-foreground
autorestart=true
stopsignal=KILL
These kind of processes which have multiple childs are not well handled by supervisord when it comes to stopping them from supervisorctl. So when I run this from the supervisord and try to stop it from supervisorctl, only the top level process gets killed but not the actual java process.
在阻止它们从supervisorctl. 因此，当我从 supervisord 运行它并尝试从 supervisorctl 中停止它时，只有顶级进程被杀死，而不是实际的 java 进程。
回答by kuzavas
The same problem was encountered by Rick Hanlon II here: https://coderwall.com/p/4tcw7w
Rick Hanlon II 在这里遇到了同样的问题：https: //coderwall.com/p/4tcw7w
Option stopasgroup=trueshould be set in the program section for supervisord to stop not only the parent process but also the child processes.
选项stopasgroup=true应该在程序部分设置为 supervisord 不仅停止父进程，而且停止子进程。
The example is given as:
示例如下：
[program:some_django]
command=python manage.py runserver
directory=/dir/to/app
stopasgroup=true
Also, have in mind that you may have an older package of supervisord that does not have "stopasgroup" functionality. I tried these Debian packages on Raspberry Pi:
另外，请记住，您可能有一个较旧的 supervisord 包，它没有“stopasgroup”功能。我在 Raspberry Pi 上尝试了这些 Debian 软件包：
- supervisor_3.0a8 does not work.
- supervisor_3.0b2-1 works as expected.
- supervisor_3.0a8 不起作用。
- supervisor_3.0b2-1 按预期工作。
回答by Fred Yankowski
Doing the following early in the main bash script called by supervisord fixed the problem for me:
在由 supervisord 调用的主 bash 脚本早期执行以下操作为我解决了问题：
trap "kill -- -$$" EXIT
This kills the entire process group when the main script exits, such as when it is killed by supervisord.
这会在主脚本退出时杀死整个进程组，例如当它被 supervisord 杀死时。
回答by Roger Hoover
A feature was recently added to supervisord to send SIGKILL to the whole process group. It's in githubbut not officially released yet.
最近在 supervisord 中添加了一个功能，将 SIGKILL 发送到整个进程组。它在github 中，但尚未正式发布。
If the process id is available in a file, you can use the pid-proxy program
如果进程 id 在文件中可用，则可以使用pid-proxy 程序
回答by Andreas Veithen
The following article has an in-depth discussion of the problem:
以下文章对该问题进行了深入讨论：
http://veithen.github.io/2014/11/16/sigterm-propagation.html
http://veithen.github.io/2014/11/16/sigterm-propagation.html
回答by Color
try this supervisor program config:
试试这个主管程序配置：
stopasgroup=true
killasgroup=true
stopsignal=INT
回答by baqx0r
You can also use priorities in /conf.d/your-configuration.conffile. For example, if you want to run zookeeper first and then kafka you can specify two programs.
您还可以在/conf.d/your-configuration.conf文件中使用优先级。例如，如果您想先运行zookeeper，然后运行kafka，则可以指定两个程序。
Lower priority means that the program starts first and stops last.
较低的优先级意味着程序首先启动，最后停止。
