#Supervisor是什么 >Supervisor is a client/server system that allows its users to monitor and control a number of processes on UNIX-like operating systems.

Supervisor是用Python实现的一款实用的进程管理工具。Supervisor会帮你把管理的应用程序转成daemon程序,而且可以方便的通过命令开启、关闭、重启进程等操作,而且它管理的进程一旦崩溃会自动重启,这样就可以保证程序执行中断后的情况下有自我修复的功能。

#安装与配置 Supervisor本质上是个python包,安装很简易:sudo pip install supervisor

##配置文件 运行echo_supervisord_conf,会输出一个模板,修修改改就可用了。 将其写入文件:sudo echo_supervisord_conf > supervisord.conf
如果没有root权限,可以将配置文件写在本地,之后用-c参数来指定配置文件: supervisord -c supervisord.conf。推荐做法是将配置文件写到/etc/supervisord.conf

###生成默认配置文件(推荐做法)

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echo_supervisord_conf > /etc/supervisord.conf
mkdir /etc/supervisord.conf.d

每个需要管理的进程分别写在一个文件里面,放在/etc/supervisord.conf.d/目录下,便于管理。修改配置文件,include区段修改为

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:::text
[include]
files = /etc/supervisord.conf.d/*.conf

如需要访问web控制界面,inet_http_server区段修改为

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:::text
[inet_http_server]
port=0.0.0.0:9001
username=username 
password=password 

修改后需要supervisorctl reload (载入最新的配置文件,并按新的配置启动、管理所有进程。)

开机自启

将supervisord加入系统服务,文件:/etc/init.d/supervisord

简单的方法是往/etc/rc.local加入/usr/local/bin/supervisord

##使用 * Supervisord安装完成后有两个可用的命令行supervisorsupervisorctl
* supervisord:初始启动Supervisord,启动、管理配置中设置的进程: 启动supervisord:supervisord -c /etc/supervisord.conf
* supervisorctl stop programxxx,停止某一个进程(programxxx),programxxx为[program:programxxx]里配置的值。stop可替换为start/restart/reload

##edX中(Cypress版本) ####Shutdown the lms and cms:

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:::text
sudo /edx/bin/supervisorctl  
> stop edxapp: edxapp_worker:

####See what services are running sudo /edx/bin/supervisorctl status

####Restarting Services LMS/CMS : sudo /edx/bin/supervisorctl restart edxapp:
Workers : sudo /edx/bin/supervisorctl restart edxapp_worker:

####stop everything except the LMS and CMS sudo /edx/bin/supervisorctl stop discern discern_celery forum ora ora_celery xqueue xqueue_consumer xserver edxapp_worker:

###edx中相关配置文件 搜索sudo find / -name *supervisord*。观察发现lms和cms相关的配置文件在/edx/app/supervisor/supervisord.conf , /edx/app/supervisor/conf.d/*.conf

其中lms的配置文件为

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:::text
[program:lms]

command=/edx/app/edxapp/venvs/edxapp/bin/gunicorn -c /edx/app/edxapp/lms_gunicorn.py lms.wsgi

user=www-data
directory=/edx/app/edxapp/edx-platform
environment=PORT=8000,ADDRESS=127.0.0.1,LANG=en_US.UTF-8,DJANGO_SETTINGS_MODULE=lms.envs.aws,SERVICE_VARIANT="lms",PATH="/edx/app/edxapp/venvs/edxapp/bin:/edx/app/edxapp/edx-plat
form/bin:/edx/app/edxapp/.rbenv/bin:/edx/app/edxapp/.rbenv/shims:/edx/app/edxapp/.gem/bin:/edx/app/edxapp/edx-platform/node_modules/.bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
stdout_logfile=/edx/var/log/supervisor/%(program_name)s-stdout.log
stderr_logfile=/edx/var/log/supervisor/%(program_name)s-stderr.log
killasgroup=true
stopasgroup=true

##参考资料 * Supervisor: A Process Control System * Supervisor安装及配置