supervisor简介
Supervisor是用Python开发的一套通用的进程管理程序，能将一个普通的命令行进程变为后台daemon，并监控进程状态，异常退出时能自动重启。它是通过fork/exec的方式把这些被管理的进程当作supervisor的子进程来启动，这样只要在supervisor的配置文件中，把要管理的进程的可执行文件的路径写进去即可。也实现当子进程挂掉的时候，父进程可以准确获取子进程挂掉的信息的，可以选择是否自己启动和报警。supervisor还提供了一个功能，可以为supervisord或者每个子进程，设置一个非root的user，这个user就可以管理它对应的进程
安装
sudo apt-get install supervisor
配置
1.修改配置
; supervisor config file
[unix_http_server]
file=/var/run/supervisor.sock ; (the path to the socket file)
chmod=0700 ; sockef file mode (default 0700)
[supervisord]
logfile=/var/log/supervisor/supervisord.log ; (main log file;default $CWD/supervisord.log)
pidfile=/var/run/supervisord.pid ; (supervisord pidfile;default supervisord.pid)
childlogdir=/var/log/supervisor ; ('AUTO' child log dir, default $TEMP)
; the below section must remain in the config file for RPC
; (supervisorctl/web interface) to work, additional interfaces may be
; added by defining them in separate rpcinterface: sections
[rpcinterface:supervisor]
supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface
[supervisorctl]
serverurl=unix:///var/run/supervisor.sock ; use a unix:// URL for a unix socket
; The [include] section can just contain the "files" setting. This
; setting can list multiple files (separated by whitespace or
; newlines). It can also contain wildcards. The filenames are
; interpreted as relative to this file. Included files *cannot*
; include files themselves.
[include]
files = /etc/supervisor/conf.d/*.conf
2.复制
安装成功后的supervisor会在/etc下生成一个supervisor目录和supervisor.conf文件，默认/etc/supervisor.conf为空，需要将/etc/supervisor/supervisor.conf的内容复制一份到/etc/supervisor.conf中，否则启动不了。
3.编写队列配置
默认情况下，supervisor会读取/etc/supervisor/conf.d下的所有.conf文件配置
[program:laravel-echo-server]
process_name=%(program_name)s_%(process_num)02d
command = laravel-echo-server start --force
directory = /var/www/html/echo/
autostart = true
autorestart=true
user=root
numprocs=1
redirect_stderr=true
stdout_logfile_maxbytes=25MB
stderr_logfile_backups=2
查看、启动、停止、重启supervisor进程
1、更新配置后必须执行更新命令才生效
sudo supervisorctl update
2、查看supervisor进程
sudo supervisorctl status
3、启动某个supervisor进程
sudo supervisorctl start xxxx
4、停止某个supervisor进程
sudo supervisorctl stop xxxx
5、停止所有supervisor进程
sudo supervisorctl stop all
6、重启某个supervisor进程
sudo supervisorctl restart xxxx
