supervisor管理进程,是通过fork/exec的方式将这些被管理的进程当作supervisor的子进程来启动,所以我们只需要将要管理进程的可执行文件的路径添加到supervisor的配置文件中就好了。此时被管理进程被视为supervisor的子进程,若该子进程异常中断,则父进程可以准确的获取子进程异常中断的信息,通过在配置文件中设置autostart=ture,可以实现对异常中断的子进程的自动重启。
$ sudo apt-get install supervisor
安装完supervisor后,输入以下命令可得到配置文件:
$ echo_supervisord_conf
或者:
$ cat /etc/supervisord/supervisord.conf
配置文件如下(分号;表示注释):
; 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
以上配置文件用到几个部分:
示例如下,在目录/etc/supervisor/conf.d/下创建awesome.conf,并加入:
;/etc/supervisor/conf.d/awesome.conf
[program:awesome]
command = /usr/bin/env python3 /srv/awesome/www/app.py
directory = /srv/awesome/www
user = www-data
startsecs = 3
redirect_stderr = true
stdout_logfile_maxbytes = 50MB
stdout_logfile_backups = 10
stdout_logfile = /srv/awesome/log/app.log
配置完后,先进入/srv/awesome/目录下创建log目录,之后启动supervisor:
$ sudo supervisord -c supervisor.conf
supervisor基本命令(后四个命令可以省略“-c supervisor.conf”):
supervisord -c supervisor.conf 通过配置文件启动supervisor
supervisorctl -c supervisor.conf status 查看状态
supervisorctl -c supervisor.conf reload 重新载入配置文件
supervisorctl -c supervisor.conf start [all]|[x] 启动所有/指定的程序进程
supervisorctl -c supervisor.conf stop [all]|[x] 关闭所有/指定的程序进程
执行服务(运行app.py):
$ sudo supervisorctl start awesome
如果supervisor遇到错误,可以在/var/log/supervisor/supervisord.log中查看日志; 如果app运行出现问题,可以在/srv/awesome/log/app.log中查看日志。