http://zhangweide.cn/archive/2013/supervisor-note.html
Supervisord
supervisord的出现，结束了我这苦恼的问题，它可以帮你守护任何进程，当然如果它的进程也挂了就全都over了。实际情况是上线三个多月运行非常好，没有发现进程掉过。
CentOS下安装Supervisord
# yum install python-setuptools
# easy_install supervisor
创建配置文件
# echo_supervisord_conf > /etc/supervisord.conf
修改配置文件
# vi /etc/supervisord.conf
在末尾添加
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[program:chat]command=python /data0/htdocs/chat/main.pypriority=1numprocs=1autostart=trueautorestart=true |
配置说明：
command 要执行的命令
priority 优先级
numprocs 启动几个进程
autostart supervisor启动的时候是否随着同时启动
autorestart 当程序over的时候，这个program会自动重启，一定要选上
启动Supervisord
# supervisord
查看帮助
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[root@localhost core]# supervisord --helpsupervisord -- run a set of applications as daemons.Usage: /usr/bin/supervisord [options]Options:-c/--configuration FILENAME -- configuration file-n/--nodaemon -- run in the foreground (same as 'nodaemon true' in config file)-h/--help -- print this usage message and exit-v/--version -- print supervisord version number and exit-u/--user USER -- run supervisord as this user (or numeric uid)-m/--umask UMASK -- use this umask for daemon subprocess (default is 022)-d/--directory DIRECTORY -- directory to chdir to when daemonized-l/--logfile FILENAME -- use FILENAME as logfile path-y/--logfile_maxbytes BYTES -- use BYTES to limit the max size of logfile-z/--logfile_backups NUM -- number of backups to keep when max bytes reached-e/--loglevel LEVEL -- use LEVEL as log level (debug,info,warn,error,critical)-j/--pidfile FILENAME -- write a pid file for the daemon process to FILENAME-i/--identifier STR -- identifier used for this instance of supervisord-q/--childlogdir DIRECTORY -- the log directory for child process logs-k/--nocleanup -- prevent the process from performing cleanup (removal of old automatic child log files) at startup.-a/--minfds NUM -- the minimum number of file descriptors for start success-t/--strip_ansi -- strip ansi escape codes from process output--minprocs NUM -- the minimum number of processes available for start success--profile_options OPTIONS -- run supervisord under profiler and output results based on OPTIONS, which is a comma-sep'd list of 'cumulative', 'calls', and/or 'callers', e.g. 'cumulative,callers') |
启动时指定配置文件
# supervisord -c /etc/supervisord.conf
进入ctl模式
# supervisorctl
ctl中的简单命令
help 查看命令帮助
status 查看状态
stop XXX 停止某一个进程
start XXX 启动某个进程
restart XXX 重启某个进程
reload 载入最新的配置文件，停止原有进程并按新的配置启动、管理所有进程
update 根据最新的配置文件，启动新配置或有改动的进程，配置没有改动的进程不会受影响而重启。
测试
这里以守护nginx进程来演示，首先在/etc/supervisord.conf加入
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[program:nginx]command=/usr/local/nginx/sbin/nginxpriority=1numprocs=1autostart=trueautorestart=true |
然后启动supervisord
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[root@localhost core]# supervisord -c /etc/supervisord.conf [root@localhost core]# ps -le | grep supervisord 1 S 0 14035 1 0 80 0 - 48722 poll_s ? 00:00:00 supervisord |
查看nginx的进程
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[root@localhost core]# ps -le | grep nginx1 S 0 14037 1 0 80 0 - 56260 rt_sig ? 00:00:00 nginx5 S 99 14038 14037 0 80 0 - 56363 ep_pol ? 00:00:00 nginx5 S 99 14039 14037 0 80 0 - 56300 ep_pol ? 00:00:00 nginx5 S 99 14040 14037 0 80 0 - 56300 ep_pol ? 00:00:00 nginx |
杀掉nginx进程
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[root@localhost core]# kill -9 14037 |
然后接着重新查看nginx进程
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[root@localhost core]# ps -le | grep nginx5 S 99 14038 1 0 80 0 - 56363 ep_pol ? 00:00:00 nginx5 S 99 14039 1 0 80 0 - 56300 ep_pol ? 00:00:00 nginx4 S 0 14456 14035 0 80 0 - 56259 hrtime ? 00:00:00 nginx |
起死回生了，并且pid已经由14037变成14038。搞定！
通过web管理
supervisord可以通过web管理进程以及查看进程状态，需要在配置文件里开启
找到[inet_http_server]这一段，修改成
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[inet_http_server] ; inet (TCP) server disabled by defaultport=*:9001 ; (ip_address:port specifier, *:port for all iface)username=admin ; (default is no username (open server))password=123 ; (default is no password (open server)) |
其中port这个字段要各位注意，如果*:9001表示允许所有ip访问，如果指定单个IP可以 xx.xx.xx.xx:9001 这样既可。如果你开启了iptabls记得要在规则里允许port指定的端口号。
然后保存配置，重启supervisord