Supervisor的入门笔记

[pupuk]

简介

正如官网上所说：Supervisor: A Process Control System，Supervisor是一个进程管理器，可以把要监控的进程作为supervisord的子进程来运行，因为supervisord是被监控进程的父进程，所以子进程的退出，崩溃关闭，父进程可以来拿相关的信息。 所以supervisor可以实现，对管理进程的自动重启，状态日志管理，比如可以对某个shell命令或者golang编译后的二进制包，实现后台运行，自动重启，保证程序一定程度的高可用。

官网：http://supervisord.org/ Github：https://github.com/Supervisor/supervisor

安装配置

supervisor是python写的，现在可以兼容python2, python3，所以可是使用python的特色管理工具pip安装， pip install supervisor

也可以使用yum管理工具安装： yum install -y supervisor

安装就不赘述，参见http://supervisord.org/installing.html 就行，安装完成后，会生成三个二进制文件：

ll /usr/bin/*supervisor*
-rwxr-xr-x 1 root root 338 Mar 11 08:45 /usr/bin/echo_supervisord_conf
-rwxr-xr-x 1 root root 322 Mar 11 08:45 /usr/bin/supervisorctl
-rwxr-xr-x 1 root root 318 Mar 11 08:45 /usr/bin/supervisord

• echo_supervisord_conf 是用来生成缺省配置文件的，如果安装好supervisor以后，没有发现 /etc/supervisord.conf文件，则可以用echo_supervisord_conf程序来创建一个配置文件，例如： echo_supervisord_conf > /etc/supervisord.conf，此操作需要root权限；

• supervisorctl是supervisor的命令行终端，类似于mysql，redis-cli;

• supervisord是supervisor的服务程序，supervisor最重要的工作是supervisord干的；

如果/etc/supervisord.conf文件里面有

[include]
files = supervisord.d/*.ini

则可以像nginx以上，为每个单独的进程配制一个文件，放到/etc/supervisord.d/目录下，不全部写在一起，方便管理。 配置文件参考/etc/supervisord.conf就行，里面有例子，最简单的如下：

[program:golang-server]
command=/home/go/heart/main
autostart=true
autorestart=true
startsecs=10

自身管理和管理别人

supervisor是靠Linux提供的systemd来管理自己的，可是实现随Linux开机启动等； systemctl start[stop][reload][restart][status][enable][disable] supervisord.service

supervisor根据配置文件来管理别的进程，通过使用 supervisorctl终端，可以很方便管理要监控的进程：

如果不会某个命令（action），可以使用 hlep 来查看相应的说明，例如：

更详尽的 systemctl终端命令的使用可以详见下面的评论

其它

supervisor可以对进程编组，进行组管理，另外，还有信号，事件这些特色功能，这些都是值得我们深入学习的地方；

另外：其它的进程管理工具也有一些， golang版本的supervisor，https://github.com/ochinchina/supervisord nodejs生态的pm2，https://github.com/Unitech/pm2

[pupuk]

systemctl的命令简介

supervisorctl Actions help

Print a list of available actions help <action>

Print help for add <name> [...]

Activates any updates in config for process/group remove <name> [...] Removes process/group from active config update Reload config and add/remove as necessary, and will restart affected programs update all

Reload config and add/remove as necessary, and will restart affected programs update <gname> [...]

Update specific groups, and will restart affected programs clear <name>

Clear a process’ log files. clear <name> <name>

Clear multiple process’ log files clear all

Clear all process’ log files fg <process>

Connect to a process in foreground mode Press Ctrl+C to exit foreground pid

Get the PID of supervisord. pid <name>

Get the PID of a single child process by name. pid all

Get the PID of every child process, one per line. reload

Restarts the remote supervisord reread

Reload the daemon’s configuration files, without add/remove (no restarts) restart <name>

Restart a process Note: restart does not reread config files. For that, see reread and update. restart <gname>:*

Restart all processes in a group Note: restart does not reread config files. For that, see reread and update. restart <name> <name>

Restart multiple processes or groups Note: restart does not reread config files. For that, see reread and update. restart all

Restart all processes Note: restart does not reread config files. For that, see reread and update. signal

No help on signal start <name> Start a process start <gname>:*

Start all processes in a group start <name> <name>

Start multiple processes or groups start all

Start all processes status

Get all process status info. status <name>

Get status on a single process by name. status <name> <name>

Get status on multiple named processes. stop <name>

Stop a process stop <gname>:*

Stop all processes in a group stop <name> <name>

Stop multiple processes or groups stop all

Stop all processes tail [-f] <name> [stdout|stderr] (default stdout)

Output the last part of process logs Ex: tail -f Continuous tail of named process stdout Ctrl-C to exit. tail -100 last 100 bytes of process stdout tail stderr last 1600 bytes of process stderr