简介

centos有自带的supervisor，可以通过yum直接安装。

安装

在CentOS7上可以直接安装，在CentOS Stream上可以通过epel-release安装。

yum -y install supervisor

服务

CentOS7以上的版本都是使用systemd进行服务管理

systemctl enable supervisord
systemctl start supervisord

配置

默认配置文件是/etc/supervisord.conf

[unix_http_server]
file=/run/supervisor/supervisor.sock   ; (the path to the socket file)

[supervisord]
logfile=/var/log/supervisor/supervisord.log  ; (main log file;default $CWD/supervisord.log)
logfile_maxbytes=50MB       ; (max main logfile bytes b4 rotation;default 50MB)
logfile_backups=10          ; (num of main logfile rotation backups;default 10)
loglevel=info               ; (log level;default info; others: debug,warn,trace)
pidfile=/run/supervisord.pid ; (supervisord pidfile;default supervisord.pid)
nodaemon=false              ; (start in foreground if true;default false)
minfds=1024                 ; (min. avail startup file descriptors;default 1024)
minprocs=200                ; (min. avail process descriptors;default 200)

[rpcinterface:supervisor]
supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface

[supervisorctl]
serverurl=unix:///run/supervisor/supervisor.sock ; use a unix:// URL  for a unix socket

[include]
files = supervisord.d/*.ini
[root@centos8 ~]# cat /etc/supervisord.conf  | grep -v '^;'  | grep -v '^$'
[unix_http_server]
file=/run/supervisor/supervisor.sock   ; (the path to the socket file)
[supervisord]
logfile=/var/log/supervisor/supervisord.log  ; (main log file;default $CWD/supervisord.log)
logfile_maxbytes=50MB       ; (max main logfile bytes b4 rotation;default 50MB)
logfile_backups=10          ; (num of main logfile rotation backups;default 10)
loglevel=info               ; (log level;default info; others: debug,warn,trace)
pidfile=/run/supervisord.pid ; (supervisord pidfile;default supervisord.pid)
nodaemon=false              ; (start in foreground if true;default false)
minfds=1024                 ; (min. avail startup file descriptors;default 1024)
minprocs=200                ; (min. avail process descriptors;default 200)
[rpcinterface:supervisor]
supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface
[supervisorctl]
serverurl=unix:///run/supervisor/supervisor.sock ; use a unix:// URL  for a unix socket
[include]
files = supervisord.d/*.ini

可以直接修改这个配置直接加promgram管理程序

也可以放到/etc/supervisord.d/*.ini这个目录里面，独立文件方便拷贝管理。

vim /etc/supervisord.d/demo.ini

[program:demo]
command=/usr/local/demo/demo              ; the program (relative uses PATH, can take args)
;process_name=%(program_name)s ; process_name expr (default %(program_name)s)
;numprocs=1                    ; number of processes copies to start (def 1)
directory=/usr/local/demo               ; directory to cwd to before exec (def no cwd)
;umask=022                     ; umask for process (default None)
;priority=999                  ; the relative start priority (default 999)
;autostart=true                ; start at supervisord start (default: true)
;autorestart=true              ; retstart at unexpected quit (default: true)
;startsecs=10                  ; number of secs prog must stay running (def. 1)
;startretries=3                ; max # of serial start failures (default 3)
;exitcodes=0,2                 ; 'expected' exit codes for process (default 0,2)
;stopsignal=QUIT               ; signal used to kill process (default TERM)
;stopwaitsecs=10               ; max num secs to wait b4 SIGKILL (default 10)
;user=chrism                   ; setuid to this UNIX account to run the program
;redirect_stderr=true          ; redirect proc stderr to stdout (default false)
;stdout_logfile=/a/path        ; stdout log path, NONE for none; default AUTO
;stdout_logfile_maxbytes=1MB   ; max # logfile bytes b4 rotation (default 50MB)
;stdout_logfile_backups=10     ; # of stdout logfile backups (default 10)
;stdout_capture_maxbytes=1MB   ; number of bytes in 'capturemode' (default 0)
;stdout_events_enabled=false   ; emit events on stdout writes (default false)
;stderr_logfile=/a/path        ; stderr log path, NONE for none; default AUTO
;stderr_logfile_maxbytes=1MB   ; max # logfile bytes b4 rotation (default 50MB)
;stderr_logfile_backups=10     ; # of stderr logfile backups (default 10)
;stderr_capture_maxbytes=1MB   ; number of bytes in 'capturemode' (default 0)
;stderr_events_enabled=false   ; emit events on stderr writes (default false)
;environment=A=1,B=2           ; process environment additions (def no adds)
;serverurl=AUTO                ; override serverurl computation (childutils)

配置好程序路径就可以加载到任务了。

任务管理

可以通过supervisorctl进行任务控制

supervisorctl status   #查看进程运行状态
supervisorctl start 进程名 #启动进程
supervisorctl stop 进程名 #关闭进程
supervisorctl restart 进程名 #重启进程
supervisorctl shutdown #关闭supervisord
supervisorctl reread  #重新载入配置文件
supervisorctl reload  #重新载入配置并重启

句柄不够

在一些高并发的程序可能出现句柄不够用的情况，可以通过编辑supervisord.service文件修改句柄数。

vim /usr/lib/systemd/system/supervisord.service

[Unit]
Description=Process Monitoring and Control Daemon
After=rc-local.service

[Service]
LimitNOFILE=40960
LimitNPROC=40960
Type=forking
ExecStart=/usr/bin/supervisord -c /etc/supervisord.conf
RuntimeDirectory=supervisor
RuntimeDirectoryMode=755

[Install]
WantedBy=multi-user.target

修改之后需要重启服务生效

systemctl daemon-reload
systemctl restart supervisord

总结

使用supervisor可以让我们快速管理服务，特别是部署Go程序的时候很方便。