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。
