1.supervisor简介
#Supervisor是用Python开发的一套通用的进程管理程序，能将一个普通的命令行进程变为后台daemon，并监控进程状态，异常退出时能自动重启。它是通过fork/exec的方式把这些被管理的进程当作supervisor的子进程来启动，这样只要在supervisor的配置文件中，把要管理的进程的可执行文件的路径写进去即可。也实现当子进程挂掉的时候，父进程可以准确获取子进程挂掉的信息的，可以选择是否自己启动和报警。
2.supervisor安装
[root@localhost cenborder]#yum install -y epel-release
[root@localhost cenborder]# yum list |grep supervisor
supervisor.noarch 3.4.0-1.el7 @epel
nodejs-supervisor.noarch 0.6.0-2.el7 epel
[root@localhost cenborder]# yum install -y supervisor.noarch
[root@localhost cenborder]# systemctl enable --now supervisord.service
Created symlink from /etc/systemd/system/multi-user.target.wants/supervisord.service to /usr/lib/systemd/system/supervisord.service.
[root@localhost cenborder]# systemctl status supervisord.service
● supervisord.service - Process Monitoring and Control Daemon
Loaded: loaded (/usr/lib/systemd/system/supervisord.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2023-01-05 17:32:36 CST; 2s ago
Process: 11343 ExecStart=/usr/bin/supervisord -c /etc/supervisord.conf (code=exited, status=0/SUCCESS)
Main PID: 11346 (supervisord)
Tasks: 1
Memory: 11.2M
CGroup: /system.slice/supervisord.service
└─11346 /usr/bin/python /usr/bin/supervisord -c /etc/supervisord.conf
Jan 05 17:32:36 localhost.localdomain systemd[1]: Starting Process Monitoring and Control Daemon...
Jan 05 17:32:36 localhost.localdomain systemd[1]: Started Process Monitoring and Control Daemon.
[root@localhost cenborder]# cat /etc/supervisord.conf
; Sample supervisor config file.
[unix_http_server]
file=/var/run/supervisor/supervisor.sock ; (the path to the socket file)//unix socket文件
;chmod=0700 ; sockef file mode (default 0700)
;chown=nobody:nogroup ; socket file uid:gid owner
;username=user ; (default is no username (open server))
;password=123 ; (default is no password (open server))
;[inet_http_server] ; inet (TCP) server disabled by default //http服务器，提供web管理界面
;port=127.0.0.1:9001 ; (ip_address:port specifier, *:port for all iface) //监听ip和端口
;username=user ; (default is no username (open server)) //登录管理后台的用户名
;password=123 ; (default is no password (open server)) //登录管理后台的密码
[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=/var/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)
;umask=022 ; (process file creation umask;default 022)
;user=chrism ; (default is current user, required if root)
;identifier=supervisor ; (supervisord identifier, default is 'supervisor')
;directory=/tmp ; (default is not to cd during start)
;nocleanup=true ; (don't clean up tempfiles at start;default false)
;childlogdir=/tmp ; ('AUTO' child log dir, default $TEMP)
;environment=KEY=value ; (key value pairs to add to environment)
;strip_ansi=false ; (strip ansi escape codes in logs; def. false)
; 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/supervisor.sock ; use a unix:// URL for a unix socket
;serverurl=http://127.0.0.1:9001 ; use an http:// url to specify an inet socket
;两种连接方式，对应上面的[unix_http_server]和[inet_http_server]
;username=chris ; should be same as http_username if set
;password=123 ; should be same as http_password if set
;prompt=mysupervisor ; cmd line prompt (default "supervisor")
;history_file=~/.sc_history ; use readline history if available
; The below sample program section shows all possible program subsection values,
; create one or more 'real' program: sections to be able to control them under
; supervisor.
;[program:theprogramname]
;command=/bin/cat ; 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=/tmp ; 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)
; The below sample eventlistener section shows all possible
; eventlistener subsection values, create one or more 'real'
; eventlistener: sections to be able to handle event notifications
; sent by supervisor.
;[eventlistener:theeventlistenername]
;command=/bin/eventlistener ; 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)
;events=EVENT ; event notif. types to subscribe to (req'd)
;buffer_size=10 ; event buffer queue size (default 10)
;directory=/tmp ; directory to cwd to before exec (def no cwd)
;umask=022 ; umask for process (default None)
;priority=-1 ; the relative start priority (default -1)
;autostart=true ; start at supervisord start (default: true)
;autorestart=unexpected ; restart at unexpected quit (default: unexpected)
;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_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 ; # of stderr logfile backups (default 10)
;stderr_events_enabled=false ; emit events on stderr writes (default false)
;environment=A=1,B=2 ; process environment additions
;serverurl=AUTO ; override serverurl computation (childutils)
; The below sample group section shows all possible group values,
; create one or more 'real' group: sections to create "heterogeneous"
; process groups.
;[group:thegroupname]
;programs=progname1,progname2 ; each refers to 'x' in [program:x] definitions
;priority=999 ; the relative start priority (default 999)
; 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 = supervisord.d/*.ini
3.打开web管理界面
[root@localhost cenborder]# ss -tanl |grep 9001
LISTEN 0 1024 *:19001 *:*
LISTEN 0 1024 :::19001 :::*
[root@localhost cenborder]# vi /etc/supervisord.conf
[inet_http_server]
port=127.0.0.1:9001
username=user
password=123
[root@localhost cenborder]# systemctl restart supervisord.service
[root@localhost cenborder]# ss -tanl |grep 9001
LISTEN 0 1024 127.0.0.1:9001 *:*
LISTEN 0 1024 *:19001 *:*
LISTEN 0 1024 :::19001 :::*
[root@localhost cenborder]# curl localhost:9001
<head>
<title>Error response</title>
</head>
<body>
<h1>Error response</h1>
<p>Error code 401.
<p>Message: Unauthorized.
</body>
[root@localhost cenborder]# curl user:123@localhost:9001
...
No programs to manage</form>
...
4.编辑redis服务的子配置文件
[root@localhost cenborder]# vi /etc/supervisord.d/redis.ini
[program:redis-server]
command=/usr/bin/redis-server /apps/redis/etc/redis.conf
priority=999 ; 优先级（越小越优先）
autostart=true ; supervisord启动时，该程序也启动
autorestart=true ; 异常退出时，自动启动
startsecs=10 ; 启动后持续10s后未发生异常，才表示启动成功
startretries=3 ; 异常后，自动重启次数
exitcodes=0,2 ; exit异常抛出的是0、2时才认为是异常
stopsignal=QUIT ; 杀进程的信号
stopwaitsecs=10
user=redis ; 设置启动该程序的用户
log_stdout=true ; 如果为True，则记录程序日志
log_stderr=false ; 如果为True，则记录程序错误日志
logfile=/apps/redis/log/redis-server.log ; 程序日志路径
logfile_maxbytes=1MB ; 日志文件最大大小
logfile_backups=10 ; 日志文件最大数量
5.查看supervisorctl，验证redis是否启动
[root@localhost cenborder]# systemctl restart supervisord.service
[root@localhost cenborder]# supervisorctl
redis-server STARTING
supervisor> status
redis-server RUNNING pid 12132, uptime 0:10:39
[root@localhost cenborder]# ss -tnl |grep 6379
LISTEN 0 511 172.16.65.101:6379 *:*
[root@localhost cenborder]# redis-cli -a 123456 -h 172.16.65.101
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
172.16.65.101:6379>
6.supervisor常用命令
supervisorctl status //查看所有进程状态
supervisorctl stop redis-server //停止
supervisorctl start redis-server //启动
supervisorctl restart //重启
supervisorctl update //配置文件修改后使用该命令加载新的配置
supervisorctl reload //重新穷配置中的所有程序
说明：把es换成all可以管理配置中的所有进程。直接输入supervisorctl进入supervisorctl的shell交互界面，此时上面的命令不带supervisorctl可直接使用
7.再次查看web界面
</html>[root@localhost cenborder]# curl user:123@localhost:9001
...
<ul>
<li>
<a href="index.html?processname=redis-server&action=restart" name="Restart">Restart</a>
</li>
<li>
<a href="index.html?processname=redis-server&action=stop" name="Stop">Stop</a>
</li>
<li>
<a href="index.html?processname=redis-server&action=clearlog" name="Clear Log">Clear Log</a>
</li>
<li>
<a href="logtail/redis-server" name="Tail -f" target="_blank">Tail -f</a>
</li>
</ul>
...