什么是supervisor
supervisor是一个进程管理工具，将前台运行的程序转为后台运行，并在程序异常退出时进行自动拉起。
为什么使用supervisor
针对于没有启停脚本并运行在前台的程序，使用supervisor可以自动放入后台并提供web界面进行管理并对其进行监控。
supervisor的主要组件
1.supervisord
主进程，负责管理进程的服务，对异常退出进程的拉起，对进程变化发送事件通知。
2.supervisorctl
命令行管理工具
supervisorctl status #查看所有服务状态
supervisorctl status SERVICENAME #查看单个服务状态
supervisorctl start SERVICENAME #启动服务
supervisorctl stop SERVICENAME #关闭服务
supervisorctl restart SERVICENAME #重启服务
3.web server
supervisor提供web UI进行操作，通过对supervisord.conf文件中的[inet_http_server]块进行配置。
4.XML_RPC Interface
远程调用服务，通过HTTP协议提供的web服务，用来控制supervisor以及其下运行的进程。
安装supervisor
推荐使用pip进行安装，使用yum安装版本可能较低。
#pip3安装supervisor
pip3 install supervisor
#创建配置文件目录
mkdir -p /etc/supervisor
#导入配置文件
echo_supervisord_conf > /etc/supervisor/supervisord.conf
#创建进程配置目录
mkdir -p /etc/supervisor/supervisor.d
#下载supervisor服务管理文件
wget -O /usr/lib/systemd/system/supervisord.service https://raw.githubusercontent.com/Supervisor/initscripts/master/centos-systemd-etcs
修改配置文件
主配置文件/etc/supervisor/supervisord.conf
各进程配置文件在主配置文件最后定义，如果使用绝对路径可能会识别不到。
[include]
files = ./supervisor.d/*.ini
主配置文件如下
[unix_http_server]
file=/tmp/supervisor.sock ; the path to the socket file
;chmod=0700 ; socket 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
port=127.0.0.1:9001 ; ip_address:port specifier, *:port for all iface
username=user ; default is no username (open server)
password=123 ; default is no password (open server)
[supervisord]
logfile=/tmp/supervisord.log ; main log file; default $CWD/supervisord.log
logfile_maxbytes=50MB ; max main logfile bytes b4 rotation; default 50MB
logfile_backups=10 ; # of main logfile backups; 0 means none, default 10
loglevel=info ; log level; default info; others: debug,warn,trace
pidfile=/tmp/supervisord.pid ; supervisord pidfile; default supervisord.pid
nodaemon=false ; start in foreground if true; default false
silent=false ; no logs to stdout 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=supervisord ; setuid to this UNIX account at startup; recommended 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
[rpcinterface:supervisor]
supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface
; The supervisorctl section configures how supervisorctl will connect to
; supervisord. configure it match the settings in either the unix_http_server
; or inet_http_server section.
[supervisorctl]
serverurl=unix:///tmp/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
;username=chris ; should be same as in [*_http_server] if set
;password=123 ; should be same as in [*_http_server] if set
;prompt=mysupervisor ; cmd line prompt (default "supervisor")
;history_file=~/.sc_history ; use readline history if available
;[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)
;startsecs=1 ; # of secs prog must stay up to be running (def. 1)
;startretries=3 ; max # of serial start failures when starting (default 3)
;autorestart=unexpected ; when to restart if exited after running (def: unexpected)
;exitcodes=0 ; ‘expected‘ exit codes used with autorestart (default 0)
;stopsignal=QUIT ; signal used to kill process (default TERM)
;stopwaitsecs=10 ; max num secs to wait b4 SIGKILL (default 10)
;stopasgroup=false ; send stop signal to the UNIX process group (default false)
;killasgroup=false ; SIGKILL the UNIX process group (def false)
;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 (0 means none, default 10)
;stdout_capture_maxbytes=1MB ; number of bytes in ‘capturemode‘ (default 0)
;stdout_events_enabled=false ; emit events on stdout writes (default false)
;stdout_syslog=false ; send stdout to syslog with process name (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 (0 means none, default 10)
;stderr_capture_maxbytes=1MB ; number of bytes in ‘capturemode‘ (default 0)
;stderr_events_enabled=false ; emit events on stderr writes (default false)
;stderr_syslog=false ; send stderr to syslog with process name (default false)
;environment=A="1",B="2" ; process environment additions (def no adds)
;serverurl=AUTO ; override serverurl computation (childutils)
;[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_sizenet HTTP server is
; enabled by uncommenting the [inet_http_serv=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)
;startsecs=1 ; # of secs prog must stay up to be running (def. 1)
;startretries=3 ; max # of serial start failures when starting (default 3)
;autorestart=unexpected ; autorestart if exited after running (def: unexpected)
;exitcodes=0 ; ‘expected‘ exit codes used with autorestart (default 0)
;stopsignal=QUIT ; signal used to kill process (default TERM)
;stopwaitsecs=10 ; max num secs to wait b4 SIGKILL (default 10)
;stopasgroup=false ; send stop signal to the UNIX process group (default false)
;killasgroup=false ; SIGKILL the UNIX process group (def false)
;user=chrism ; setuid to this UNIX account to run the program
;redirect_stderr=false ; redirect_stderr=true is not allowed for eventlisteners
;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 (0 means none, default 10)
;stdout_events_enabled=false ; emit events on stdout writes (default false)
;stdout_syslog=false ; send stdout to syslog with process name (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 (0 means none, default 10)
;stderr_events_enabled=false ; emit events on stderr writes (default false)
;stderr_syslog=false ; send stderr to syslog with process name (default false)
;environment=A="1",B="2" ; process environment additions
;serverurl=AUTO ; override serverurl computation (childutils)
;[group:thegroupname]
;programs=progname1,progname2 ; each refers to ‘x‘ in [program:x] definitions
;priority=999 ; the relative start priority (default 999)
[include]
files = ./supervisor.d/*.ini
各被管理进程配置如下（以django项目为例）
[program:django-python]
；项目目录
direct=/usr/local/bin/demosite
；启动进程命令
command=/bin/bash -c "python3 /usr/local/bin/demosite/manage.py runserver 0.0.0.0:8002"
；是否自动启动
autostart=true
；是否自动重启
autorestart=true
stdout_logfile=/var/log/django_stdout.log
stderr_logfile=/var/log/django_stderr.log
user=root
stopsignal=TERM
startsecs=5
startretries=3
stopasgroup=true
killasgroup=true