使用supervisor工具对我们的非daemon程序做保活，当我们的进程崩溃了或被误杀了后能再次被自动拉起。
CentOS 安装 supervisor
$yum install supervisor -y
安装完成后，使用如下命令生成默认配置文件/etc/supervisord.conf：
$echo_supervisord_conf > /etc/supervisord.conf
该默认配置文件相当于是supervisor的示例配置，大部分配置都以注释的形式包含在里面了（supervisor配置文件中以分号;开始的为注释），我们可以把它当成一个小型文档来查阅。
编辑配置文件，在尾部加入如下内容，表示supervisor将读取 /etc/supervisord.d/ 下的ini文件：
[include]
files = /etc/supervisord.d/*.ini
我们的demo应用
使用shell脚本编写一个测试用的demo应用，功能是每间隔1秒向/tmp/demo.log中写入一行日志，日志内容为当前时间加上demo自身的进程号，30秒后正常退出。代码如下：
#!/bin/bash
for ((i=1; i<=30; i ++))
do
echo `date`, $$ >> /tmp/demo.log
sleep 1
done
向supervisor添加我们的demo应用
创建我们demo应用的配置
$touch /etc/supervisord.d/demo.ini
写入如下内容（假设我们刚才的demo脚本存放在/tmp/路径下）：
[program:demo]
command=sh /tmp/demo.sh
启动supervisor
$service supervisord start
# 检查supervisord进程是否运行
$ps -ef | grep supervisord
# 输出如下信息，表示supervisord启动成功
# root 17659 1 0 10:15 ? 00:00:00 /usr/bin/python /usr/bin/supervisord -c /etc/supervisord.conf
# 检查demo进程是否运行
$ps -ef | grep demo.sh
经测试：
- demo进程在运行30秒后正常退出，demo不会被重新启动
- 如果在30秒内使用
kill -9杀掉demo进程，demo将被重新拉起
进程退出后是否重新启动与autorestart、exitcodes两个配置项相关：
- 如果
autorestart为true，则不管进程退出时exit code（程序退出码）是多少，都会重新启动 - 如果
autorestart为false，则不管进程退出时exit code是多少，都不会重新启动 - 如果
autorestart为unexpected，则进程退出后，如果exit code为exitcodes配置的值，则不重新启动，反之则重新启动
autorestart的默认值为unexpected；exitcodes的默认值为0
如果我们想让被管理的进程在任何情况下退出后都被重新启动（比如我们的demo在运行30秒后会正常退出，我们希望它退出后继续启动，一直循环），则修改/etc/supervisord.d/demo.ini成如下：
[program:demo]
command=sh /tmp/demo.sh
autorestart=true
停止supervisor
$service supervisord stop
注意，停止supervisord时，我们的demo进程也会随之结束运行。
使用supervisor操作它所管理的任务
# 查看所有任务的状态
$supervisorctl status all
# 输出信息如下：
# demo RUNNING pid 19810, uptime 0:00:13
# 停止一个任务
$supervisorctl stop demo
# 开启一个任务
$supervisorctl start demo
# 重启一个任务
$supervisorctl restart demo
其它
- supervisord的设置 - http://supervisord.org/configuration.html#supervisord-section-settings
- 具体单个应用的设置 - http://supervisord.org/configuration.html#program-x-section-settings
最后贴上默认配置文件
; Sample supervisor config file.
;
; For more information on the config file, please see:
; http://supervisord.org/configuration.html
;
; Notes:
; - Shell expansion ("~" or "$HOME") is not supported. Environment
; variables can be expanded using this syntax: "%(ENV_HOME)s".
; - Comments must have a leading space: "a=b ;comment" not "a=b;comment".
[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 ; (num of main logfile rotation backups;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)
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:///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 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=unexpected ; whether/when to restart (default: unexpected)
;startsecs=1 ; 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)
;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 (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 ; whether/when to restart (default: unexpected)
;startsecs=1 ; 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)
;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 (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 = /etc/supervisord.d/*.ini
原文链接： https://pengrl.com/p/64791/
原文出处： yoko blog (https://pengrl.com)
原文作者： yoko (https://github.com/q191201771)
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