最近的PHP项目中，需要用到常驻后台的脚本，使用Supervisor管理进程，可以实现对异常中断的子进程的自动重启，省去自己写守护进程，非常的方便，在此与大家分享。

1安装supervisor

yum install -y supervisor

2配置文件

vim /etc/supervisord.conf

配置文件如下：

; Sample supervisor config file.

[unix_http_server]
file=/var/run/supervisor/supervisor.sock   ; (the path to the socket file)
;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
;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=/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              ; (do not 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
;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   //在supervisord.d 文件夹下 建立xxx.ini文件 对应一个program

以上配置文件用到几个部分：

• [unix_http_server]：这部分设置HTTP服务器监听的UNIX domain socket

  file: 指向UNIX domain socket，即file=/var/run/supervisor.sock
  chmod：启动时改变supervisor.sock的权限

• [supervisord]：与supervisord有关的全局配置需要在这部分设置

  logfile: 指向记录supervisord进程的log文件
  pidfile：pidfile保存子进程的路径
  childlogdir：子进程log目录设为AUTO的log目录

• [supervisorctl]：

  serverurl：进入supervisord的URL， 对于UNIX domain sockets, 应设为 unix:///absolute/path/to/file.sock

• [include]：如果配置文件包含该部分，则该部分必须包含一个files键：

  files：包含一个或多个文件，这里包含了/etc/supervisor/conf.d/目录下所有的.conf文件，可以在该目录下增加我们自己的配置文件，在该配置文件中增加[program:x]部分，用来运行我们自己的程序，如下：

• [program:x]：配置文件必须包括至少一个program，x是program名称，必须写上，不能为空

  command：包含一个命令，当这个program启动时执行
  directory：执行子进程时supervisord暂时切换到该目录
  user：账户名
  startsecs：进程从STARING状态转换到RUNNING状态program所需要保持运行的时间（单位：秒）
  redirect_stderr：如果是true，则进程的stderr输出被发送回其stdout文件描述符上的supervisord
  stdout_logfile：将进程stdout输出到指定文件
  stdout_logfile_maxbytes：stdout_logfile指定日志文件最大字节数，默认为50MB，可以加KB、MB或GB等单位
  stdout_logfile_backups：要保存的stdout_logfile备份的数量

3示例及详细步骤

首先启动supervisord

supervisord -c /etc/supervisord.conf         通过配置文件启动supervisor

可能遇到的问题
Unlinking stale socket /var/run/supervisor/supervisor.sock
解决方法

unlink /var/run/supervisor/supervisor.sock

再次启动成功
准备一个脚本来模拟实际场景

[root@izwz9hdz8b83dgcyit9wclz test]# pwd
/data/test
[root@izwz9hdz8b83dgcyit9wclz test]# ls
demo1.sh  output.txt
[root@izwz9hdz8b83dgcyit9wclz test]# 

demo1.sh一直向output.txt写入内容
demo1.sh具体代码

#!/bin/bash
 set j=2
 while true
 do
        let "j=j+1"
        echo "---j is $j---\n" >> output.txt

        sleep 20
 done

测试文件准备完毕
接下来需要配置program
通过查看/etc/supervisord.conf 的配置文件可知

[include]
files = supervisord.d/*.ini   //在supervisord.d 文件夹下 建立xxx.ini文件 对应一个program

需要在supervisord.d/文件夹下 创建.ini为后缀的配置文件对应一个program

[root@izwz9hdz8b83dgcyit9wclz supervisord.d]# pwd
/etc/supervisord.d
[root@izwz9hdz8b83dgcyit9wclz supervisord.d]# ll
total 4
-rw-r--r-- 1 root root 427 Apr  1 16:44 demo1.sh.ini

具体配置

[program:demo1]

command          = /bin/bash demo1.sh
directory        = /data/test
user             = www-data
startsecs        = 2

autostart=true                ; start at supervisord start (default: true)
autorestart=true       ; restart at unexpected quit (default: unexpected)


redirect_stderr         = true
stdout_logfile_maxbytes = 50MB
stdout_logfile_backups  = 10
stdout_logfile          = /data/log/app.log

所有文件准备完毕
此时output.txt应该是空的
由于supervisord还没有启动直接使用配置文件（由于配置文件已经引入了刚刚配置好的program program 对应的项目会自动启动）启动supervisord
如果supervisord已经启动，应该使用supervisorctl启动指定的服务
此处先演示supervisord启动

supervisord -c /etc/supervisord.conf 

启动完毕后查看一下项目的状态

[root@izwz9hdz8b83dgcyit9wclz test]# supervisorctl status
demo1                            RUNNING   pid 13613, uptime 0:01:12
[root@izwz9hdz8b83dgcyit9wclz test]# 

可以看到demo1已经启动
查看output.txt文件

[root@izwz9hdz8b83dgcyit9wclz test]# cat output.txt 

---j is 1---\n
---j is 2---\n
---j is 3---\n
---j is 4---\n
---j is 5---\n
---j is 6---\n
---j is 7---\n
---j is 8---\n
---j is 9---\n

然后我们kill掉进程模拟 脚本崩溃

[root@izwz9hdz8b83dgcyit9wclz test]# ps -aux | grep demo1
www-data 13613  0.0  0.0 113120  1432 ?        S    09:58   0:00 /bin/bash demo1.sh
root     13675  0.0  0.0 112648   964 pts/1    S+   10:02   0:00 grep --color=auto demo1
[root@izwz9hdz8b83dgcyit9wclz test]# kill -9 13613

此时立刻查看脚本状态

[root@izwz9hdz8b83dgcyit9wclz ~]# supervisorctl status
demo1                            STARTING  
[root@izwz9hdz8b83dgcyit9wclz ~]# supervisorctl status
demo1                            RUNNING   pid 13690, uptime 0:00:06
[root@izwz9hdz8b83dgcyit9wclz ~]# 

可以看到脚本已经再次启动中STARTING ，然后变成RUNNING
说明supervisor 可以实现对异常中断的子进程的自动重启
其他：
手动来停止一下这个服务

supervisorctl stop demo1

[root@izwz9hdz8b83dgcyit9wclz ~]# supervisorctl stop demo1
demo1: stopped
[root@izwz9hdz8b83dgcyit9wclz ~]# supervisorctl status
demo1                            STOPPED   May 10 10:08 AM
[root@izwz9hdz8b83dgcyit9wclz ~]# 

再次启动这个服务（此处同上面提到的 如果supervisord已经启动 此时只需使用supervisorctl 启动指定的服务）

supervisorctl start demo1