使用Supervisor管理Celery进程。

讲过一篇celery的，但是celery启动后并不是daemon的，在生产环境中这肯定是不可以的，那怎么办呢？ 这就需要使用supervisor进行进程管理了，下面详细介绍。

一、 supervisor是干什么的。

supervisor是有Python语言编写的，基于linux操作系统的一款服务器管理工具，用以监控服务器进程的运行。
supervisor要求管理的程序是非daemon程序，supervisord会帮你把他转换成daemon程序。
因此如果使用supervisor来管理nginx进程的话，必须在nginx的配置文件里添加一行设置deamon off让nginx以非daemon方式启动,
我们这里是用supervisor是用它来管理celery进程。

二、supervisor安装

1. 安装好python环境,这个Linux系统都默认已经安装好了，但是建议安装2.7.0以上版本。
2. 使用pip或者easy_install安装
   sudo pip install supervisor 或者
   sudo easy_install supervisor
   安装完以后，进入python交互式环境，输入：
   import supervisor
   如果没有错误提示则表示安装成功。

三、 supervisor配置

1. superisor配置生成
   $ echo_supervidord_conf > /etc/supervisord.conf

2. 配置文件说明
   $ sudo cp /etc/supervisord.conf /etc/suprtvidord.conf.bak # 首先备份一下配置文件
   废话不多说，直接贴配置文件(配置文件中以；开头的行表示注释)：

   ; 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] 这个模块主要是配置sock文件的路径及权限
   [unix_http_server]
   file=/var/run/supervisor.sock    ; (the path to the socket file)
   chmod=0700                       ; socket file mode (default 0700)
   chown=root:root                  ; socket file uid:gid owner
   ;username=admin                  ; (default is no username (open server))
   ;password=admin                  ; (default is no password (open server))
   # [inet_http_server] 这个模块只要是配置Web管理界面 
   [inet_http_server]               ; inet (TCP) server disabled by default
   port=127.0.0.1:9001              ; (ip_address:port specifier, *:port for all iface)
   username=admin                   ; (default is no username (open server))
   password=admin                   ; (default is no password (open server))
   # [supervisord] 这个模块是supervisord服务的配置模块，比如日志文件位置，日志等级等等 
   [supervisord]
   logfile=/home/liuyadong/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] 这个模块的值必须和"unix_http_server"里面设定的匹配
   [supervisorctl]
   serverurl=unix:///var/run/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=admin                                          ; should be same as http_username if set
   ;password=admin                                          ; 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:xxx] 这个模块就是需要管理的进程模块, 字段属性也很简单，后面有注释就不详细介绍了。
   # 这个模块可以是多个
   [program:celery]
   command=celery worker -A monitorAuto.celery --loglevel=info          ; 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=/home/liuyadong/git/monitor_auto/                          ; directory to cwd to before exec (def no cwd)
   autostart=true                                                       ; start at supervisord start (default: true)
   startsecs=10                                                         ; # of secs prog must stay up to be running (def. 1)
   startretries=3                                                       ; max # of serial start failures when starting (default 3)
   ;autorestart=ture                                                    ; when to restart if exited after running (def: unexpected)
   ;exitcodes=0,2                                                       ; 'expected' exit codes used with autorestart (default 0,2)
   ;stopsignal=QUIT                                                     ; signal used to kill process (default TERM)
   stopwaitsecs=600                                                     ; max num secs to wait b4 SIGKILL (default 10)
   ;stopasgroup=false                                                   ; send stop signal to the UNIX process group (default false)
   killasgroup=true                                                     ; SIGKILL the UNIX process group (def false)
   user=liuyadong                                                       ; setuid to this UNIX account to run the program
   redirect_stderr=true                                                 ; redirect proc stderr to stdout (default false)
   stdout_logfile=/home/liuyadong/log/supervisor/supercelery.log        ; 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=/home/liuyadong/log/supervisor/supercelery.error.log  ; 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.
   ;[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 = relative/directory/*.ini

四、 Supervisord管理 Supervidord安装完成以后有两个可用的命令行supervisor和supervisorctl

 ? supervisord，                     初始启动Supervisord，启动、管理配置中设置的进程。
 ? supervisorctl stop programxxx     停止某一个进程(programxxx)，programxxx为[program:chatdemon]里配置的值，这个示例就是chatdemon。
 ? supervisorctl start programxxx    启动某个进程
 ? supervisorctl restart programxxx  重启某个进程
 ? supervisorctl stop groupworker    重启所有属于名为groupworker这个分组的进程(start,restart同理)
 ? supervisorctl stop all            停止全部进程，注：start、restart、stop都不会载入最新的配置文件。
 ? supervisorctl reload              载入最新的配置文件，停止原有进程并按新的配置启动、管理所有进程。
 ? supervisorctl update              根据最新的配置文件，启动新配置或有改动的进程，配置没有改动的进程不会受影响而重启。

 注意：显示用stop停止掉的进程，用reload或者update都不会自动重启。

 可以使用--help查看命令更多的用法，我启动时遇到配置文件没有放到默认路径使用-c 参数执行