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  • Supervisor 管理后台守护进程

    Supervisor 管理后台守护进程

    参考原文如下:

    http://codinn.com/people/brant/notes/110948/

    做了一些注释

    +++++++++++引用开始++++++++++++


    自己开发的应用往往也希望做到随系统自动启动, 而且启动之后最好还能方便的控制其停止/重启. 传统的做法是在 /etc/init.d/ 下建立启动脚本, 但这个方法非常繁琐, 容易出错, 而且不同服务器/不同版本的配置又有差异.

    通常需要借助一些辅助工具. 常用的管理工具有 runitdaemontools 以及用 Python 开发的 Supervisor. 其中以 Supervisor 最为易用, 功能也很完善.

    安装

    • 安装命令
        sudo apt-get install supervisor
    
    • 安装完成, Supervisor 自动会随系统自动启动

    命令

    Supervisor 有两个可执行程序 – supervisord 和 supervisorctl:

    • supervisord 是后台管理服务器, 用来依据配置文件的策略管理后台守护进程, 它会随系统自动启动
    • supervisorctl 用于管理员向后台管理程序发送 启动/重启/停止 等指令;

    它们之间的关系就相当于 Apache 的 httpd 和 apachectl.

    主配置文件

    配置文件 用来指示 Supervisor 有哪些进程需要管理, 以及管理策略.

    主配置文件 的路径位于 /etc/supervisor/supervisord.conf, 主配置文件中的末尾两行文本:

    [include]
    files = /etc/supervisor/conf.d/*.conf
    

    指明了 Supervisor 会去 /etc/supervisor/conf.d/ 目录下查找以 .conf 结尾的子配置文件, 也就是说, 我们只需在 /etc/supervisor/conf.d/ 目录下为每个后台守护应用新建一个配置文件即可.

    子配置文件

    举个例子, 我们只需新建一个子配置文件 /etc/supervisor/conf.d/iot-kb.conf:

    [program:codinn]
    command = /srv/codinn/ENV/bin/python /srv/codinn/manage.py runwsgiserver
    
    • 为了方便管理, 每个后台守护应用对应一个 /etc/supervisor/conf.d/[program-name].conf 子配置文件
    • program: 后跟随的 codinn 指明后台守护应用的代号, supervisorctl 需要用该代号控制守护进程的启动/停止.
    • program 区的更多配置请参考: [program:x] Section Settings
    • 子配置基本上只需关心 program 区
    • command 字段设置的是后台守护应用的启动命令, 注意: 该命令必须是在前台执行的, 即会独占控制台, 否则会导致 supervisor 无法获得标准输出, 并失去进程的控制权.

    控制守护进程

    • 每次 修改主配置文件 或 增改子配置文件 都需要执行 supervisorctl update 使新配置生效:
        sudo supervisorctl update
    
    • 控制守护进程:
        # 控制所有进程
        sudo supervisorctl start all
        sudo supervisorctl stop all
        sudo supervisorctl restart all
    
        # 定向控制指定进程
        sudo supervisorctl stop iot-kb
        sudo supervisorctl start iot-kb
        sudo supervisorctl restart iot-kb
    

    supervisorctl 子命令

    $ supervisorctl help
    
    default commands (type help <topic>):
    =====================================
    add    clear  fg        open  quit    remove  restart   start   stop  update
    avail  exit   maintail  pid   reload  reread  shutdown  status  tail  version
    

    +++++++++++引用结束++++++++++++

    这里我分享一个我自己设置的配置文件。

    一般是这样用的

    supervisord -c [/path/to/supervisord.conf]
    supervisorctl -c [/path/to/supervisord.conf] start all

    请看,在echo_supervisord_conf > /etc/supervisord.conf 后,一个简单的/etc/supervisord.conf

    ; Sample supervisor config file.
    ;
    ; For more information on the config file, please see:
    ; http://supervisord.org/configuration.html
    ;
    ; Note: shell expansion ("~" or "$HOME") is not supported.  Environment
    ; variables can be expanded using this syntax: "%(ENV_HOME)s".
    
    [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=/var/log/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:///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 = relative/directory/*.ini
    
    ;This is for Chinese Segmentation APIs built within Torando web framework
    [program:segm_cn_8100]
    command=python /root/software/segm_cn/center.py --port=8100
    directory=/root/software/segm_cn
    autorestart=true
    redirect_stderr=true
    stdout_logfile=/var/log/stdout_segm_cn_8100.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=/var/log/stderr_segm_cn_8100.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)
    
    [program:segm_cn_8101]
    command=python /root/software/segm_cn/center.py --port=8101
    directory=/root/software/segm_cn
    autorestart=true
    redirect_stderr=true
    stdout_logfile=/var/log/stdout_segm_cn_8101.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=/var/log/stderr_segm_cn_8101.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)

    上面采用两个program 虽然是同样的功能,但是能非常好的用nginx 分发端口服务。这样能极大的利用效率。有利于高并发的访问。

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  • 原文地址:https://www.cnblogs.com/spaceship9/p/3577754.html
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