supervisor详解

Supervisor是一个进程管理系统，允许其用户监视和控制类UNIX操作系统上的大量进程。

其通过fork/exec的方式将这些被管理的进程当作supervisor的子进程来启动，
我们只需要将被管理进程配置文件置于配置子模块中。此时被管理进程被视为supervisor的子进程，若该子进程异常终端，则父进程可以准确的获取子进程异常终端的信息。

supervisor配置文件：

; 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              ; (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:///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/*.conf

此文件配置分为一下几个部分：

• [unix_http_server]: 这部分为以socket方式启动的supervisor的启动配置项
  • file: socket套接字的文件目录，默认为 /var/run/supervisor.sock
  • chmod：改变supervisor.sock的权限
  • username: 配置登录系统的的账号
  • password：登录密码
• [inet_http_server]: 这部分为以bind端口的方式启动的supervisor的启动配置项
  • port: 以端口的方式启动，默认为 127.0.0.1:9001 （此配置一般不启用，socket方式更安全）
  • username: 配置登录系统的的账号
  • password：登录密码
• [supervisord]: 这部分为supervisor的core部分,所有的特性都在此配置选项
  • logfile：日志文件的输出路径
  • logfile_maxbytes：输出日志的单个文件最大文件上限 默认为50M
  • logfile_backups：备份日志文件的个数 默认为10
  • loglevel：日志等级
  • pidfile：pid输出文件路径 默认为 /var/run/supervisord.pid 注意：不要改成temp目录下，会被操作系统误删除pid文件
  • nodaemon：前台运行，默认后台
  • minfds：文件描述符
  • minprocs：进程描述符
  • umask: 创建文件权限
  • user: 启动用户
  • identifier: 验证
  • directory: 启动目录
  • nocleanup: 不删除临时文件
  • childlogdir: 子日志输出目录
  • environment: 环境变量 以K、V的方式
  • strip_ansi: 在日志中剥离ANSI转义代码
• [supervisorctl] : 这部分为supervisor的客户端配置,包含web，以及cli方式
  • serverurl：客户端有两种连接方式，socket套接字和http端口连接（界面）
  • username：界面账号
  • password：界面密码
  • prompt：命令行
  • history_file：使用readline的历史提示
• [include]: 包含了所需被管理进程的配置选项
  • files：统一的子进程模块目录 默认 /etc/supervisor/conf.d/ 下
• [program:x]：配置文件必须包括至少一个进程，x是进程名称
  • command：包含一个命令，当这个program启动时执行
  • directroy：执行子进程时supervisord暂时切换到该目录 （说实话，运行的时候没有切换。。。可能我没理解对）
  • user：程序运行用户名
  • autostart: 跟随supervisor启动
  • autorestart：自动重启
  • startretries： 尝试启动
  • environment： 可以针对单个程序设置环境变量，比如: JAVA
  • startsecs：进程从STARING状态转换到RUNNING状态program所需要保持运行的时间（不是delay时间，反正我试过，就是个显示状态）
  • 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
    

    Tomcat 实例

    [program:tomcat]
    environment=JAVA_HOME="/usr/local/java"
    command=/usr/local/tomcat/bin/catalina.sh run
    user=root
    autostart = true
    startsecs = 5
    autorestart = true
    startretries = 3