supervisor安装和使用

首先，我们要理解一下supervisor是做什么的，能做什么，在什么情况下，会用到supervisor。supervisor是一个进程管理工具，可以根据supervisor管理服务的进程，如果服务的进程挂了，supervisor可以自动启动服务的进程或者进程报警，减少人工干预的成本，不过这里的进程如果是假死就不适用了，不过进程的假死可以使用另外一种形式完成，直接请求服务的一个url，就可以判断服务是否一直在工作。下面看一下supervisor的安装和使用方法：

安装方法

配置好yum源后，可以直接安装

[root@www.wulaoer.org ~]# yum install epel-release
[root@www.wulaoer.org ~]# yum install -y supervisor
[root@www.wulaoer.org ~]# systemctl enable supervisord # 开机自启动
[root@www.wulaoer.org ~]# systemctl start supervisord # 启动supervisord服务
[root@www.wulaoer.org ~]# systemctl status supervisord # 查看supervisord服务状态
[root@www.wulaoer.org ~]# ps -ef|grep supervisord # 查看是否存在supervisord进程

Debian/Ubuntu可通过apt安装

[root@www.wulaoer.org ~]#  apt-get install supervisor

pip安装

[root@www.wulaoer.org ~]# pip install supervisor

easy_install安装

[root@www.wulaoer.org ~]# easy_install supervisor

使用方法

这里使用redis作为例子，利用supervisor启动redis进程，一旦redis出现挂了，会自动重新拉起一个新的进程，保证redis的正常运行。首先，需要配置一下supervisor，为了区分不同的进程，所以我们根据进程创建不同的配置文件，然后把配置文件进行归类。

[root@www.wulaoer.org ~]# cat /etc/supervisord.conf 
; 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/*.ini       #这里配置文件的路径以及格式，如果想使用其他格式可以修改例如：*.txt

这里我就不修改了，直接使用默认的，下面是我的redis的启动配置文件

[root@www.wulaoer.org ~]# cat /etc/supervisord.d/redis.ini
[program:redis-6379]
command=/data/redis/src/redis-server  /data/redis/redis.conf
priority=999                ; 优先级（越小越优先）
autostart=true              ; supervisord启动时，该程序也启动
autorestart=true            ; 异常退出时，自动启动
startsecs=10                ; 启动后持续10s后未发生异常，才表示启动成功
startretries=3              ; 异常后，自动重启次数
exitcodes=0,2               ; exit异常抛出的是0、2时才认为是异常
stopsignal=QUIT             ; 杀进程的信号
; 在程序发送stopignal后，等待操作系统将SIGCHLD返回给supervisord的秒数。
; 如果在supervisord从进程接收到SIGCHLD之前经过了这个秒数，
; supervisord将尝试用最终的SIGKILL杀死它
stopwaitsecs=1
user=root                   ; 设置启动该程序的用户
log_stdout=true             ; 如果为True，则记录程序日志
log_stderr=false            ; 如果为True，则记录程序错误日志
logfile=/data/redis/logs/redis.log    ; 程序日志路径
logfile_maxbytes=1MB        ; 日志文件最大大小
logfile_backups=10          ; 日志文件最大数量

创建好配置文件需要更新一下supervisor，否则supervisor不能自动监测到创建的配置文件。

[root@www.wulaoer.org ~]# supervisorctl update

更新一下配置文件，然后通过supervisorctl进入supervisor终端输入，启动redis才会生效，直接使用命令启动的redis无效。start redis-6379

[root@www.wulaoer.org ~]#  supervisorctl
redis-6379                       RUNNING   pid 31033, uptime 10:20:22
supervisor> status
redis-6379                       RUNNING   pid 31033, uptime 10:22:04
supervisor> start redis-6379    #启动redis
supervisor> stop redis-6379     #停掉redis

自此，redis使用supervisor启动完成，以后在也不用担心redis挂了。。。。。。。。。。