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Supervisor安装与配置教程

介绍

Supervisor是一个进程管理工具

用途就是有一个进程需要每时每刻不断的跑,但是这个进程又有可能由于各种原因有可能中断。当进程中断的时候我希望能自动重新启动它,此时,我就需要使用到了Supervisor

这个工具主要就两个命令:

supervisord : supervisor的服务器端部分,启动supervisor就是运行这个命令

supervisorctl:启动supervisor的命令行窗口。

安装

CentOS7

yum install python-setuptools
easy_install supervisor


CentOS6

yum -y install python-setuptools

由于用pip install supervisor,默认装的是最新的4.0.3版本,但是centos6默认的只有python2.6,4.0.3的supervisor跑不起来,升级到python2.7又比较麻烦,可以使用下面的方面安装指定版本

pip install supervisor==3.1.3
或者
easy_install supervisor==3.1.3


easy_install是setuptools包里带的一个命令,使用easy_install实际上是在调用setuptools来完成安装模块的工作,所以安装setuptools即可。
在setup.py中规定meld3的版本要求:

如果执行完easy_install supervisor出现下面的meld3版本问题
Installing supervisord script to /usr/bin

Installed /usr/lib/python2.6/site-packages/supervisor-3.1.3-py2.6.egg
Processing dependencies for supervisor==3.1.3
Searching for meld3>=0.6.5
Reading http://pypi.python.org/simple/meld3/
Couldn't find index page for 'meld3' (maybe misspelled?)
Scanning index of all packages (this may take a while)
Reading http://pypi.python.org/simple/
No local packages or download links found for meld3>=0.6.5
error: Could not find suitable distribution for Requirement.parse('meld3>=0.6.5')
请参考下面解决方法:

第一种方法:
可以修改requires.txt文件,注释掉这个meld3的版本要求,修改如下:
[online@kermit supervisor-3.3.0]$ locate requires.txt
/opt/modules/download/supervisor-3.3.0/supervisor.egg-info/requires.txt
/usr/lib/python2.6/site-packages/supervisor-3.3.0-py2.6.egg/EGG-INFO/requires.txt

#然后编辑此文件:/usr/lib/python2.6/site-packages/supervisor-3.3.0-py2.6.egg/EGG-INFO/requires.txt,将meld3 >= 0.6.5本行注释掉.
#meld3 >= 0.6.5
[iterparse]
cElementTree >= 1.0.2

第二种方法:
#下载meld
wget https://pypi.python.org/packages/45/a0/317c6422b26c12fe0161e936fc35f36552069ba8e6f7ecbd99bbffe32a5f/meld3-1.0.2.tar.gz
tar zxvf meld3-1.0.2.tar.gz
cd meld3-1.0.2
python setup.py install
测试

测试是否安装成功
echo_supervisord_conf

输出如下:

[unix_http_server]
file=/var/run/supervisor/supervisor.sock ; socket 路径

;chmod=0700 ; socket 文件的权限
;chown=nobody:nogroup ; socket 所属用户及组
;username=user ; 用户名
;password=123 ; 密码

;[inet_http_server] ; 是否启用服务,默认是关闭的(启用的话可以看到supervisor 管理的服务状态)
;port=127.0.0.1:9001 ; 监听的IP及端口
;username=user ; 用户名
;password=123 ; 密码

[supervisord] ; supervisord 全局配置
logfile=/var/log/supervisor/supervisord.log ; supervisor 日志路径
logfile_maxbytes=50MB ; 单个日志文件最大数
logfile_backups=10 ; 保留多少个日志文件(默认10个)
loglevel=info ; (log level;default info; others: debug,warn,trace)
pidfile=/var/run/supervisord.pid ; pid 文件路径
nodaemon=false ; 启动是否丢到前台,设置为false ,表示以daemon 的方式启动
minfds=1024 ; 最小文件打开数,对应系统limit.conf 中的nofile ,默认最小为1024,最大为4096
minprocs=200 ; 最小的进程打开数,对应系统的limit.conf 中的nproc,默认为200
;umask=022 ; (process file creation umask;default 022)
;user=chrism ; 启动supervisord 服务的用户,默认为root
;identifier=supervisor ; (supervisord identifier, default is 'supervisor')
;directory=/tmp ; 这里的目录指的是服务的工作目录
;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] ; 定义一个守护进程 ,比如下面的elasticsearch
;command=/bin/cat ; 启动程序使用的命令,可以是绝对路径或者相对路径
;process_name=%(program_name)s ; 一个python字符串表达式,用来表示supervisor进程启动的这个的名称,默认值是%(program_name)s
;numprocs=1 ; Supervisor启动这个程序的多个实例,如果numprocs>1,则process_name的表达式必须包含%(process_num)s,默认是1
;directory=/tmp ; supervisord在生成子进程的时候会切换到该目录
;umask=022 ; umask for process (default None)
;priority=999 ; 权重,可以控制程序启动和关闭时的顺序,权重越低:越早启动,越晚关闭。默认值是999
;autostart=true ; 如果设置为true,当supervisord启动的时候,进程会自动启动
;autorestart=true ; 设置为随 supervisord 重启而重启,值可以是false、true、unexpected。false:进程不会自动重启
;startsecs=10 ; 程序启动后等待多长时间后才认为程序启动成功,默认是10秒
;startretries=3 ; supervisord尝试启动一个程序时尝试的次数。默认是3
;exitcodes=0,2 ; 一个预期的退出返回码,默认是0,2。
;stopsignal=QUIT ; 当收到stop请求的时候,发送信号给程序,默认是TERM信号,也可以是 HUP, INT, QUIT, KILL, USR1, or USR2
;stopwaitsecs=10 ; 在操作系统给supervisord发送SIGCHILD信号时等待的时间
;user=chrism ; 如果supervisord以root运行,则会使用这个设置用户启动子程序
;redirect_stderr=true ; 如果设置为true,进程则会把标准错误输出到supervisord后台的标准输出文件描述符
;stdout_logfile=/a/path ; 把进程的标准输出写入文件中,如果stdout_logfile没有设置或者设置为AUTO,则supervisor会自动选择一个文件位置
;stdout_logfile_maxbytes=1MB ; 标准输出log文件达到多少后自动进行轮转,单位是KB、MB、GB。如果设置为0则表示不限制日志文件大小
;stdout_logfile_backups=10 ; 标准输出日志轮转备份的数量,默认是10,如果设置为0,则不备份
;stdout_capture_maxbytes=1MB ; 当进程处于stderr capture mode模式的时候,写入FIFO队列的最大bytes值,单位可以是KB、MB、GB
;stdout_events_enabled=false ; 如果设置为true,当进程在写它的stderr
;stderr_logfile=/a/path ; 把进程的错误日志输出一个文件中,除非redirect_stderr参数被设置为true
;stderr_logfile_maxbytes=1MB ; 错误log文件达到多少后自动进行轮转,单位是KB、MB、GB。如果设置为0则表示不限制日志文件大小
;stderr_logfile_backups=10 ; 错误日志轮转备份的数量,默认是10,如果设置为0,则不备份
;stderr_capture_maxbytes=1MB ; 当进程处于stderr capture mode模式的时候,写入FIFO队列的最大bytes值,单位可以是KB、MB、GB
;stderr_events_enabled=false ; 如果设置为true,当进程在写它的stderr到文件描述符的时候,PROCESS_LOG_STDERR事件会被触发
;environment=A=1,B=2 ; 一个k/v对的list列表
;serverurl=AUTO ; 是否允许子进程和内部的HTTP服务通讯,如果设置为AUTO,supervisor会自动的构造一个url

; 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.
#这个地方是自定义一个守护进程
[program:elasticsearch] ; 定义一个守护进程 elasticsearch
environment=ES_HOME=/usr/local/elasticsearch ; 设置ES_HOME 环境变量
user=elk ; 启动elasticsearch 的用户
directory=/usr/local/elasticsearch ; 进入到这个目录中
command=/usr/local/elasticsearch/bin/elasticsearch ; 执行启动命令
numprocs=1 ; Supervisor启动这个程序的多个实例,如果numprocs>1,则process_name的表达式必须包含%(process_num)s,默认是1
autostart=true ; 设置为随 supervisord 启动而启动
autorestart=true ; 设置为随 supervisord 重启而重启
startretries=3 ; 设置elasticsearch 重启的重试次数
priority=1 ; 权重,可以控制程序启动和关闭时的顺序,权重越低:越早启动,越晚关闭。默认值是999

;[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] ; 服务组管理,可以将多个服务名写到这里管理(组名自定义)
;programs=progname1,progname2 ; 上面配置好的服务名,比如elasticsearch,kibana,logstash
;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
注:分号(;)开头的配置表示注释

#创建配置文件
echo_supervisord_conf > /etc/supervisord.conf ##这个配置文件默认是不存在的,需要自己导入,运行echo_supervisord_conf打印出一个配置文件的样本

启动

确定supervisord 服务并设置为随机启动:

通过easy_install 安装的supervisor运行supervisord 运行:

supervisord
或者加载的时候需要,supervisord -c /etc/supervisord.conf这样就可以了

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