Supervisor使用教程

在项目中,经常有脚本需要常驻运行的需求。以PHP脚本为例,最简单的方式是:

$ nohup php cli.php &

这样能保证当前终端被关闭或者按CRTL+C后,脚本仍在后台运行。但是没法保证脚本异常后自动重启等。

Supervisor 是用Python开发的一套通用的进程管理程序,能将一个普通的命令行进程变为后台daemon,并监控进程状态,异常退出时能自动重启。

官网介绍:http://supervisord.org/

本文所用环境:

  • CentOS release 6.8 (Final)
  • Python 2.6.6
  • pip 7.1.0 from /usr/lib/python2.6/site-packages (python 2.6)
  • supervisor 3.3.4

安装

平台要求

引自官网(http://supervisord.org/introduction.html#platform-requirements):

Supervisor已经过测试,可以在Linux(Ubuntu 9.10),Mac OS X(10.4 / 10.5 / 10.6)和Solaris(10 for Intel)和FreeBSD 6.1上运行。它可能在大多数UNIX系统上都能正常工作。在任何版本的Windows下,Supervisor 都不会运行。Supervisor 可以使用Python 2.4或更高版本,但不能在任何版本的Python 3下使用。

我使用的环境:

$ python -V
Python 2.6.6

安装

安装方法有:
1、easy_install 安装(需安装有pip):

$ easy_install supervisor

2、pip 安装(需安装有pip,推荐):

$ pip install supervisor

3、Debian / Ubuntu可以直接通过apt安装:

$ apt-get install supervisor

本文测试的时候是使用pip安装的。其它方式未做测试。

安装后配置文件生成:

1、通过easy_install或pip安装后,需要运行

$ mkdir /etc/supervisor
$ echo_supervisord_conf > /etc/supervisor/supervisord.conf

生成配置文件。

2、使用apt-get安装后,supervisor的主配置文件在:

/etc/supervisor/supervisord.conf 

supervisor的配置文件默认是不全的。子进程配置文件在:

/etc/supervisor/conf.d/*.conf

启动supervisor

我们先修改supervisord.conf最后的[include]部分配置:

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

这样就可以支持子配置文件,而不用改动主配置文件。

启动方法一般有:

1、使用 pip或者easy_install 安装的supervisor则:

$ supervisord 

即可运行。

supervisor 默认在以下路径查找配置文件:/usr/etc/supervisord.conf, /usr/supervisord.conf, supervisord.conf, etc/supervisord.conf, /etc/supervisord.conf, /etc/supervisor/supervisord.conf

如需指定主配置文件,则需要使用-c参数:

$ supervisord -c /etc/supervisor/supervisord.conf

查看安装的版本:

$ supervisord -v
3.3.4

然后查看supervisor的状态:

$ supervisorctl  status

注: supervisord是主进程,supervisorctl是给守护进程发送命令的客户端工具。

2、使用 apt-get 安装的supervisor直接可以通过

$ /etc/init.d/supervisor start

运行。

使用示例

我们以简单的 /tmp/echo_time.sh 为例:

#/bin/bash

while true; do
    echo `date +%Y-%m-%d,%H:%m:%s`
    sleep 2
done

/etc/supervisor/conf.d/新增子进程配置文件 echo_time.conf

[program:echo_time]
command=sh /tmp/echo_time.sh
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. 10)
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 before SIGKILL (default 10)
user=root                 ; setuid to this UNIX account to run the program
log_stdout=true
log_stderr=true             ; if true, log program stderr (def false)
logfile=/tmp/echo_time.log
logfile_maxbytes=1MB        ; max # logfile bytes b4 rotation (default 50MB)
logfile_backups=10          ; # of logfile backups (default 10)
stdout_logfile_maxbytes=20MB  ; stdout 日志文件大小,默认 50MB
stdout_logfile_backups=20     ; stdout 日志文件备份数
stdout_logfile=/tmp/echo_time.stdout.log

然后启动程序:

$ supervisorctl reread
$ supervisorctl update

这两个命令分别代表重新读取配置、更新子进程组。执行update后输出:

echo_time: added process group

这样刚才添加的echo_time脚本就常驻运行起来了。可以通过日志查看运行情况:

$ tail -f /tmp/echo_time.stdout.log
2018-12-22,14:12:1545459550
2018-12-22,14:12:1545459552
2018-12-22,14:12:1545459554

也可以使用supervisorctl status查看子进程运行情况:

$ supervisorctl  status
echo_time                        RUNNING   pid 28206, uptime 0:00:11

配置文件

主配置

主配置文件名: supervisord.conf

可以通过运行echo_supervisord_conf获得。这个配置文件一般情况下不需要更改,除了最后的[include]部分,其余保持默认即可。

[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]         ; 配置web后台
;port=127.0.0.1:9001        ; 指定ip_address:port, 使用 *:port 监听所有 IP
;username=user              ; 默认没有用户名 (open server)
;password=123               ; 默认没有密码 (open server)

[supervisord]
logfile=/tmp/supervisord.log ; 日志文件; 默认 $CWD/supervisord.log
logfile_maxbytes=50MB        ; 日志文件最大大小; 默认 50MB
logfile_backups=10           ; # of main logfile backups; 0 means none, default 10
loglevel=info                ; log level; default info; others: debug,warn,trace
pidfile=/tmp/supervisord.pid ; pid文件
nodaemon=false               ; 是否运行在前台; 默认是后台
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 rpcinterface:supervisor 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:x] sections.

[rpcinterface:supervisor]
supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface

; 配置 supervisorctl 
; configure it match the settings in either the unix_http_server
; or inet_http_server section.

[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 in [*_http_server] if set
;password=123                ; should be same as in [*_http_server] if set
;prompt=mysupervisor         ; cmd line prompt (default "supervisor")
;history_file=~/.sc_history  ; use readline history if available

; 下面是子进程配置文件示例
; 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)
;startsecs=1                   ; # of secs prog must stay up to be running (def. 1)
;startretries=3                ; max # of serial start failures when starting (default 3)
;autorestart=unexpected        ; 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=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 (0 means none, 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 (0 means none, 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 sample eventlistener section below shows all possible eventlistener
; subsection values.  Create one or more 'real' eventlistener: sections to be
; able to handle event notifications sent by supervisord.

;[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)
;startsecs=1                   ; # of secs prog must stay up to be running (def. 1)
;startretries=3                ; max # of serial start failures when starting (default 3)
;autorestart=unexpected        ; autorestart 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=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=false         ; redirect_stderr=true is not allowed for eventlisteners
;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 (0 means none, 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=10     ; # of stderr logfile backups (0 means none, 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 sample group section below 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)

; 配置include files
; 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]  
; .ini和.conf都支持
files = relative/directory/*.ini

子进程配置文件

一般放在:/etc/supervisor/conf.d/目录 。一个脚本对应一个配置文件。

配置说明:

;*为必须填写项
;*[program:应用名称]
[program:cat]

;*命令路径,如果使用python启动的程序应该为 python /home/test.py, 
;不建议放入/home/user/, 对于非user用户一般情况下是不能访问
command=/bin/cat

;当numprocs为1时,process_name=%(program_name)s;
当numprocs>=2时,%(program_name)s_%(process_num)02d
process_name=%(program_name)s

;进程数量
numprocs=1

;执行目录,若有/home/supervisor_test/test1.py
;将directory设置成/home/supervisor_test
;则command只需设置成python test1.py
;否则command必须设置成绝对执行目录
directory=/tmp

;掩码:--- -w- -w-, 转换后rwx r-x w-x
umask=022

;优先级,值越高,最后启动,最先被关闭,默认值999
priority=999

;如果是true,当supervisor启动时,程序将会自动启动
autostart=true

;*自动重启
autorestart=true

;启动延时执行,默认1秒
startsecs=10

;启动尝试次数,默认3次
startretries=3

;当退出码是0,2时,执行重启,默认值0,2
exitcodes=0,2

;停止信号,默认TERM
;中断:INT(类似于Ctrl+C)(kill -INT pid),退出后会将写文件或日志(推荐)
;终止:TERM(kill -TERM pid)
;挂起:HUP(kill -HUP pid),注意与Ctrl+Z/kill -stop pid不同
;从容停止:QUIT(kill -QUIT pid)
;KILL, USR1, USR2其他见命令(kill -l),说明1
stopsignal=TERM

stopwaitsecs=10

;*以root用户执行
user=root

;重定向
redirect_stderr=false

stdout_logfile=/a/path
stdout_logfile_maxbytes=1MB
stdout_logfile_backups=10
stdout_capture_maxbytes=1MB
stderr_logfile=/a/path
stderr_logfile_maxbytes=1MB
stderr_logfile_backups=10
stderr_capture_maxbytes=1MB

;环境变量设置
environment=A="1",B="2"

serverurl=AUTO

简化模板

[program:echo_time]
command=sh /tmp/echo_time.sh
autostart=true
autorestart=true
startsecs=10
startretries=3 
exitcodes=0,2
stopsignal=QUIT
stopwaitsecs=10
user=root
log_stdout=true
log_stderr=true
logfile=/tmp/echo_time.log
logfile_maxbytes=1MB
logfile_backups=10 
stdout_logfile_maxbytes=20MB 
stdout_logfile_backups=20 
stdout_logfile=/tmp/echo_time.stdout.log

防盗版声明:本文系原创文章,发布于公众号飞鸿影的博客(fhyblog)及博客园,转载需作者同意。


命令行程序

supervisord

supervisord 是主进程。

通过supervisord -h可以查看帮助说明。示例:

-c/--configuration FILENAME ;指定配置文件
-n/--nodaemon ;运行在前台(调试用)
-v/--version ;打印版本信息

-u/--user USER ;以指定用户(或用户ID)运行
-m/--umask UMASK ;指定子进程的umask,默认是022
-l/--logfile FILENAME ;指定日志文件
-e/--loglevel LEVEL ;指定日志级别

supervisorctl

supervisorctl 是客户端程序,用于向supervisord发起命令。

通过supervisorctl -h可以查看帮助说明。我们主要关心的是其action命令:

$ supervisorctl  help

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

这些命令对于控制子进程非常重要。示例:

reread ;重新加载配置文件
update ;将配置文件里新增的子进程加入进程组,如果设置了autostart=true则会启动新新增的子进程
status ;查看所有进程状态
status <name> ;查看指定进程状态
start all; 启动所有子进程
start <name>; 启动指定子进程
restart all; 重启所有子进程
restart <name>; 重启指定子进程
stop all; 停止所有子进程
stop <name>; 停止指定子进程
reload ;重启supervisord
add <name>; 添加子进程到进程组
reomve <name>; 从进程组移除子进程,需要先stop。注意:移除后,需要使用reread和update才能重新运行该进程

supervisord 有进程组(process group)的概念:只有子进程在进程组,才能被运行。

supervisorctl也支持交互式命令行:

$ supervisorctl
echo_time                        RUNNING   pid 27188, uptime 0:05:09
supervisor> version
3.3.4
supervisor> 

web界面操作

需要开启supervisord.conf注释掉的这4行:

[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)

端口默认是监听127.0.0.1:9001,这里方便测试,修改为:

port=*:9001 

然后重启主进程supervisord:

$ supervisorctl reload

浏览器访问:http://myip:9001 ,输入用户名、密码后,即可看到web页面:

注意:如果修改配置文件时,[inet_http_server]这一行被注释,会导致不仅web需要认证,命令行使用supervisorctl也需要认证,这时候就需要在交互式命令行里输入用户名、密码才能进行下一步的操作。

其它问题

1、Centos6 docker环境没有pip

解决方案:需要先安装扩展源EPEL。

EPEL(http://fedoraproject.org/wiki/EPEL) 是由 Fedora 社区打造,为 RHEL 及衍生发行版如 CentOS、Scientific Linux 等提供高质量软件包的项目。

首先安装epel扩展源:

$ yum -y install epel-release

然后再安装pip

$ yum -y install python-pip

查看版本:

$ pip -V
pip 7.1.0 from /usr/lib/python2.6/site-packages (python 2.6)

参考:https://www.cnblogs.com/saolv/p/6963314.html

2、Centos6环境安装supervisor后,执行:

$ supervisor -V

出现:

Traceback (most recent call last):
  File "/usr/bin/echo_supervisord_conf", line 5, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python2.6/site-packages/setuptools-0.6c11-py2.6.egg/pkg_resources.py", line 2603, in <module>
  File "/usr/lib/python2.6/site-packages/setuptools-0.6c11-py2.6.egg/pkg_resources.py", line 666, in require
  File "/usr/lib/python2.6/site-packages/setuptools-0.6c11-py2.6.egg/pkg_resources.py", line 565, in resolve
pkg_resources.DistributionNotFound: meld3>=0.6.5

原因:pip安装的meld3不可用,手动安装。

wget https://pypi.python.org/packages/source/m/meld3/meld3-1.0.2.tar.gz
tar -zxf meld3-1.0.2.tar.gz
cd meld3-1.0.2
python setup.py install

感谢https://www.cnblogs.com/hubery/p/5653007.html 文章提供的方法!这个问题困扰了好久,github页面(https://github.com/Supervisor/meld3/issues/23)提供的解决方案都不可行,反而导致pip都不能用了

3、因参考github里meld3解决方案导致pip不可用:

Traceback (most recent call last):
  File "/usr/bin/pip", line 5, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python2.6/site-packages/pkg_resources/__init__.py", line 957, in <module>
    class Environment:
  File "/usr/lib/python2.6/site-packages/pkg_resources/__init__.py", line 961, in Environment
    self, search_path=None, platform=get_supported_platform(),
  File "/usr/lib/python2.6/site-packages/pkg_resources/__init__.py", line 188, in get_supported_platform
    plat = get_build_platform()
  File "/usr/lib/python2.6/site-packages/pkg_resources/__init__.py", line 391, in get_build_platform
    from sysconfig import get_platform
ImportError: No module named sysconfig

解决方案:删除/site-packages下面的包,重新安装python-setuptools:

rm -rf /usr/lib/python2.6/site-packages/pkg_resources*
yum reinstall python-setuptools

参考:https://stackoverflow.com/questions/50742538/importerror-no-module-named-sysconfig-cant-get-pip-working

参考

1、Supervisor: A Process Control System — Supervisor 3.3.4 documentation
http://supervisord.org/index.html
2、进程管理supervisor的简单说明 - jyzhou - 博客园
https://www.cnblogs.com/zhoujinyi/p/6073705.html
3、DevOps
https://mp.weixin.qq.com/s/mqrkAEaGFKJy-4PQadJJ9w?
4、supervisor使用 - 回首郑板桥 - 博客园
https://www.cnblogs.com/hubery/p/5653007.html

posted @ 2018-12-22 19:49 飞鸿影~ 阅读(...) 评论(...) 编辑 收藏