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使用Supervisor守护Python进程

2014-05-15 16:27 435 查看

1、需求

现在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,就需要使用到了Supervisor。Supervisor起到守护进程的作用。

2、安装

https://pypi.python.org/pypi/supervisor

tar zxvf supervisor-3.0.tar.gz
cd supervisor-3.0
python2.7 setup.py build
python2.7 setup.py install


  

需要依赖于meld3-1.0.0.tar.gz,联网安装,由于所在机器无法上网,故进行手动安装meld。

参照上面方法再进行安装meld,安装完成之后再次进行install即可。

测试安装是否成功:echo_supervisord_conf

配置文件:echo_supervisord_conf > /etc/supervisord.conf

3、Supervisor相关

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

4、Demo1测试

需求是对本地的API进程进行守护,要求这个服务能在意外停止后自动重启。

API的执行命令为:python2.6 /data1/guosong/mysqlapi/main/api_main.py --port=8005

修改配置文件

[program:mysqlapi]
command = python2.6 /data1/guosong/mysqlapi/main/api_main.py --port=8005
autostart = true
autorestart = true
startsecs = 3
stdout_logfile = /data1/guosong/mysqlapi/log/mysqlapi_demo1.log


启动supervisord

[root@typhoeus79 mysqlapi]# ps aux |grep super
root     15377  0.0  0.0  61268   788 pts/3    R+   16:23   0:00 grep super
[root@typhoeus79 mysqlapi]# supervisord
Unlinking stale socket /var/tmp/supervisor.sock
[root@typhoeus79 mysqlapi]# ps aux |grep super
root     15458  0.0  0.0 147148  7976 ?        Ss   16:23   0:00 /usr/bin/python /usr/bin/supervisord
root     15533  0.0  0.0  61268   792 pts/3    S+   16:23   0:00 grep super 


查看进程状态

[root@typhoeus79 mysqlapi]# supervisorctl
mysqlapi       RUNNING    pid 15460, uptime 0:01:19
supervisor> status
mysqlapi       RUNNING    pid 15460, uptime 0:01:21
supervisor> exit
[root@typhoeus79 mysqlapi]# ps aux |grep 8005
root     15460  0.2  0.0 208436 15484 ?        S    16:23   0:00 python2.6 /data1/guosong/mysqlapi/main/api_main.py --port=8005
root     16314  0.0  0.0  61268   788 pts/3    S+   16:24   0:00 grep 8005
[root@typhoeus79 mysqlapi]#   


kill测试

[root@typhoeus79 mysqlapi]# ps aux |grep 8005
root     15460  0.2  0.0 208436 15484 ?        S    16:23   0:00 python2.6 /data1/guosong/mysqlapi/main/api_main.py --port=8005
root     16314  0.0  0.0  61268   788 pts/3    S+   16:24   0:00 grep 8005
[root@typhoeus79 mysqlapi]#
[root@typhoeus79 mysqlapi]# kill 15460
[root@typhoeus79 mysqlapi]# ps aux |grep 8005
root     17431 21.0  0.0 208436 15484 ?        S    16:25   0:00 python2.6 /data1/guosong/mysqlapi/main/api_main.py --port=8005
root     17437  0.0  0.0  61268   772 pts/3    R+   16:25   0:00 grep 8005
[root@typhoeus79 mysqlapi]# kill -9 17431
[root@typhoeus79 mysqlapi]# ps aux |grep 8005 |grep -v grep
root     17540  7.0  0.0 208440 15488 ?        S    16:25   0:00 python2.6 /data1/guosong/mysqlapi/main/api_main.py --port=8005
[root@typhoeus79 mysqlapi]#


使用kill以及kill -9 进程的id都发生变化

使用supervisorctl进行程序重启

[root@typhoeus79 mysqlapi]# supervisorctl stop all
mysqlapi: stopped
[root@typhoeus79 mysqlapi]# ps aux |grep 8005 |grep -v grep
[root@typhoeus79 mysqlapi]# supervisorctl start all
mysqlapi: started
[root@typhoeus79 mysqlapi]# ps aux |grep 8005 |grep -v grep
root     19649  3.0  0.0 208440 15488 ?        S    16:28   0:00 python2.6 /data1/guosong/mysqlapi/main/api_main.py --port=8005
[root@typhoeus79 mysqlapi]#


5、Demo2测试

守护多个进程,修改/etc/supervisord.conf配置

[program:mysqlapi]
command=python26  /data1/guosong/mysqlapi/main/api_main.py --port=140%(process_num)02d
process_name=%(program_name)s_%(process_num)02d ; process_name expr (default %(program_name)s)
numprocs=8
numprocs_start=81
startretries=3
stopwaitsecs=10
autorstart=true
log_stdout=true
log_stderr=true
logfile=/data1/guosong/mysqlapi/log/mysql_api_demo.log


超过2位数如何表示?

command=python26  /data1/guosong/mysqlapi/main/api_main.py --port=140%(process_num)02d


结果演示:



  

6、问题集锦

问题1-mysqlapi entered FATAL state, too many start retries too quickly:

2014-05-15 17:26:30,898 INFO exited: mysqlapi (exit status 1; not expected)
2014-05-15 17:26:30,899 INFO received SIGCLD indicating a child quit
2014-05-15 17:26:31,901 INFO gave up: mysqlapi entered FATAL state, too many start retries too quickly


原因在于版本导致,api的脚本版本为python26,故使用supervisord也需要使用python26进行安装,查看进程信息如下:

root     24058  0.0  0.0 151420 10204 ?        Ss   18:28   0:00 /usr/bin/python26 /usr/bin/supervisord -c /etc/supervisord.conf


问题2- http://127.0.0.1:9001 refused connection:

[root@typhoeus79 20140515]# supervisorctl http://10.75.xxx.xxx:9001 refused connection


原因在于没有开启inet_http_server,配置文件默认使用分号注释每行



将inet_http_server前面的分号去除后,重新开启supervisord

[root@typhoeus79 20140515]# /etc/init.d/supervisord stop
Stopping supervisord:                                      [  OK  ]
[root@typhoeus79 20140515]# supervisord -c /etc/supervisord.conf
[root@typhoeus79 20140515]# supervisorctl
mysqlapi:mysqlapi_81             RUNNING    pid 32513, uptime 0:00:02
mysqlapi:mysqlapi_82             RUNNING    pid 32511, uptime 0:00:02
mysqlapi:mysqlapi_83             RUNNING    pid 32512, uptime 0:00:02
mysqlapi:mysqlapi_84             RUNNING    pid 32509, uptime 0:00:02
mysqlapi:mysqlapi_85             RUNNING    pid 32510, uptime 0:00:02
mysqlapi:mysqlapi_86             RUNNING    pid 32507, uptime 0:00:02
mysqlapi:mysqlapi_87             RUNNING    pid 32508, uptime 0:00:02
mysqlapi:mysqlapi_88             RUNNING    pid 32514, uptime 0:00:02


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