crontab python子进程和服务重启 [英] crontab python subprocess and service restart

问题描述

我有一个小的python代码重新启动nginx它不存在。
当我运行 sudo python monitor_server.py 一切正常。
当我尝试使用根cron（ sudo crontab -e ）用以下行代替它：

* * * * * python /root/monitor_server.py> /var/log/my_monitor/cron_log.log 2>& 1
我获得：

I have a small python code that restarts nginx on it's not existing. When I run sudo python monitor_server.py all is fine. When I tried to cron it with root cron (sudo crontab -e) with the line:
* * * * * python /root/monitor_server.py > /var/log/my_monitor/cron_log.log 2>&1 I get:

Traceback (most recent call last):
  File "/root/monitor_server.py", line 19, in <module>
    restart_service('mongod')
  File "/root/monitor_server.py", line 10, in restart_service
    subprocess.call(command, shell=False)
  File "/usr/lib64/python2.6/subprocess.py", line 478, in call
    p = Popen(*popenargs, **kwargs)
  File "/usr/lib64/python2.6/subprocess.py", line 642, in __init__
    errread, errwrite)
  File "/usr/lib64/python2.6/subprocess.py", line 1234, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

代码：

def restart_service(name):
    command = ['service', name, 'restart'];
    #shell=FALSE for sudo to work.
    subprocess.call(command, shell=False)

if __name__ == '__main__':
    try:
        f = urllib2.urlopen("<healthcheck URL>")
    except (urllib2.HTTPError, urllib2.URLError) as e:
        logging.log(logging.ERROR, 'restarting server')
        restart_service('nginx')

推荐答案

尝试使用绝对路径调用命令，

Try calling the command using absolute path, as you call it without shell and under another user account, some commands are not available without specifying absolute path.

首先找到命令所在的位置：

First find, where is the command located:

$ which service
/usr/sbin/service

b $ b

然后将代码更改为：

Then change your code to:

def restart_service(name):
    command = ['/usr/sbin/service', name, 'restart'];
    #shell=FALSE for sudo to work.
    subprocess.call(command, shell=False)

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