CODEWITHSUNDEEP
pythonlinuxcron
Boaz
Boaz

Reputation: 5084

crontab python subprocess and service restart

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

The code:

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')

Upvotes: 4

Views: 4405

Answers (1)

Jan Vlcinsky
Jan Vlcinsky

Reputation: 44152

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.

First find, where is the command located:

$ which service
/usr/sbin/service

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)

Upvotes: 4

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