Question

我有一个小的python代码重新启动它不存在的nginx。当我跑sudo python monitor_server.py时一切都很好。当我尝试使用root cron（sudo crontab -e）时使用以下行来表示它：
* * * * * python /root/monitor_server.py > /var/log/my_monitor/cron_log.log 2>&1 我明白了：

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')

Answer 1

尝试使用绝对路径调用命令，因为在没有shell的情况下调用它，在另一个用户帐户下，如果没有指定绝对路径，则某些命令不可用。

首先找到，命令位于何处：

$ which service
/usr/sbin/service

然后将您的代码更改为：

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

crontab python子进程和服务重启

1 个答案: