Python定时执行脚本

最近测试hbase，老发现服务挂掉，自己不能及时发现，想了想，写了个脚本，让脚本每个小时执行一次，以便检测是否有服务挂掉，如果有服务挂掉，及时启动

import os

import datetime

class CheckService(object):

    def __init__(self):

        pass

　　

    def getService(self):

        # service list

        service = ['Jps'

                ,'EmbeddedServer'

                ,'QuorumPeerMain'

                ,'NodeManager'

                ,'ResourceManager'

                ,'NameNode'

                ,'SecondaryNameNode'

                ,'HMaster'

                ,'HRegionServer'

                ,'RunJar'

                ]

        # Traversal list

        for i in service:

            a = "jps | awk '{print $2}'|grep "+i

            res = os.system(a)

            # Determine whether the service is running

            if res != 0 :

                print "%s is not running!" %(i)

                if i == 'HMaster':

                    os.system('start-hbase.sh')

                elif i == 'HRegionServer':

                    os.system('local-regionservers.sh start 1')

                elif i == 'EmbeddedServer':

                    os.system('ranger-admin start')

                elif i == 'QuorumPeerMain':

                    os.system('zkServer.sh start')

                    else:

                    print 'restart Hadoop !!!'

    def timerFun(self,sched_Timer):

        flag = 0

        while True:

            now = datetime.datetime.now()

            if now == sched_Timer:

                self.getService()

                flag = 1
　　　　　　　　　

            else:

                if flag == 1:

                    sched_Timer = sched_Timer + datetime.timedelta(hours=1)

                    flag = 0

if __name__ == "__main__":

    cs = CheckService()

    sched_Timer = datetime.datetime(2017,7,25,9,14)

    print 'run the timer task at {0}'.format(sched_Timer)

    cs.timerFun(sched_Timer)

这个代码也可以扩展，把hours=1改成minutes=1就变成了每个小时定时任务，改成days=1就变成每天的定时任务