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