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【Python】 python守护进程监控hive server

作者:天航 / 发布于2017/3/23/ 975

1. 首先将Hive thrift server添加到系统服务后台运行添加方法地址http://jiedushi.blog.51cto.com/673653/608990 2. 利用Python daemon守护进程监控hive server进程

#!/usr/bin/env python

import sys, os, time, atexit, string
from signal import SIGTERM

class Daemon:
    def __init__(self, pidfile, stdin='/dev/null', stdout='/dev/null', stderr='/dev/null'):
        self.stdin = stdin
        self.stdout = stdout
        self.stderr = stderr
        self.pidfile = pidfile

    def _daemonize(self):
        try:
            pid = os.fork()
            if pid > 0:
                sys.exit(0)
        except OSError, e:
            sys.stderr.write('fork #1 failed: %d (%s)\n' % (e.errno, e.strerror))
            sys.exit(1)
        os.setsid()
        os.chdir("/")
        os.umask(0)

        try:
            pid = os.fork()
            if pid > 0:
                sys.exit(0)
        except OSError, e:
            sys.stderr.write('fork #2 failed: %d (%s)\n' % (e.errno, e.strerror))
            sys.exit(1)

        sys.stdout.flush()
        sys.stderr.flush()
        si = file(self.stdin, 'r')
        so = file(self.stdout, 'a+')
        se = file(self.stderr, 'a+', 0)
        os.dup2(si.fileno(), sys.stdin.fileno())
        os.dup2(so.fileno(), sys.stdout.fileno())
        os.dup2(se.fileno(), sys.stderr.fileno())

        atexit.register(self.delpid)
        pid = str(os.getpid())
        file(self.pidfile,'w+').write('%s\n' % pid)

    def delpid(self):
        os.remove(self.pidfile)

    def start(self):
        try:
            pf = file(self.pidfile,'r')
            pid = int(pf.read().strip())
            pf.close()
        except IOError:
            pid = None

        if pid:
            message = 'pidfile %s already exist. Daemon already running?\n'
            sys.stderr.write(message % self.pidfile)
            sys.exit(1)

        self._daemonize()
        self._run()

    def stop(self):
        try:
            pf = file(self.pidfile,'r')
            pid = int(pf.read().strip())
            pf.close()
        except IOError:
            pid = None

        if not pid:
            message = 'pidfile %s does not exist. Daemon not running?\n'
            sys.stderr.write(message % self.pidfile)
            return

        try:
            while 1:
                os.kill(pid, SIGTERM)
                time.sleep(0.1)
                os.system("kill -9 `jps|grep RunJar|awk '{print $1}'`")
        except OSError, err:
            err = str(err)
            if err.find('No such process') > 0:
                if os.path.exists(self.pidfile):
                    os.remove(self.pidfile)
            else:
                print str(err)
                sys.exit(1)

    def restart(self):
        self.stop()
        self.start()
class MyDaemon(Daemon):
    def _run(self):
        while True:
            proccess = os.popen("jps|grep RunJar|awk '{print $1}'|wc -l").read().strip()
            port = os.popen("netstat -tnl|grep 10000|awk '{print $4}'|grep 10000|wc -l").read().strip()
            if proccess == '0':
                os.system('service hive-thrift start')
            time.sleep(2)
if __name__ == '__main__':
                daemon = MyDaemon('/tmp/watch_process.pid')
                if len(sys.argv) == 2:
                                if 'start' == sys.argv[1]:
                                                daemon.start()
                                elif 'stop' == sys.argv[1]:
                                                daemon.stop()
                                elif 'restart' == sys.argv[1]:
                                                daemon.restart()
                                else:
                                                print 'Unknown command'
                                                sys.exit(2)
                                sys.exit(0)
                else:
                                print 'usage: %s start|stop|restart' % sys.argv[0]
                                sys.exit(2)

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