簡明詞典

價值觀 - 想法與做法 - by Wong Sir
Process scheduling - What process should run on next time and how long

聰明- 做正確的事情, 醒目- 做好一件事 by Tam Sir

mon process via pid file

#!/usr/bin/python3.2 import os self_pid_path = '/var/run/monPid.pid' pid_path_list = ['/var/run/mldonkey.pid', '/var/run/sshd.pid'] # olny a instance run def check_pid(pid): """ Check For the existence of a unix pid. """ try: os.kill(pid, 0) except OSError: return False else: return True pid_file=None if os.path.exists(self_pid_path): with open(self_pid_path, 'r') as oldpid_file: pid = oldpid_file.readline() if pid.isdigit() and check_pid(int(pid)): exit() else: pid_file = open(self_pid_path, 'w') else: pid_file = open(self_pid_path, 'a') pid_file.write(str(os.getpid())) pid_file.close() # olny a instance run # detect mldonkey alive by pid file for pid_path in pid_path_list: pid = 0 program = pid_path[pid_path.rfind('/')+1:-4] if os.path.exists(pid_path): with open(pid_path, 'r') as pid_file: pid = pid_file.readline()[:-1] if pid.isdigit() and check_pid(int(pid)): print (program + ': alive') continue else: pid = '' if pid.isdigit() and check_pid(int(pid)): print (program + '(' + pid + ')' + 'alive') else: print (program + '(' + pid + ')' + 'dead') os.system('echo `date +"%a %b %d %T"` /etc/init.d/' + program + ' restart >> /var/log/monPidFile')

crontab -e * * * * * /sbin/monPidFile