检查服务器的pid文件，如果文件不存在或pid对应的进程已死重启服务器

# -*- coding: utf-8 -*-# @author flynetcnimport sys, os, re, datetime;LOG_FILE = '/var/log/www/serverMonitor.log';SERVER_PID_FILE = '/var/log/www/server.pid';SERVER_NAME = 'myserver';START_SERVER_CMD = 'sh /bin/www/service/start.sh';def logger(level, str):logFd = open(LOG_FILE, 'a');logFd.write(datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S.%f')+": "+("WARNING " if level else "NOTICE ")+str);logFd.close();def startServer():import subprocess;logger(0, "start server...\n");logFd = open(LOG_FILE, 'a');ret = subprocess.call([START_SERVER_CMD], shell=True, stdout=logFd, stderr=logFd);logFd.close();if ret != 0:logger(1, "start server failed - %s\n" % (str(ret)));else:logger(0, "start server ok\n");def monitorServer():try:pidFd = open(SERVER_PID_FILE);pid = pidFd.readlines();except:pid = [];if not pid:logger(1, "pidfile is empty\n");startServer();return;pid = pid[0].strip();if not os.access('/proc/'+pid, os.R_OK):logger(1, "start server - process(pid:%s) not find\n" % (pid));startServer();return;elif SERVER_NAME not in open('/proc/'+pid+'/cmdline').readline():logger(1, "start server - process(pid:%s) is not %s\n" % (pid, SERVER_NAME));startServer();return;else:logger(0, "server is running - pid:%s\n" % (pid));return;if __name__ == "__main__":monitorServer();