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| 关键词： nbsp child 代码 import Python subprocess command stdout 进程 stderr |
Redhat下安装Python2.7rhel6.4自带的是2.6， 发现有的机器是python2.4。 到python网站下载源代码，解压到Redhat上，然后运行下面的命令：复制代码 代码如下:# ./configure --prefix=/usr/local/python27# make# make install这样安装之后默认不会启用Python2.7，需要使用/usr/local/python27/bin/python2.7调用新版本的python。而下面的安装方式会直接接管现有的python复制代码 代码如下:# ./configure# make# make install开始：服务子进程被监控主进程创建并监控，当子进程异常关闭，主进程可以再次启动之。使用了python的subprocess模块。就这个简单的代码，居然互联网上没有现成可用的例子。没办法，我写好了贡献出来吧。首先是主进程代码：service_mgr.py复制代码 代码如下:#!/usr/bin/python #-*- coding: UTF-8 -*- # cheungmine # stdin、stdout和stderr分别表示子程序的标准输入、标准输出和标准错误。 # # 可选的值有: # subprocess.PIPE - 表示需要创建一个新的管道. # 一个有效的文件描述符（其实是个正整数） # 一个文件对象 # None - 不会做任何重定向工作，子进程的文件描述符会继承父进程的. # # stderr的值还可以是STDOUT, 表示子进程的标准错误也输出到标准输出. # # subprocess.PIPE # 一个可以被用于Popen的stdin、stdout和stderr 3个参数的特输值，表示需要创建一个新的管道. # # subprocess.STDOUT # 一个可以被用于Popen的stderr参数的特输值，表示子程序的标准错误汇合到标准输出. ################################################################################ import os import sys import getopt import time import datetime import codecs import optparse import ConfigParser import signal import subprocess import select # logging # require python2.6.6 and later import logging from logging.handlers import RotatingFileHandler ## log settings: SHOULD BE CONFIGURED BY config LOG_PATH_FILE = "./my_service_mgr.log" LOG_MODE = 'a' LOG_MAX_SIZE = 4*1024*1024 # 4M per file LOG_MAX_FILES = 4 # 4 Files: my_service_mgr.log.1, printmy_service_mgrlog.2, ... LOG_LEVEL = logging.DEBUG LOG_FORMAT = "%(asctime)s %(levelname)-10s[%(filename)s:%(lineno)d(%(funcName)s)] %(message)s" handler = RotatingFileHandler(LOG_PATH_FILE, LOG_MODE, LOG_MAX_SIZE, LOG_MAX_FILES) formatter = logging.Formatter(LOG_FORMAT) handler.setFormatter(formatter) Logger = logging.getLogger() Logger.setLevel(LOG_LEVEL) Logger.addHandler(handler) # color output # pid = os.getpid() def print_error(s): print '\033[31m[%d: ERROR] %s\033[31;m' % (pid, s) def print_info(s): print '\033[32m[%d: INFO] %s\033[32;m' % (pid, s) def print_warning(s): print '\033[33m[%d: WARNING] %s\033[33;m' % (pid, s) def start_child_proc(command, merged): try: if command is None: raise OSError, "Invalid command" child = None if merged is True: # merge stdout and stderr child = subprocess.Popen(command, stderr=subprocess.STDOUT, # 表示子进程的标准错误也输出到标准输出 stdout=subprocess.PIPE # 表示需要创建一个新的管道 ) else: # DO NOT merge stdout and stderr child = subprocess.Popen(command, stderr=subprocess.PIPE, stdout=subprocess.PIPE) return child except subprocess.CalledProcessError: pass # handle errors in the called executable except OSError: pass # executable not found raise OSError, "Failed to run command!" def run_forever(command): print_info("start child process with command: " + ' '.join(command)) Logger.info("start child process with command: " + ' '.join(command)) merged = False child = start_child_proc(command, merged) line = '' errln = '' failover = 0 while True: while child.poll() != None: failover = failover + 1 print_warning("child process shutdown with return code: " + str(child.returncode)) Logger.critical("child process shutdown with return code: " + str(child.returncode)) print_warning("restart child process again, times=%d" % failover) Logger.info("restart child process again, times=%d" % failover) child = start_child_proc(command, merged) # read child process stdout and log it ch = child.stdout.read(1) if ch != '' and ch != '\n': line += ch if ch == '\n': print_info(line) line = '' if merged is not True: # read child process stderr and log it ch = child.stderr.read(1) if ch != '' and ch != '\n': errln += ch if ch == '\n': Logger.info(errln) print_error(errln) errln = '' Logger.exception("!!!should never run to this!!!") if __name__ == "__main__": run_forever(["python", "./testpipe.py"]) 然后是子进程代码：testpipe.py复制代码 代码如下:#!/usr/bin/python #-*- coding: UTF-8 -*- # cheungmine # 模拟一个woker进程,10秒挂掉 import os import sys import time import random cnt = 10 while cnt >= 0: time.sleep(0.5) sys.stdout.write("OUT: %s\n" % str(random.randint(1, 100000))) sys.stdout.flush() time.sleep(0.5) sys.stderr.write("ERR: %s\n" % str(random.randint(1, 100000))) sys.stderr.flush() #print str(cnt) #sys.stdout.flush() cnt = cnt - 1 sys.exit(-1) Linux上运行很简单：复制代码 代码如下:$ python service_mgr.pyWindows上以后台进程运行：复制代码 代码如下:> start pythonw service_mgr.py代码中需要修改：复制代码 代码如下:run_forever(["python", "testpipe.py"]) |
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