检查守护进程是否正在运行

Question

我是运行几个守护进程，我需要维护一个日志以在每 15 分钟的时间间隔后检查哪些进程是运行。我尝试实现的代码是

def monitor_deamons():
   print "starting monitor"
   demo = ps -ef | grep -v grep | grep daemon #fails
   print demo
   PROCESSCOUNT=(ps -ef |grep -v grep |grep -cw <daemon name> #fails
   print PROCESSCOUNT

我通过以下命令启动所有这些守护线程

python daemon_name.py start

Answer 1

我将 post 一些成功执行您的第一个命令的代码，您存储在 demo 中的结果，您可以从中推断如何获得 PROCESS_COUNT.

import subprocess

def monitor_deamons():
   print "starting monitor"

   ps = subprocess.Popen(('ps', '-ef'), stdout=subprocess.PIPE)
   grep = subprocess.Popen(('grep', '-v', 'grep'), stdin=ps.stdout, stdout=subprocess.PIPE)

   ps.stdout.close()  # Allow ps to receive a SIGPIPE if grep exits.

   grep_daemon = subprocess.Popen(('grep', 'daemon'), stdin=grep.stdout)

   grep.stdout.close() # Allow grep to receive a SIGPIPE if grep_daemon exits

   output = grep_daemon.communicate()[0]

   print output

monitor_deamons()

下次您运行遇到问题时，请说明您尝试过和搜索过的内容。如果您研究过如何从 Python 执行流程，您会发现子流程。从那里你可以用谷歌搜索如何在 Python 中的进程之间进行管道传输，并得出与我的类似的解决方案。

Answer 2

您还可以使用 python 中提供的 threading 模块。如果您运行在同一进程中执行以下命令，这将为您提供有关 daemon_name.py 进程创建的守护线程的更多信息。

获取线程数：

In [12]: threading.activeCount()
Out[12]: 26

列出所有活动线程：

In [5]: threading.enumerate()
Out[5]: 
[<HistorySavingThread(IPythonHistorySavingThread, started 140361105082112)>,
 <Thread(Thread-17, started daemon 140359321511680)>,
 <Thread(Thread-9, started daemon 140359866775296)>,
 <Thread(Thread-22, started daemon 140359279548160)>,
 <Thread(Thread-5, started daemon 140360376239872)>,
 <Thread(Thread-18, started daemon 140359313118976)>,
 <Thread(Thread-10, started daemon 140359858382592)>,
 <Thread(Thread-20, started daemon 140359296333568)>,
 <Thread(Thread-21, started daemon 140359287940864)>,
 <Thread(Thread-13, started daemon 140359833204480)>,
 <Thread(Thread-16, started daemon 140359329904384)>,
 <_MainThread(MainThread, started 140361348196160)>,
 <Thread(Thread-19, started daemon 140359304726272)>]

访问任何线程并执行任何操作。

In [8]: t17 = threading.enumerate()[1]

In [9]: t17.
t17.daemon     t17.getName    t17.ident      t17.isAlive    t17.isDaemon   t17.is_alive   t17.join       t17.name       t17.run        t17.setDaemon  t17.setName    t17.start      

In [9]: t17.getName()
Out[9]: 'Thread-17'

希望对您有所帮助。

检查守护进程是否正在运行

Check if daemon process is runnning

python

django

daemon

process