检查守护进程是否正在运行
问题描述:
我正在运行几个守护进程,我需要维护一个日志以检查在每隔15分钟的时间间隔后哪些进程正在运行。代码中,我试图执行的检查守护进程是否正在运行
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
我用下面的命令
python daemon_name.py start
答
,我将发布一些代码,成功地执行你的第一个命令启动所有这些后台程序线程,你在demo
存储结果和从它你可以推断如何得到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()
下一次当您遇到问题时,请解释您尝试过的内容并进行搜索。如果你研究了如何从Python执行进程,你会发现子进程。从那里,你可以用Python搜索如何在Python之间的流程之间建立联系,并得到类似的解决方案。
答
您还可以使用python中提供的threading
模块。如果你在同一个进程中运行下面的命令,这会给你更多关于由daemon_name.py进程创建的守护进程线程的信息。
获取线程数:
In [12]: threading.activeCount()
Out[12]: 26
列出所有活动的线程:
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'
我希望这有助于。