[英]Python script as linux service/daemon
Hallo, 你好,
I'm trying to let a python script run as service (daemon) on (ubuntu) linux. 我想让一个python脚本在(ubuntu)linux上作为服务(守护进程)运行。
On the web there exist several solutions like: 在网上有几个解决方案,如:
http://pypi.python.org/pypi/python-daemon/ http://pypi.python.org/pypi/python-daemon/
A well-behaved Unix daemon process is tricky to get right, but the required steps are much the same for every daemon program. 一个表现良好的Unix守护进程很难做到,但每个守护进程程序所需的步骤大致相同。 A DaemonContext instance holds the behaviour and configured process environment for the program; DaemonContext实例保存程序的行为和配置的进程环境; use the instance as a context manager to enter a daemon state. 使用实例作为上下文管理器来进入守护程序状态。
http://www.jejik.com/articles/2007/02/a_simple_unix_linux_daemon_in_python/ http://www.jejik.com/articles/2007/02/a_simple_unix_linux_daemon_in_python/
However as I want to integrate my python script specifically with ubuntu linux my solution is a combination with an init.d script 但是,由于我想将我的python脚本专门与ubuntu linux集成,我的解决方案是与init.d脚本的组合
#!/bin/bash
WORK_DIR="/var/lib/foo"
DAEMON="/usr/bin/python"
ARGS="/opt/foo/linux_service.py"
PIDFILE="/var/run/foo.pid"
USER="foo"
case "$1" in
start)
echo "Starting server"
mkdir -p "$WORK_DIR"
/sbin/start-stop-daemon --start --pidfile $PIDFILE \
--user $USER --group $USER \
-b --make-pidfile \
--chuid $USER \
--exec $DAEMON $ARGS
;;
stop)
echo "Stopping server"
/sbin/start-stop-daemon --stop --pidfile $PIDFILE --verbose
;;
*)
echo "Usage: /etc/init.d/$USER {start|stop}"
exit 1
;;
esac
exit 0
and in python: 并在python中:
import signal
import time
import multiprocessing
stop_event = multiprocessing.Event()
def stop(signum, frame):
stop_event.set()
signal.signal(signal.SIGTERM, stop)
if __name__ == '__main__':
while not stop_event.is_set():
time.sleep(3)
My question now is if this approach is correct. 我现在的问题是这种方法是否正确。 Do I have to handle any additional signals? 我是否必须处理任何其他信号? Will it be a "well-behaved Unix daemon process"? 它会是一个“表现良好的Unix守护进程”吗?
Assuming your daemon has some way of continually running (some event loop, twisted, whatever), you can try to use upstart
. 假设您的守护进程有某种持续运行的方式(某些事件循环,扭曲,等等),您可以尝试使用upstart
。
Here's an example upstart config for a hypothetical Python service: 这是一个假设的Python服务的示例upstart配置:
description "My service"
author "Some Dude <blah@foo.com>"
start on runlevel [234]
stop on runlevel [0156]
chdir /some/dir
exec /some/dir/script.py
respawn
If you save this as script.conf to /etc/init
you simple do a one-time 如果将此文件作为script.conf保存到/etc/init
,则只需执行一次
$ sudo initctl reload-configuration
$ sudo start script
You can stop it with stop script
. 你可以用stop script
来阻止它。 What the above upstart conf says is to start this service on reboots and also restart it if it dies. 以上新贵的说法是在重启时启动此服务,如果它死了也重新启动它。
As for signal handling - your process should naturally respond to SIGTERM
. 至于信号处理 - 您的过程应该自然地响应SIGTERM
。 By default this should be handled unless you've specifically installed your own signal handler. 默认情况下,除非您专门安装了自己的信号处理程序,否则应该进行处理。
Rloton's answer is good. Rloton的答案很好。 Here is a light refinement, just because I spent a ton of time debugging. 这是一个轻量级的改进,只是因为我花了很多时间调试。 And I need to do a new answer so I can format properly. 我需要做一个新的答案,这样我才能正确格式化。
A couple other points that took me forever to debug: 还有几个让我永远调试的要点:
Here is my version: 这是我的版本:
description "My service"
author "Some Dude <blah@foo.com>"
env PYTHON_HOME=/<pathtovirtualenv>
env PATH=$PYTHON_HOME:$PATH
start on runlevel [2345]
stop on runlevel [016]
chdir <directory>
# NO expect stanza if your script uses python-daemon
exec $PYTHON_HOME/bin/python script.py
# Only turn on respawn after you've debugged getting it to start and stop properly
respawn
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