Cherrypy 守护进程关闭失败

Question

我已经关注了 Cherrypy 守护进程 webapp 框架 Deploying CherryPy (daemon)，这很棒。但我遇到了关机问题。

有问题的服务器正在使用端口 8082。当关闭来自 init.d 脚本时，它会命中 webapp-cherryd 等效项，然后引发错误。 XXX@mgmtdebian7:/etc/init.d# ./XXX 停止

[11/Jul/2014:09:39:25] ENGINE Listening for SIGHUP.
[11/Jul/2014:09:39:25] ENGINE Listening for SIGTERM.
[11/Jul/2014:09:39:25] ENGINE Listening for SIGUSR1.
[11/Jul/2014:09:39:25] ENGINE Bus STARTING
[11/Jul/2014:09:39:25] ENGINE Started monitor thread 'Autoreloader'.
[11/Jul/2014:09:39:25] ENGINE Started monitor thread '_TimeoutMonitor'.
[11/Jul/2014:09:39:30] ENGINE Error in 'start' listener <bound method Server.start of <cherrypy._cpserver.Server object at 0xe60e10>>
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/CherryPy-3.2.4-py2.7.egg/cherrypy/process/wspbus.py", line 197, in publish
    output.append(listener(*args, **kwargs))
  File "/usr/local/lib/python2.7/dist-packages/CherryPy-3.2.4-py2.7.egg/cherrypy/_cpserver.py", line 151, in start
    ServerAdapter.start(self)
  File "/usr/local/lib/python2.7/dist-packages/CherryPy-3.2.4-py2.7.egg/cherrypy/process/servers.py", line 168, in start
    wait_for_free_port(*self.bind_addr)
  File "/usr/local/lib/python2.7/dist-packages/CherryPy-3.2.4-py2.7.egg/cherrypy/process/servers.py", line 412, in wait_for_free_port
    raise IOError("Port %r not free on %r" % (port, host))
IOError: Port 8080 not free on '127.0.0.1'

[11/Jul/2014:09:39:30] ENGINE Shutting down due to error in start listener:
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/CherryPy-3.2.4-py2.7.egg/cherrypy/process/wspbus.py", line 235, in start
    self.publish('start')
  File "/usr/local/lib/python2.7/dist-packages/CherryPy-3.2.4-py2.7.egg/cherrypy/process/wspbus.py", line 215, in publish
    raise exc
ChannelFailures: IOError("Port 8080 not free on '127.0.0.1'",)

[11/Jul/2014:09:39:30] ENGINE Bus STOPPING
[11/Jul/2014:09:39:30] ENGINE HTTP Server cherrypy._cpwsgi_server.CPWSGIServer(('127.0.0.1', 8080)) already shut down
[11/Jul/2014:09:39:30] ENGINE Stopped thread '_TimeoutMonitor'.
[11/Jul/2014:09:39:30] ENGINE Stopped thread 'Autoreloader'.
[11/Jul/2014:09:39:30] ENGINE Bus STOPPED
[11/Jul/2014:09:39:30] ENGINE Bus EXITING
[11/Jul/2014:09:39:30] ENGINE Bus EXITED
XXX@mgmtdebian7:/etc/init.d# 

从我到目前为止所做的冲浪中，我相信该服务正在尝试重新启动以响应 SIGHUP 信号，并且它正在使用默认端口 8080（这不是而且不应该是免费的) 并因此失败。

这会让服务继续运行——这不是我们想要的......

顺便说一句，我将端口设置为 8082 的配置在我加载的模块内 - 而不是在配置文件中。

感谢任何期待的指点。

Answer 1

正如日志中明确指出的那样，CherryPy 正在尝试在 127.0.0.1:8080 上启动并在 5 秒后失败。所以你实际上有一个启动失败，很可能是因为在 我的配置中将端口设置为 8082 是在我加载的模块中 - 而不是在配置文件中 你没有正确设置端口CherryPy 使用默认的 8080。

我还想指出，您不应该在生产中使用Autoreloader。 cherrypy-webapp-skeleton init.d 脚本设置 production CherryPy environment 已关闭 Autoreloader。

Answer 2

所以当你这样做时

cherrypy.tree.graph(app, "/") 

默认情况下，您会在 localhost:8080 上创建一个服务器实例，但在您调用 cherrypy.engine.start() 之前它实际上并没有开始。

你可能正在做这样的事情

例如：

    cherrypy.tree.graft(app, "/") # registers a server on localhost:8080

    server = cherrypy._cpserver.Server() # registers a second server...
    server.socket_host="0.0.0.0" # ..on 0.0.0.0 ...
    server.socket_port = 5002 # ..with port 5002
    server.thread_pool = 10
    server.subscribe()

    cherrypy.engine.start() #starts two server instances
    cherrypy.engine.block()

将导致cherry py启动两个服务器实例，一个在localhost:8080，另一个在5002。

答案是这样做：

    cherrypy.tree.graft(app, "/")
    cherrypy.server.unsubscribe() # very important gets rid of default.

    server = cherrypy._cpserver.Server()
    server.socket_host="0.0.0.0"
    server.socket_port = 5002
    server.thread_pool = 10
    server.subscribe()

    cherrypy.engine.start() #now starts only one server instance
    cherrypy.engine.block()

您上面的问题是您正在盯着两台服务器，并且其中只有一个正在崩溃/出错/关闭，因此端口 8080 仍然绑定到本地主机并防止重新启动..