为什么我的 Bottle 服务器在启动时失败？

Question

我已经使用 python 和 bottle 以及一个 systemd 单元编写了一个小服务器，将其作为服务安装在 xubuntu 上。 python 脚本按预期工作，如果我从命令行 (sudo systemctl advairMeter) 启动它，该服务工作正常，但它在系统启动时失败。

这是我的 .service 文件：

saul@linuxBox:~/Desktop$ cat /etc/systemd/system/advairMeter.service
[Unit]
Description=Advair meter
After=network.target

[Service]
ExecStart=/usr/bin/python3  server.py
Restart=always
WorkingDirectory=/home/saul/Projects/PythonProjects/medSched/

[Install]
WantedBy=multi-user.target

这是重启时发生的情况：

Apr 09 08:43:49 linuxBox systemd[1]: Started Advair meter.
Apr 09 08:43:49 linuxBox python3[1176]: Bottle v0.12.19 server starting up (using WSGIRefServer())...
Apr 09 08:43:49 linuxBox python3[1176]: Listening on http://192.168.1.103:8080/
Apr 09 08:43:49 linuxBox python3[1176]: Hit Ctrl-C to quit.
Apr 09 08:43:50 linuxBox python3[1176]: Traceback (most recent call last):
Apr 09 08:43:50 linuxBox python3[1176]:   File "server.py", line 95, in <module>
Apr 09 08:43:50 linuxBox python3[1176]:     run(host='192.168.1.103', port=8080)
Apr 09 08:43:50 linuxBox python3[1176]:   File "/usr/local/lib/python3.8/dist-packages/bottle.py", line 3137, in run
Apr 09 08:43:50 linuxBox python3[1176]:     server.run(app)
Apr 09 08:43:50 linuxBox python3[1176]:   File "/usr/local/lib/python3.8/dist-packages/bottle.py", line 2789, in run
Apr 09 08:43:50 linuxBox python3[1176]:     srv = make_server(self.host, self.port, app, server_cls, handler_cls)
Apr 09 08:43:50 linuxBox python3[1176]:   File "/usr/lib/python3.8/wsgiref/simple_server.py", line 154, in make_server
Apr 09 08:43:50 linuxBox python3[1176]:     server = server_class((host, port), handler_class)
Apr 09 08:43:50 linuxBox python3[1176]:   File "/usr/lib/python3.8/socketserver.py", line 452, in __init__
Apr 09 08:43:50 linuxBox python3[1176]:     self.server_bind()
Apr 09 08:43:50 linuxBox python3[1176]:   File "/usr/lib/python3.8/wsgiref/simple_server.py", line 50, in server_bind
Apr 09 08:43:50 linuxBox python3[1176]:     HTTPServer.server_bind(self)
Apr 09 08:43:50 linuxBox python3[1176]:   File "/usr/lib/python3.8/http/server.py", line 138, in server_bind
Apr 09 08:43:50 linuxBox python3[1176]:     socketserver.TCPServer.server_bind(self)
Apr 09 08:43:50 linuxBox python3[1176]:   File "/usr/lib/python3.8/socketserver.py", line 466, in server_bind
Apr 09 08:43:50 linuxBox python3[1176]:     self.socket.bind(self.server_address)
Apr 09 08:43:50 linuxBox python3[1176]: OSError: [Errno 99] Cannot assign requested address
Apr 09 08:43:50 linuxBox systemd[1]: advairMeter.service: Main process exited, code=exited, status=1/FAILURE
Apr 09 08:43:50 linuxBox systemd[1]: advairMeter.service: Failed with result 'exit-code'.
Apr 09 08:43:50 linuxBox systemd[1]: advairMeter.service: Scheduled restart job, restart counter is at 4.
Apr 09 08:43:50 linuxBox systemd[1]: Stopped Advair meter.

现在是上面journalctl输出的第一部分，

Bottle v0.12.19 server starting up (using WSGIRefServer())...
Listening on http://192.168.1.103:5678/
Hit Ctrl-C to quit.

是我看到的，如果我只是运行带有 python3 server.py 的 python 脚本，所以看起来脚本实际执行了，然后地址可以'没有被分配，因为已经有一个套接字在使用它，但是为什么重启完成后没有进程监听 post？

python脚本本身很简单，

<SNIP>
@route('/')
@auth_basic(is_authenticated_user)
def home():
   <SNIP>
run(host='192.168.1.103', port=8080)

我假设错误出在我的 .service 文件中，但我无法在网上找到任何告诉我如何修复它的信息。这是我第一次同时使用 bottle 和 systemd，所以我可能会犯一个非常简单的错误。

Answer 1

您的服务很可能运行在您的网络在启动期间设置之前。这意味着您的 OS 没有任何可侦听的网络接口，因此您的脚本将失败。要解决此问题，请将 [Unit] 部分更改为：

[Unit]
Description=Advair meter
Wants=network-online.target
After=network.target network-online.target

您可以查看 Cause a script to execute after networking has started? 了解更多详情。

为什么我的 Bottle 服务器在启动时失败？

Why does my bottle server fail at startup?

linux

systemd

bottle