问题运行 tcp 服务器通过 systemd 服务获取已在使用的地址

Question

我正在尝试运行 SocketServer.TCPServer

昨天半夜我放代码审核

https://codereview.stackexchange.com/q/232879/22943、

但是我无法让 TCPServer 与 Systemd 一起工作，现在今天我终于指出了整个问题出在运行正在查看 [= 的 TCPServer 16=]日志。

Nov 24 13:33:06 rockpro64 systemd[1393]: Started TCP Server to recieve data from Particle Photon to upload to MySql
Nov 24 13:33:06 rockpro64 python3[1733]: inside main module.
Nov 24 13:33:06 rockpro64 python3[1733]: Traceback (most recent call last):
Nov 24 13:33:06 rockpro64 python3[1733]:   File "/usr/local/iot/home_iot/tcpserver.py", line 92, in <module>
Nov 24 13:33:06 rockpro64 python3[1733]:     main()
Nov 24 13:33:06 rockpro64 python3[1733]:   File "/usr/local/iot/home_iot/tcpserver.py", line 83, in main
Nov 24 13:33:06 rockpro64 python3[1733]:     server = Server(server_address, ParticlePhotonRequestHandler)
Nov 24 13:33:06 rockpro64 python3[1733]:   File "/usr/local/iot/home_iot/tcpserver.py", line 58, in __init__
Nov 24 13:33:06 rockpro64 python3[1733]:     TCPServer.__init__(self, server_address, handler_cls, bind_and_activat
Nov 24 13:33:06 rockpro64 python3[1733]:   File "/usr/lib/python3.6/socketserver.py", line 456, in __init__
Nov 24 13:33:06 rockpro64 python3[1733]:     self.server_bind()
Nov 24 13:33:06 rockpro64 python3[1733]:   File "/usr/lib/python3.6/socketserver.py", line 470, in server_bind
Nov 24 13:33:06 rockpro64 python3[1733]:     self.socket.bind(self.server_address)
Nov 24 13:33:06 rockpro64 python3[1733]: OSError: [Errno 98] Address already in use
Nov 24 13:33:06 rockpro64 systemd[1393]: photon_uploader.service: Main process exited, code=exited, status=1/FAILUR
Nov 24 13:33:06 rockpro64 systemd[1393]: photon_uploader.service: Failed with result 'exit-code'.

从我的服务单位，我已经摆脱了socket并做了一个简化版本：

[Unit]
Description=TCP Server to recieve data from Particle Photon to upload to MySql.
After=multi-user.target
Wants=network-online.target
After=network-online.target


[Service]
Type=idle
RestartSec=6
EnvironmentFile=/home/rock64/.config/systemd/user/photon_uploader.env
ExecStart=/usr/bin/python3 /usr/local/iot/home_iot/tcpserver.py

[Install]
WantedBy=multi-user.target

我仍然遇到同样的错误Address Already in use

Answer 1

地址已被使用主要有两个原因：

该地址实际上正被另一个运行进程使用。您可以通过运行 netstat -pnutl
该地址已被同一进程先前进行的绑定尝试使用，没有时间正确关闭。通过打开套接字选项 SO_REUSEADDR 有一个简单的解决方案： s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

问题运行 tcp 服务器通过 systemd 服务获取已在使用的地址

Problem running tcp server via systemd service getting address already in use

python-3.x

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问题 运行 tcp 服务器通过 systemd 服务获取已在使用的地址

Problem running tcp server via systemd service getting address already in use

python-3.x

sockets

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问题运行 tcp 服务器通过 systemd 服务获取已在使用的地址