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To test the network between Windows 11 localhost and WSL2 ubuntu on Windows 11, I install tomcat9 on WSL2 ubuntu

$ sudo apt install tomcat9 -y
$ sudo systemctl enable tomcat9
$ sudo systemctl start tomcat9
$ sudo systemctl status tomcat9

The installation works successfully. The localhost:8080 connection on windows 11 web browser is successful without errors. This time I try to deploy Apache Flink service in WSL2 ubuntu on Windows 11. First I download Flink 1.18.1, unzip the Flink and make link with Flink-1.18.1

$ ln -s flink-1.18.1 flink

And I make the ubuntu service file

$ nano /usr/lib/systemd/system/flink.service
    
[Unit]
Description=Flink Service
    
[Service]
Type=forking
User=joseph
Group=joseph
ExecStart=/home/joseph/flink/bin/start-cluster.sh
ExecStop=/home/joseph/flink/bin/stop-cluster.sh
    
Restart=always
    
[Install]
WantedBy=multi-user.target

The Flink service starts with no error.

$ sudo systemctl enable flink
$ sudo systemctl start flink

Finally I open the Flink default port 8081 on Ubuntu firewall.

$ sudo ufw allow 8081/tcp

But http://localhost:8081 on Windows 11 web browser can not connect the Flink service on WSL2 ubuntu even if I can find the 8081 port is open like below,

$ netstat -tnl
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 127.0.0.53:53           0.0.0.0:*               LISTEN
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN
tcp6       0      0 127.0.0.1:8081          :::*                    LISTEN
tcp6       0      0 :::22                   :::*                    LISTEN
tcp6       0      0 :::8080                 :::*                    LISTEN

I can not understand the connection failure from Flink on WSL2 ubuntu. The tomcat9 is installed on WSL2 ubuntu the same way and localhost:8080 on Windows 11 brings no error. I need your advice desperately. Thanks!

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  • Two questions. (1) What's the error you are getting from attempting to connect from Windows, (2) Have you tried to connect from inside WSL with something like curl?
    – NotTheDr01ds
    Commented Feb 28 at 14:52
  • Also, is ufw really in play here? Usually it isn't running (and doesn't have much purpose in running) under WSL.
    – NotTheDr01ds
    Commented Feb 28 at 14:54
  • I solved it. This issue is the matter of Flink configuration. I set 'rest.bind-address: 0.0.0.0' in flink-conf.yaml file and it works successfully. Thanks any any.
    – Joseph Hwang
    Commented Feb 29 at 9:22
  • Good to hear - Consider putting in a self-answer to the question if you think it might be useful to others in the future. Thanks!
    – NotTheDr01ds
    Commented Feb 29 at 9:37

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