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Container port mapping only work once per restart
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davidshen84
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Joined: 09 Aug 2008
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PostPosted: Sun Oct 21, 2018 10:29 am    Post subject: Container port mapping only work once per restart Reply with quote

Hi,

My system info.

    Gentoo 64 bit
    Docker version 18.03.1-ce, build 9ee9f40
    After I installed and started the docker service, I was able to launch the nginx container and access the welcome page.


Code:
docker run --rm -p 80:80 nginx:latest


But after I killed the container, and re-launch it with the same command, the container can start, but I cannot access the welcome page at http://localhost:80. I also found the browser did not say the connection was refused, instead, it just waits forever.

If I restart the docker service, I was able to create a new nginx container and access the welcome page. But, if I kill the container, the same issue re-occurs.

It feels like the port mapping function only works once.

Thanks,
D.
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davidshen84
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PostPosted: Tue Oct 23, 2018 7:41 am    Post subject: Reply with quote

Nobody uses docker on Gentoo, or I posted in the wrong section?
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forrestfunk81
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PostPosted: Mon Oct 29, 2018 4:06 pm    Post subject: Reply with quote

I stumbled upon the same problem some time ago. But usually I declare the exposed ports within a Dockerfile and build the container manually. Changing the ports works with this approach.
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guitou
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PostPosted: Wed Oct 31, 2018 12:42 pm    Post subject: Reply with quote

Hello.

I might be completely wrong, but I suppose running the container sets up a "network", while stopping the container does not remove this same network, thus leaving port 80 busy (mapping to an obsolete container).

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