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dockerboot2docker

expose docker containers application port to host on windows using boot2docker

So far I have:

  1. installed boot2docker 1.6.0 on WIN7
  2. created a container using ubuntu:14.01 base image
  3. installed an application and committed it so that now I have a new image "demotest_core"

The issue that I am running into is that when I start my container using this command

docker run -it --name demotest --rm -p 127.0.0.1:15000:1500 -v /c/Users/b101/shared:/mnt/shared ubuntu/demotest_core bin/bash

the container starts, after that I cd to my application's dir and start the application (its a web application that runs on port 1500) the application starts successfully on the container and I can see it in LISTENING mode when I do netstat. I would like to access this app on my host WIN7 system but when I try http://127.0.0.1:15000 I get connection refused error.

Using another terminal I can clearly see that the port mapping is in place but I am not able to access it on the host

C:\Users\b101>docker port demotest
1500/tcp -> 127.0.0.1:15000

I have also tried this command thinking that first I need to expose the PORT and then MAP it but it didn't work

docker run -it --name demotest --expose 1500 --rm -p 127.0.0.1:15000:1500 -v /c/Users/b101/shared:/mnt/shared ubuntu/demotest_core bin/bash
Solution

  • If you're using docker-machine, that port is exposed in the VM, not your local Win7 machine.

    Change -p 127.0.0.1:15000:1500 to just 15000:1500 and then try accessing port 15000 at the IP Address given at docker-machine ip default.

    You can't use 127.0.0.1 in the port mapping as that will only bind to the local interface which won't be accessible from outside the VM.