Docker port expose

Question

As a follow up to Linking Docker Containers

I've linked both a mongo, redis container with my nodejs app container successfully. My node app is now running inside my container but for some reason I can't access it:

CONTAINER ID        IMAGE                     COMMAND                CREATED             STATUS              PORTS                    NAMES
3f8790bb7cc5        mseay/myapp:latest        "/bin/bash"            2 minutes ago       Up 2 minutes        0.0.0.0:3000->3000/tcp   myapp
5470cdd876eb        redis:latest              "/entrypoint.sh redi   About an hour ago   Up About an hour    6379/tcp                 redis
36c61197d8bd        mongo:latest              "/entrypoint.sh mong   About an hour ago   Up About an hour    27017/tcp                mongo

Inside my container, my node app is running on port 3000. My docker run command specifies to map 3000 in my container to 3000 on my host:

docker run -i -t -p 3000:3000 --name myapp --link mongo:MONGODB --link redis:REDIS mseay/myapp /bin/bash

docker port shows

3000/tcp -> 0.0.0.0:3000

But, when I goto localhost:3000 or try to curl it:

curl: (7) Failed to connect to localhost port 3000: Connection refused

Apologies for being noobish. Any help is always greatly appreciated!

Answer 1

The issue is that you're using boot2docker. The ports are published on the virtual machine running docker. You can get the ip address of that vm by running boot2docker ip.

So, for your service on port 3000, you could run:

curl http://$(boot2docker ip):3000/