Node / Express app can't connect to docker mongodb

Question

I want to run a node app that uses express and connects to a (boot2docker) docker mongo container.

When I first wrote the app, I was using a locally installed instan

Answer 1

You need to publish the appropriate port on the container with the -p argument i.e:

docker run -p 27017:27017 -v "$(pwd)":/data --name mongo -d mongo mongod --smallfiles

The will make port 27017 accessible on the host (the VM in your case) and forward traffic to port 27017 on the container.