Starter files for running a sinatra app in docker. Great for quick json apis.

$ brew install docker

My preferred way of running docker on OS X is with boot2docker-xhyve.

$ brew install xhyve
$ git clone https://github.com/ailispaw/boot2docker-xhyve
$ cd boot2docker-xhyve
$ make

Though this is a single container application, Docker Compose makes it easy to start and stop docker containers with a shared volume, a specified port, and environment variables.

curl -L https://github.com/docker/compose/releases/download/1.4.2/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose

docker-compose build

docker-compose up

Your server is now running on port 3000 of your docker ip which you can get from running make ip from within the boot2docker-xhyve directory. It will probably look something like http://192.168.64.2:3000/users.

docker-compose stop

The rerun gem is supposed to help with changes automatically being reloaded but I don't think it is working the way it should. The main server.rb file is using Sinatra Reloader so any changes to server.rb should get picked up. But changes to other files will require a docker-compose stop and docker-compose start which is not ideal.

Because the server is running on the vm, the docker ip is only visible to your machine which means the simulator can talk to it but your external device can not. Luckily it is not to hard to port-forward on mac osx.

1. Turn on Remote Login in System Preferences -> Sharing
2. Run the command below replacing the first ip address with your own (192.168.0.102) and the second ip address with your docker ip (192.168.64.21).

ssh -L 192.168.0.102:3000:192.168.64.2:3000 -N 127.0.0.1

The command starts a process that forwards the port. Once you kill the process the port is no longer forwarded which is nice.