This is a simple project that I used to introduce myself to Docker. Here I take an elementary Ruby script and dockerise it in a container.

I'm well-aware of how practically pointless this is and that Docker is mostly used for web applications, servers, infrastructure and distributed systems more generally. But this was actually a great way to get started.

I'm already convinced that Docker is seriously awesome and useful!

Assuming you have Docker installed, enter this directory and execute the following commands

docker build --tag test .
docker run --interactive --tty test /bin/sh

This should place you on the command line inside the container. Then run the command ruby sum.rb. You can use Ctrl+D to exit the container.

To delete the image we built here just run docker rmi -f test.

Some good sources for learning the basics of Docker...

• you need to learn Docker RIGHT NOW!!

• A Docker “hello world” app

• Docker concepts and terminology

• Docker Docs