Docker for Rails Developers

Quick Recap

Now that you’ve had your first taste of Docker, let’s pause for a moment to catch our breath and review what we’ve learned.

In this chapter:

1. We installed Docker on our machines.

2. We ran our first ever Docker command, a helloworld Ruby script, without needing Ruby installed on our machine.

   $ docker run ruby:2.6 ruby -e "puts :hello"

3. We saw how to list our running containers with docker ps and all containers (including stopped ones) with docker ps -a.

4. We deleted our old containers with docker rm <container id> and saw how to create throwaway containers using the docker run’s --rm option.

5. We generated a new Rails project using a container by:

   • Starting an interactive Bash shell running inside a container

     $