This is a basic scaffolded Rails project using Docker with Ruby 2.6.5, Rails 5.2.4, and Postgres 12.1. This project can be used in lieu of installing Ruby, Rails and Postgres on your machine. When you run docker-compose up, Docker will create two containers on your machine: a Ruby/Rails environment running the local server and a Postgres container where your database is stored.
You will need to uncomment the following line in Dockerfile for the entrypoint.sh script to run correctly:
RUN sed -i -e 's/\r$//' /usr/bin/entrypoint.sh
This line switches the line ending format so it works correctly with Windows. (Note that if the line above is uncommented, the script won't run correctly with Mac machines.)
- Run
docker-compose upto run the local server atlocalhost:3000. However, if you go tolocalhost:3000, you will see the DB is not set up yet.
To access a shell environment to run rails c, run migrations, or run other rake and rails tasks such as rails routes, you'll need to do the following.
Run the following command in the root directory of the project:
$ docker-compose run web sh
It's not necessary for the containers to be running (with $ docker-compose up).
This will open a shell where you can run any commands in the web application's environment. This includes the following commands:
$ bundle exec rake db:create(and any other Rake commands)$ rails routesand$ rails c(as well as any other Rails commands)$ bundle exec rspec(to run tests)$ irb(if you just need a basic Ruby REPL)
You'll need to complete the following steps:
-
First, add the gems to the project.
-
Run
docker-compose run web bundle install. This will bundle the new gems. -
Next, run
docker-compose up --build. This will rebuild the project.
To read Docker's documentation on running projects using Ruby and Rails, see Quickstart: Compose and Rails.