How to build a Ruby On Rails project in Codefresh
Ruby on Rails is a very popular development framework that combines ease of use and a great amount of programming languages. In Codefresh, ROR projects behave like any other web application. You can easily build them, run integration tests and launch them on demo environments.
The example application is located at https://github.com/codefresh-contrib/ruby-on-rails-sample-app.
Dockerize your Ruby on Rails project
The first step should be to write a Dockerfile for your Rails project. As an example we will use the following:
Notice the order of commands and especially the fact that we copy the
Gemfile on its own first, so that we take advantage of the Docker layer caching.
Codefresh also supports multi-stage docker builds. You can use one parent docker image for preparing your gem modules and another one for actually deployment the application.
Once you have a Dockerfile, creating a pipeline in Codefresh is very easy either from the GUI or with the yaml syntax.
Simple pipeline with Docker image and unit tests
A very simple pipeline is one that has only two steps:
- We build the docker image
- We run the tests inside the docker image that was just build
Here is the example codefresh.yml file.
The first step is a build step named
BuildingDockerImage. It reads the Dockerfile and creates a Docker image out of it. The second step is a freestyle step called
RunningUnitTests. It uses the image mentioned in the first step and executes custom commands inside it.
Inspecting your Docker image
All Codefresh accounts come with a built-in Docker registry. Codefresh automatically pushes the last successful image of a pipeline to this internal registry.
You can see all your latest Docker artifacts by selecting Images from the left sidebar
You can click on the image and get extra details. One of the tabs contains a visual explanation of the layers contained in the image. This view can be helpful when you are trying to make your Docker images smaller (which is a recommended practice)
In Codefresh you can also use any other external registry such as Dockerhub, Azure, Google etc.
Previewing the Ruby on Rails application in a Demo environment
Codefresh has the unique capability of launching Docker images within its infrastructure for a quick demonstration (e.g. to customers and colleagues).
In the example Rails repository the default development “environment” is self-contained (it uses sqlite for a database). This makes it very easy to preview.
Launch the environment by clicking at the rocket icon in the images view.
A new build will start. Once it is complete your new environment will be created. You can inspect it by clicking in the Docker Swarm menu on the left sidebar and then clicking Environments.
Click the Open App icon on the right and your browser will open a new tab with the environment.
You can share this link with other people in your team.
Demo environments are not intended for production purposes. Use them only for quick feedback. They also shut-down automatically after a period of inactivity.