![]() The Dockerfile needs more instructions to build out the application. Ruby 2.4.0-alpine 18dbdfdbe6bd 5 weeks ago 60.8 MB At this point, you now have an image created, and running docker images will show you the images you have available: REPOSITORY TAG IMAGE ID CREATED SIZE With only one instruction in the Dockerfile, this doesn't do too much, but it does show you the build process without too much happening. Status: Downloaded newer image for ruby:2.4.0-alpine , you will see something similar to the following: Sending build context to Docker daemon 284.7 kBĭigest: sha256:49cd3c5e577ff2898fa7ff82271f4ccf1054d12adc7f7a6595da87b35f9f3972 For more details about why I'm using alpine here over the other options, you can read this post. There are several choices, but this project uses the ruby:2.4.0-alpine image. The first instruction, FROM, will tell Docker to use the prebuilt Ruby image. Open the newly created Dockerfile in your favorite editor. In the root directory of the application, create a new Dockerfile. However, the Docker ecosystem has an image repository with a Ruby image already created and ready to use. You can set this up by installing Ruby and all of its dependencies. ![]() The Dockerfile contains all of the instructions used to build out the application image. Creating the DockerfileĪt the foundation of any Dockerized application, you will find a Dockerfile. Once you have everything set up, you can move on to the next section. Some of the setup here is specific for this application, and the needs of your application may not be covered, but it should be a good starting point for you to get the concepts needed to Dockerize your own applications. The todo app here is essentially a stand-in, and you could replace it with your own application. This tutorial requires you to have a few items before you can get started.ĭownload Todo app example - Non- Docker branch In this post, I will cover the first part: developing and testing with Docker Compose. In a two-part series, I will cover the development and pipeline creation steps. To provide an example of how you might move to containerized development, I built a simple todo API with Ruby on Rails and PostgreSQL using Docker Compose for development, testing, and eventually in my CI/CD pipeline. It allows us to build and replicate images on any host, removing the inconsistencies of dev environments and reducing onboarding timelines considerably. ![]() Docker is an amazing tool for developers.
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