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Language Guide: Crystal

Tutorials & 2.0 Sample Apps > Language Guide: Crystal

This guide will help you get started with a minimal Crystal application on CircleCI.


If you’re in a rush, just copy the sample configuration below into a .circleci/config.yml in your project’s root directory and start building.

You can view an example Crystal project at the following link:

In the project you will find a commented CircleCI configuration file .circleci/config.yml.

The application uses Crystal 0.26 and Kemal 0.24. Both Crystal and Kemal are developing quickly. Altering the Docker image to the :latest version may cause breaking changes.

Sample Configuration

version: 2 # use CircleCI 2.0
jobs: # a collection of jobs
    working_directory: ~/demo_app
    docker: # run build steps with docker
      - image: crystallang/crystal:0.26.0 # primary docker container; all `steps` will run here.
    steps: # a collection of executable steps
      - checkout # checks out source code to working directory
      - restore_cache: # Restore dependency cache
          key: dependency-cache-{{ checksum "shard.lock" }}
      - run:
          name: Install dependencies.
          command: shards install
      - save_cache: # Step to save dependency cache
          key: dependency-cache-{{ checksum "shard.lock" }}
            - ./lib
      - run:
          name: test
          command: crystal spec
# See for deploy examples    

Great! You’ve set up CircleCI 2.0 for a basic Crystal application.


See the Deploy document for example deploy target configurations.