debian-mirror-gitlab/doc/ci/examples/test-and-deploy-ruby-application-to-heroku.md

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---
type: tutorial
---
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# Test and deploy a Ruby application with GitLab CI/CD
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This example will guide you through how to run tests in your Ruby on Rails application and deploy it automatically as a Heroku application.
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You can also view or fork the complete [example source](https://gitlab.com/ayufan/ruby-getting-started) and view the logs of its past [CI jobs](https://gitlab.com/ayufan/ruby-getting-started/-/jobs?scope=finished).
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## Configure the project
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This is what the `.gitlab-ci.yml` file looks like for this project:
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```yaml
test:
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stage: test
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script:
- apt-get update -qy
- apt-get install -y nodejs
- bundle install --path /cache
- bundle exec rake db:create RAILS_ENV=test
- bundle exec rake test
staging:
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stage: deploy
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script:
- gem install dpl
- dpl --provider=heroku --app=gitlab-ci-ruby-test-staging --api-key=$HEROKU_STAGING_API_KEY
only:
- master
production:
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stage: deploy
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script:
- gem install dpl
- dpl --provider=heroku --app=gitlab-ci-ruby-test-prod --api-key=$HEROKU_PRODUCTION_API_KEY
only:
- tags
```
This project has three jobs:
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- `test` - used to test Rails application.
- `staging` - used to automatically deploy staging environment every push to `master` branch.
- `production` - used to automatically deploy production environment for every created tag.
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## Store API keys
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You'll need to create two variables in your project's **Settings > CI/CD > Environment variables**:
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- `HEROKU_STAGING_API_KEY` - Heroku API key used to deploy staging app.
- `HEROKU_PRODUCTION_API_KEY` - Heroku API key used to deploy production app.
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Find your Heroku API key in [Manage Account](https://dashboard.heroku.com/account).
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## Create Heroku application
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For each of your environments, you'll need to create a new Heroku application.
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You can do this through the [Heroku Dashboard](https://dashboard.heroku.com/).
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## Create Runner
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First install [Docker Engine](https://docs.docker.com/installation/).
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To build this project you also need to have [GitLab Runner](https://docs.gitlab.com/runner/).
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You can use public runners available on `gitlab.com` or register your own. Start by
creating a template configuration file in order to pass complex configuration:
```shell
cat > /tmp/test-config.template.toml << EOF
[[runners]]
[runners.docker]
[[runners.docker.services]]
name = "postgres:latest"
EOF
```
Finally, register the runner, passing the newly-created template configuration file:
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```shell
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gitlab-runner register \
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--non-interactive \
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--url "https://gitlab.com/" \
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--registration-token "PROJECT_REGISTRATION_TOKEN" \
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--description "ruby:2.6" \
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--executor "docker" \
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--template-config /tmp/test-config.template.toml \
--docker-image ruby:2.6
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```
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With the command above, you create a Runner that uses the [`ruby:2.6`](https://hub.docker.com/_/ruby) image and uses a [PostgreSQL](https://hub.docker.com/_/postgres) database.
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To access the PostgreSQL database, connect to `host: postgres` as user `postgres` with no password.