Using Docker Runner

Creating and Using GitLab Runners and Executors

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Repeat the same procedure to create a Docker runner. The only difference is that you need to choose "Docker" as the platform when creating the runner. Use the following tag: docker.

Install Docker:

curl -fsSL https://get.docker.com -o get-docker.sh
bash get-docker.sh

Start the Docker service:

systemctl start docker

Check the status of the Docker service:

systemctl status docker

Launch the GitLab runner container:

docker run -d --name gitlab-runner --restart always \
-v /srv/gitlab-runner/config:/etc/gitlab-runner \
-v /var/run/docker.sock:/var/run/docker.sock \
gitlab/gitlab-runner:latest

Now to use the Docker runner with a specific image based on your needs. In our case the image is python:3.12. The token should be exported as an environment variable as we did before. Finally, you need to run the following command.

gitlab-runner register \
--url https://gitlab.com/ \
--registration-token $GITLAB_RUNNER_TOKEN \
--executor docker \
--description "My Docker Runner" \
--docker-image "python:3.12" \
--non-interactive

Update the ".gitlab-ci.yml" file to use the Docker runner. Here is the updated ".gitlab-ci.yml" file:

cat < $HOME/todo/app/.gitlab-ci.yml && \
cd $HOME/todo/app && \
git add . && \
git commit -m "Add a GitLab CI/CD pipeline" && \
git push origin main
# Define the stages of the pipeline.
stages:
  - build
  - test

# Define the build stage
build:
  stage: build

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