GitLab CI/CD is a powerful tool integrated within GitLab that automates the software development lifecycle. It allows developers to build, test, and deploy their code efficiently. By defining a .gitlab-ci.yml file, teams can specify the stages, jobs, and scripts to be executed in their CI/CD pipeline.
One common issue encountered in GitLab CI is the 'Docker Image Not Found' error. This error typically manifests when a job in the pipeline attempts to pull a Docker image that is either incorrectly specified or unavailable. The error message might look something like this:
ERROR: Job failed: image pull failed: manifest for registry.example.com/my-image:latest not found
The 'Docker Image Not Found' error occurs when the specified Docker image cannot be located in the registry. This can happen due to a typo in the image name, an incorrect tag, or the image not being pushed to the registry.
.gitlab-ci.yml file.Ensure that the Docker image name and tag specified in your .gitlab-ci.yml file are correct. Double-check for typos or incorrect tags. For example:
image: registry.example.com/my-image:latest
Make sure that 'my-image' and 'latest' are correct and exist in the registry.
Log in to your Docker registry and verify that the image exists. You can use the Docker CLI to list images:
docker images
If the image is missing, ensure it is built and pushed to the registry:
docker build -t registry.example.com/my-image:latest .
docker push registry.example.com/my-image:latest
Ensure that your GitLab CI runner has the necessary permissions to access the Docker registry. This may involve setting up authentication credentials in your GitLab CI/CD settings. Refer to the GitLab documentation for more details on configuring registry access.
By carefully verifying the Docker image name, ensuring the image is available in the registry, and checking access permissions, you can resolve the 'Docker Image Not Found' error in GitLab CI. For further reading, consult the GitLab CI Docker documentation.
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