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# Auto DevOps development guide
This document provides a development guide for contributors to
[Auto DevOps](../topics/autodevops/index.md)
## Development
Auto DevOps builds on top of GitLab CI to create an automatic pipeline
based on your project contents. When Auto DevOps is enabled for a
project, the user does not need to explicitly include any pipeline configuration
through a [`.gitlab-ci.yml` file](../ci/yaml/README.md).
In the absence of a `.gitlab-ci.yml` file, the [Auto DevOps CI
template](https://gitlab.com/gitlab-org/gitlab/blob/master/lib/gitlab/ci/templates/Auto-DevOps.gitlab-ci.yml)
is used implicitly to configure the pipeline for the project. This
template is a top-level template that includes other sub-templates,
which then defines jobs.
Some jobs use images that are built from external projects:
- [Auto Build](../topics/autodevops/index.md#auto-build) uses
[configuration](https://gitlab.com/gitlab-org/gitlab/blob/master/lib/gitlab/ci/templates/Jobs/Build.gitlab-ci.yml)
in which the `build` job uses an image that is built using the
[`auto-build-image`](https://gitlab.com/gitlab-org/cluster-integration/auto-build-image)
project.
- [Auto Deploy](../topics/autodevops/index.md#auto-deploy) uses
[configuration](https://gitlab.com/gitlab-org/gitlab/blob/master/lib/gitlab/ci/templates/Jobs/Deploy.gitlab-ci.yml)
in which the jobs defined in this template use an image that is built using the
[`auto-deploy-image`](https://gitlab.com/gitlab-org/cluster-integration/auto-deploy-image)
project. By default, the Helm chart defined in
[`auto-deploy-app`](https://gitlab.com/gitlab-org/charts/auto-deploy-app)
is used to deploy.
There are extra variables that get passed to the CI jobs when Auto
DevOps is enabled that are not present in a normal CI job. These can be
found in
[`ProjectAutoDevops`](https://gitlab.com/gitlab-org/gitlab/blob/bf69484afa94e091c3e1383945f60dbe4e8681af/app/models/project_auto_devops.rb).
## Development environment
Configuring [GDK for Auto
DevOps](https://gitlab.com/gitlab-org/gitlab-development-kit/blob/master/doc/howto/auto_devops.md).
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