> For the complete documentation index, see [llms.txt](https://docs.duplocloud.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.duplocloud.com/docs/automation-platform/introduction-to-ci-cd/katkit/advanced-functions.md).

# Advanced functions

## Bring your own image <a href="#id-0-toc-title" id="id-0-toc-title"></a>

By default, all tenant CI/CD runs are executed in a docker image specified by the administrator. This image would typically have the most common packages for your organization. But a user can bring his own builder image and specify the same. The image should have the Katkit agent that can be copied from the default builder image.

## Bring your own fleet or local fleet <a href="#id-1-toc-title" id="id-1-toc-title"></a>

By default, Katkit will run the builder containers in a separate set of hosts, but the user can also choose to run the build container in the same tenant hosts which is being tested.


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