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# Advanced functions
## Bring your own image
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
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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