# Image registries Image registries can be configured through a set of key/value configuration options. See [Configure an image registry](https://canonical.com/lxd/docs/latest/howto/image_registries/index.html.md#howto-image-registries-configure) for instructions on how to set these options. The following options are available: `cluster` Cluster link name for image registry using “LXD” protocol [](#image-registry-image-registry-conf:cluster) | **Key:** | `cluster` | |---------------|-------------| | **Type:** | string | | **Required:** | no | `source_project` Source project for image registry using “LXD” protocol [](#image-registry-image-registry-conf:source_project) | **Key:** | `source_project` | |---------------|--------------------| | **Type:** | string | | **Required:** | no | `url` Source URL for image registry using “SimpleStreams” protocol [](#image-registry-image-registry-conf:url) | **Key:** | `url` | |---------------|---------| | **Type:** | string | | **Required:** | no | `user.*` User-provided free-form key/value pairs [](#image-registry-image-registry-conf:user.*) | **Key:** | `user.*` | |-------------|------------| | **Type:** | string | ## Related topics How-to guides: - [Images](https://canonical.com/lxd/docs/latest/images/index.html.md#images) Explanation: - [Local and remote images](https://canonical.com/lxd/docs/latest/image-handling/index.html.md#about-images)