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----
-title: Online Garbage collection
-description: Save disk space by configuring the garbage collection settings in
-  Docker Trusted Registry
-keywords: registry, online garbage collection, gc, space, disk space
----
-
-> BETA DISCLAIMER
->
-> This is beta content. It is not yet complete and should be considered a work in progress. This content is subject to change without notice.
-
-
-You can configure Docker Trusted Registry to automatically delete unused image
-layers, thus saving you disk space. This process is also known as garbage collection.
-
-## How DTR deletes unused layers
-
-First you configure DTR to run a garbage collection job on a fixed schedule. At
-the scheduled time DTR:
-
-2. Identifies and marks unused image layers.
-3. Deletes the marked image layers.
-
-As of v2.6.0, online garbage collection is no longer in experimental mode. This means that the registry no longer has to be in read-only mode (or offline) during garbage collection. 
-
-## Schedule garbage collection
-
-In your browser, navigate to `https://<dtr-url>` and log in to the DTR web UI with your credentials. Select **System** on the left navigation pane then click
-the **Garbage collection** tab to enable garbage collection.
-
-![](../../images/garbage-collection-0.png){: .with-border}
-
-Select for how long the garbage collection job should run:
-* Until done: Run the job until all unused image layers are deleted.
-* For x minutes: Only run the garbage collection job for a maximum of x minutes
-at a time.
-* Never: Never delete unused image layers.
-
-Once you select for how long to run the garbage collection job, you can
-configure its schedule (in UTC time) using the cron format.
-
-![](../../images/garbage-collection-2.png){: .with-border}
-
-Once everything is configured you can chose to **Save & start** to immediately
-run the garbage collection job, or just **Save** to run the job on the next
-scheduled interval.
-
-## Stop the garbage collection job
-
-Once the garbage collection job starts running, a banner is displayed on the
-web UI explaining that users can't push images. If you're an administrator, you can click the banner to stop the garbage
-collection job.
-
-![](../../images/garbage-collection-3.png){: .with-border}
-
-## Under the hood
-
-Each image stored in DTR is made up of multiple files:
-
-* A list of image layers that represent the image filesystem.
-* A configuration file that contains the architecture of the image and other
-metadata.
-* A manifest file containing the list of all layers and configuration file for
-an image.
-
-All these files are stored in a content-addressable way in which the name of
-the file is the result of hashing the file's content. This means that if two
-image tags have exactly the same content, DTR only stores the image content
-once, even if the tag name is different.
-
-As an example, if `wordpress:4.8` and `wordpress:latest` have the same content,
-they will only be stored once. If you delete one of these tags, the other won't
-be deleted.
-
-This means that when users delete an image tag, DTR can't delete the underlying
-files of that image tag since it's possible that there are other tags that
-also use the same files.
-
-To delete unused image layers, DTR:
-1. Becomes read-only to make sure that no one is able to push an image, thus
-changing the underlying files in the filesystem.
-2. Check all the manifest files and keep a record of the files that are
-referenced.
-3. If a file is never referenced, that means that no image tag uses it, so it
-can be safely deleted.
-
-## Where to go next
-
-- [Deploy DTR caches](deploy-caches/index.md)
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