29 lines
1.1 KiB
Markdown
29 lines
1.1 KiB
Markdown
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<!--[metadata]>
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title = "Garbage Collection"
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description = "High level discussion of garabage collection"
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keywords = ["registry, garbage, images, tags, repository, distribution"]
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<![end-metadata]-->
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# What Garbage Collection Does
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Garbage collection is a process that delete blobs to which no manifests refer.
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It runs in two phases. First, in the 'mark' phase, the process scans all the
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manifests in the registry. From these manifests, it constructs a set of content
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address digests. This set is the 'mark set' and denotes the set of blobs to *not*
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delete. Secondly, in the 'sweep' phase, the process scans all the blobs and if
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a blob's content address digest is not in the mark set, the process will delete
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it.
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# How to Run
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You can run garbage collection by running
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docker run --rm registry-image-name garbage-collect /etc/docker/registry/config.yml
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NOTE: You should ensure that the registry itself is in read-only mode or not running at
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all. If you were to upload an image while garbage collection is running, there is the
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risk that the image's layers will be mistakenly deleted, leading to a corrupted image.
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