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Add Image Digest doc in userguide/dockerimages

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Fixes #12551

Signed-off-by: Ankush Agarwal <ankushagarwal11@gmail.com>
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Ankush Agarwal 2015-04-21 12:47:09 -07:00
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commit a4676503d9
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docs/sources/userguide/dockerimages.md
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@ -505,6 +505,25 @@ Let's see our new tag using the `docker images` command.
ouruser/sinatra devel 5db5f8471261 11 hours ago 446.7 MB
ouruser/sinatra v2 5db5f8471261 11 hours ago 446.7 MB
## Image Digests
Images that use the v2 or later format have a content-addressable identifier
called a `digest`. As long as the input used to generate the image is
unchanged, the digest value is predictable. To list image digest values, use
the `--digests` flag:
$ docker images --digests | head
REPOSITORY TAG DIGEST IMAGE ID CREATED VIRTUAL SIZE
ouruser/sinatra latest sha256:cbbf2f9a99b47fc460d422812b6a5adff7dfee951d8fa2e4a98caa0382cfbdbf 5db5f8471261 11 hours ago 446.7 MB
When pushing or pulling to a 2.0 registry, the `push` or `pull` command
output includes the image digest. You can `pull` using a digest value.
$ docker pull ouruser/sinatra@cbbf2f9a99b47fc460d422812b6a5adff7dfee951d8fa2e4a98caa0382cfbdbf
You can also reference by digest in `create`, `run`, and `rmi` commands, as well as the
`FROM` image reference in a Dockerfile.
## Push an image to Docker Hub
Once you've built or created a new image you can push it to [Docker