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I'm trying to achieve re tagging of docker images via docker command.

Basically I need to do the below steps to achieve my goal:

1)Pull an existing multi architecture image from private registry.

2)Tag it with new name (e.g: tag imagename-test to imagename-final)

3)And push the newly tagged image back to private registry again.

So I have tried the below command:

docker buildx build --tag {registry name/repository}/imagename-test --tag {registry name/repository}/imagename-final \
-- pull -- platform=linux/amd64,linux/arm64 \
-- push .

Here the image is getting pushed with both tags.But I need to tag imagename-test to imagename-final and only need to push imagename-final to the registry.

Usually we do,

docker pull imagename-test
docker tag imagename-test imagename-final
docker push imagename-final

Any suggestions to achieve this by using only docker buildx commands for multi architecture images?

bluebud
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2 Answers2

5

You can use docker buildx imagetools to re-tag an image index, i.e:

docker buildx imagetools create -t imagename-final imagename-test

More info about imagetools create here

jenarros
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1

In addition to docker buildx imagetools create, there are multiple tools that would do this without needing to pull the image or risk changing the digest on the image. Google has crane, RedHat has skopeo, and I have regclient.

crane copy $src $dest

skopeo copy docker://$src docker://$dest

regctl image copy $src $dest

With each of those, the tooling only needs to pull the top level manifest, which is typically a couple kb of JSON data, and none of the layers, making it much faster than a docker pull. (You can often download these tools faster than you can pull an image.)

BMitch
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