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Rebase Container ​

Crane tool has rebase command to rebase a container image to a new base image. This is useful when the base image is updated and you want to update the container image to use the new base image.

https://github.com/google/go-containerregistry/tree/main/cmd/crane

sh
VERSION=v0.19.0
OS=Linux
ARCH=x86_64

curl -fSL https://github.com/google/go-containerregistry/releases/download/${VERSION}/go-containerregistry_${OS}_${ARCH}.tar.gz | tar -oxz -C ~/bin/ crane

Example ​

Old dockerfile

dockerfile
FROM alpine:3.18.6

COPY test test

First build the container image

sh
docker build -t rytsh/test:3.18.6 .
docker push rytsh/test:3.18.6

Rebase the container image to use alpine:3.19.1 as the base image

sh
# first login with crane
crane auth login docker.io -u rytsh -p <password>
crane rebase --old_base alpine:3.18.6 --new_base alpine:3.19.1 -t rytsh/test:3.19.1 rytsh/test:3.18.6