[PDLC] Multiarch Images

Description

There are Use-Cases making deployments on machine architectures such us arm64/v8.

I propose to adapt our images to support the following architectures:

• linux/arm/v7
• linux/arm64/v8
• linux/amd64

Proposed Solution

To Update the current Images

1. Install Docker's buildx if you do not have it already installed
2. Create a Folder to use as a temp

mkdir temp_folder
cd temp_folder

3. Create a Dockerfile from the already existing image Change the multiarch-example:original to your own image_name:tag

echo "FROM docker.io/hecodeco/multiarch-example:original" > Dockerfile

4. Recreate your image (below I am giving a new tag as well) - This will take some time.

docker buildx build \
--push \
--platform linux/arm/v7,linux/arm64/v8,linux/amd64 \
--tag docker.io/hecodeco/multiarch-example:buildx-latest \
.

5. Verify the Rebuilt Image

docker buildx imagetools inspect docker.io/hecodeco/multiarch-example:buildx-latest

6. Remove the temp folder

cd ..
rm -rf temp_folder

After the above, you will also be able to see more Digest options in Dockerhub. For example, check the Digest Options of DP on the 2.3.3-multiarch tag.

To keep using Multiarch Images

From now on, we can build (and push our images) using the following command:

docker buildx build \
--push \
--platform linux/amd64,linux/arm/v7,linux/arm64/v8 \
--tag your-username/multiarch-example:buildx-latest .

Some more Assistanse

To update your Docker Builder to have multiarch creation features do the following:

docker buildx create --name mybuilder --use

Refferences

• buildx
• Some more Documentation