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84 lines
3 KiB
Markdown
84 lines
3 KiB
Markdown
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---
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title: "Docker Images"
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slug: "docker-images"
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hidden: false
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createdAt: "2023-12-07T10:00:00.000Z"
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updatedAt: "2023-12-07T10:00:00.000Z"
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---
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# Setting up Docker's Buildx
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Docker Buildx is an extension of Docker's build command, that provides a more efficient way to create images. It is part of Docker 19.03 and can also be manually installed as a CLI plugin for older versions.
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1. Enable Docker CLI experimental features
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Docker CLI experimental features are required to use Buildx. Enable them by setting the DOCKER_CLI_EXPERIMENTAL environment variable to enabled.
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You can do this by adding the following line to your shell profile file (.bashrc, .zshrc, etc.):
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```
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export DOCKER_CLI_EXPERIMENTAL=enabled
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```
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After adding it, source your shell profile file or restart your shell to apply the changes.
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2. Create a new builder instance
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By default, Docker uses the "legacy" builder. You need to create a new builder instance that uses BuildKit. To create a new builder instance, use the following command:
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```
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docker buildx create --use
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```
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The --use flag sets the newly created builder as the current one.
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# Setting up multiarch/qemu-user-static
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1. Check Buildx is working
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Use the `docker buildx inspect --bootstrap` command to verify that Buildx is working correctly. The `--bootstrap` option ensures the builder instance is running before inspecting it. The output should look something like this:
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```
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Name: my_builder
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Driver: docker-container
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Last Activity: 2023-06-13 04:37:30 +0000 UTC
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Nodes:
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Name: my_builder0
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Endpoint: unix:///var/run/docker.sock
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Status: running
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Buildkit: v0.11.6
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Platforms: linux/amd64, linux/amd64/v2, linux/amd64/v3, linux/amd64/v4, linux/386
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```
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2. Install `binfmt-support` and `qemu-user-static` if not installed already.
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```shell
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sudo apt-get update
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sudo apt-get install docker.io binfmt-support qemu-user-static
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sudo systemctl restart docker
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```
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3. Setup QEMU to run binaries from multiple architectures
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```
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docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
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```
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4. Confirm QEMU is working
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Again run `docker buildx inspect --bootstrap` command to verify that `linux/arm64` is in the list of platforms.
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```
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Name: my_builder
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Driver: docker-container
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Last Activity: 2023-06-13 04:37:30 +0000 UTC
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Nodes:
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Name: my_builder0
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Endpoint: unix:///var/run/docker.sock
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Status: running
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Buildkit: v0.11.6
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Platforms: linux/amd64, linux/amd64/v2, linux/amd64/v3, linux/amd64/v4, linux/386, linux/arm64, linux/riscv64, linux/ppc64, linux/ppc64le, linux/s390x, linux/mips64le, linux/mips64
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```
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# Building/publishing images on Dockerhub
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1. Ensure that your multiarch setup is working
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2. Run script `tools/build-release.sh --push docker` to build `amd64`, `arm64v8`, `latest` and `multiarch` images and publish them on Dockerhub.
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3. If you do not want to push the images directly on Dockerhub then run `tools/build-release.sh docker`. It will only create images locally but not push them to Dockerhub.
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