Used to make sure docker buildx can be used on Linux Docker Digital Ocean Droplets built late 2021, with the goal of creating images which run natively on the Apple M1 chip.
A very big thanks to Artur Klauser whose article Building Multi-Architecture Docker Images With Buildx, Artur Klauser, Medium, Jan 18, 2020 this project was based upon.
Start by making sure you have an account on the Docker Hub, creating a DigitalOcean Docker droplet and logging in. Here are examples if your Docker Hub User is my_docker_hub_user and your password is princess.
DOCKERHUBUSER=my_docker_hub_user
DOCKERHUBPASS=princess
export DOCKER_CLI_EXPERIMENTAL=enabled
./scripts/run.sh
docker buildx create --name mybuilder
docker buildx use mybuilder
docker buildx inspect --bootstrap
docker login -u"$DOCKERHUBUSER" -p"$DOCKERHUBPASS"
docker buildx build -t "$DOCKERHUBUSER"/buildx-test:1 --platform linux/amd64,linux/arm64/v8 --push .
This one is truly ugly. At the time of this writing, it happens when I try to install git on the PHP:7.4 image on the ARM architecture, running QEMU emulation on a Ubuntu machine with the above script.
I used a technique documented in the forum post libc-bin error during upgrade, by sixdigit, Aug 21, 2020, Linux Mint Forums to get around this, but this causes further issues so I do not recommend it: You can see a working example here.
Complete steps to reproduce can be found at docker-library/drupal#206.
In this project's example folder you will find a complete project which you can run directly on a new DigitalOcean Docker droplet. Once you create the droplet and log in, the following should work:
cd ~
git clone https://github.com/dcycle/prepare-docker-buildx.git
cd prepare-docker-buildx/example
export DOCKERHUBUSER=my_docker_hub_user
export DOCKERHUBPASS=princess
./build.sh
This feature is experimental and under development; it is not ready for use.
This script relies on Qemu.
By default we install Qemu using the package manager, which is relatively fast, but which installs an earlier version of Qemu which can cause some errors such as this one.
If you would like the latest version of Qemu, you can run, instead of ./scripts/run.sh,
export INSTALL_QEMU_MAKE=1 && ./scripts/run.sh
This installs the latest version of Qemu, but can take an extremely long time to install, around one to two hours.
Although M1 can run Intel images in emulation, you will get way better performance by creating native images. See Docker PHP on the M1 chip, example with Static Analysis on Drupal: 9 times faster, Dcycle Blog, November 17, 2021.