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This creates a buildx container to do the work for you. These are the commands I used to build my vagrant provider Docker image for both amd64 and arm64 architecture.įirst you must prepare a buildx builder to use: $ export DOCKER_BUILDKIT=1 $ docker buildx create -use -name=qemu $ docker buildx inspect -bootstrap #VIRTUALBOX M1 APPLE MAC#I was even able to build a Docker image on my Intel Mac that would run on both Intel and an Apple Silicon Mac by using an experimental Docker feature called buildx. ![]() It was surprisingly easier than I thought. The last hurtle was to build a Docker image that would run on both Intel and ARM based computers so that my students and development teams could use it on either platform. ![]() Building a Multi-Architecture Docker Image You can use this image as a vagrant provider to start your own Ubuntu Docker containers that behave like virtual machines for doing development work, compete with an init system. With his guidance, I was able to build an Ubuntu 20.04 Docker image that was tailored for my purposes. Easier said than done.ĭocker makes it very hard to use systemd inside a container but lucky fo me, Matthew Warman had already figured this part out for CentOS and was extremely helpful in getting this to work for me with Ubuntu. Since I was using Ubuntu, I need to get systemd (Ubuntu’s init system) running as the first process (PID 1) in order to get the containers to truly act like a virtual machine. #VIRTUALBOX M1 APPLE INSTALL#Docker containers don’t normally run a linux init system like a virtual machines does because containers are intended to only run one process, but many of the tools I needed to install expected an init system. There was also another problem to overcome. To do so would make them mutable and less secure. Normally, you should not do this when using containers for their intended purpose of providing immutable runtimes. Coercing a Container to behave like a VMĮveryone will tell you to never install an ssh daemon ( sshd) inside of a Docker container. That means I had to get ssh to work with my container because that is how vagrant expects to establish a shell inside of the VM. #VIRTUALBOX M1 APPLE WINDOWS#The difference here is that normally you would use the docker exec command to establish a shell inside the container but I needed these containers to behave exactly like a virtual machine (VM) because I didn’t want students or developers with Apple M1 Macs to have a different experience than those on an Intel Mac or Windows computer. I plan to cover that in a future article. In fact, if you use Visual Studio Code, there is an extension called Remote Containers that allows you to develop in containers. The concept of using Docker as a development environment is not new. As with all technology, there are always use cases beyond the original intent and I was about to learn if this use case was viable. ![]() This is somewhat of a unique use case for Docker because the intent of Docker is to provide a consistent, immutable runtime environment not to be treated like a virtual machine. This means that Vagrant can control the provisioning of Docker containers just like it controls VirtualBox for provisioning virtual machines. I also remembered that Vagrant supports Docker as a provider. #VIRTUALBOX M1 APPLE FOR MAC#I had heard that Docker had released a tech preview of Docker Desktop for Mac that runs on Apple Silicon. I need another solution and I needed it fast. As it turns out, 8 of my students showed up for the 2021 spring semester with Apple M1 Macs which meant that all of my labs based on VirtualBox were not going to work for them. #VIRTUALBOX M1 APPLE FREE#I had selected VirtualBox because it was free and supports Mac, Linux, and Windows, but it only runs on Intel computers (x86_64 architecture) and Apple Silicon is ARM base (aarch64 architecture). That worked really well until Apple released their new 2020 Macs with Apple M1 Silicon chips based on the ARM architecture. In my article Creating Repeatable Development Environments, I showed how I use Vagrant as an orchestrator and VirtualBox as a provider of virtual machines for creating consistent development environments for my students and development teams. ![]()
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