If you’re going to build custom images for ARC or standalone VM runners, then you probably want to take some time to preload it with the tools that matter to your builds. If you want that process to work well for the GitHub-provided tools and actions/setup- Actions, then you’ll want to know how to prepopulate the runner’s tool cache.

Understanding ARC begins with understanding what it does (and does not do) to create runners on Kubernetes. The process is surprisingly straight-forward, and understanding it is key to mastering ARC.

The world of dev containers is constantly changing. Sometimes, even with community-driven specifications, there is a bit of room for interpretation. The initializeCommand lifecycle script is a great example of this, and the specification has been updated to align with the implementations. Learn how this affects your dev containers (and why your scripts should always be idempotent).

Sometimes you just need a little human interaction. And sometimes you need that to happen when you’re starting up a dev container so you can configure the environment. Thankfully, there is a way to get user input that works with most of the dev container implementations.

Part of mastering Kubernetes or containers is understanding how they work and how they interact with the host system. You’ve probably seen how to mount drives or folders into a containerized system, but there is another approach – mounting a file like a drive. This post will explore how to do this using a loop device in Linux.