Actions Runner Controller (ARC) is a Kubernetes operator that orchestrates and scales self-hosted runners for GitHub Actions. With ARC, you can create runner scale sets that automatically scale based on the number of workflows running in your repository, organization, or enterprise.
This video is a deep dive into the different components of ARC, the design decisions, the helm chart configurations and everything you need to know to successfully use it.
▬▬▬▬▬▬ Resources & References 📕 ▬▬▬▬▬▬
- ARC documentation: https://gh.io/arc-docs
- ARC repository: https://github.com/actions/actions-runner-controller
▬▬▬▬▬▬ Chapters 🕐 ▬▬▬▬▬▬
00:00:00 - Intro 00:01:01 - Brief history 00:01:55 - Docs walkthrough & design decisions 00:08:10 - Architecture overview 00:09:54 - What are runner scale sets? 00:15:20 - Controller manager & listener 00:24:33 - The ARC repository structure 00:25:19 - GitHub support vs community support 00:27:51 - Legacy runner images 00:31:58 - ARC releases (artifacts & packages) 00:33:17 - The helm charts packages 00:35:05 - Why 2 helm charts? 00:36:46 - Legacy ARC packages 00:39:54 - ARC pre-requisites setup 00:48:29 - Controller-manager configuration options 01:02:54 - Installing the controller-manager 01:07:37 - Installing a runner scale set 01:08:36 - Link to GitHub Actions App setup 01:10:14 - Creating a GitHub App Kubernetes secret 01:12:57 - HTTP proxy configuration 01:16:18 - Min-max boundaries 01:18:40 - Runner scale set name override 01:19:58 - Custom CA self-signed certificates 01:29:04 - Understanding containerMode 01:33:45 - Configuring Docker in Docker (DinD) container mode 01:36:57 - Installing a runner scale set (DinD mode) 01:43:31 - Docker in Docker (Dind) simple workflow demo 01:46:47 - DinD with service container demo 01:50:08 - Kubernetes container mode 01:58:00 - Troubleshooting a failed installation 01:59:59 - Kubernetes mode demo with service container
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