Best practices working with self-hosted GitHub Action runners at scale on AWS

This article provides best practices for working with self-hosted GitHub Action runners at scale on AWS.

Specifically, the article covers:

• Understanding security responsibilities when integrating GitHub and AWS environments
• Using short-lived AWS credentials via OIDC and IAM roles for least privilege access
• Using ephemeral runners for build isolation and auto-scaling
• Isolating runners using runner groups and separate AWS accounts
• Optimizing runner startup time with EC2 warm pools
• Using optimized AMIs for consistent and faster runner launches
• Reducing costs with Spot instances
• Recording runner metrics and logs in Amazon CloudWatch for observability