GitHub Actions Self-Hosted Runners on AWS — Auto-Scaling Fleet

OVERVIEW

GitHub-hosted runners are shared, slow, and expensive at scale. Your builds queue behind other users. Minute limits block releases at month-end. The more your team ships, the higher the bill.

ZSoftly deploys a GitHub Actions self-hosted runner fleet on AWS with auto-scaling, multi-layer caching, and full cost visibility. Builds start in seconds. Costs drop 50% or more.

WHAT WE DELIVER

Runner Infrastructure

• Actions Runner Controller (ARC) on Amazon EKS or EC2-based fleet (your choice)
• Auto-scaling from 0 to 100+ runners based on GitHub Actions queue depth
• EC2 Spot instances for cost optimization (on-demand fallback for critical workflows)
• Multi-architecture: AMD64 and ARM64 (Graviton) runners for cost and performance

Caching

• Docker layer cache via Amazon ECR pull-through cache
• Dependency cache: npm, pip, Maven, Gradle, Go modules via Amazon S3
• Build artifact storage with lifecycle policies and automatic cleanup

Security

• OIDC-based AWS authentication — zero long-lived credentials in GitHub Secrets
• Runners in private VPC subnets with no public IP exposure
• AWS Secrets Manager integration for sensitive pipeline values
• IAM roles scoped per workflow for least-privilege enforcement

Observability

• CloudWatch dashboard: queue depth, runner utilization, build success rate, cost per workflow
• AWS Budgets alert when monthly runner spend crosses threshold
• GitHub Actions usage report showing per-repo and per-workflow cost attribution

ENGAGEMENT TIMELINE

Week 1-2: Discovery and design. We audit your current GitHub Actions usage — which repos, which workflows, what minute consumption. We design the fleet for your specific workload and team size.

Week 3-4: Deployment. Runner fleet live in your AWS account. OIDC authentication configured. Caching layers active. Top 5 highest-cost workflows migrated to self-hosted runners first.

Week 5-6: Optimization and handoff. Cache hit rates measured and tuned. CloudWatch dashboard live. Cost report baseline established. Team trained. Runbook delivered.

RESULTS YOU CAN EXPECT

• Build duration: 40 min → 6 min (caching eliminates redundant dependency installs)
• Monthly cost: $15K → $5K (EC2 Spot vs. GitHub-hosted per-minute pricing)
• Build start latency: 30+ second queue → under 10 seconds
• Minute limits: Eliminated

WHO THIS IS FOR

• Teams running 1,000+ GitHub Actions minutes per month
• Organizations hitting monthly minute limits and delaying releases
• Companies that need builds inside their AWS security boundary
• Teams building Docker images that benefit from layer caching

WHAT IS INCLUDED

Fixed-scope 6-week engagement. Terraform source code for the full runner fleet. Architecture documentation. Operations runbook. 30-day post-deployment support via shared Slack channel.