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github-scaling-explicit

What This Demonstrates

GitHub-first explicit scaling on ImpVMRunnerPool using spec.scaling mode controls.

Why It Matters

  • no implicit capacity defaults for GitHub scaling pools
  • explicit hard ceilings and pace controls
  • clear mode selection (webhook, polling, hybrid) in spec.scaling.mode

Manifests

  • impnetwork.yaml: isolated network for runner VMs
  • impvmclass.yaml: compute profile
  • impvmtemplate.yaml: runner VM template
  • impvmrunnerpool.yaml: explicit scaling configuration

Important

Set these scaling fields explicitly:

  • mode
  • minIdle
  • maxConcurrent
  • scaleUpStep
  • cooldownSeconds

GitHub (platform.type=github-actions) is supported for this explicit scaling mode in this first version.

Prerequisites

  • Secret default/gh-runner-token exists
  • Secret default/gh-webhook-secret exists
  • set platform.scope.repo to your repository

Apply

kubectl apply -f examples/github-scaling-explicit/

Verify

kubectl get impvmrunnerpool ci-runner-explicit -n default -o yaml
kubectl get impvms -n default -l imp.dev/runner-pool=ci-runner-explicit

Cleanup

kubectl delete -f examples/github-scaling-explicit/