Speed up ECS deploys: 30s drain + 10s health checks#44
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…terval - Reduce deregistration_delay from 300s (AWS default) to 30s - Reduce health check interval from 30s to 10s - Reduce unhealthy_threshold from 3 to 2 - Wire deregistration_delay through registry (app.yaml: routing.deregistration_delay) Deploy time drops from ~6 min to ~1 min: 20s health check + 30s drain.
Terraform PlanNo changes — infrastructure is up to date. Plan output |
The deploy script was reading the task definition from the running service, which missed structural changes from Terraform (like readonlyRootFilesystem). Now uses the latest family revision which includes Terraform's changes before swapping the image tag.
Terraform PlanNo changes — infrastructure is up to date. Plan output |
Alexanderamiri
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May 9, 2026
## Summary - Reduce ALB target group `deregistration_delay` from **300s** (AWS default) to **30s** - Reduce health check `interval` from 30s to **10s** and `unhealthy_threshold` from 3 to **2** - Wire `deregistration_delay` through registry for app.yaml override (`routing.deregistration_delay`) Deploy stabilization drops from ~6 min to ~1 min (20s health check + 30s drain). ## Test plan - [ ] Merge to main - [ ] Push trigger to platform-test-app - [ ] Verify `ecs-deploy` step completes in ~1-2 min instead of ~3-6 min - [ ] Verify target group has `deregistration_delay = 30`
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Summary
deregistration_delayfrom 300s (AWS default) to 30sintervalfrom 30s to 10s andunhealthy_thresholdfrom 3 to 2deregistration_delaythrough registry for app.yaml override (routing.deregistration_delay)Deploy stabilization drops from ~6 min to ~1 min (20s health check + 30s drain).
Test plan
ecs-deploystep completes in ~1-2 min instead of ~3-6 minderegistration_delay = 30