Harden ECS task definition for Security Hub compliance#43
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- Add readonlyRootFilesystem=true to container definition (ECS.5 HIGH) - Add ephemeral /tmp volume mount so containers can still write temp files - Add non-root user default "1000" with tostring() for JSON encoding (ECS.20) - Wire container_user through registry for app.yaml override via compute.user
Terraform PlanNo changes — infrastructure is up to date. Plan output |
Alexanderamiri
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May 9, 2026
## Summary - **ECS.5 (HIGH)**: Add `readonlyRootFilesystem = true` to container definition + ephemeral `/tmp` volume mount so apps can still write temp files - **ECS.20 (MEDIUM)**: Add `user = "1000"` default (non-root) — apps can override via `compute.user` in app.yaml - Wire `container_user` through the module registry for expander support Triggered by Security Hub alerts on `platform-test-app:6` and `:7`. ## Test plan - [ ] Merge to main - [ ] Push trigger commit to platform-test-app — expand will regenerate service.tf with hardened defaults - [ ] Verify new task definition revision has `readonlyRootFilesystem: true`, `/tmp` mount, and `user: "1000"` - [ ] Verify Security Hub finding resolves within ~24h
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Summary
readonlyRootFilesystem = trueto container definition + ephemeral/tmpvolume mount so apps can still write temp filesuser = "1000"default (non-root) — apps can override viacompute.userin app.yamlcontainer_userthrough the module registry for expander supportTriggered by Security Hub alerts on
platform-test-app:6and:7.Test plan
readonlyRootFilesystem: true,/tmpmount, anduser: "1000"