AWS DevOps Engineer Professional
942 incident response problems that help with AWS DevOps Engineer Professional prep.
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All problems (942)
CICD-270A provenance gate compares Git tags while the published release is built from a detached worktree tarball during a failover rehearsalSource control identity and published artifact identity diverge even though both look plausible in isolation. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.CI/CDAdvanced18 minProCICD-234A release candidate passes smoke tests in one region while traffic warmup happens against another region during a failover rehearsalValidation says the build is safe, but the workload that receives real traffic is not the one the tests exercised. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.CI/CDIntermediate18 minProCICD-477A reusable workflow signs container images correctlyA reusable workflow signs container images correctly focuses on ci-cd-release-safety and asks the reader to isolate Permission Denied in GitHub. 실무에서는 ci-cd-release-safety 문제를 볼 때 실패 단계만 보지 말고 최근 변경, 이미지 태그, 시크릿 주입, 롤백 가능 여부를 먼저 함께 확인하는 편이 빠릅니다.CI/CDIntermediate18 minProCICD-1279A self-hosted runner appears healthy in the UI but jobs fail sporadicallyA self-hosted runner becomes flaky over time even though no single workflow change explains the instability.CI/CDAdvanced18 minProCICD-1253A self-hosted runner handles checkout and tests but deploy hangsA hardening change or mount migration leaves the self-hosted runner able to run early steps but stuck when later stages need a writable temp workspace.CI/CDAdvanced18 minProCICD-1283A self-hosted runner passes health checks but builds fail near the endA self-hosted container build lane grows flakier over several days while the runner still shows healthy in the Actions UI.CI/CDAdvanced18 minProCICD-1240A self-hosted runner starts jobs normally but one workflow hangs foreverSelf-hosted jobs begin hanging after a hardening change even though the runner still appears online and idle/active transitions look normal.CI/CDAdvanced18 minProCICD-1256A self-hosted workflow reaches checkout but the next run fails cleaning the workspaceA self-hosted runner has been stable for weeks until one Docker-based build starts poisoning later checkouts with permission errors.CI/CDAdvanced18 minProCICD-147A Terraform destroy plan targets the right workspace, but the provider alias resolution shifted and the plan now points at the shared services accountReviewers looked at the expected stack, yet runtime provider wiring changed the real blast radius.CI/CDAdvanced18 minProCICD-128A Terraform plan file is generated with one provider plugin version and applied later with another, producing an unexpected drift errorThe change was reviewed correctly, but the saved plan no longer matches the provider behavior available at apply time.CI/CDAdvanced18 minProCICD-1231A workflow deploys successfully but rollback cannot find the buildA team tries to promote and later roll back one release, but the rollback pipeline cannot identify which immutable artifact the release should point to.CI/CDAdvanced18 minProCICD-312An IaC validation stage ignores tag-only drift while a compliance controller uses those tags to permit or deny later runtime changes during a failover rehearsalThe infrastructure shape matches expectations, yet its governance behavior does not. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.CI/CDAdvanced18 minProCICD-240An integrity gate trusts an object-store ETag after transparent recompression changed the real payload identity during a failover rehearsalThe object is present and the hash-like signal no longer represents the original binary content. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.CI/CDAdvanced18 minProCICD-1220Branch protection waits foreverA matrix refactor adds conditions and later one protected status name never resolves again on pull requests.CI/CDAdvanced18 minProCICD-1216Cache restore looks healthy but one job still tests the wrong dependency treeA validation branch appears flaky because it keeps reusing a broad cache from another state.CI/CDAdvanced18 minProCICD-112Cache warming publishes a stale base image to the internal mirror and every subsequent build inherits the vulnerable layerThe dependency warmup stage succeeds, yet later builds are compromised by a mirrored base image that bypassed the freshness policy.CI/CDAdvanced18 minProCICD-100Canary traffic shifts correctly but a legacy cron node keeps running the old job image out of bandThe service path looks promoted, but background jobs still operate on the old release because the scheduler pool was not included in the rollout boundary.CI/CDAdvanced18 minProCICD-122Cosign verification succeeds on the public digest, but deployment pulls from a private mirror that serves a different manifestSupply chain checks pass during build, yet the runtime artifact is not the one that was signed because the mirror rewrites the digest target.CI/CDAdvanced18 minProCICD-1235Environment approval is granted but deployment still stallsAn organization introduces approval gates with reusable workflows and later one deployment remains pending even though the approval shows as completed.CI/CDAdvanced18 minProCICD-1223Matrix cleanup job deletes a needed cacheA multi-shard workflow uses a cleanup step to remove temp caches and occasionally deletes assets still needed by slower shards.CI/CDAdvanced18 minPro