Deployment Rescue Pro — Diagnose & Fix DevOps Deployment

Deployment recovery brief — illustrative supplied evidence

Observed: new release precedes reported 502; app log states port 8080; proxy config states upstream port 3000. Hypothesis: upstream port mismatch may explain the gateway failure. Temporal sequence and config evidence do not prove the complete root cause.

First checks: confirm exact environment/release and effective runtime configuration; verify app readiness, bind address and approved proxy-to-service connectivity through read-only diagnostics; compare current state with last known good deployment. Do not infer a firewall or TLS problem without evidence.

Proposed correction: align the authoritative application/service and proxy port configuration after ownership and design are confirmed. Prefer a tested scoped change, with known-good configuration preserved and explicit rollback. No security control needs to be disabled to evaluate this mismatch.

Data/migration gate: determine whether the release changed schema or data before assuming rollback is safe. Missing migration evidence remains an unresolved risk.

Validation: application readiness, upstream response, end-to-end representative request and error-rate recovery in the actual environment. Deployment completion alone is not service-health proof. Record actual command results and timestamps only when executed.

Containment decision: authorized incident owner weighs impact and verified rollback/forward-fix feasibility. Do not repeatedly restart or delete resources blindly.

Prevention: propose configuration contract tests and release health checks after root cause is confirmed.

Execution notes: no commands run, production config edited, traffic changed or recovery verified.