init: 클린 아키텍처 백엔드

2026-07-24 14:29:36 +09:00
parent 9eed16d097
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+---
+title: Runbook — DEPENDENCY_DNS_FAILED (DNS 조회 실패)
+category: TRANSIENT_DEPENDENCY
+error_codes: [DEPENDENCY_DNS_FAILED]
+severity: P1
+owner: oncall
+last_updated: 2026-06-15
+status: stub
+---
+
+# Runbook: DEPENDENCY_DNS_FAILED (`runbook://dependency/dns-failed`)
+
+## Symptoms
+
+- HTTP 503 with `error.code=DEPENDENCY_DNS_FAILED`
+- DNS resolution failure for upstream hostname
+
+## Diagnosis
+
+- Test DNS resolution from app pod: `nslookup <upstream-host>`
+- Check cluster DNS (CoreDNS) health
+
+## Action
+
+- Verify upstream hostname configuration
+- Check CoreDNS / cluster DNS health
+
+## Escalation
+
+- P1 if cluster DNS is degraded
+
+---
+
+> **Stub**: Phase D2 — author body after domain adoption. (feature-operational-runbook-contract D9)