Back to All Scenarios
PASSEDcache / dns_failure
Varnish 7.5 DNS Resolution Failing — Cannot Resolve Dependencies on AlmaLinux 9
Varnish 7.5 cannot resolve DNS names for its dependencies. All outbound connections failing with ENOTFOUND.
Pattern
DNS_FAILURE
Severity
HIGH
Confidence
68%
Remediation
Auto-Heal
Test Results
| Metric | Expected | Actual | Result |
|---|---|---|---|
| Pattern Recognition | DNS_FAILURE | DNS_FAILURE | |
| Severity Assessment | HIGH | HIGH | |
| Incident Correlation | N/A | None | |
| Cascade Escalation | N/A | No | |
| Remediation | — | Auto-Heal — Corax resolves autonomously |
Scenario Conditions
AlmaLinux 9. Varnish 7.5 DNS resolver unreachable or returning SERVFAIL. /etc/resolv.conf pointing to unreachable nameserver. All DNS-dependent operations failing.
Injected Error Messages (1)
Varnish 7.5 on AlmaLinux 9 — ENOTFOUND, dns resolution failed for all dependencies, nameserver unreachable, all outbound connections failing, varnishd cannot resolve hostnames
Neural Engine Root Cause Analysis
DNS resolution failed — domain may be misconfigured or DNS propagation is pending.
Remediation Plan
Verify DNS records are correct. Check domain registrar and nameserver configuration.
Tested: 2026-04-02Monitors: 1 | Incidents: 1Test ID: cmnhnvpm9025clijgj9qd8bir