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PASSEDcache / fd_exhaustion
Varnish 7.5 File Descriptor Limit Reached on Ubuntu 22.04 LTS
Varnish 7.5 has exhausted its file descriptor limit. Cannot accept new connections or open new files. Service functionality severely degraded.
Pattern
CONNECTION_REFUSED
Severity
CRITICAL
Confidence
68%
Remediation
Auto-Heal
Test Results
| Metric | Expected | Actual | Result |
|---|---|---|---|
| Pattern Recognition | CONNECTION_REFUSED | CONNECTION_REFUSED | |
| Severity Assessment | HIGH | CRITICAL | |
| Incident Correlation | N/A | None | |
| Cascade Escalation | N/A | No | |
| Remediation | — | Auto-Heal — Corax resolves autonomously |
Scenario Conditions
Ubuntu 22.04 LTS. Varnish 7.5 at 59702/59711 file descriptors. Connection leak detected. ulimit -n set to 59711 (default, not tuned for production).
Injected Error Messages (1)
Varnish 7.5 on Ubuntu 22.04 LTS — 59702/59711 FDs used, 'Too many open files', connection refused on new requests, varnishd leaking file descriptors at 91/min
Neural Engine Root Cause Analysis
Connection refused — service is likely crashed or not listening on the expected port.
Remediation Plan
Restart the target service. If recurring, check for memory leaks or crash loops.
Improvements Applied
- Severity: CRITICAL (expected HIGH)
Tested: 2026-04-02Monitors: 1 | Incidents: 1Test ID: cmnhnpzzh04r2lig78spjvzxd