Incident Library?

Incident Library?

Component ?

CoreDNS CoreDNS · `coredns`

2 cases · 2019 to 2023

Root cause ?Capacity exhaustion 1 Configuration change 1

Contributing factor ?Change during peak hours 1 Unknown limit 1 Monitoring blind spot 1 No caching 1 No configuration tests 1 Retry storm 1 Missed in review 1

Symptom ?DNS resolution failures 1 High error rate 1 Image pull failures 1 Monitoring outage 1 IP address exhaustion 1 Node disk full 1 OOMKilled 1 Pod eviction 1

Cases, by severity

IL-0019 A module upgrade shrank node disks and filled them with images — UK Ministry of Justice, 2023, sev3
Root cause Configuration change
IL-0001 Cluster-wide DNS outage after CoreDNS ran out of memory — Zalando, 2019
Root cause Capacity exhaustion

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