[{"id":"IL-0102","title":{"en":"CoreDNS pods on a production EKS cluster ran out of memory under a burst of new pods, endpoints and nodes, taking down the Buildkite web UI, APIs and job dispatch","ko":"배포와 워커 오토스케일링 폭주가 겹치자 크기를 고정해 둔 CoreDNS 가 메모리 한도를 넘겨 재시작된 뒤 회복하지 못했고, Buildkite 사이트 전체가 약 30분 멈췄다."},"org":"Buildkite","org_slug":"buildkite","date":"2026-08-25","severity":"unknown","root_cause":"capacity","url":"https://benchlet.com/incidentlib/app/cases/IL-0102","shared_components":["coredns","hpa"]},{"id":"IL-0181","title":{"en":"A traffic spike from an external community post pushed product API pods into CPU throttling under a 1-core limit, and an e-commerce product page slowed down while every pod stayed Running","ko":"외부 커뮤니티 게시글로 트래픽이 몰려 상품 API 파드가 CPU limit 1코어에서 스로틀링되면서 상품 조회 페이지가 매우 느려졌다"},"org":"Kevin","org_slug":"kevin","date":"2026-02-19","severity":"unknown","root_cause":"capacity","url":"https://benchlet.com/incidentlib/app/cases/IL-0181","shared_components":["hpa","cpu-limit"]},{"id":"IL-0048","title":{"en":"DNS lookups timed out in a large EKS cluster when CoreDNS hit the 1024 packets-per-second link-local limit, driven by sudo hostname lookups","ko":"대형 EKS 클러스터에서 CoreDNS 가 VPC DNS 리졸버로 보내는 질의가 링크 로컬 트래픽의 초당 1024 패킷 한도에 걸려 DNS 조회가 간헐적으로 타임아웃됐다."},"org":"unknown","org_slug":"unknown","date":"2025-08-12","severity":"unknown","root_cause":"capacity","url":"https://benchlet.com/incidentlib/app/cases/IL-0048","shared_components":["coredns","dns-resolver"]},{"id":"IL-0027","title":{"en":"All CoreDNS pods landed on one node, the node ran out of memory, and DNS for the whole service went down","ko":"CoreDNS 파드가 모두 한 노드에 몰린 채 그 노드의 메모리가 고갈되자 DNS 가 응답하지 못해 아이디어스 서비스 전체가 멈췄다"},"org":"Backpackr","org_slug":"backpackr","date":"2025-05-07","severity":"unknown","root_cause":"capacity","url":"https://benchlet.com/incidentlib/app/cases/IL-0027","shared_components":["coredns","dns-resolver"]},{"id":"IL-0182","title":{"en":"Too few CoreDNS replicas on EKS were overloaded during traffic spikes, raising latency and cutting the network for task pods, and the over-provisioned, tightly spread CoreDNS pods added later blocked Karpenter consolidation","ko":"트래픽이 급변할 때 수가 모자란 CoreDNS 가 과부하로 지연과 간헐적 네트워크 끊김을 일으켰고, 나중에는 과하게 늘린 CoreDNS 파드가 Karpenter 의 노드 통합을 막았다"},"org":"이언철","org_slug":"이언철","date":"2024-04-16","severity":"unknown","root_cause":"capacity","url":"https://benchlet.com/incidentlib/app/cases/IL-0182","shared_components":["coredns","hpa"]},{"id":"IL-0445","title":{"en":"Chatwork's service on EKS became unstable as conntrack tables on some nodes overflowed and connections were dropped","ko":"EKS 로 옮기던 레거시 시스템에서 conntrack 테이블이 넘쳐 연결이 끊겼고, 이어 CoreDNS 파드가 축출될 때와 node-local-dns 를 넣은 뒤에 DNS 오류가 났다"},"org":"Chatwork","org_slug":"chatwork","date":"2021-01-05","severity":"unknown","root_cause":"capacity","url":"https://benchlet.com/incidentlib/app/cases/IL-0445","shared_components":["coredns","dns-resolver"]},{"id":"IL-0001","title":{"en":"Cluster-wide DNS outage after CoreDNS pods were OOM-killed again and again under a burst of DNS queries","ko":"CoreDNS 파드가 메모리 한도 100Mi 에 걸려 OOM 으로 계속 죽으면서 쿠버네티스 클러스터 전체의 DNS 가 멈췄다"},"org":"Zalando","org_slug":"zalando","date":"2019-01-07","severity":"unknown","root_cause":"capacity","url":"https://benchlet.com/incidentlib/app/cases/IL-0001","shared_components":["coredns","dns-resolver"]},{"id":"IL-0155","title":{"en":"Some DOKS clusters in NYC1 saw intermittent DNS timeouts and NodeNotReady events because CoreDNS ran on shared-CPU Droplet worker nodes","ko":"NYC1 의 일부 DOKS 클러스터에서 공유 CPU 노드 위의 CoreDNS 때문에 DNS 가 간헐적으로 실패하고 NodeNotReady 가 났다"},"org":"DigitalOcean","org_slug":"digitalocean","date":"2026-07-09","severity":"unknown","root_cause":"capacity","url":"https://benchlet.com/incidentlib/app/cases/IL-0155","shared_components":["coredns"]},{"id":"IL-0082","title":{"en":"Losing one CoreDNS pod during a planned EKS node reroll overloaded the remaining CoreDNS pods, causing DNS timeouts and errors across multiple services at RebelMouse","ko":"EKS 노드 교체 중 CoreDNS 파드 하나가 종료되자 남은 CoreDNS 파드가 늘어난 부하를 버티지 못해 DNS 조회가 느려지고 타임아웃이 났다."},"org":"RebelMouse","org_slug":"rebelmouse","date":"2025-05-19","severity":"unknown","root_cause":"capacity","url":"https://benchlet.com/incidentlib/app/cases/IL-0082","shared_components":["coredns"]},{"id":"IL-0204","title":{"en":"An etcd memory spike overloaded the control plane of a Render Frankfurt cluster, and DNS then failed because CoreDNS ran on the rebooted control plane nodes and could not start without the API server","ko":"Render 프랑크푸르트 클러스터에서 etcd 메모리 급증으로 컨트롤 플레인이 과부하에 걸렸고, 컨트롤 플레인 노드를 재부팅하자 그 위의 CoreDNS 가 다시 뜨지 못해 DNS 가 멈췄다."},"org":"Render","org_slug":"render","date":"2024-12-17","severity":"unknown","root_cause":"capacity","url":"https://benchlet.com/incidentlib/app/cases/IL-0204","shared_components":["coredns"]},{"id":"IL-0440","title":{"en":"Pods on Cybozu's Neco Kubernetes platform got frequent no such host and i/o timeout DNS errors from dropped packets","ko":"파드가 보낸 DNS 쿼리 패킷이 노드에서 버려져 클러스터 내부 서비스의 이름 조회가 no such host 와 i/o timeout 으로 자주 실패했다"},"org":"Cybozu","org_slug":"cybozu","date":"2024-08-20","severity":"unknown","root_cause":"capacity","url":"https://benchlet.com/incidentlib/app/cases/IL-0440","shared_components":["dns-resolver"]},{"id":"IL-0028","title":{"en":"Temporal History service latency rose because its pods were CPU-throttled while CPU usage read below 60 percent","ko":"쿠버네티스에서 Temporal History 파드가 CPU 사용률이 60% 아래인데도 CPU 스로틀링을 받아 요청 지연이 불안정했다"},"org":"Temporal","org_slug":"temporal","date":"2023-06-13","severity":"unknown","root_cause":"capacity","url":"https://benchlet.com/incidentlib/app/cases/IL-0028","shared_components":["cpu-limit"]},{"id":"IL-0033","title":{"en":"Uneven load across kube-dns pods and a DNS packets-per-second limit pushed service latency to 20 seconds","ko":"kube-dns 파드 사이의 트래픽 불균형과 DNS 초당 패킷 한도 때문에 외부 DNS 조회가 많은 여러 서비스의 지연 시간이 20초까지 늘었다"},"org":"Airbnb","org_slug":"airbnb","date":"2019-11-21","severity":"unknown","root_cause":"capacity","url":"https://benchlet.com/incidentlib/app/cases/IL-0033","shared_components":["dns-resolver"]}]