Browse incidents, troubleshooting guides, AI diagnostics, verified fixes and community discussions related to Kubernetes.
## Environment GKE-like cluster: two node pools — old pool (Ubuntu 18.04, no hugepages) where workload stable, upgraded node pool (Ubuntu 20.04, kernel 5.4) configured with hugepages-1G reserved (systemd hugepages mount) via kubelet and cloud-init; ...
## Environment On-prem Kubernetes 1.23 control plane, 5 worker nodes (Ubuntu 20.04, Docker 20.10.12, kubelet configured with cgroupDriver=systemd). Workers: 128GB RAM, 32 vCPU. Applications deployed as Deployments with requests/limits set (example: ...
## Environment On-prem K8s 1.25 cluster running kubelet systemd service on Ubuntu 22.04 nodes. CSI driver for vendor SAN is deployed as a DaemonSet (node plugin) and StatefulSet (controller). Problem observed after rolling nodes to a new image with ...
## Environment On-premises k8s: control plane on Ubuntu 20.04, worker nodes running Debian 11, kube-proxy switched from iptables to IPVS mode via kubeadm; CoreDNS v1.8.0 in kube-system; Calico CNI in use (policy only), nodes use systemd-resolved loc...
## Environment EKS-like on-prem Kubernetes cluster v1.24 running kubelet 1.24, containerd runtime, nodes are 64GB RAM Linux VMs (Ubuntu 22.04) with kube-reserved 1Gi and system-reserved 1Gi configured. A microservice (Go binary) requests 512Mi and s...
## Environment EKS cluster: Kubernetes 1.23 control plane, AWS NLB in front of nginx-ingress-controller Service (type=LoadBalancer) with proxy-protocol v2 enabled; several apps expose gRPC services via HTTP/2 through the ingress. ## Symptoms Exter...
## Environment On-prem K8s cluster v1.25 with kubelet on Ubuntu 22.04 nodes, pods mount ConfigMap via projected volume (volumeMount to /app/config). Pod runs a Java application under OpenJDK 17 that reads configuration files on startup. ConfigMap up...
## Environment On-prem K8s cluster (v1.26) with containerd 1.7, nodes provisioned from a node pool with 200 GB root disk; workloads include several large images (~2–6 GB each) and a nightly batch job that pulls and extracts images concurrently. ## ...
## Environment On-prem kubeadm cluster: control plane on v1.26, worker nodes were recently upgraded from kubelet v1.25 to v1.27. Storage: Ceph RBD provisioned via CSI driver v3.x; nodes use kernel rbd module and rbd-nbd helpers. StatefulSet with Rea...
## Environment Google Kubernetes Engine (GKE) Autopilot cluster v1.25.7-gke.1200 with two node pools: pool-a (n1-standard-4) and pool-b (n2-standard-2). Cluster uses CoreDNS (coredns/coredns:1.8.4) as DNS add-on, Cloud NAT for outbound internet, Cal...