Kubernetes Metrics Server No Metrics
Kubernetes metrics server returns no data when kubelet metrics endpoint is unreachable.
Category archive
Kubernetes fixes
Published troubleshooting guides for kubernetes issues.
Kubernetes Lease Object Stale
Kubernetes controller lease becomes stale when leader election fails to renew the lease.
Kubernetes CRD Validation Error
Kubernetes custom resource creation fails when input does not pass CRD validation schema.
Kubernetes Operator Reconciliation Failure
Kubernetes operator fails to reconcile custom resources when controller is stuck or API is unavailable.
Kubernetes Envoy Proxy High Latency
Kubernetes Envoy sidecar proxy introduces high latency due to misconfigured filters or resource constraints.
Kubernetes Istio mTLS Connection Failure
Kubernetes Istio mTLS connections fail when certificate rotation is misconfigured.
Kubernetes Service Mesh Sidecar Injection Failed
Kubernetes service mesh sidecar proxy is not injected when admission webhook fails.
Kubernetes Gateway API Not Working
Kubernetes Gateway API resources do not function when CRDs are not installed or controllers are missing.
Kubernetes CSI Driver Not Installed
Kubernetes CSI volumes fail when Container Storage Interface driver is not deployed.
Kubernetes Volume Node Affinity Conflict
Kubernetes pod cannot be scheduled when volume has node affinity that conflicts with pod placement.
Kubernetes Dynamic PV Provisioning Failed
Kubernetes dynamic provisioning fails when storage class provisioner is misconfigured or unavailable.
Kubernetes Ceph RBD Volume Failure
Kubernetes Ceph RBD volume cannot be mounted when Ceph cluster is unhealthy or credentials are wrong.
Kubernetes iSCSI PV Not Connecting
Kubernetes iSCSI PersistentVolume fails to connect when target is unavailable or CHAP authentication fails.
Kubernetes NFS Volume Mount Failure
Kubernetes pod cannot mount NFS volume when NFS server is unreachable or export path is invalid.
Kubernetes PVC Bound to Wrong PV
Kubernetes PersistentVolumeClaim binds to incorrect PersistentVolume due to label selector issues.
Kubernetes ResourceQuota Count Exceeded
Kubernetes cannot create resources when ResourceQuota object count limits are reached.
Kubernetes Admission Controller Rejection
Kubernetes API server rejects requests when admission controllers enforce policies.
Kubernetes Service Account Token Expired
Kubernetes pod loses API access when service account token expires and is not refreshed.
Kubernetes Affinity Rule Scheduling Failure
Kubernetes pod scheduling fails when node affinity or pod affinity rules cannot be satisfied.
Kubernetes Taint Toleration Mismatch
Kubernetes pod cannot be scheduled on tainted nodes without matching tolerations.
Kubernetes PriorityClass Not Found
Kubernetes pod scheduling fails when referenced PriorityClass does not exist.
Kubernetes LimitRange Violation
Kubernetes pod creation fails when requested resources violate LimitRange constraints.
Kubernetes Namespace Resource Quota Exceeded
Kubernetes cannot schedule pods when namespace resource quota is fully consumed.
Kubernetes Readiness Probe Not Passing
Kubernetes readiness probe fails when application startup is slower than probe configuration.
Kubernetes Liveness Probe False Positive
Kubernetes liveness probe kills healthy pods when probe configuration is too aggressive.
Kubernetes Init Container Failure
Kubernetes pod cannot start when init container fails due to errors in initialization logic.
Kubernetes PDB Blocking Eviction
Kubernetes PodDisruptionBudget prevents voluntary pod eviction during node maintenance.
Kubernetes HPA Not Scaling
Kubernetes HorizontalPodAutoscaler fails to scale when metrics server is unavailable or metrics are missing.
Kubernetes Container Runtime Not Ready
Kubernetes node cannot start containers when container runtime is down or misconfigured.
Kubernetes CNI Plugin Failure
Kubernetes CNI plugin fails to configure pod networking due to IP exhaustion or misconfiguration.
Kubernetes Kubelet Not Starting
Kubernetes kubelet fails to start due to configuration errors, certificate issues, or port conflicts.
Kubernetes API Server Unreachable
Kubernetes API server becomes unreachable due to network issues, certificate expiration, or resource exhaustion.
Kubernetes RBAC Permission Denied
Kubernetes API requests are denied when RBAC policies do not grant required permissions.
Kubernetes StatefulSet Headless Service Failure
Kubernetes StatefulSet pods cannot resolve DNS when headless service is misconfigured.
Kubernetes Helm Upgrade Failed
Kubernetes Helm upgrade fails due to validation errors, resource conflicts, or timeout issues.
Kubernetes Network Policy Blocking Traffic
Kubernetes NetworkPolicy inadvertently blocks pod-to-pod communication when misconfigured.
Kubernetes Secret Mount Permission Denied
Kubernetes pod cannot mount secrets when service account lacks permissions or secret is missing.
Kubernetes ConfigMap Not Mounting
Kubernetes pod fails to mount ConfigMap when the ConfigMap does not exist or RBAC denies access.
Kubernetes Evicted Pod
Kubernetes pod is evicted when node resources are under pressure or ephemeral storage exceeds limits.
Kubernetes OOMKilled Pod
Kubernetes pod is terminated with OOMKilled when memory limits are exceeded by the application.
Kubernetes Node Not Ready
Kubernetes node shows NotReady status when kubelet is stopped, network plugin fails, or resources are exhausted.
Kubernetes Persistent Volume Pending
Kubernetes PersistentVolumeClaim remains pending when storage class is missing or provisioner fails.
Kubernetes Ingress Controller 503 Error
Kubernetes ingress controller returns 503 when backend services are unavailable or misconfigured.
Kubernetes CoreDNS Not Resolving
Kubernetes internal DNS resolution fails when CoreDNS pods are unhealthy or misconfigured.
Kubernetes etcd Cluster Unhealthy
Kubernetes etcd cluster reports unhealthy status due to quorum loss, disk latency, or network partitions.
Kubernetes Service No Endpoints Available
Kubernetes service has no endpoints when pod selectors do not match or pods are not ready.
Kubernetes Pending Pod Scheduling Failure
Kubernetes pod remains in Pending state due to insufficient resources, node selectors, or affinity constraints.
Kubernetes ImagePullBackOff Error
Kubernetes cannot pull container image due to authentication failures, missing images, or network connectivity issues.
Kubernetes CrashLoopBackOff Error
Kubernetes pod enters CrashLoopBackOff state when application crashes repeatedly after restart attempts.
Kubernetes Pod Stuck in ContainerCreating State
Kubernetes pod remains in ContainerCreating state due to image pull failures, resource constraints, or storage provisioning issues.