Kubernetes & Docker debugging
CrashLoopBackOff, OOMKilled pods, pending scheduling, service/DNS resolution, volume mounts, and multi-stage build and cache traps.
32 guides
Debugging guides
Docker container cannot connect to localhost: how to debug itDocker/deployment debugging · BeginnerCase-sensitive import fails on Linux: how to debug itDocker/deployment debugging · BeginnerCron job not running in production: how to debug scheduled tasksDocker/deployment debugging · IntermediateKubernetes pod CrashLoopBackOff: how to debug crashing podsDocker/deployment debugging · AdvancedSSL certificate error after deployment: how to debug TLS issuesDocker/deployment debugging · IntermediateDebugging CrashLoopBackOff Failures in Kubernetes PodsKubernetes · AdvancedDiagnosing Broken Networking in Docker ContainersDocker · IntermediateDebugging Kubernetes Pod OOMKilled: Beyond the Memory LimitKubernetes · IntermediateKubernetes Pod Stuck in Pending: Debugging Resource and Scheduling FailuresKubernetes · IntermediateKubernetes Service Not Reachable from Pod: Debugging Ingress, DNS & Network PoliciesKubernetes · IntermediateKubernetes ConfigMap Not Mounting as Volume – Debugging GuideKubernetes · IntermediateKubernetes PersistentVolumeClaim Stuck in Pending: Debugging GuideKubernetes · IntermediateKubernetes RBAC 403 Forbidden: Debugging Authorization DenialsKubernetes · IntermediateKubernetes Ingress Not Routing Traffic: A Debugging GuideKubernetes · IntermediateKubernetes HPA Not Scaling: Diagnosing and Fixing Stuck AutoscalersKubernetes · AdvancedKubernetes Node Not Ready: Beyond the TextbookKubernetes · AdvancedKubernetes Pod DNS Resolution Failure: Debugging Steps & FixesKubernetes · IntermediateDebugging Kubernetes Resource Quota ExceededKubernetes · IntermediateDebugging Kubernetes Init Containers That Never CompleteKubernetes · IntermediateDebugging Missing Artifacts in Docker Multi-Stage BuildsDocker · IntermediateDocker Build Cache Invalidation: Why Your Builds Are SlowDocker · IntermediateDocker Permission Denied When Running a ContainerDocker · BeginnerDocker Volume Mount Not Showing Files: A Practical Debugging GuideDocker · IntermediateDocker Healthcheck Always Failing: Diagnosis and FixesDocker · IntermediateDocker Compose depends_on Not Waiting – Why Your App Starts Before the Database Is ReadyDocker · IntermediateDocker Compose Services Cannot Reach Each Other: A Debugging GuideDocker · IntermediateHelm Chart Release Failed: Debugging Tillerless DeploymentsKubernetes · AdvancedKubernetes Job Hangs: Debugging Pods That Never CompleteKubernetes · IntermediateKubernetes Sidecar Container Not Starting: Pod Lifecycle DebuggingKubernetes · IntermediateKubernetes Pod Affinity Scheduling Not Placing: Debugging Why Pods Stay PendingKubernetes · AdvancedIstio Sidecar Envoy 503: Debugging Upstream Connection FailuresKubernetes · AdvancedLinkerd mTLS Handshake Failures: A Practical Debugging GuideKubernetes · Advanced