Troubleshoot DNS Resolution Failures in Kubernetes скачать в хорошем качестве

Troubleshoot DNS Resolution Failures in Kubernetes

Immediate deep dive into Kubernetes DNS failure modes. Learn to diagnose why your Pods cannot resolve internal services or external domains. We start by analyzing the Pod's /etc/resolv.conf and move directly to inspecting CoreDNS health, logs, and the critical Corefile ConfigMap structure. Master the identification of silent killers: overly restrictive Network Policies blocking UDP 53 egress. We detail how to verify CNI IP table rules using kube-proxy chains and distinguish between Node-level and Pod-level resolution issues. Includes practical steps for using dig and tcpdump inside debug containers to pinpoint upstream server latency and firewall interception points. Essential troubleshooting for system analysts managing production Kubernetes clusters. 00:00: Pod resolv.conf Inspection 00:49: CoreDNS Health and Logs 01:32: Corefile ConfigMap Analysis 02:08: Network Policy Interception 02:50: CNI and IP Tables Verification 03:29: Node Level Resolution Differences 04:05: External DNS Failure Diagnostics 04:43: Advanced Debugging Tools 05:17: Remediation and Persistence ##KubernetesTroubleshooting ##CoreDNS ##K8sNetworking ##DNSTroubleshooting ##ITSM ##SystemAnalysis ##CNI