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Troubleshooting Kubernetes Network Issues A Comprehensive Guide +91-7032290546 www.visualpath.in
Understanding Kubernetes Networking • Kubernetes relies on networking for pod-to-pod communication, services, and external traffic. Key Components: • Pod Networking (Unique IP per pod) • Service Networking (Abstracts pod communication) • Ingress & Egress (Traffic entering or leaving the cluster) +91-7032290546 www.visualpath.in
Diagnosing Pod-to-Pod Communication • Verify Pod IPs:Use kubectl get pods -o wide to check pod IPs. • Connectivity Tests: Use ping or curl within pods to check if they can reach other pods. • Network Policies: Ensure that network policies aren't blocking communication. +91-7032290546 www.visualpath.in
Examining Services and Endpoints • Service Configuration: Use kubectl describe svc <service-name> to verify service details. • Endpoints: Ensure services are correctly linked to pods via kubectl get endpoints <service-name>. • DNS Issues: Verify CoreDNS logs to ensure DNS resolution is working. +91-7032290546 www.visualpath.in
Troubleshooting Ingress & Egress Traffic • Ingress Configuration: Ensure ingress controllers are properly set up. • Egress Traffic: Review network policies related to traffic leaving the cluster. • Check Logs: Review logs of ingress controllers and egress configurations. +91-7032290546 www.visualpath.in
Inspecting the CNI (Container Network Interface) • CNI Plugins: Ensure the CNI plugin (e.g., Calico, Flannel) is running properly. • Configuration Files: Verify CNI configuration in /etc/cni/net.d/. • Logs: Check CNI-related logs for errors or network issues. +91-7032290546 www.visualpath.in
Resource Constraints & Node Pressure • Monitor Resource Usage: Use kubectl top pods or kubectl top nodes to track CPU and memory. • Node Resources: Ensure nodes have enough available resources to run networking components smoothly. • Throttling: Check for throttling or over-commitment on nodes. +91-7032290546 www.visualpath.in
Reviewing Cluster Logs • Kubelet Logs: Check journalctl -u kubelet for pod lifecycle issues. • API Server Logs: Review control plane logs for issues in service or pod communication. • CoreDNS Logs: Check logs for DNS resolution problems. +91-7032290546 www.visualpath.in
Network Performance & Latency • Monitoring Tools: Use tools like Weave Scope, Prometheus, and Grafana to monitor network performance. • Latency & Packet Loss: Investigate any issues related to high latency, packet loss, or bandwidth throttling. • Troubleshoot Performance: Visualize traffic and pinpoint performance bottlenecks. +91-7032290546 www.visualpath.in
For More Information About Docker and Kubernetes Address:- Flat no: 205, 2nd Floor, Nilagiri Block, Aditya Enclave, Ameerpet, Hyderabad-16 Ph. No: +91-998997107 Visit: www.visualpath.in E-Mail: online@visualpath.in +91-7032290546 www.visualpath.in
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