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Tencent Cloud Developer
Tencent Cloud Developer
May 8, 2023 · Cloud Native

Troubleshooting Common Kubernetes Networking Issues: Cross-VPC NodePort Timeouts, LB Pressure Test CPS Low, DNS Delays, and More

This guide walks through eight frequent Kubernetes networking problems in Tencent Cloud Kubernetes Service—such as cross‑VPC NodePort timeouts, low load‑balancer CPS, DNS resolution delays, apiserver access lag, mis‑configured resolv.conf, liveness‑probe failures, and externalTrafficPolicy = Local timeouts—explaining their root causes and providing concrete kernel, iptables, DNS, and configuration fixes.

DNSKubernetesLB
0 likes · 29 min read
Troubleshooting Common Kubernetes Networking Issues: Cross-VPC NodePort Timeouts, LB Pressure Test CPS Low, DNS Delays, and More
Xueersi Online School Tech Team
Xueersi Online School Tech Team
Apr 23, 2021 · Cloud Native

Understanding SNAT Port Conflicts in Kubernetes Container Networking and Mitigation Strategies

This article analyzes why Kubernetes pods experience occasional one‑second connect() delays due to SNAT port‑collision issues in the iptables conntrack table, explains the underlying networking mechanisms, and offers practical mitigation techniques such as random‑fully SNAT selection and long‑lived connections.

NetworkSNATcloud-native
0 likes · 9 min read
Understanding SNAT Port Conflicts in Kubernetes Container Networking and Mitigation Strategies