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This article explains why a Golang service running on AWS EC2 failed to use the system‑level DNS cache provided by nscd, causing excessive DNS queries that triggered request timeouts, and describes the investigation and optimization steps that resolved the issue.
This article outlines a step‑by‑step solution for exposing pod domain names inside a corporate network using CoreDNS with an etcd backend, including server and agent deployment, configuration, verification, and practical usage recommendations.
This article explains the definitions, types, and functions of IP addresses and domain names, describes how DNS resolves domain names to IPs, and outlines best practices for using each in API automation testing to improve maintainability, scalability, and reliability.
This article explains common Kubernetes DNS resolution failures, both for external domains and internal service discovery addresses, and provides a step‑by‑step troubleshooting workflow that includes checking CoreDNS, examining resolv.conf, adjusting DNS settings, and recreating CoreDNS when necessary.
This guide explains common Kubernetes DNS problems—including failure to resolve external domains, inter‑pod service discovery addresses, and related impacts on applications like Nginx reverse proxies—and provides step‑by‑step troubleshooting procedures such as checking CoreDNS, inspecting resolv.conf, and customizing dnsPolicy and dnsConfig in pod specifications.
This article explains the fundamentals of VLANs, single‑arm routing, layer‑3 switches, gateways, DNS, MAC addresses, and subnet masks, using clear analogies and examples to show how network segmentation and routing enable efficient communication within and between local networks.
This article explains the fundamentals of DNS, its role as an application‑layer protocol, and how Kubernetes generates and manages each pod's /etc/resolv.conf through kubelet, covering nameserver, search, ndots options, dnsPolicy choices, and custom dnsConfig examples.
This article explains the NodeLocal DNSCache solution for Kubernetes, describing how it reduces CoreDNS load, improves DNS query performance, and provides step‑by‑step deployment instructions with configuration examples and command‑line snippets for both IPTABLES and IPVS proxy modes.
Testing 150 popular domains from four Chinese cities shows OneDNS public version consistently leads with 9‑19 ms latency, followed closely by Alibaba DNS, while 114DNS, Tencent DNSPod and 360DNS lag behind, prompting users to seek free alternatives as Alibaba’s unlimited service becomes paid.
This article explains why CoreDNS may experience DNS resolution timeouts in a Kubernetes cluster, how to analyze logs and timeout settings, locate upstream DNS problems, and apply practical solutions such as adjusting timeout values, switching upstream DNS servers, and deploying a local DNS service.
This article explains the complete journey of a web request—from IP addressing, DNS resolution, and CDN acceleration, through TCP stream handling and message framing, to CGI/FastCGI execution, server model choices, and the evolution of data-layer architectures for scalable applications.
This article explains the complete browser navigation flow from URL entry to page rendering and provides practical optimization strategies for DNS resolution, HTTP protocols, CDN usage, and front‑end resources such as HTML, CSS, JavaScript, images, and fonts to improve performance and user experience.
The article walks through every stage of a web request—from IPv4 addressing, NAT, and DNS resolution through CDN proximity and TCP stream handling, to HTTP framing, CGI versus FastCGI processing, stateless versus stateful server models, and finally database scaling techniques such as sharding and Redis caching.
This article details the motivation, design, implementation, testing, and rollout of a refactored Kubernetes DNS solution that replaces the default kube-dns → CoreDNS chain with a node‑local q‑dnsmasq cache and parallel upstream queries to achieve higher availability, faster resolution, and better cache hit rates in large‑scale clusters.
The article walks through diagnosing and fixing a Git clone timeout on Windows by checking SSH connectivity, discovering DNS misresolution, and correcting the local hosts file to map github.com to its proper IP address, enabling successful repository cloning without a proxy.
This article provides a comprehensive guide to Kubernetes Service networking, covering container network models, intra‑ and inter‑node pod communication, Service‑Pod relationships, Service types (ClusterIP, NodePort, LoadBalancer, ExternalName), CoreDNS resolution, kube‑proxy operating modes, source IP preservation strategies, and Ingress handling.
The article walks through every step from typing a URL to final page rendering, detailing URL parsing, DNS lookup, TCP three‑way handshake and termination, HTTP request/response structure, congestion and flow control mechanisms, and the browser’s DOM, CSS, layout and painting processes.
This article explains the challenges of load balancing traffic across multiple Kubernetes clusters, reviews the shortcomings of commercial, public‑cloud, Karmada, and simple DNS approaches, and details how the open‑source k8gb project uses DNS and CoreDNS to provide an automated, cloud‑native GSLB solution with failover and multi‑cloud support.
This article explains step‑by‑step what occurs when a user types a URL and presses Enter, covering URL parsing, DNS resolution, TCP three‑way handshake and four‑way termination, HTTP request/response formation, and the browser’s rendering process, providing interview‑ready insights into web networking fundamentals.
This article explains what the Domain Name System (DNS) is, describes the three main DNS query types—recursive, iterative, and non‑recursive—and walks through the eight detailed steps a DNS lookup follows to resolve a domain name to an IP address.