CoreDNS on Support Tools

IP-Based Pod DNS Resolution in Kubernetes: Advanced Service Mesh Integration and Enterprise Networking Patterns

Tue, 11 Aug 2026 00:00:00 -0500

IP-based Pod DNS resolution enables direct pod-to-pod communication patterns that are essential for advanced Kubernetes networking architectures, service mesh implementations, and enterprise applications requiring precise control over network connectivity. This comprehensive guide demonstrates production-ready configurations, security patterns, and operational strategies for implementing sophisticated pod networking solutions.

Enterprise LoadBalancer DNS with CoreDNS: Advanced Service Discovery and Network Architecture for Kubernetes Production Environments

Wed, 27 May 2026 00:00:00 -0500

CoreDNS serves as the cornerstone of modern Kubernetes networking, providing sophisticated DNS resolution and service discovery capabilities that enable enterprise-grade LoadBalancer implementations. This comprehensive guide demonstrates advanced CoreDNS deployment patterns, custom service discovery architectures, and production-ready networking strategies for large-scale Kubernetes environments.

Advanced CoreDNS Forwarding and Split-Horizon DNS: Enterprise Network Architecture for Complex Multi-Domain Environments

Wed, 25 Mar 2026 00:00:00 -0500

Advanced DNS forwarding architectures enable organizations to implement sophisticated network topologies with precise control over domain resolution across different network segments. CoreDNS provides the flexibility needed to build complex split-horizon DNS systems that support enterprise requirements for network segmentation, security isolation, and performance optimization.

RKE2 the Hard Way: Part 9 – Installing CoreDNS

Tue, 01 Apr 2025 00:00:00 +0000

Part 9 – Installing CoreDNS

In this part of the “RKE2 the Hard Way” training series, we will install and configure CoreDNS for Kubernetes cluster DNS resolution. CoreDNS is a flexible, extensible DNS server that serves as the cluster DNS provider in Kubernetes, allowing service discovery by DNS name.

DNS resolution is critical in a Kubernetes cluster because:

It enables services to be discovered by their names rather than IP addresses
It allows pods to find and communicate with other pods and services
It provides a stable naming scheme even when IPs change due to pod rescheduling

✅ Note: We already configured kubelet in Part 7 to use 10.43.0.10 as the DNS server, which is the IP we’ll use for the CoreDNS service.

CoreDNS and NodeLocal DNSCache: Troubleshoot and Monitor

Tue, 14 Jan 2025 00:00:00 -0500

DNS is the cornerstone of any Kubernetes cluster. CoreDNS answers cluster DNS queries, and NodeLocal DNSCache puts a caching resolver on every node in front of it. This guide explains how both work on RKE2, how to enable NodeLocal DNSCache with Canal or Cilium, how to troubleshoot failures and latency, and which Prometheus metrics to watch.

Deep Dive: Kubernetes DNS (CoreDNS)

Wed, 01 Jan 2025 00:00:00 -0500

CoreDNS serves as the DNS server in Kubernetes clusters, providing service discovery and name resolution. This deep dive explores its architecture, configuration, and advanced features.

A Deep Dive into CoreDNS with Rancher: Best Practices and Troubleshooting

Wed, 14 Aug 2024 05:15:00 -0500

In the evolving landscape of Kubernetes, DNS plays a crucial role in ensuring smooth service discovery and communication within and outside the cluster. CoreDNS, a flexible and scalable DNS server, has been the default choice for Kubernetes since version 1.14. In this post, we’ll dive into CoreDNS’s role within Rancher-managed Kubernetes environments, particularly focusing on RKE1 and RKE2. We’ll explore common issues, troubleshooting techniques, and best practices to optimize your CoreDNS setup.

K3s Pod DNS Not Resolving? Fix CoreDNS Forwarding

Sat, 18 May 2024 19:26:00 -0500

A name resolves fine from your laptop and from the K3s node, but pods get NXDOMAIN. On K3s this almost always comes down to which upstream resolver CoreDNS forwards to. This guide walks through how to prove that and the two supported fixes.

Using CoreDNS for LoadBalancer Addresses in Kubernetes

Sat, 18 May 2024 19:26:00 -0500

Learn how to use CoreDNS for LoadBalancer addresses in Kubernetes, ensuring seamless access to your services. This guide provides a detailed setup process.

How CoreDNS and NodeLocal DNSCache Work in Kubernetes

Fri, 03 Feb 2023 01:02:00 -0600

DNS is how pods find Services and the outside world. This post explains the actual path a DNS query takes in a Kubernetes cluster, what CoreDNS and NodeLocal DNSCache each do, and how to verify every hop when something breaks.