DNS on Support Tools

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 DNS Infrastructure and Security: Enterprise Implementation Guide

Mon, 30 Mar 2026 00:00:00 -0500

Advanced DNS infrastructure forms the foundation of enterprise network services, requiring sophisticated security measures, high availability, and optimal performance. This comprehensive guide explores enterprise DNS implementation, DNSSEC deployment, modern DNS security protocols, and production-ready architectures for mission-critical environments.

Enterprise Pi-Hole DNS Management Guide 2025: Advanced Automation, Security & Multi-Site Orchestration

Mon, 15 Sep 2025 10:00:00 -0800

Enterprise Pi-Hole DNS Management Guide 2025: Advanced Automation, Security & Multi-Site Orchestration

Managing DNS infrastructure with Pi-Hole at enterprise scale requires sophisticated automation, security hardening, and monitoring capabilities that extend far beyond basic conditional forwarding configuration. This comprehensive guide transforms simple DNSMasq configuration into enterprise-grade DNS management systems with automated deployment, security compliance, and intelligent orchestration.

Pi-Hole Architecture and Security Overview
Enterprise Conditional Forwarding Framework
Automated DNS Configuration Management
Multi-Site DNS Orchestration
Advanced Security Hardening
Comprehensive Monitoring and Alerting
Compliance and Audit Framework
Performance Optimization
Disaster Recovery and High Availability
Integration with Enterprise Systems
Advanced Troubleshooting
Best Practices and Recommendations

Pi-Hole Architecture and Security Overview

Enterprise DNS Infrastructure Requirements

Modern enterprise DNS infrastructure must handle complex routing scenarios, security requirements, and compliance mandates while maintaining high availability and performance across distributed networks.

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.

Using Kubernetes Ephemeral Debug Containers for Easy Troubleshooting

Fri, 10 Jan 2025 12:00:00 -0500

Kubernetes Ephemeral Debug Containers: A Game-Changer for Troubleshooting

If you’ve ever needed to spin up a debug container in Kubernetes, you know the pain of deploying temporary pods or adding tools to your production containers. Thankfully, Kubernetes ephemeral debug containers offer a better approach.

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.

What is DNS? A Beginner's Guide

Tue, 10 Dec 2024 18:00:00 -0500

By Matthew Mattox
Contact: mmattox@support.tools

DNS (Domain Name System) is often described as the “phonebook of the internet.” It translates human-readable domain names (like google.com) into IP addresses that computers use to communicate. While DNS works seamlessly most of the time, its occasional failures can lead to some of the most frustrating troubleshooting scenarios.

In this post, we’ll explore the basics of DNS, how it works, its structure, and why it’s such a fundamental part of modern networking.

Kubernetes DNS Optimization

Mon, 14 Oct 2024 19:26:00 -0500

DNS plays a critical role in Kubernetes clusters by enabling service discovery and communication between Pods and services. However, poor DNS performance can lead to high latency, timeouts, and a degraded user experience. Optimizing DNS in Kubernetes is essential for maintaining high performance, especially in large-scale environments with dynamic workloads.

In this post, we will explore key strategies for optimizing DNS in Kubernetes clusters, focusing on improving both reliability and latency.

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.

Mastering DNS Troubleshooting in Kubernetes

Wed, 20 Dec 2023 04:00:00 -0500

Understanding and resolving DNS issues in Kubernetes can be challenging. This workshop is designed to equip you with the skills and knowledge needed to effectively troubleshoot DNS problems in a Kubernetes environment.

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.

DNS Basics

Mon, 11 Jul 2022 19:26:00 -0500

DNS is a topic that some people just don’t get. My goal is to make it as simple as possible for you to understand.

DNS zones fall into three categories:

Forwarders
Conditional Forwarders
Zone Transfers

DNS on Support Tools

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

Advanced DNS Infrastructure and Security: Enterprise Implementation Guide

Enterprise Pi-Hole DNS Management Guide 2025: Advanced Automation, Security & Multi-Site Orchestration

Enterprise Pi-Hole DNS Management Guide 2025: Advanced Automation, Security & Multi-Site Orchestration

Table of Contents

Pi-Hole Architecture and Security Overview

Enterprise DNS Infrastructure Requirements

RKE2 the Hard Way: Part 9 – Installing CoreDNS

Part 9 – Installing CoreDNS

CoreDNS and NodeLocal DNSCache: Troubleshoot and Monitor

Using Kubernetes Ephemeral Debug Containers for Easy Troubleshooting

Deep Dive: Kubernetes DNS (CoreDNS)

What is DNS? A Beginner's Guide

Kubernetes DNS Optimization

K3s Pod DNS Not Resolving? Fix CoreDNS Forwarding

Mastering DNS Troubleshooting in Kubernetes

How CoreDNS and NodeLocal DNSCache Work in Kubernetes

DNS Basics