Learning CoreDNS

Table of contents

1. Preface
   1. Why a New DNS Server?
   2. Who Needs CoreDNS?
   3. Who This Book Is For
   4. What You Will Learn
   5. Conventions Used in This Book
   6. Using Code Examples
   7. O’Reilly Online Learning
   8. How to Contact Us
   9. Acknowledgments
2. 1. Introduction
   1. What Is CoreDNS?
      1. CoreDNS, Containers, and Microservices
      2. CoreDNS Limitations
      3. CoreDNS, Kubernetes, and the Cloud Native Computing Foundation
3. 2. A DNS Refresher
   1. What Is the Domain Name System?
   2. Domain Names and the Namespace
   3. Domains, Delegation, and Zones
   4. Resource Records
   5. DNS Servers and Authority
   6. Resolvers
   7. Resolution and Recursion
   8. Caching
   9. Resource Records
      1. NAME
      2. TTL
      3. CLASS
   10. Resource Record Types
       1. The A Record
       2. The AAAA Record
       3. The CNAME Record
       4. The MX Record
       5. The NS Record
       6. The SRV Record
       7. The PTR Record
       8. The SOA Record
   11. An Annotated Zone Data File
4. 3. Configuring CoreDNS
   1. Getting CoreDNS
   2. CoreDNS Command-Line Options
   3. Corefile Syntax
      1. Environment Variables
      2. Reusable Snippets
      3. Import
      4. Server Blocks
      5. Query Processing
   4. Plug-ins
      1. Root
      2. File
      3. Secondary
      4. Forward
      5. Cache
      6. Errors
      7. Log
   5. Common Configuration Options
      1. fallthrough
      2. tls
      3. transfer to
   6. Sample DNS Server Configurations
      1. Caching-Only DNS Server
      2. Primary DNS Server
      3. Secondary DNS Server
5. 4. Managing Zone Data
   1. The file Plug-in
   2. The auto Plug-in
      1. Using the auto Plug-in with Git
   3. The hosts Plug-in
   4. The route53 plug-in
6. 5. Service Discovery
   1. Introduction to Service Discovery
   2. Solving the Service Discovery Problem
   3. Service Discovery with CoreDNS and etcd
      1. The etcd Plug-in
      2. Other Service Discovery Options
   4. Service Discovery and Container Orchestration
7. 6. Kubernetes
   1. Basic Concepts
   2. Kubernetes Networking
      1. Cluster IP Services
      2. Headless Services
   3. Kubernetes DNS Specification
   4. CoreDNS Integration
   5. Default Configuration
   6. Stub Domains and Federations
   7. Cluster DNS Deployment Resources
      1. Role-Based Access Control
      2. Service
      3. Deployment
   8. Autoscaling
   9. A Better Configuration
   10. The kubernetes Plug-in
   11. CoreDNS Extensions
       1. Pod Options
       2. Wildcard Queries
       3. Autopath and the Dreaded ndots:5
       4. Zone Transfer Support
       5. Exposing Services Externally
       6. Modifying the Available Records
8. 7. Manipulating Queries and Responses
   1. The template Plug-in
   2. The rewrite Plug-in
      1. Using the rewrite Plug-in for EDNS0 Options
      2. Multiple rewrite Rules
   3. The metadata Plug-in
   4. Signing Responses with the DNS Security Extensions
      1. Managing a DNSSEC-Signed Primary Zone
      2. On-the-Fly DNSSEC Signing with the dnssec Plug-in
   5. Case Study: Infoblox’s BloxOne Threat Defense
      1. Identifying Users
      2. Applying Policy
9. 8. Monitoring and Troubleshooting
   1. The prometheus Plug-in
   2. The log Plug-in
   3. The dnstap Plug-in
   4. The errors Plug-in
   5. The trace Plug-in
   6. The debug Plug-in
10. 9. Building a Custom Server
    1. Compiling CoreDNS with an External Plug-in
       1. Building Using Docker
       2. Building on Your Workstation
       3. Modifying plugin.cfg
       4. Replacing main
    2. Writing a Custom Plug-in
       1. There Can Be Only One
       2. Integrating with Metrics, Trace, and Metadata
11. Index