managing-dnslisted

# DNS Management Configure and automate DNS records with proper TTL strategies, DNS-as-code patterns, and troubleshooting techniques. ## Purpose Guide DNS configuration for applications, infrastructure, and services with focus on: - Record type selection (A, AAAA, CNAME, MX, TXT, SRV, CAA) - TTL strategies for propagation and caching - DNS-as-code automation (external-dns, OctoDNS, DNSControl) - Cloud DNS services comparison and selection - DNS-based load balancing patterns - Troubleshooting tools and techniques ## When to Use This Skill Apply DNS management patterns when: - Setting up DNS for new applications or services - Automating DNS updates from Kubernetes workloads - Configuring DNS-based failover or load balancing - Troubleshooting DNS propagation or resolution issues - Migrating DNS between providers - Planning DNS changes with minimal downtime - Implementing GeoDNS for global users ## Record Type Selection ### Quick Reference **Address Resolution:** - **A Record**: Map hostname to IPv4 address (example.com → 192.0.2.1) - **AAAA Record**: Map hostname to IPv6 address (example.com → 2001:db8::1) - **CNAME Record**: Alias to another domain (www.example.com → example.com) - Cannot use at zone apex (@) - Cannot coexist with other records at same name **Email Configuration:** - **MX Record**: Direct email to mail servers with priority - **TXT Record**: Email authentication (SPF, DKIM, DMARC) and verification **Service Discovery:** - **SRV Record**: Specify s