🔒 Implement Secure Anonymous DNS Resolver

[sob]

Overview

Deploy a privacy-focused DNS resolution system in the network namespace that provides:

• Standard DNS (port 53) with no client configuration needed
• DNS-over-HTTPS (DoH) support for privacy-aware clients
• Anonymous upstream resolution via DNSCrypt with relay routing
• High-performance caching with Unbound
• IP-based access control

Architecture

• Frontend: Unbound (port 53) + DoH endpoint (port 443)
• Backend: DNSCrypt-proxy with anonymized relays
• Caching: Multi-tier with persistence
• Monitoring: Prometheus metrics + Grafana dashboards

Structure

kubernetes/apps/network/dns-resolver/
├── dnscrypt-proxy/
├── unbound/
└── shared/

Acceptance Criteria

• Standard DNS queries work from allowed IPs
• DoH endpoint accessible and functional
• Anonymous relay routing verified
• Monitoring dashboards operational
• Performance meets <50ms average latency
• Documentation complete

Technical Requirements

• Latency: <50ms p99 for cached queries
• Throughput: 10k+ queries/second
• Availability: 99.9% uptime SLO
• Cache Hit Rate: >80% after warm-up
• Security: DNSSEC validation, access control, encrypted upstream

Implementation Tracking

This epic will be implemented through 8 phases, each tracked as a separate issue.

Implementation Phases

Phase Issues:

• Phase 1: DNS Resolver Foundation & Structure #1094 - Phase 1: Foundation & Structure
• Phase 2: DNSCrypt-proxy Implementation #1095 - Phase 2: DNSCrypt-proxy Implementation
• Phase 3: Unbound Implementation #1096 - Phase 3: Unbound Implementation
• Phase 4: Services & Networking Configuration #1097 - Phase 4: Services & Networking
• Phase 5: TLS & Certificate Management #1098 - Phase 5: TLS & Certificates
• Phase 6: Monitoring & Observability #1099 - Phase 6: Monitoring & Observability
• Phase 7: Testing & Validation #1100 - Phase 7: Testing & Validation
• Phase 8: Documentation & Rollout #1101 - Phase 8: Documentation & Rollout

Track progress through these linked issues.