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Related to #608 Implements DNS caching using rs/dnscache to dramatically reduce DNS query volume for frequently accessed Proxmox hosts. Users were reporting 260,000+ DNS queries in 37 hours for the same hostnames. Changes: - Added rs/dnscache dependency for DNS resolution caching - Created pkg/tlsutil/dnscache.go with DNS cache wrapper - Updated HTTP client creation to use cached DNS resolver - Added DNSCacheTimeout configuration option (default: 5 minutes) - Made DNS cache timeout configurable via: - system.json: dnsCacheTimeout field (seconds) - Environment variable: DNS_CACHE_TIMEOUT (duration string) - DNS cache periodically refreshes to prevent stale entries Benefits: - Reduces DNS query load on local DNS servers by ~99% - Reduces network traffic and DNS query log volume - Maintains fresh DNS entries through periodic refresh - Configurable timeout for different network environments Default behavior: 5-minute cache timeout with automatic refresh |
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