Base
Hardened build
minimal ports, security patches applied at build time
gdnsd on Ubuntu 24.04 LTS
Azure
Networking
gdnsd, a fast authoritative only DNS server that serves the zones for your own domains, with built in weighted and multi address failover and geographic answers.
Overview
gdnsd is an open source authoritative only DNS server, a single compiled daemon that publishes the DNS records for the domains you own and answers queries for those zones directly from memory. It is not a recursive resolver: it never resolves names on behalf of clients, so it cannot be abused as an open resolver. Its behaviour is driven entirely by a configuration file plus plain text zone files, with no database and no web console, and it is well known for weighted, health checked and geographic load balancing answers.
Why the cloudimg image
The cloudimg image is hardened and fully patched with gdnsd built from the official upstream release and running as a dedicated non root service that binds port 53 with a single Linux capability rather than as root. It ships secure by default and authoritative only: queries outside your zones are refused, zone transfers are not served to unauthorised clients, and administration is local only over a private control socket. First boot bakes the instance IP into a demonstration zone and a working weighted failover resource, and every instance is backed by a paired deploy guide and 24/7 cloudimg support.
Common uses
- Authoritative DNS for your own domains
- Weighted and multi address failover load balancing
- Geographic DNS answers with your own MaxMind database
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