A caching full DNS resolver
The Knot DNS Resolver is a caching full resolver implementation written in C
and LuaJIT, including both a resolver library and a daemon. Modular
architecture of the library keeps the core tiny and efficient, and provides a
state-machine like API for extensions. There are three built-in modules -
iterator, cache, validator, and many external.
The Lua modules, switchable and shareable cache, and fast FFI bindings makes it
great to tap into resolution process, or be used for your recursive DNS
service. It's the OpenResty of DNS.
The server adopts a different scaling strategy than the rest of the DNS
recursors - no threading, shared-nothing architecture (except MVCC cache that
may be shared). You can start and stop additional nodes depending on the
contention without downtime.