Description
Knot DNS Resolver is a caching full resolver implementation written in C and LuaJIT, both a resolver library and a daemon. The core architecture is tiny and efficient, and provides a foundation and
a state-machine like API for extensions. There are four of those built-in - iterator, validator and two caching modules. Most of the rich features are written in Lua(JIT) and C. Batteries are included, but optional.
The LuaJIT modules, support DNS privacy and DNSSEC, and persistent cache with low memory footprint make it a great personal DNS resolver or a research tool to tap into DNS data. TL;DR it's the OpenResty of DNS.
Several cache backends (LMDB, Redis and Memcached), strong filtering rules, and auto-configuration with etcd make it a great large-scale resolver solution.
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) that allows you to pin instances on available CPU c
Knot DNS Resolver alternatives and similar tools
Based on the "DNS" category
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Yadifa
Lightweight authoritative Name Server with DNSSEC capabilities powering the .eu top-level domain. -
dnsmasq
A lightweight service providing DNS, DHCP and TFTP services to small-scale networks.
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README
Knot Resolver
Knot Resolver is a caching full resolver implementation written in C and LuaJIT, both a resolver library and a daemon. The core architecture is tiny and efficient, and provides a foundation and a state-machine like API for extensions. There are three modules built-in - iterator, validator, cache, and a few more are loaded by default. Most of the rich features are written in Lua(JIT) and C. Batteries are included, but optional.
The LuaJIT modules, support DNS privacy and DNSSEC, and persistent cache with low memory footprint make it a great personal DNS resolver or a research tool to tap into DNS data. TL;DR it's the OpenResty of DNS.
Strong filtering rules, and auto-configuration with etcd make it a great large-scale resolver solution.
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) that allows you to pin instances on available CPU cores and grow by self-replication. You can start and stop additional nodes depending on the contention without downtime.
It also has strong support for DNS over TCP, notably TCP Fast-Open, query pipelining and deduplication, and response reordering.
Packages
The latest stable packages for various distributions are available in our upstream repository. Follow the installation instructions to add this repository to your system.
Knot Resolver is also available from the following distributions' repositories.
Building from sources
Knot Resolver mainly depends on Knot DNS libraries, LuaJIT and libuv. See the Building project documentation page for more information.
Docker image
This is simple and doesn't require any dependencies or system modifications, just run:
$ docker run -Pit cznic/knot-resolver
The images are meant as an easy way to try knot-resolver, and they're not designed for production use.
Running
The project builds a resolver library in the lib directory, and a daemon in the daemon directory. It requires no configuration or parameters to run a server on localhost.
$ kresd
See the documentation at knot-resolver.readthedocs.io for more options.
Contacting us
- GitLab issues (you may authenticate via GitHub)
- mailing list
