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leng - a fast DNS server with adblocking, built for self-hosting (github.com)

submitted 10 months ago by [email protected] to c/[email protected]

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A few months ago I went on a quest for a DNS server and was dissatisfied with current maintained projects. They were either good at adblocking (Blocky, grimd...) or good at specifying custom DNS (CoreDNS...).

So I forked grimd and embarked on rewriting a good chunk of it for it to address my needs - the result is leng.

it is fast
it is small
it is easy
you can specify blocklists and it will fetch them for you
you can specify custom DNS records with proper zone file syntax (SRV records, etc)
it supports DNS-over-HTTPS so you can stay private
it is well-documented
can be deployed on systemd, docker, or Nix

I have been running it as my nameserver in a Nomad cluster since! I plan to keep maintaining and improving it, so feel free to give it a try if it also fulfils your needs

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[–] MonkCanatella 2 points 10 months ago (3 children)

I think it does caching because grimd does caching. I want a dns filter and dns resolver that's selfhosted but still performant and low latency. Caching of course is big part of that because if you're running recursive queries every time, your ping will be like 100-200ms.

[–] [email protected] 1 points 10 months ago (2 children)

Leng will cache each step of recursion, and it relies on upstream resolvers to do recursion for it as well (like grimd), so you should not be seeing 200ms resolution in any scenario.

I am keen for you to give it a shot - if you do please make an issue if it's not behaving like you were hoping for

[–] MonkCanatella 1 points 10 months ago (1 children)

Ahh interesting. So do you have to manually set an upstream dns server?

[–] [email protected] 1 points 10 months ago

Correct, and much like grimd you can specify several. But unlike grimd, leng will perform recursion when the upstream server is not capable of resolving queries completely (namely, because a CNAME resolved by upstream somewhere points to a domain that is part of your custom DNS records, or vice versa)