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How do you host your DNS sinkhole/resolver? (self.selfhosted)

submitted 3 days ago* (last edited 2 days ago) by ohshit604 to c/[email protected]

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Currently have nice long docker compose file that hosts my PiHole V6 container (along with a bunch of other containers) however, reason i ask this question is because whenever I go to pull an updated image and recreate the container I experience about 20 minutes of no DNS resolution which to my knowledge is due to the NTP clock being out of sync.

What’s the best way to host a DNS sinkhole/resolver that can mitigate this issue?

Was thinking of utilizing Proxmox & LXC but I suspect I’ll get the same experience.

~~Update: Turns out PiHole doesn’t support two instances, I got both of them on separate devices also set the 2nd DNS server in my routers WAN & LAN DNS settings which did in fact split DNS between both instances however, I lost access to my routers web-ui, my Traefik instance & reverse proxies died and I lost all internet access.~~

~~So, don’t do what I did.~~

Update 2: So everything I said in my first update let’s disregard that, turns out I had my router forcing all DNS to PiHole server 1 which caused my issues mentioned above.

Two servers appears to work!

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[–] [email protected] 8 points 3 days ago* (last edited 3 days ago) (1 children)

For a critical service like DNS, I decided to set it up bare metal on a Raspberry Pi 2 (even a Pi Zero should work). It's been working fine for years, I just update it from time to time. That way I can mess with my homelab without worrying about DNS issues.

[–] [email protected] 3 points 3 days ago (1 children)

Funny enough, the Pi Zero uses the CPU from the 3 and the Zero 2 uses the CPU from the 3+, so they're both more powerful than a 2 anyway :)

[–] [email protected] 6 points 3 days ago (1 children)

Pi Zero uses the CPU from the 3

No, the original Pi Zero uses the CPU of the Pi1 (only clocked higher). So it is quite a bit slower than a Pi 2, since it has only a single ARMv6 CPU core. Still fine for a DNS server on a typical home network.

[–] [email protected] 2 points 1 day ago

Aha, thank you. Shouldn't have riffed from memory on that one, I suppose!

But very much agreed: the Zero series has plenty of beef for a DNS server. Maybe when the 3 comes out I'll add one as a backup for my 4 server.