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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] 12 points 3 days ago

Just be sure that the second server in the list is also a black hole. If you don't, all black holed requests will fallback to the second DNS... which, if it doesn't also black hole them, will wind up serving you ads and defeating the point!

Personally I find a single Pi is just fine for DNS. It only takes like 10 seconds to reboot. Less, if you use M.2 storage via a HAT or boot from USB! That's pretty fine downtime. But if you're afraid you'll knock over the network and get yelled at by your family or housemates, best to use a backup :)