As I am setting up my infrastructure at home using docker I wanted to ask, is it better to have DNS, something like pi-hole, on my main docker swarm or would it be better to have it on a dedicated machine/docker host separate from the rest of my infrastructure?
A recursive DNS server and a local DNS cache/forwarder/are two different things with two different purposes. You will always need both.
Why do you need two separate ones though? Recursive DNS servers also cache responses. Usually the only reason you’d run a local forwarder/cache is if you’re not running a local recursive server.
For the same reason you’re running AdGuard and not just pointing all your devices at the recursive upstream.
You’re using AdGuard / Pihole as an ad sinkhole, not just to cache and forward DNS requests. Like if you really wanted to you could hack together something in Unbound to do that, but why would you do that when Pihole already exists? You have two things built for purpose.
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Why do you need two separate ones though? Recursive DNS servers also cache responses. Usually the only reason you’d run a local forwarder/cache is if you’re not running a local recursive server.
For the same reason you’re running AdGuard and not just pointing all your devices at the recursive upstream.
You’re using AdGuard / Pihole as an ad sinkhole, not just to cache and forward DNS requests. Like if you really wanted to you could hack together something in Unbound to do that, but why would you do that when Pihole already exists? You have two things built for purpose.