How to use docker selfhosted DNS server on phone over Tailscale?
reddit / selfhosted

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BunkerMoewe · 2023-11-22 20:33

Hello guys,

I'm trying to get Domain Names to work inside my Tailnet. My setup is
a Tailscale Docker container running inside a docker network. The DNS
server (dnsmasq) is also running inside this docker network. Tailscale
uses  --advertise-routes=172.18.0.0/16 to expose the docker network
and so the DNS server is theoreticly reachable over the Tailnet with
the IP 172.18.0.x, but I just cant figure out, how to tell my phone to
use this as its DNS server.

I would also like to still have another 'real' DNS server configured
for my phone, so I dont have to use my selfhosted DNS server for every
DNS lookup. From what I could gather already, Private DNS on android
is an option, that might work, but when I tried it, I couldnt enter my
DNS servers IP address and then, from how I understand it, this is my
only DNS server configured for the phone.

I hope I could describe my problem as good as possible and someone is
able to help me out. :)

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mabernu · 2023-11-22 21:18

I solved that setting up as "exit node" into the phone app a node into
tailnet with the dns server configured. I mean, wherever node inside
of your tailnet should working against your dns server and you can use
it like "exit node".

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MRP_yt · 2023-11-22 22:08

Inside tailscale admin panel, under DNS settings you can specify which
DNS server to use. I think by default that option is off.

I got my ON and pointing to 192.168.178.136 which is pihole. This
options forces every device in tailsnet hit Pihole for DNS .

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BunkerMoewe · 2023-11-22 22:11

Thank you very much. This sounds like exactly what I'm lookin for

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MRP_yt · 2023-11-22 22:22

No probs. I been using this feature since day one.
One thing please note: you can add more then 1 DNS IP address and they
will work from top down.
Which means if IP in 1st spot fails it will go to 2nd one. In my case
if pihole fails to resolve it it fallback to 2nd pihole instant and if
that fails 3rd place is for cloudflare 1.1.1.1