CODEWITHSUNDEEP
dockerdnsmasq
Abu Wuf
Abu Wuf

Reputation: 21

Docker container to change default DNS server

I am learning to work with Docker containers and I trying what I thought would be a simple exercise, but running into issues. I want to use a container to change the default DNS server that my machine uses.
So when I say

>>  host facebook.com

the result should be the same as 

>> host facebook.com _myserverIP_

So I looked around and found several images on Docker hub and based on those made this very simple Dockerfile: 

FROM alpine:latest
RUN apk --no-cache add dnsmasq 
COPY dnsmasq.conf /etc/dsnmasq.conf
EXPOSE 53/tcp 53/udp
VOLUME ["/etc/dnsmasq"]
CMD ["dnsmasq"]

in dnsmasq.conf, I put: 

log-queries
no-resolv
server= _myserverIP_

I build and run: 

docker build -t dns .
docker run --name dns3 -d -p 53:53/udp --cap-add=NET_ADMIN dns

this gives me 2c3f046593c5d6e664d202e78d92172c75f71b95c45a9ea307af49bd1e2d5125

but when I try to see what containers are running, I see that this container isn't even running, so I can't do the next step of checking if it is working.

I am clearly missing something basic, but can't figure out what.

Upvotes: 1

Views: 2175

Answers (1)

chris.va.rao
chris.va.rao

Reputation: 373

Your system will look in /etc/resolv.conf to determine what dns servers to use. Use this guide to determine how dnsmasq uses /etc/resolv.conf https://wiki.debian.org/HowTo/dnsmasq

I suspect you will need to mount resolv.conf as well.

Upvotes: 1

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