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I'm running Docker version 17.12.0-ce, build c97c6d6 on ubuntu 14.04.

If I do 

docker run -it busybox ping -c 1 www.google.com

It's working.

Now if I try 

docker network create mynetwork
docker run -it --network mynetwork busybox ping -c 1 www.google.com

It's not working anymore.

I first thought of an internet access problem but with

docker run -it --network mynetwork busybox ping -c 1 216.58.201.228

it's working again.

So the problem seems to be a dns problem.

I remarked

docker run -it busybox cat /etc/resolv.conf
nameserver 213.186.33.99
search ovh.net

and

docker run -it --network mynetwork busybox cat /etc/resolv.conf
search ovh.net
nameserver 127.0.0.11
options ndots:0

And eventually 

docker run -it --network mynetwork --dns 213.186.33.99 busybox ping -c 1 www.google.com

is also working.

Is it normal ? Reading the docker documentation I thought I had read that the resolv.conf of the host was 'mounted' in the container. Why not with the custom network ?

What's the solution ?

mohan08p
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tweetysat
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0 Answers0