DNS config with docker

Docker not shares the hosts nameservers and nameresolves(which exists on /etc/resolve.conf in host). To specify the external name servers and name resolves docker options can be used.

Add following configs to docker config file to setup external nameservers and nameresolves. Config files exists in /etc/default/docker on linux or /var/lib/bootdocker/profile OSX.

set name servers

DOCKER_OPTS=”--dns=10.13.20.15 --dns=8.8.8.8"

set search domain

DOCKER_OPTS=”--dns-search=pagero.local"

example docker config

Following is the example config file which exists on /etc/default/docker on linux

example resolve.conf

Following is the /etc/resolve.conf file of the docker container. To view this I have connected to running docker container via the command

docker exec -it <container id> bash
docker exec -it abf1b8c091f5 bash