The only changed from the great guide above was the Docker network setting:
sudo docker network create --subnet=10.10.0.0/16 bind9dns-net
And the subsequent commands to use the different network:
sudo docker run -d --rm --name=dns-server --net=bind9dns-net --ip=10.10.0.2 bind9
sudo docker run -d --rm --name=host1 --net=bind9dns-net --ip=10.10.0.3 --dns=10.10.0.2 ubuntu:bionic /bin/bash -c "while :; do sleep 10; done"
sudo docker run -d --rm --name=host2 --net=bind9dns-net --ip=10.10.0.4 --dns=10.10.0.2 ubuntu:bionic /bin/bash -c "while :; do sleep 10; done"
The image we are using is missing ping and dns tools, so use the commands below to install them:
apt install iputils-ping
apt install dnsutils
Use the host1 and host2 containers to test DNS settings by attaching to the container:
docker exec -it host1 bash
From a host we can test the following command to validate the DNS settings:
host -l astra.datastax.com
dig IP
dig hostname
And we can validate the settings of a host machine via /etc/nsswitch.com file
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