Simple coredns docker image for swarm

Very basic customisation of the base CoreDNS docker image.

Deploy in a swarm

docker stack deploy -c coredns-stack.yml coredns

Customise

Edit the Corefile to suit your needs, then alter the coredns-stack.yml file to use your own image. Eg, for a local build :

# coredns-stack.yml

...
  coredns:
    image: "my-amazing-coredns"

docker-compose -f coredns-stack.yml build
docker stack deploy -c coredns-stack.yml coredns