go-coredns-nomad

coredns with nomad plugin for service discovery. This repository will build a docker container with coredns and the nomad plugin.

Using the container

In order to run this container, and have service discovery work on port 1053, you need to pass in the following environment variables:

• NOMAD_ADDR - the address of the nomad server
• NOMAD_TOKEN - the token to use to query the nomad server
• NOMAD_TTL - the TTL for the DNS records, in seconds

For example:

docker run --name coredns-nomad --rm -p 1053:53 \
  --env NOMAD_ADDR=http://nomad:4646/ \
  --env NOMAD_TOKEN=XXXXXX \
  --env NOMAD_TTL=10 \
  ghcr.io/mutablelogic/coredns-nomad:v1.11.1

When you want to test it using dig, query <service>.<namespace>.nomad. For example,

dig +tcp -p 1053 @localhost service.default.nomad

Building the container

You can use the pre-built container from the GitHub Container Registry (for arm64 or amd64 on Linux), or you can build it yourself.

git clone git@github.com:mutablelogic/go-coredns-nomad.git
cd go-coredns-nomad
docker build \
  --tag ${REGISTRY}/${USERNAME}/coredns-nomad:v1.11.1 \
  --build-arg ARCH=$(arch) \
  --build-arg PLATFORM=$(uname -s | tr '[:upper:]' '[:lower:]') \
  --build-arg VERSION=v1.11.1 \
  -f etc/docker/Dockerfile .