Dockerfile for DDCLIENT

This is a simple Dockerfile to build a container with ddclient pre-nstalled and configured to use with the FreeDNS Dynamic DNS service.

docker build . -t alpine/ddclient --build-arg DD_USERNAME='' --build-arg DD_PASSWORD='' --build-arg DD_DOMAINNAME=''
docker run -d --name ddclient --restart=unless-stopped alpine/ddclient