Confd is a lightweight configuration management tool, this is containerised version based on top of Alpine Linux with an incredibly tiny image size of 25 MB uncompressed.
All super simple, just run the container with /etc/confd
folders mounted as volumes, see build/ci/script/test.sh for a detailed example.
docker run \
--detach \
--name 'confd' \
--volume '/foo/bar/confd:/etc/confd' \
ianbytchek/confd