docker-nginx-load-balancer - is alpine-based container for proxy.
https://hub.docker.com/repository/docker/artefall/nginx-proxy
git clone https://github.com/Artefall/docker-nginx-load-balancer.git
cd docker-nginx-load-balancer
docker build -f Dockerfile --t nginx-proxy .
docker run -d -t -e PROXY_HOST_1=... -e PROXY_PATH_2= --name my-nginx-proxy nginx-proxy:latest
OR
You can download container from dockerhub