Docker - haproxy-confd-etcd

• http://ox86.tumblr.com/post/90554410668/easy-scaling-with-docker-haproxy-and-confd

Build docker from dockerfile

docker build -t ouruser/sinatra:v2 .

• https://docs.docker.com/userguide/dockerimages/

Nginx as frontend to unicorn

Tweaks to make nginx faster

• http://vstark.net/2012/10/21/nginx-unicorn-performance-tweaks/