Steps to build plug many locomotives into one mongo

gistfile1.txt

 docker run -d --name mongodb dockerfile/mongodb mongod --noprealloc --smallfiles --rest --httpinterface

# use nsenter to enter it and find it's ip using 'ip addr'

### For future notes
### docker run -p 127.0.0.01:804:80 --link=mongodb:27017 --link=mongodb:28017 -d -e MONGODB_PORT_27017_TCP_ADDR="172.17.0.2" metakungfu/locomotive-cms

docker run -p 127.0.0.01:801:80 --link=mongodb:27017 --link=mongodb:28017 -d metakungfu/locomotive-cms
docker run -p 127.0.0.01:802:80 --link=mongodb:27017 --link=mongodb:28017 -d metakungfu/locomotive-cms
docker run -p 127.0.0.01:803:80 --link=mongodb:27017 --link=mongodb:28017 -d metakungfu/locomotive-cms

# Enter each one:

apt-get install -y vim

# Edit each file

vim /opt/locomotive_cms/app/config/mongoid.yml

# Make sure the database names are always unique and then change the ip of each database server to the ip noted above
# Then use haproxy to do name based reverse proxy rules and you are all set.