I was in meetings all day and used that time to learn a little about Docker Networks.

DockerNetworkHack.sh

#
# Learn About Docker Networks
# github/tripdubroot
#     Docker version 1.12.0-rc2
#     build 906eacd
#     experimental
#
# https://docs.docker.com/engine/userguide/networking/dockernetworks/#docker-embedded-dns-server
# https://docs.docker.com/engine/userguide/networking/configure-dns/
# https://github.com/docker/libnetwork/blob/ed311d050fda7821f2e7c53a7e08a0205923aef5/resolver.go

# Create a docker network to join containers to
docker network create tdrnet

# List all docker networks available
docker network ls

# List specific attributes about the network we created
docker network inspect tdrnet

# Create an Ubuntu container and join user-created network
docker run -itd --name tdrone --net=tdrnet ubuntu

# Create another ubuntu container and join the user-defined network
docker run -itd --name tdrtwo --net=tdrnet ubuntu

# List containers
docker ps

# List attributes of network, notice new endpoints created
docker network inspect tdrnet

# Enter the container to run commands:
docker attach tdrone

# Container Command: update cache and install network tools
apt-get update && apt-get install -y net-tools iputils-ping

# Container Command: look at eth settings
ifconfig

# Container Command: look at ip setting
cat /etc/hosts

# Container Command: look at nameserver setting
cat /etc/resolv.conf

# Container Command: ping other container by name
ping -c 4 tdrtwo

# Container Command: Exit container while leaving it running
(Ctrl + p + q)

# Stop running containes and remove
docker stop $(docker ps -q); docker rm $(docker ps -aq)

# Remove network
docker network rm tdrnet