test Docker container type network between two containers

docker_container_type_network_test

#  Start a busybox container that just waits
$ docker run -d --name=justwait busybox sleep 3600

#  Start another container and connect is to the network on the first container
$ docker run -d --name=sharednettwo --net=container:justwait busybox sleep 3600

# Test that containers use the same  IP address as the first container 
# i.e. use the same networking namespace to both containers

$ docker exec -ti  justwait ifconfig
...
eth0      Link encap:Ethernet  HWaddr 02:42:AC:11:00:02
          inet addr:172.17.0.2  Bcast:0.0.0.0  Mask:255.255.0.0
...

$ docker exec -ti  sharednettwo ifconfig
...
eth0      Link encap:Ethernet  HWaddr 02:42:AC:11:00:02
          inet addr:172.17.0.2  Bcast:0.0.0.0  Mask:255.255.0.0
...