check in this /etc/nova/nova.conf where you have to add this lines in Metadata

metadata_host = 10.10.100.51(your host ip)

metadata_listen = 0.0.0.0

metadata_listen_port = 8775

add this lines and save it

then do

nova-manage db sync

restart the nova services

cd /etc/init.d/; for i in $( ls nova-* ); do sudo service $i restart; done

After this u can ssh using the .pem key with your floating ip (external ip)

it works

Did you configure the security groups to allow ssh/ping?

I guess the image which they are downloading not working properly. Even i have followed the same document but in single node.

try to use this image:

http://archive.ubuntu.com/ubuntu/dists/precise/main/installer-amd64/current/images/netboot/mini.iso

clean all the instances which you have before.

After changing image, boot an instance with nic id. once your vm gets into active and got ip address, try follow below commands.

ip netns

this command will give the dhcp namespace. it will be something like this "qdhcp-34bea55d-9467-4943-a175-357d59a15f99"

ip netns exec dhcpnamespace_id ping 50.50.1.3

example

ip netns exec qdhcp-34bea55d-9467-4943-a175-357d59a15f99 ping 50.50.1.3

ip netns exec qdhcp-34bea55d-9467-4943-a175-357d59a15f99 ssh username@50.50.1.3

This should work.

sorry for my poor english.

Regards, BhavaniPrasad.