On a Openstack controller node configured with pure IPv6, the glance client throws up:

Error finding address for XX [Errno -2] Name or service not known

for commands like "glance image-list"

The reason for this is - that the glance client tries to form a IPv4 socket even if the hostname resolves to a IPv6 address.

The fix can be made in the glanceclient/ common/ http.py inside the connect() method.