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Testing configuring Openstack completely with IPv6

Found that IP address parsing was thrown in a lot of cases because of
need to have '[]' encasing the address, or not for use with URLs and the
parsing of some user space 3rd party C binaries - iscsiadm for example.
All the others are best left by using a name set to the IPv6 address in
the /etc/hosts file, iSCSI though its not possible.

Got Cinder working by setting iscsi_ip_address (/etc/cinder/cinder.conf)
to '[$my_ip]' where my ip is an IPv6 address like 2001:db08::1 (not RFC
documentation address ?) and changing one line of python iin the nova
virt/libvirt/volume.py code:


--- nova/virt/libvirt/volume.py.orig    2015-04-27 23:00:00.208075644 +1200
+++ nova/virt/libvirt/volume.py 2015-04-27 22:38:08.938643636 +1200
@@ -833,7 +833,7 @@
     def _get_host_device(self, transport_properties):
         """Find device path in devtemfs."""
         device = ("ip-%s-iscsi-%s-lun-%s" %
-                  (transport_properties['target_portal'],
+                  (transport_properties['target_portal'].replace('[','').replace(']',''),
                    transport_properties['target_iqn'],
                    transport_properties.get('target_lun', 0)))
         if self._get_transport() == "default":

Nova-compute was looking for '/dev/disk/by-path/ip-[2001:db08::1]:3260
-iscsi-iqn.2010-10.org.openstack:*' when there were no '[]' in the udev
generated path....

This one can't be worked around by using the /etc/hosts file. iscsiadm
and tgt ned the IPv6 address wrapped in '[]', and iscsadm uses it in
output.  The above patch could be matched with a bi ihte cinder code
that puts '[]' around iscsi_ip_address if if it is not supplied.

More work is obvioulsy need on a convention for writing IPv6 addresses
in the Openstack configuration files, and there will be a lot of places
where code will need to be tweaked.

Lets start by fixing this blooper/lo hanging one  first though as it
makes it possible to get Cinder working in a pure IPv6 environment.
Above may be a bit of a hack, but only one one code path needs
adjustment...

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: cinder ipv6 iscsi
-- 
Cinder not working with IPv6 ISCSI
https://bugs.launchpad.net/bugs/1449492
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