Ubuntu 14.04
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OpenStack Icehouse : Use Storage (NFS)
2014/05/30
 
It's possible to use the Virtual Storage provided by Cinder if an Instance needs more disks.
Configure Virtual storage with NFS on here. 
                                      +------------------+
                             10.0.0.35| [ Storage Node ] |
+------------------+            +-----+   Cinder-Volume  |
| [ Control Node ] |            | eth0|                  |           +--------------+
|     Keystone     |10.0.0.30   |     +------------------+  10.0.0.40|              |
|      Glance      |------------+------------------------------------+  NFS Server  |
|     Nova API     |eth0        |     +------------------+       eth0|              |
|    Cinder API    |            | eth0| [ Compute Node ] |           +--------------+
+------------------+            +-----+   Nova Compute   |
                             10.0.0.51|                  |
                                      +------------------+
[1]
Because of using NFS, NFS server is required to be running on your LAN.
On this example, configure "/storage" directory on "nfs.srv.world" as a shared directory.
[2] Configure Storage Node.
root@storage:~#
apt-get -y install nfs-common
root@storage:~#
vi /etc/idmapd.conf
# line 5: uncomment and change to the own domain name

Domain =
srv.world
root@storage:~#
initctl restart idmapd

idmapd start/running, process 2493
root@storage:~#
vi /etc/cinder/cinder.conf
# add follows in the [DEFAULT] section

volume_driver = cinder.volume.drivers.nfs.NfsDriver
nfs_shares_config = /etc/cinder/nfs_shares
nfs_mount_point_base = /var/lib/cinder/mnt
root@storage:~#
vi /etc/cinder/nfs_shares
# create new: specify NFS shared directories

nfs.srv.world:/storage
root@storage:~#
chmod 640 /etc/cinder/nfs_shares

root@storage:~#
chgrp cinder /etc/cinder/nfs_shares

root@storage:~#
mkdir /var/lib/cinder/mnt

root@storage:~#
chown cinder. /var/lib/cinder/mnt

root@storage:~#
service cinder-volume restart

cinder-volume stop/waiting
cinder-volume start/running, process 2538
[3] Change Nova settings to mount with NFS.
root@node01:~#
apt-get -y install nfs-common
root@node01:~#
vi /etc/idmapd.conf
# line 5: uncomment and change to the own domain name

Domain =
srv.world
root@node01:~#
initctl restart idmapd

idmapd start/running, process 3552
root@node01:~#
vi /etc/nova/nova.conf
# add follows in the [DEFAULT] section

volume_drivers="nfs=nova.virt.libvirt.volume.LibvirtNFSVolumeDriver"
root@node01:~#
service nova-compute restart

nova-compute stop/waiting
nova-compute start/running, process 7537
[4] For example, create a virtual disk "disk01" with 10GB. It's OK to work on any node. (This example is on Control Node)
[root@dlp ~(keystone)]#
cinder create --display_name disk01 10 

+---------------------+--------------------------------------+
|       Property      |                Value                 |
+---------------------+--------------------------------------+
|     attachments     |                  []                  |
|  availability_zone  |                 nova                 |
|       bootable      |                false                 |
|      created_at     |      2014-05-30T12:48:10.824170      |
| display_description |                 None                 |
|     display_name    |                disk01                |
|      encrypted      |                False                 |
|          id         | f39bc9bf-b060-474f-b34c-f0d6e7761792 |
|       metadata      |                  {}                  |
|         size        |                  10                  |
|     snapshot_id     |                 None                 |
|     source_volid    |                 None                 |
|        status       |               creating               |
|     volume_type     |                 None                 |
+---------------------+--------------------------------------+
[root@dlp ~(keystone)]#
cinder list 

+--------------------------------------+-----------+--------------+------+-------------+----------+-------------+
|                  ID                  |   Status  | Display Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+--------------+------+-------------+----------+-------------+
| f39bc9bf-b060-474f-b34c-f0d6e7761792 | available |    disk01    |  10  |     None    |  false   |             |
+--------------------------------------+-----------+--------------+------+-------------+----------+-------------+
[5] Attach the virtual disk to an Instance.
For the exmaple below, the disk is connected as "/dev/vdb". It's possible to use it as a storage to create a file system on it.
[root@dlp ~(keystone)]#
nova list 

+-----------+---------------+---------+------------+-------------+-----------------------+
| ID        | Name          | Status  | Task State | Power State | Networks              |
+-----------+---------------+---------+------------+-------------+-----------------------+
| 3a597327- | Ubuntu_Trusty | SHUTOFF | -          | Shutdown    | sharednet1=10.0.0.205 |
+-----------+---------------+---------+------------+-------------+-----------------------+
[root@dlp ~(keystone)]#
nova volume-attach Ubuntu_Trusty f39bc9bf-b060-474f-b34c-f0d6e7761792 auto 

+----------+--------------------------------------+
| Property | Value                                |
+----------+--------------------------------------+
| device   | /dev/vdb                             |
| id       | f39bc9bf-b060-474f-b34c-f0d6e7761792 |
| serverId | 3a597327-9122-468d-a2f5-def0145eab52 |
| volumeId | f39bc9bf-b060-474f-b34c-f0d6e7761792 |
+----------+--------------------------------------+
 
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