Ubuntu 14.04
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OpenStack Liberty : Cinder Storage(NFS)
2015/12/28
 
It's possible to use Virtual Storages provided by Cinder if an Instance needs more disks.
Configure Virtual storage with NFS backend on here.
                                      +------------------+
                             10.0.0.50| [ 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]
NFS server is required to be running on your LAN, refer to here.
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

root@storage:~#
vi /etc/cinder/cinder.conf
# add follows in the [DEFAULT] section

enabled_backends = nfs
# add follows to the end

[nfs]
volume_driver = cinder.volume.drivers.nfs.NfsDriver
nfs_shares_config = /etc/cinder/nfs_shares
nfs_mount_point_base = $state_path/mnt
root@storage:~#
vi /etc/cinder/nfs_shares
# create new : specify NFS shared directory

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

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

root@storage:~#
initctl restart cinder-volume

[3] Change Nova settings to mount 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
root@node01:~#
vi /etc/nova/nova.conf
# add follows in the [DEFAULT] section

osapi_volume_listen = 0.0.0.0
volume_api_class = nova.volume.cinder.API
[root@node01 ~]#
initctl restart nova-compute

[4] For example, create a virtual disk "disk01" with 10GB. It's OK to work on any node. (This example is on Control Node)
# set environment variable first

root@dlp ~(keystone)#
echo "export OS_VOLUME_API_VERSION=2" >> ~/keystonerc

root@dlp ~(keystone)#
source ~/keystonerc
root@dlp ~(keystone)#
cinder create --display_name disk01 10

+---------------------------------------+--------------------------------------+
|                Property               |                Value                 |
+---------------------------------------+--------------------------------------+
|              attachments              |                  []                  |
|           availability_zone           |                 nova                 |
|                bootable               |                false                 |
|          consistencygroup_id          |                 None                 |
|               created_at              |      2016-01-02T06:57:23.000000      |
|              description              |                 None                 |
|               encrypted               |                False                 |
|                   id                  | cf725960-ddb1-4849-b062-db73a11d9fbc |
|                metadata               |                  {}                  |
|            migration_status           |                 None                 |
|              multiattach              |                False                 |
|                  name                 |                disk01                |
|         os-vol-host-attr:host         | network.srv.world@nfs#Generic_NFS |
|     os-vol-mig-status-attr:migstat    |                 None                 |
|     os-vol-mig-status-attr:name_id    |                 None                 |
|      os-vol-tenant-attr:tenant_id     |   fa7d34414b8c45c4a2fdc29403fb5cd2   |
|   os-volume-replication:driver_data   |                 None                 |
| os-volume-replication:extended_status |                 None                 |
|           replication_status          |               disabled               |
|                  size                 |                  10                  |
|              snapshot_id              |                 None                 |
|              source_volid             |                 None                 |
|                 status                |               creating               |
|                user_id                |   5efb3edfd2f347eea6258068a06cb9f1   |
|              volume_type              |                 None                 |
+---------------------------------------+--------------------------------------+

root@dlp ~(keystone)#
cinder list

+--------------------------------------+-----------+------------------+--------+------+-------------+----------+-------------+-------------+
|                  ID                  |   Status  | Migration Status |  Name  | Size | Volume Type | Bootable | Multiattach | Attached to |
+--------------------------------------+-----------+------------------+--------+------+-------------+----------+-------------+-------------+
| cf725960-ddb1-4849-b062-db73a11d9fbc | available |        -         | disk01 |  10  |      -      |  false   |    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                          |
+-----------+-------------+---------+------------+-------------+-----------------------------------+
| a25ba5e7- | Ubuntu_1404 | SHUTOFF | -          | Shutdown    | int_net=192.168.100.3, 10.0.0.201 |
+-----------+-------------+---------+------------+-------------+-----------------------------------+

root@dlp ~(keystone)#
nova volume-attach Ubuntu_1404 cf725960-ddb1-4849-b062-db73a11d9fbc auto

+----------+--------------------------------------+
| Property | Value                                |
+----------+--------------------------------------+
| device   | /dev/vdb                             |
| id       | cf725960-ddb1-4849-b062-db73a11d9fbc |
| serverId | a25ba5e7-d01d-45ab-8484-f61315fa6648 |
| volumeId | cf725960-ddb1-4849-b062-db73a11d9fbc |
+----------+--------------------------------------+

# the status of attached disk turns "in-use" like follows

root@dlp ~(keystone)#
cinder list

+-----------+--------+------------------+--------+------+-------------+----------+-------------+----------------+
| ID        | Status | Migration Status |  Name  | Size | Volume Type | Bootable | Multiattach | Attached to    |
+-----------+--------+------------------+--------+------+-------------+----------+-------------+----------------+
| cf725960- | in-use |        -         | disk01 |  10  |      -      |  false   |    False    | a25ba5e7-d01d- |
+-----------+--------+------------------+--------+------+-------------+----------+-------------+----------------+
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