Ubuntu 16.04
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OpenStack Newton : Use Cinder Storage (NFS)
2016/11/20
 
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 6: uncomment and change to the own domain name

Domain =
srv.world
root@storage:~#
vi /etc/cinder/cinder.conf
# add follows into 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:~#
systemctl restart cinder-volume

root@storage:~#
chown -R cinder. /var/lib/cinder/mnt
[3] Change Nova settings to mount NFS.
root@node01:~#
apt-get -y install nfs-common
root@node01:~#
vi /etc/idmapd.conf
# line 6: uncomment and change to the own domain name

Domain =
srv.world
root@node01:~#
vi /etc/nova/nova.conf
# add to the end

[cinder]
os_region_name = RegionOne
root@node01:~#
systemctl 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)#
openstack volume create --size 10 disk01

+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| attachments         | []                                   |
| availability_zone   | nova                                 |
| bootable            | false                                |
| consistencygroup_id | None                                 |
| created_at          | 2016-11-22T07:26:12.971342           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | b217fd54-74cb-43cd-99f3-ad554221a12f |
| migration_status    | None                                 |
| multiattach         | False                                |
| name                | disk01                               |
| properties          |                                      |
| replication_status  | disabled                             |
| size                | 10                                   |
| snapshot_id         | None                                 |
| source_volid        | None                                 |
| status              | creating                             |
| type                | None                                 |
| updated_at          | None                                 |
| user_id             | b48cbdf1975f4fd3987f83a100cc9162     |
+---------------------+--------------------------------------+

root@dlp ~(keystone)#
openstack volume list

+------------------------------+--------------+-----------+------+-------------+
| ID                           | Display Name | Status    | Size | Attached to |
+------------------------------+--------------+-----------+------+-------------+
| b217fd54-74cb-43cd-          | disk01       | available |   10 |             |
| 99f3-ad554221a12f            |              |           |      |             |
+------------------------------+--------------+-----------+------+-------------+
[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)#
openstack server list

+--------------------+-------------+---------+--------------------+------------+
| ID                 | Name        | Status  | Networks           | Image Name |
+--------------------+-------------+---------+--------------------+------------+
| 94afe31b-659b-4f61 | Ubuntu_1604 | SHUTOFF | int_net=192.168.10 | Ubuntu1604 |
| -bfd4-380bf440b510 |             |         | 0.9, 10.0.0.207    |            |
+--------------------+-------------+---------+--------------------+------------+

root@dlp ~(keystone)#
openstack server add volume Ubuntu_1604 disk01
# the status of attached disk turns "in-use" like follows

root@dlp ~(keystone)#
openstack volume list

+-----------------------+--------------+--------+------+-----------------------+
| ID                    | Display Name | Status | Size | Attached to           |
+-----------------------+--------------+--------+------+-----------------------+
| b217fd54-74cb-43cd-   | disk01       | in-use |   10 | Attached to           |
| 99f3-ad554221a12f     |              |        |      | Ubuntu_1604 on        |
|                       |              |        |      | /dev/vdb              |
+-----------------------+--------------+--------+------+-----------------------+
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