Ubuntu 16.04
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OpenStack Pike : Use Cinder Storage (NFS)
2017/09/17
 
It's possible to use Virtual Storages provided by Cinder if an Instance needs more disks.
Configure Virtual storage with NFS backend on here. 
------------+---------------------------+---------------------------+-------------------------+------------
            |                           |                           |                         |
        eth0|10.0.0.30              eth0|10.0.0.50              eth0|10.0.0.51            eth0|10.0.0.35
+-----------+-----------+   +-----------+-----------+   +-----------+-----------+  +----------+-----------+
|    [ Control Node ]   |   |    [ Storage Node ]   |   |    [ Compute Node ]   |  |   [  NFS Server  ]   |
|                       |   |                       |   |                       |  |                      |
|  MariaDB    RabbitMQ  |   |                       |   |        Libvirt        |  +----------------------+
|  Memcached  httpd     |   |        L2 Agent       |   |     Nova Compute      |
|  Keystone   Glance    |   |        L3 Agent       |   |        L2 Agent       |
|  Nova API             |   |     Metadata Agent    |   |                       |
|  Neutron Server       |   |     Cinder-Volume     |   |                       |
|  Metadata Agent       |   |                       |   |                       |
|  Cinder API           |   |                       |   |                       |
+-----------------------+   +-----------------------+   +-----------------------+
[1]
NFS server is required to be running on your LAN, refer to here.
On this example, configure [/var/lib/nfs-share] 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 the value for enabled_backends

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:/var/lib/nfs-share
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 on Compute Node 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          | 2017-09-20T07:15:52.683634           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | aeb65261-4183-4d5d-a4f3-118d4fe65049 |
| migration_status    | None                                 |
| multiattach         | False                                |
| name                | disk01                               |
| properties          |                                      |
| replication_status  | None                                 |
| size                | 10                                   |
| snapshot_id         | None                                 |
| source_volid        | None                                 |
| status              | creating                             |
| type                | None                                 |
| updated_at          | None                                 |
| user_id             | 71b407652ab4433a801915ab21018ffd     |
+---------------------+--------------------------------------+
root@dlp ~(keystone)#
openstack volume list 

+--------------------------------------+--------+-----------+------+-------------+
| ID                                   | Name   | Status    | Size | Attached to |
+--------------------------------------+--------+-----------+------+-------------+
| aeb65261-4183-4d5d-a4f3-118d4fe65049 | disk01 | available |   10 |             |
+--------------------------------------+--------+-----------+------+-------------+
[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      | Flavor   |
+-----------+-------------+---------+------------------------------------+------------+----------+
| f5ae3046- | Ubuntu_1604 | SHUTOFF | int_net=192.168.100.10, 10.0.0.210 | Ubuntu1604 | m1.small |
+-----------+-------------+---------+------------------------------------+------------+----------+
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        | Name   | Status | Size | Attached to                          |
+-----------+--------+--------+------+--------------------------------------+
| aeb65261- | disk01 | in-use |   10 | Attached to Ubuntu_1604 on /dev/vdb  |
+-----------+--------+--------+------+--------------------------------------+
# for detaching the disk, run like follows

root@dlp ~(keystone)#
openstack server remove volume Ubuntu_1604 disk01

 
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