Ubuntu 18.04
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OpenStack Rocky : Use Cinder Storage (NFS)2018/09/18

 
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    |
+-----------+-----------+ +-----------+-----------+ +-----------+-----------+ |
|    [ Control Node ]   | |    [ Storage Node ]   | |    [ Compute Node ]   | |
|                       | |                       | |                       | |
|  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           | |                       | |                       | |
+-----------------------+ +-----------------------+ +-----------------------+ |
-----------+------------------------------------------------------------------+
       eth0|10.0.0.35
+----------+-----------+
|   [  NFS Server  ]   |
|                      |
+----------------------+

[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 -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 -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] Login as a common user you'd like to add volumes to own instances.
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

ubuntu@dlp ~(keystone)$
echo "export OS_VOLUME_API_VERSION=3" >> ~/keystonerc

ubuntu@dlp ~(keystone)$
source ~/keystonerc
ubuntu@dlp ~(keystone)$
openstack volume create --size 10 disk01

+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| attachments         | []                                   |
| availability_zone   | nova                                 |
| bootable            | false                                |
| consistencygroup_id | None                                 |
| created_at          | 2018-09-17T05:26:14.000000           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | 52c69701-c7e5-4b35-972f-24fda9804e6f |
| 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             | 54951d6863024516a19ed9bda53be12f     |
+---------------------+--------------------------------------+

ubuntu@dlp ~(keystone)$
openstack volume list

+--------------------------------------+--------+-----------+------+-------------+
| ID                                   | Name   | Status    | Size | Attached to |
+--------------------------------------+--------+-----------+------+-------------+
| 52c69701-c7e5-4b35-972f-24fda9804e6f | 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.
ubuntu@dlp ~(keystone)$
openstack server list

+--------------------------------------+-------------+---------+------------------------------------+------------+----------+
| ID                                   | Name        | Status  | Networks                           | Image      | Flavor   |
+--------------------------------------+-------------+---------+------------------------------------+------------+----------+
| e402a282-c5ae-4532-ad08-0a2f0d7803ac | Ubuntu_1804 | SHUTOFF | int_net=192.168.100.10, 10.0.0.214 | Ubuntu1804 | m1.small |
+--------------------------------------+-------------+---------+------------------------------------+------------+----------+

ubuntu@dlp ~(keystone)$
openstack server add volume Ubuntu_1804 disk01
# the status of attached disk turns [in-use] like follows

ubuntu@dlp ~(keystone)$
openstack volume list

+--------------------------------------+--------+--------+------+--------------------------------------+
| ID                                   | Name   | Status | Size | Attached to                          |
+--------------------------------------+--------+--------+------+--------------------------------------+
| 52c69701-c7e5-4b35-972f-24fda9804e6f | disk01 | in-use |   10 | Attached to Ubuntu_1804 on /dev/vdb  |
+--------------------------------------+--------+--------+------+--------------------------------------+

# detach the disk

ubuntu@dlp ~(keystone)$
openstack server remove volume Ubuntu_1804 disk01

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