Ubuntu 20.04
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OpenStack Wallaby : Use Cinder Storage (NFS)2021/04/19

 
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  |   |      Open vSwitch     |   |        Libvirt        |
|  |  Memcached  httpd     |   |     Neutron Server    |   |     Nova Compute      |
|  |  Keystone   Glance    |   |       OVN-Northd      |   |      Open vSwitch     |
|  |  Nova API             |   |     Cinder Volume     |   |   OVN Metadata Agent  |
|  |  Cinder API           |   |                       |   |     OVN-Controller    |
|  +-----------------------+   +-----------------------+   +-----------------------+
|
+--------------+----------------------------------------------------------------------
           eth0|10.0.0.35
    +----------+-----------+
    |   [  NFS Server  ]   |
    |                      |
    +----------------------+

[1]
NFS server is required to be running on your local network, 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 your domain name

Domain =
srv.world
root@storage:~#
vi /etc/cinder/cinder.conf
# add the value to [enabled_backends] param

enabled_backends =
nfs
# add 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

# if set multiple share, write one per line

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 your 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. (example below is on Control Node)
# set environment variable

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          | 2021-04-19T05:27:48.200994           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | aba7b758-66b4-4e58-9a25-1a55b3c3736d |
| multiattach         | False                                |
| name                | disk01                               |
| properties          |                                      |
| replication_status  | None                                 |
| size                | 10                                   |
| snapshot_id         | None                                 |
| source_volid        | None                                 |
| status              | creating                             |
| type                | __DEFAULT__                          |
| updated_at          | None                                 |
| user_id             | 3ebb8ec1b4fc467da96379caef902df7     |
+---------------------+--------------------------------------+

ubuntu@dlp ~(keystone)$
openstack volume list

+--------------------------------------+--------+-----------+------+-------------+
| ID                                   | Name   | Status    | Size | Attached to |
+--------------------------------------+--------+-----------+------+-------------+
| aba7b758-66b4-4e58-9a25-1a55b3c3736d | 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   |
+--------------------------------------+-------------+---------+-------------------------------------+------------+----------+
| 675fa368-4534-4d38-bc14-319a90f09470 | Ubuntu-2004 | SHUTOFF | private=10.0.0.207, 192.168.100.169 | Ubuntu2004 | m1.small |
+--------------------------------------+-------------+---------+-------------------------------------+------------+----------+

ubuntu@dlp ~(keystone)$
openstack server add volume Ubuntu-2004 disk01
# the status of attached disk turns [in-use] like follows

ubuntu@dlp ~(keystone)$
openstack volume list

+--------------------------------------+--------+--------+------+--------------------------------------+
| ID                                   | Name   | Status | Size | Attached to                          |
+--------------------------------------+--------+--------+------+--------------------------------------+
| aba7b758-66b4-4e58-9a25-1a55b3c3736d | disk01 | in-use |   10 | Attached to Ubuntu-2004 on /dev/vdb  |
+--------------------------------------+--------+--------+------+--------------------------------------+

# detach the disk

ubuntu@dlp ~(keystone)$
openstack server remove volume Ubuntu-2004 disk01

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