Ubuntu 22.04
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OpenStack Bobcat : Use Cinder Storage (NFS)2023/10/06

 
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
+-----------+-----------+  +-----------+-----------+  +-----------+-----------+
|   [ dlp.srv.world ]   |  | [ network.srv.world ] |  |  [ node01.srv.world ] |
|     (Control Node)    |  |     (Network Node)    |  |     (Compute Node)    |
|                       |  |                       |  |                       |
|  MariaDB    RabbitMQ  |  |      Open vSwitch     |  |        Libvirt        |
|  Memcached  Nginx     |  |     Neutron Server    |  |      Nova Compute     |
|  Keystone   httpd     |  |      OVN-Northd       |  |      Open vSwitch     |
|  Glance     Nova API  |  |  Nginx  iSCSI Target  |  |   OVN Metadata Agent  |
|  Cinder API           |  |     Cinder Volume     |  |     OVN-Controller    |
+-----------------------+  +-----------------------+  +-----------------------+

-----------+-------------------------------------------------------------------
       eth0|10.0.0.35
+----------+-----------+
|   [ nfs.srv.world ]  |
|       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@network:~#
apt -y install nfs-common
root@network:~#
vi /etc/idmapd.conf
# line 5 : uncomment and change to your domain name

Domain =
srv.world
root@network:~#
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@network:~#
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@network:~#
chmod 640 /etc/cinder/nfs_shares

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

root@network:~#
systemctl restart cinder-volume

root@network:~#
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 5 : uncomment and change to your domain name

Domain =
srv.world
root@node01:~#
vi /etc/nova/nova.conf
# add follows into the [keystone_authtoken] section
[keystone_authtoken]
.....
.....
service_token_roles = service
service_token_roles_required = true

# add to the end
[service_user]
send_service_user_token = true
auth_url = https://dlp.srv.world:5000
auth_type = password
project_domain_name = default
user_domain_name = default
project_name = service
username = nova
password = servicepassword
insecure = false

[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          | 2023-10-06T01:39:03.743415           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | b9138abb-1e44-470b-9607-49e6a7bc765b |
| 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             | 470c9323dad64bbea8fb5ecca6381f72     |
+---------------------+--------------------------------------+

ubuntu@dlp ~(keystone)$
openstack volume list

+--------------------------------------+--------+-----------+------+-------------+
| ID                                   | Name   | Status    | Size | Attached to |
+--------------------------------------+--------+-----------+------+-------------+
| b9138abb-1e44-470b-9607-49e6a7bc765b | disk01 | available |   10 |             |
+--------------------------------------+--------+-----------+------+-------------+
[5] Attach the virtual disk to an Instance.
For the example 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    |
+--------------------------------------+-------------+---------+------------------------------------+------------+-----------+
| 530698ed-413e-4bda-b02e-8f6f60380bd1 | Ubuntu-2204 | SHUTOFF | private=10.0.0.222, 192.168.100.79 | Ubuntu2204 | m1.medium |
+--------------------------------------+-------------+---------+------------------------------------+------------+-----------+

ubuntu@dlp ~(keystone)$
openstack server add volume Ubuntu-2204 disk01

+-----------------------+--------------------------------------+
| Field                 | Value                                |
+-----------------------+--------------------------------------+
| ID                    | b9138abb-1e44-470b-9607-49e6a7bc765b |
| Server ID             | 530698ed-413e-4bda-b02e-8f6f60380bd1 |
| Volume ID             | b9138abb-1e44-470b-9607-49e6a7bc765b |
| Device                | /dev/vdb                             |
| Tag                   | None                                 |
| Delete On Termination | False                                |
+-----------------------+--------------------------------------+

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

ubuntu@dlp ~(keystone)$
openstack volume list

+--------------------------------------+--------+--------+------+--------------------------------------+
| ID                                   | Name   | Status | Size | Attached to                          |
+--------------------------------------+--------+--------+------+--------------------------------------+
| b9138abb-1e44-470b-9607-49e6a7bc765b | disk01 | in-use |   10 | Attached to Ubuntu-2204 on /dev/vdb  |
+--------------------------------------+--------+--------+------+--------------------------------------+

# detach the disk

ubuntu@dlp ~(keystone)$
openstack server remove volume Ubuntu-2204 disk01

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