Ubuntu 20.04
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OpenStack Victoria : Use Cinder Storage (Multi-BackEnds)
2020/10/20
 
It's possible to use Virtual Storages provided by Cinder if an Instance needs more disks.
Configure Virtual storage with LVM and NFS Multi-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]
For LVM backend on this example, use a volume group [vg_volume01] for it.
[2]
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.
[3] Configure Storage Node.
root@storage:~#
apt -y install nfs-common
root@storage:~#
vi /etc/idmapd.conf
# line 5: 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 = lvm,nfs

# add to the end
[lvm]
target_helper = tgtadm
target_protocol = iscsi
# IP address of Storage Node
target_ip_address = 10.0.0.50
volume_backend_name = LVM
# volume group name created
volume_group = vg_volume01
volume_driver = cinder.volume.drivers.lvm.LVMVolumeDriver
volumes_dir = $state_path/volumes

[nfs]
volume_driver = cinder.volume.drivers.nfs.NfsDriver
volume_backend_name = NFS
nfs_shares_config = /etc/cinder/nfs_shares
nfs_mount_point_base = $state_path/mnt_nfs 

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_nfs
[4] Configure Compute Node.
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

[5] Create volume types. It's OK to work on any node. (example below is on Control Node)
# set environment variable

root@dlp ~(keystone)#
echo "export OS_VOLUME_API_VERSION=3" >> ~/keystonerc

root@dlp ~(keystone)#
source ~/keystonerc
root@dlp ~(keystone)#
openstack volume type create lvm

+-------------+--------------------------------------+
| Field       | Value                                |
+-------------+--------------------------------------+
| description | None                                 |
| id          | 4fc707e3-816c-4f83-b603-699e8c08cb16 |
| is_public   | True                                 |
| name        | lvm                                  |
+-------------+--------------------------------------+

root@dlp ~(keystone)#
openstack volume type create nfs

+-------------+--------------------------------------+
| Field       | Value                                |
+-------------+--------------------------------------+
| description | None                                 |
| id          | 3625798b-49d7-4b39-a6e7-f6d9bb28def8 |
| is_public   | True                                 |
| name        | nfs                                  |
+-------------+--------------------------------------+

root@dlp ~(keystone)#
openstack volume type list

+--------------------------------------+-------------+-----------+
| ID                                   | Name        | Is Public |
+--------------------------------------+-------------+-----------+
| 3625798b-49d7-4b39-a6e7-f6d9bb28def8 | nfs         | True      |
| 4fc707e3-816c-4f83-b603-699e8c08cb16 | lvm         | True      |
| 7a33010a-65bc-42cc-8bb2-e4b24414e3d2 | __DEFAULT__ | True      |
+--------------------------------------+-------------+-----------+
[6] Login as a common user you'd like to add volumes to own instances.
# 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 --type lvm --size 10 disk_lvm

+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| attachments         | []                                   |
| availability_zone   | nova                                 |
| bootable            | false                                |
| consistencygroup_id | None                                 |
| created_at          | 2020-10-20T06:07:12.000000           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | c9339f78-602e-485f-8034-dd0434e9f46b |
| multiattach         | False                                |
| name                | disk_lvm                             |
| properties          |                                      |
| replication_status  | None                                 |
| size                | 10                                   |
| snapshot_id         | None                                 |
| source_volid        | None                                 |
| status              | creating                             |
| type                | lvm                                  |
| updated_at          | None                                 |
| user_id             | a13cfae0e5eb466fae71a636a6ffb6b4     |
+---------------------+--------------------------------------+

ubuntu@dlp ~(keystone)$
openstack volume create --type nfs --size 10 disk_nfs

+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| attachments         | []                                   |
| availability_zone   | nova                                 |
| bootable            | false                                |
| consistencygroup_id | None                                 |
| created_at          | 2020-10-20T06:07:29.000000           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | 9aef6705-09b8-4637-a1b5-b741db7168ac |
| multiattach         | False                                |
| name                | disk_nfs                             |
| properties          |                                      |
| replication_status  | None                                 |
| size                | 10                                   |
| snapshot_id         | None                                 |
| source_volid        | None                                 |
| status              | creating                             |
| type                | nfs                                  |
| updated_at          | None                                 |
| user_id             | a13cfae0e5eb466fae71a636a6ffb6b4     |
+---------------------+--------------------------------------+

ubuntu@dlp ~(keystone)$
openstack volume list

+--------------------------------------+----------+-----------+------+-------------+
| ID                                   | Name     | Status    | Size | Attached to |
+--------------------------------------+----------+-----------+------+-------------+
| 9aef6705-09b8-4637-a1b5-b741db7168ac | disk_nfs | available |   10 |             |
| c9339f78-602e-485f-8034-dd0434e9f46b | disk_lvm | available |   10 |             |
+--------------------------------------+----------+-----------+------+-------------+
[7] Attache volume to an instance.
ubuntu@dlp ~(keystone)$
openstack server list

+--------------------------------------+-------------+---------+-------------------------------------+------------+----------+
| ID                                   | Name        | Status  | Networks                            | Image      | Flavor   |
+--------------------------------------+-------------+---------+-------------------------------------+------------+----------+
| 10abf4e3-d5d9-4b57-a5a0-7cb767442dcc | Ubuntu_2004 | SHUTOFF | private=192.168.100.188, 10.0.0.236 | Ubuntu2004 | m1.small |
+--------------------------------------+-------------+---------+-------------------------------------+------------+----------+

ubuntu@dlp ~(keystone)$
openstack server add volume Ubuntu_2004 disk_lvm

ubuntu@dlp ~(keystone)$
openstack server add volume Ubuntu_2004 disk_nfs
# the status of attached disk turns [in-use] like follows

ubuntu@dlp ~(keystone)$
openstack volume list

+--------------------------------------+----------+--------+------+--------------------------------------+
| ID                                   | Name     | Status | Size | Attached to                          |
+--------------------------------------+----------+--------+------+--------------------------------------+
| 9aef6705-09b8-4637-a1b5-b741db7168ac | disk_nfs | in-use |   10 | Attached to Ubuntu_2004 on /dev/vdc  |
| c9339f78-602e-485f-8034-dd0434e9f46b | disk_lvm | in-use |   10 | Attached to Ubuntu_2004 on /dev/vdb  |
+--------------------------------------+----------+--------+------+--------------------------------------+

# detach the disk

ubuntu@dlp ~(keystone)$
openstack server remove volume Ubuntu_2004 disk_lvm

ubuntu@dlp ~(keystone)$
openstack server remove volume Ubuntu_2004 disk_nfs

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