Debian 10 Buster
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OpenStack Rocky : Use Cinder Storage (Multi-Backend)2019/08/21

 
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 LAN, 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 the own domain name

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

enabled_backends = lvm,nfs

# add follows 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 just 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 directories

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 the own domain name

Domain =
srv.world
root@node01:~#
vi /etc/nova/nova.conf
# add follows 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. (This example is on Control Node)
# set environment variable first

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          | 53c99eef-4ad1-4706-9246-730d838ee67e |
| is_public   | True                                 |
| name        | lvm                                  |
+-------------+--------------------------------------+

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

+-------------+--------------------------------------+
| Field       | Value                                |
+-------------+--------------------------------------+
| description | None                                 |
| id          | a2b34f33-049a-46ab-8a65-569876049e66 |
| is_public   | True                                 |
| name        | nfs                                  |
+-------------+--------------------------------------+

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

+--------------------------------------+------+-----------+
| ID                                   | Name | Is Public |
+--------------------------------------+------+-----------+
| a2b34f33-049a-46ab-8a65-569876049e66 | nfs  | True      |
| 53c99eef-4ad1-4706-9246-730d838ee67e | lvm  | True      |
+--------------------------------------+------+-----------+
[6] Login as a common user you'd like to add volumes to own instances.
# set environment variable first

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

debian@dlp ~(keystone)$
source ~/keystonerc
debian@dlp ~(keystone)$
openstack volume create --type lvm --size 10 disk_lvm

+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| attachments         | []                                   |
| availability_zone   | nova                                 |
| bootable            | false                                |
| consistencygroup_id | None                                 |
| created_at          | 2019-08-21T02:54:32.000000           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | 54f21e8f-af6b-4676-ab55-69411da6a3b8 |
| 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             | 2af053ff367b47fc9e1a9139c29340b6     |
+---------------------+--------------------------------------+

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

+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| attachments         | []                                   |
| availability_zone   | nova                                 |
| bootable            | false                                |
| consistencygroup_id | None                                 |
| created_at          | 2019-08-21T02:54:48.000000           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | e073e628-8316-4fcb-a831-c6ca85ff2e36 |
| 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             | 2af053ff367b47fc9e1a9139c29340b6     |
+---------------------+--------------------------------------+

debian@dlp ~(keystone)$
openstack volume list

+--------------------------------------+----------+-----------+------+-------------+
| ID                                   | Name     | Status    | Size | Attached to |
+--------------------------------------+----------+-----------+------+-------------+
| e073e628-8316-4fcb-a831-c6ca85ff2e36 | disk_nfs | available |   10 |             |
| 54f21e8f-af6b-4676-ab55-69411da6a3b8 | disk_lvm | available |   10 |             |
+--------------------------------------+----------+-----------+------+-------------+
[7] Attache volume to an instance.
debian@dlp ~(keystone)$
openstack server list

+--------------------------------------+-----------+---------+------------------------------------+----------+----------+
| ID                                   | Name      | Status  | Networks                           | Image    | Flavor   |
+--------------------------------------+-----------+---------+------------------------------------+----------+----------+
| ca63556d-5adc-4183-a2de-476da9f71780 | Debian_10 | SHUTOFF | int_net=192.168.100.10, 10.0.0.219 | Debian10 | m1.small |
+--------------------------------------+-----------+---------+------------------------------------+----------+----------+

debian@dlp ~(keystone)$
openstack server add volume Debian_10 disk_lvm

debian@dlp ~(keystone)$
openstack server add volume Debian_10 disk_nfs
# the status of attached disk turns [in-use] like follows

debian@dlp ~(keystone)$
openstack volume list

+--------------------------------------+----------+--------+------+------------------------------------+
| ID                                   | Name     | Status | Size | Attached to                        |
+--------------------------------------+----------+--------+------+------------------------------------+
| e073e628-8316-4fcb-a831-c6ca85ff2e36 | disk_nfs | in-use |   10 | Attached to Debian_10 on /dev/vdc  |
| 54f21e8f-af6b-4676-ab55-69411da6a3b8 | disk_lvm | in-use |   10 | Attached to Debian_10 on /dev/vdb  |
+--------------------------------------+----------+--------+------+------------------------------------+

# for detaching the disk,run like follows

debian@dlp ~(keystone)$
openstack server remove volume Debian_10 disk_lvm

debian@dlp ~(keystone)$
openstack server remove volume Debian_10 disk_nfs

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