Ubuntu 20.04
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OpenStack Yoga : Use Cinder Storage (LVM)
2022/04/06
 
It's possible to use Virtual Storages provided by Cinder if an Instance needs more disks.
Configure Virtual storage with LVM backend on here.
It needs there are some free spaces on disks of Storage Node.
------------+---------------------------+---------------------------+------------
            |                           |                           |
        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           |   |     iSCSI Target      |   |     OVN-Controller    |
+-----------------------+   +-----------------------+   +-----------------------+

[1] Create a volume group for Cinder on Storage Node.
root@storage:~#
pvcreate /dev/sdb1

Physical volume "/dev/sdb1" successfully created
root@storage:~#
vgcreate -s 32M vg_volume01 /dev/sdb1

Volume group "vg_volume01" successfully created
[2] Configure Cinder Volume on Storage Node.
root@storage:~#
apt -y install targetcli-fb python3-rtslib-fb
root@storage:~#
vi /etc/cinder/cinder.conf
# add the value to [enabled_backends] param

enabled_backends =
lvm
# add to the end

[lvm]
target_helper = lioadm
target_protocol = iscsi
# IP address of Storage Node
target_ip_address = 10.0.0.50
# volume group name created on [1]
volume_group = vg_volume01
volume_driver = cinder.volume.drivers.lvm.LVMVolumeDriver
volumes_dir = $state_path/volumes

root@storage:~#
systemctl restart cinder-volume
[3] Configure Nova on Compute Node.
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          | 2022-04-06T02:27:35.932718           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | e778b0e9-976c-475b-a256-e015e4051bda |
| 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             | 95f196a1851c4b93b016871f7d5ded82     |
+---------------------+--------------------------------------+

ubuntu@dlp ~(keystone)$
openstack volume list

+--------------------------------------+--------+-----------+------+-------------+
| ID                                   | Name   | Status    | Size | Attached to |
+--------------------------------------+--------+-----------+------+-------------+
| e778b0e9-976c-475b-a256-e015e4051bda | 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   |
+--------------------------------------+-------------+---------+------------------------------------+------------+----------+
| 7ea894ee-3a91-4541-96ba-717ff45917c5 | Ubuntu-2004 | SHUTOFF | private=10.0.0.230, 192.168.100.12 | Ubuntu2004 | m1.small |
+--------------------------------------+-------------+---------+------------------------------------+------------+----------+

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

+-----------+--------------------------------------+
| Field     | Value                                |
+-----------+--------------------------------------+
| ID        | e778b0e9-976c-475b-a256-e015e4051bda |
| Server ID | 7ea894ee-3a91-4541-96ba-717ff45917c5 |
| Volume ID | e778b0e9-976c-475b-a256-e015e4051bda |
| Device    | /dev/vdb                             |
+-----------+--------------------------------------+

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

ubuntu@dlp ~(keystone)$
openstack volume list

+--------------------------------------+--------+--------+------+--------------------------------------+
| ID                                   | Name   | Status | Size | Attached to                          |
+--------------------------------------+--------+--------+------+--------------------------------------+
| e778b0e9-976c-475b-a256-e015e4051bda | 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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