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OpenStack Yoga : Use Cinder Storage (Multi-BackEnds)
2022/06/01
 
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     |
+-----------+-----------+     +-----------+-----------+     +-----------+-----------+  |
|   [ dlp.srv.world ]   |     | [ network.srv.world ] |     |  [ node01.srv.world ] |  |
|     (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 API |     |     Cinder Volume     |     |   OVN Metadata Agent  |  |
|                       |     |                       |     |     OVN-Controller    |  |
+-----------------------+     +-----------------------+     +-----------------------+  |
                                                                                       |
-----------+---------------------------------------------------------------------------+
       eth0|10.0.0.35
+----------+-----------+
|   [ nfs.srv.world ]  |
|       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@network ~]#
dnf -y install nfs-utils
[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 follows in the [DEFAULT] section

enabled_backends = lvm,nfs

# add follows to the end
[lvm]
target_helper = lioadm
target_protocol = iscsi
target_ip_address = $my_ip
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@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 openstack-cinder-volume

[root@network ~]#
chown -R cinder. /var/lib/cinder/mnt_nfs

[4] Configure Compute Node.
[root@node01 ~]#
dnf -y install nfs-utils
[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 to the end

[cinder]
os_region_name = RegionOne
[root@node01 ~]#
systemctl restart openstack-nova-compute
# if SELinux is enabled, change policy like follows

[root@node01 ~]#
vi iscsiadm.te
# create new

module iscsiadm 1.0;

require {
        type iscsid_t;
        class capability dac_override;
}

#============= iscsid_t ==============
allow iscsid_t self:capability dac_override;

[root@node01 ~]#
checkmodule -m -M -o iscsiadm.mod iscsiadm.te

[root@node01 ~]#
semodule_package --outfile iscsiadm.pp --module iscsiadm.mod

[root@node01 ~]#
semodule -i iscsiadm.pp

[5] Create volume types. It's OK to work on any node. (This example 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          | 86655349-b3b9-46f7-b6f6-653230639b28 |
| is_public   | True                                 |
| name        | lvm                                  |
+-------------+--------------------------------------+

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

+-------------+--------------------------------------+
| Field       | Value                                |
+-------------+--------------------------------------+
| description | None                                 |
| id          | bba8b2a9-633d-41d7-8ea8-d3e43fc535d9 |
| is_public   | True                                 |
| name        | nfs                                  |
+-------------+--------------------------------------+

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

+--------------------------------------+-------------+-----------+
| ID                                   | Name        | Is Public |
+--------------------------------------+-------------+-----------+
| bba8b2a9-633d-41d7-8ea8-d3e43fc535d9 | nfs         | True      |
| 86655349-b3b9-46f7-b6f6-653230639b28 | lvm         | True      |
| 45566b0a-80af-4c39-b88f-9e8f7f410cc1 | __DEFAULT__ | True      |
+--------------------------------------+-------------+-----------+
[6] Login as a common user you'd like to add volumes to own instances.
[cent@dlp ~(keystone)]$
openstack volume create --type lvm --size 10 disk-lvm

+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| attachments         | []                                   |
| availability_zone   | nova                                 |
| bootable            | false                                |
| consistencygroup_id | None                                 |
| created_at          | 2022-06-01T02:31:40.735192           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | 70f982ec-0f43-4291-921e-2f830678c829 |
| 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             | ed0bc393ae81411fa1db0828e1d5e160     |
+---------------------+--------------------------------------+

[cent@dlp ~(keystone)]$
openstack volume create --type nfs --size 10 disk-nfs

+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| attachments         | []                                   |
| availability_zone   | nova                                 |
| bootable            | false                                |
| consistencygroup_id | None                                 |
| created_at          | 2022-06-01T02:32:00.647712           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | 8fc98493-3435-46c3-82d4-486171c3de0a |
| 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             | ed0bc393ae81411fa1db0828e1d5e160     |
+---------------------+--------------------------------------+

[cent@dlp ~(keystone)]$
openstack volume list

+--------------------------------------+----------+-----------+------+-------------+
| ID                                   | Name     | Status    | Size | Attached to |
+--------------------------------------+----------+-----------+------+-------------+
| 8fc98493-3435-46c3-82d4-486171c3de0a | disk-nfs | available |   10 |             |
| 70f982ec-0f43-4291-921e-2f830678c829 | disk-lvm | available |   10 |             |
+--------------------------------------+----------+-----------+------+-------------+
[7] Attache volume to an instance.
[cent@dlp ~(keystone)]$
openstack server list

+--------------------------------------+------------+---------+-------------------------------------+-----------------+----------+
| ID                                   | Name       | Status  | Networks                            | Image           | Flavor   |
+--------------------------------------+------------+---------+-------------------------------------+-----------------+----------+
| fa3a20c0-f0f4-46eb-b63f-69abba312d03 | CentOS-St8 | SHUTOFF | private=10.0.0.251, 192.168.100.140 | CentOS-Stream-8 | m1.small |
+--------------------------------------+------------+---------+-------------------------------------+-----------------+----------+

[cent@dlp ~(keystone)]$
openstack server add volume CentOS-St8 disk-lvm

[cent@dlp ~(keystone)]$
openstack server add volume CentOS-St8 disk-nfs
# the status of attached disk turns [in-use] like follows

[cent@dlp ~(keystone)]$
openstack volume list

+--------------------------------------+----------+--------+------+-------------------------------------+
| ID                                   | Name     | Status | Size | Attached to                         |
+--------------------------------------+----------+--------+------+-------------------------------------+
| 8fc98493-3435-46c3-82d4-486171c3de0a | disk-nfs | in-use |   10 | Attached to CentOS-St8 on /dev/vdc  |
| 70f982ec-0f43-4291-921e-2f830678c829 | disk-lvm | in-use |   10 | Attached to CentOS-St8 on /dev/vdb  |
+--------------------------------------+----------+--------+------+-------------------------------------+

# detach the disk

[cent@dlp ~(keystone)]$
openstack server remove volume CentOS-St8 disk-lvm

[cent@dlp ~(keystone)]$
openstack server remove volume CentOS-St8 disk-nfs

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