CentOS 7
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OpenStack Rocky : Cinder Storage (Multi-BackEnds)
2018/09/04
 
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  | |      Open vSwitch     | |        Libvirt        | |
|  Memcached  httpd     | |        L2 Agent       | |     Nova Compute      | |
|  Keystone   Glance    | |        L3 Agent       | |      Open vSwitch     | |
|  Nova API             | |     Metadata Agent    | |        L2 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 ~]#
yum -y install nfs-utils
[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 follows in the [DEFAULT] section

enabled_backends = lvm,nfs

# add follows to the end
[lvm]
target_helper = lioadm
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 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 openstack-cinder-volume

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

[4] Configure Compute Node.
[root@node01 ~]#
yum -y install nfs-utils
[root@node01 ~]#
vi /etc/idmapd.conf
# line 5: 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 openstack-nova-compute

[5] Create volume types. It's OK to work on any node. (This example is on Control Node)
# first, with root priviledge, downgrade Cinder Client to Queens release version

# because it's impossible to run [Volume Create] with current version [python2-cinderclient-4.0.1]

[root@dlp ~(keystone)]#
rpm -q python2-cinderclient

python2-cinderclient-4.0.1-1.el7.noarch
[root@dlp ~(keystone)]#
curl -O http://ftp.jaist.ac.jp/pub/Linux/CentOS/7/cloud/x86_64/openstack-queens/python2-cinderclient-3.5.0-1.el7.noarch.rpm

[root@dlp ~(keystone)]#
rpm -Uvh --oldpackage python2-cinderclient-3.5.0-1.el7.noarch.rpm
# 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          | f0938eab-840c-4fa5-a07f-e743f9cfd71f |
| is_public   | True                                 |
| name        | lvm                                  |
+-------------+--------------------------------------+

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

+-------------+--------------------------------------+
| Field       | Value                                |
+-------------+--------------------------------------+
| description | None                                 |
| id          | 9f8fbe90-465e-4cd8-8277-d45582de4d67 |
| is_public   | True                                 |
| name        | nfs                                  |
+-------------+--------------------------------------+

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

+--------------------------------------+------+-----------+
| ID                                   | Name | Is Public |
+--------------------------------------+------+-----------+
| 9f8fbe90-465e-4cd8-8277-d45582de4d67 | nfs  | True      |
| f0938eab-840c-4fa5-a07f-e743f9cfd71f | lvm  | 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          | 2018-09-04T01:47:53.000000           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | de2133b4-63e2-483f-8c67-dbdda2a294ad |
| 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             | e2252ff04be3409e8e823a0a3a925cad     |
+---------------------+--------------------------------------+

[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          | 2018-09-04T01:48:10.000000           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | fa514009-7c5e-4a6e-81e1-442ec4547baf |
| 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             | e2252ff04be3409e8e823a0a3a925cad     |
+---------------------+--------------------------------------+

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

+--------------------------------------+----------+-----------+------+-------------+
| ID                                   | Name     | Status    | Size | Attached to |
+--------------------------------------+----------+-----------+------+-------------+
| fa514009-7c5e-4a6e-81e1-442ec4547baf | disk_nfs | available |   10 |             |
| de2133b4-63e2-483f-8c67-dbdda2a294ad | disk_lvm | available |   10 |             |
+--------------------------------------+----------+-----------+------+-------------+
[7] Attache volume to an instance.
[cent@dlp ~(keystone)]$
openstack server list

+--------------------------------------+----------+---------+-----------------------------------+---------+----------+
| ID                                   | Name     | Status  | Networks                          | Image   | Flavor   |
+--------------------------------------+----------+---------+-----------------------------------+---------+----------+
| 5b30f928-8834-4ab5-a5ce-760c48d4c9b7 | CentOS_7 | SHUTOFF | int_net=192.168.100.3, 10.0.0.220 | CentOS7 | m1.small |
+--------------------------------------+----------+---------+-----------------------------------+---------+----------+

[cent@dlp ~(keystone)]$
openstack server add volume CentOS_7 disk_lvm

[cent@dlp ~(keystone)]$
openstack server add volume CentOS_7 disk_nfs
# the status of attached disk turns [in-use] like follows

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

+--------------------------------------+----------+--------+------+-----------------------------------+
| ID                                   | Name     | Status | Size | Attached to                       |
+--------------------------------------+----------+--------+------+-----------------------------------+
| fa514009-7c5e-4a6e-81e1-442ec4547baf | disk_nfs | in-use |   10 | Attached to CentOS_7 on /dev/vdc  |
| de2133b4-63e2-483f-8c67-dbdda2a294ad | disk_lvm | in-use |   10 | Attached to CentOS_7 on /dev/vdb  |
+--------------------------------------+----------+--------+------+-----------------------------------+

# detach the disk

[cent@dlp ~(keystone)]$
openstack server remove volume CentOS_7 disk_lvm

[cent@dlp ~(keystone)]$
openstack server remove volume CentOS_7 disk_nfs

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