Ubuntu 16.04
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OpenStack Pike : Use Cinder Storage (Multi-BackEnds)
2017/09/17
 
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            eth0|10.0.0.35
+-----------+-----------+   +-----------+-----------+   +-----------+-----------+  +----------+-----------+
|    [ Control Node ]   |   |    [ Storage Node ]   |   |    [ Compute Node ]   |  |   [  NFS Server  ]   |
|                       |   |                       |   |                       |  |                      |
|  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           |   |                       |   |                       |
+-----------------------+   +-----------------------+   +-----------------------+

[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-get -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 follows in the [DEFAULT] section

enabled_backends = lvm,nfs

# add follows to the end
[lvm]
iscsi_helper = lioadm
# vlume group name
volume_group = vg_volume01
# IP address of Storage Node
iscsi_ip_address = 10.0.0.50
volume_driver = cinder.volume.drivers.lvm.LVMVolumeDriver
volumes_dir = $state_path/volumes
iscsi_protocol = iscsi

[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-get -y install nfs-common
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 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=2" >> ~/keystonerc

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

+-------------+--------------------------------------+
| Field       | Value                                |
+-------------+--------------------------------------+
| description | None                                 |
| id          | 9f4be8a5-b60b-4247-9328-4bb179d410c0 |
| is_public   | True                                 |
| name        | lvm                                  |
+-------------+--------------------------------------+

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

+-------------+--------------------------------------+
| Field       | Value                                |
+-------------+--------------------------------------+
| description | None                                 |
| id          | 7042b9b1-d664-480b-8021-bb80e941959d |
| is_public   | True                                 |
| name        | nfs                                  |
+-------------+--------------------------------------+

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

+--------------------------------------+------+-----------+
| ID                                   | Name | Is Public |
+--------------------------------------+------+-----------+
| 7042b9b1-d664-480b-8021-bb80e941959d | nfs  | True      |
| 9f4be8a5-b60b-4247-9328-4bb179d410c0 | lvm  | True      |
+--------------------------------------+------+-----------+
[6] Create volumes with specifying volume types.
root@dlp ~(keystone)#
openstack volume create --type lvm --size 10 disk_lvm

+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| attachments         | []                                   |
| availability_zone   | nova                                 |
| bootable            | false                                |
| consistencygroup_id | None                                 |
| created_at          | 2017-09-20T07:22:33.133942           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | b6189f07-ddfa-4b88-97a5-aa3988d16ab2 |
| migration_status    | None                                 |
| 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             | 71b407652ab4433a801915ab21018ffd     |
+---------------------+--------------------------------------+

root@dlp ~(keystone)#
openstack volume create --type nfs --size 10 disk_nfs

+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| attachments         | []                                   |
| availability_zone   | nova                                 |
| bootable            | false                                |
| consistencygroup_id | None                                 |
| created_at          | 2017-09-20T07:22:49.460844           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | a2ef75ef-6b1b-4962-998c-e3d81be34f2a |
| migration_status    | None                                 |
| 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             | 71b407652ab4433a801915ab21018ffd     |
+---------------------+--------------------------------------+

root@dlp ~(keystone)#
openstack volume list

+--------------------------------------+----------+-----------+------+-------------+
| ID                                   | Name     | Status    | Size | Attached to |
+--------------------------------------+----------+-----------+------+-------------+
| a2ef75ef-6b1b-4962-998c-e3d81be34f2a | disk_nfs | available |   10 |             |
| b6189f07-ddfa-4b88-97a5-aa3988d16ab2 | disk_lvm | available |   10 |             |
+--------------------------------------+----------+-----------+------+-------------+
[7] Attache volume to an instance.
root@dlp ~(keystone)#
openstack server list

+-----------+-------------+---------+------------------------------------+------------+----------+
| ID        | Name        | Status  | Networks                           | Image      | Flavor   |
+-----------+-------------+---------+------------------------------------+------------+----------+
| f5ae3046- | Ubuntu_1604 | SHUTOFF | int_net=192.168.100.10, 10.0.0.210 | Ubuntu1604 | m1.small |
+-----------+-------------+---------+------------------------------------+------------+----------+

root@dlp ~(keystone)#
openstack server add volume Ubuntu_1604 disk_lvm

root@dlp ~(keystone)#
openstack server add volume Ubuntu_1604 disk_nfs
# the status of attached disk turns [in-use] like follows

root@dlp ~(keystone)#
openstack volume list

+--------------------------------------+----------+--------+------+--------------------------------------+
| ID                                   | Name     | Status | Size | Attached to                          |
+--------------------------------------+----------+--------+------+--------------------------------------+
| a2ef75ef-6b1b-4962-998c-e3d81be34f2a | disk_nfs | in-use |   10 | Attached to Ubuntu_1604 on /dev/vdc  |
| b6189f07-ddfa-4b88-97a5-aa3988d16ab2 | disk_lvm | in-use |   10 | Attached to Ubuntu_1604 on /dev/vdb  |
+--------------------------------------+----------+--------+------+--------------------------------------+

# for detaching the disk,run like follows

root@dlp ~(keystone)#
openstack server remove volume Ubuntu_1604 disk_lvm

root@dlp ~(keystone)#
openstack server remove volume Ubuntu_1604 disk_nfs

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