CentOS 7
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OpenStack Queens : Cinder Storage (NFS)
2018/03/08
 
It's possible to use Virtual Storages provided by Cinder if an Instance needs more disks.
Configure Virtual storage with NFS 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  |   |      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           |   |                       |   |                       |
+-----------------------+   +-----------------------+   +-----------------------+
[1]
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.
[2] 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 ~]#
systemctl start rpcbind

[root@storage ~]#
systemctl enable rpcbind
[root@storage ~]#
vi /etc/cinder/cinder.conf
# add follows in the [DEFAULT] section

enabled_backends = nfs
# add follows to the end

[nfs]
volume_driver = cinder.volume.drivers.nfs.NfsDriver
nfs_shares_config = /etc/cinder/nfs_shares
nfs_mount_point_base = $state_path/mnt
[root@storage ~]#
vi /etc/cinder/nfs_shares
# create new : specify NFS shared directory

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

[3] Change Nova settings on Compute Node to mount NFS.
[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 ~]#
systemctl start rpcbind

[root@node01 ~]#
systemctl enable rpcbind
[root@node01 ~]#
vi /etc/nova/nova.conf
# add to the end

[cinder]
os_region_name = RegionOne
[root@node01 ~]#
systemctl restart openstack-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. (This example is on Control Node)
# set environment variable first

[cent@dlp ~(keystone)]$
echo "export OS_VOLUME_API_VERSION=2" >> ~/keystonerc

[cent@dlp ~(keystone)]$
source ~/keystonerc
[cent@dlp ~(keystone)]$
openstack volume create --size 10 disk01 

+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| attachments         | []                                   |
| availability_zone   | nova                                 |
| bootable            | false                                |
| consistencygroup_id | None                                 |
| created_at          | 2018-03-09T04:53:56.000000           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | a16b7761-1bd8-4d1b-975e-96071ff220c7 |
| multiattach         | False                                |
| name                | disk01                               |
| properties          |                                      |
| replication_status  | None                                 |
| size                | 10                                   |
| snapshot_id         | None                                 |
| source_volid        | None                                 |
| status              | creating                             |
| type                | None                                 |
| updated_at          | None                                 |
| user_id             | 3fc6c62eb5aa440aaa1eaf745faa35d6     |
+---------------------+--------------------------------------+
[cent@dlp ~(keystone)]$
openstack volume list 

+--------------------------------------+--------+-----------+------+-------------+
| ID                                   | Name   | Status    | Size | Attached to |
+--------------------------------------+--------+-----------+------+-------------+
| a16b7761-1bd8-4d1b-975e-96071ff220c7 | 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.
[cent@dlp ~(keystone)]$
openstack server list 

+-----------+----------+---------+-----------------------------------+---------+----------+
| ID        | Name     | Status  | Networks                          | Image   | Flavor   |
+-----------+----------+---------+-----------------------------------+---------+----------+
| f2da82e9- | CentOS_7 | SHUTOFF | int_net=192.168.100.8, 10.0.0.202 | CentOS7 | m1.small |
+-----------+----------+---------+-----------------------------------+---------+----------+
[cent@dlp ~(keystone)]$
openstack server add volume CentOS_7 disk01
# the status of attached disk turns [in-use] like follows

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

+--------------------------------------+--------+--------+------+-----------------------------------+
| ID                                   | Name   | Status | Size | Attached to                       |
+--------------------------------------+--------+--------+------+-----------------------------------+
| a16b7761-1bd8-4d1b-975e-96071ff220c7 | disk01 | in-use |   10 | Attached to CentOS_7 on /dev/vdb  |
+--------------------------------------+--------+--------+------+-----------------------------------+
# detach the disk

[cent@dlp ~(keystone)]$
openstack server remove volume CentOS_7 disk01

 
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