CentOS 7
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OpenStack Rocky : Cinder Storage (NFS)
2018/09/04
 
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    | 
+-----------+-----------+ +-----------+-----------+ +-----------+-----------+ |
|    [ 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]
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)
# 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
# work with any user from here

# set environment variable first

[cent@dlp ~(keystone)]$
echo "export OS_VOLUME_API_VERSION=3" >> ~/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          | 2018-09-04T01:38:42.000000           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | d7557d35-bc1f-4424-ba92-a78cb611518f |
| 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             | e2252ff04be3409e8e823a0a3a925cad     |
+---------------------+--------------------------------------+

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

+--------------------------------------+--------+-----------+------+-------------+
| ID                                   | Name   | Status    | Size | Attached to |
+--------------------------------------+--------+-----------+------+-------------+
| d7557d35-bc1f-4424-ba92-a78cb611518f | 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   |
+--------------------------------------+----------+---------+-----------------------------------+---------+----------+
| 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 disk01
# the status of attached disk turns [in-use] like follows

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

+--------------------------------------+--------+--------+------+-----------------------------------+
| ID                                   | Name   | Status | Size | Attached to                       |
+--------------------------------------+--------+--------+------+-----------------------------------+
| d7557d35-bc1f-4424-ba92-a78cb611518f | 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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