CentOS 7
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OpenStack Newton : Cinder Storage (NFS)
2016/10/26
 
It's possible to use Virtual Storages provided by Cinder if an Instance needs more disks.
Configure Virtual storage with NFS backend on here. 
                                      +------------------+
                             10.0.0.50| [ Storage Node ] |
+------------------+            +-----+   Cinder-Volume  |
| [ Control Node ] |            | eth0|                  |           +--------------+
|     Keystone     |10.0.0.30   |     +------------------+  10.0.0.40|              |
|      Glance      |------------+------------------------------------+  NFS Server  |
|     Nova API     |eth0        |     +------------------+       eth0|              |
|    Cinder API    |            | eth0| [ Compute Node ] |           +--------------+
+------------------+            +-----+   Nova Compute   |
                             10.0.0.51|                  |
                                      +------------------+
[1]
NFS server is required to be running on your LAN, refer to here.
On this example, configure "/storage" 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:/storage
[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 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 follows in the end

[cinder]
os_region_name = RegionOne
[root@node01 ~]#
systemctl restart openstack-nova-compute

[4] 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

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

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

+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| attachments         | []                                   |
| availability_zone   | nova                                 |
| bootable            | false                                |
| consistencygroup_id | None                                 |
| created_at          | 2016-10-27T02:21:08.061864           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | ab1bfb76-0e0b-4e09-90f2-5f4becee31bd |
| migration_status    | None                                 |
| multiattach         | False                                |
| name                | disk01                               |
| properties          |                                      |
| replication_status  | disabled                             |
| size                | 10                                   |
| snapshot_id         | None                                 |
| source_volid        | None                                 |
| status              | creating                             |
| type                | None                                 |
| updated_at          | None                                 |
| user_id             | 0a28ee66b05f4c7b9709f316c5109e0a     |
+---------------------+--------------------------------------+
[root@dlp ~(keystone)]#
openstack volume list 

+--------------------------------------+--------------+-----------+------+-------------+
| ID                                   | Display Name | Status    | Size | Attached to |
+--------------------------------------+--------------+-----------+------+-------------+
| ab1bfb76-0e0b-4e09-90f2-5f4becee31bd | 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.
[root@dlp ~(keystone)]#
openstack server list 

+-----------+----------+---------+------------------------------------+------------+
| ID        | Name     | Status  | Networks                           | Image Name |
+-----------+----------+---------+------------------------------------+------------+
| e5a31503- | CentOS_7 | SHUTOFF | int_net=192.168.100.11, 10.0.0.200 | CentOS7    |
+-----------+----------+---------+------------------------------------+------------+
[root@dlp ~(keystone)]#
openstack server add volume CentOS_7 disk01
# the status of attached disk turns "in-use" like follows

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

+--------------------------------------+--------------+--------+------+-----------------------------------+
| ID                                   | Display Name | Status | Size | Attached to                       |
+--------------------------------------+--------------+--------+------+-----------------------------------+
| ab1bfb76-0e0b-4e09-90f2-5f4becee31bd | disk01       | in-use |   10 | Attached to CentOS_7 on /dev/vdb  |
+--------------------------------------+--------------+--------+------+-----------------------------------+
 
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