CentOS 7
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OpenStack Ocata : Cinder Storage (NFS)
2017/03/05
 
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,L3,Metadata Agent |  |      Nova Compute     |
 |  Keystone   Glance    |  |     Cinder-Volume     |  |      Open vSwitch     |
 |  Nova API             |  |                       |  |        L2 Agent       |
 |  Neutron Server       |  |                       |  |                       |
 |  Cinder API           |  |                       |  |                       |
 +-----------------------+  +-----------------------+  +-----------------------+

[1]
NFS server is required to be running on your LAN, refer to here.
On this example, configure [/var/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/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 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          | 2017-03-05T04:41:59.469153           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | 6c3ac37e-9fb3-46a3-8eed-7c5f3a36a607 |
| migration_status    | None                                 |
| 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             | cf3c5cbcdd214707b91d322a69af038e     |
+---------------------+--------------------------------------+

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

+--------------------------------------+--------------+-----------+------+-------------+
| ID                                   | Display Name | Status    | Size | Attached to |
+--------------------------------------+--------------+-----------+------+-------------+
| 6c3ac37e-9fb3-46a3-8eed-7c5f3a36a607 | 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 |
+-----------+----------+---------+-----------------------------------+------------+
| b17e0565- | CentOS_7 | SHUTOFF | int_net=192.168.100.5, 10.0.0.201 | 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                       |
+--------------------------------------+--------------+--------+------+-----------------------------------+
| 6c3ac37e-9fb3-46a3-8eed-7c5f3a36a607 | disk01       | in-use |   10 | Attached to CentOS_7 on /dev/vdb  |
+--------------------------------------+--------------+--------+------+-----------------------------------+

# detach the disk

[root@dlp ~(keystone)]#
openstack server remove volume CentOS_7 disk01

 
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