Ubuntu 16.04
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OpenStack Ocata : Use Cinder Storage (LVM)
2017/03/16
 
It's possible to use Virtual Storages provided by Cinder if an Instance needs more disks.
Configure Virtual storage with LVM backend on here.
It needs there are some free spaces on disks of Storage Node.
     ------------+--------------------------------+--------------------------------+------------
                 |                                |                                |
             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,L3,Metadata Agent |        |      Nova Compute     |
     |  Keystone   Glance    |        |     Cinder-Volume     |        |        L2 Agent       |
     |  Nova API             |        |     iSCSI Target      |        |                       |
     |  Neutron Server       |        |                       |        |                       |
     |  Cinder API           |        |                       |        |                       |
     +-----------------------+        +-----------------------+        +-----------------------+

[1] Create a volume group for Cinder on Storage Node.
root@storage:~#
pvcreate /dev/sdb1

Physical volume "/dev/sdb1" successfully created
root@storage:~#
vgcreate -s 32M vg_volume01 /dev/sdb1

Volume group "vg_volume01" successfully created
[2] Configure Cinder Volume on Storage Node.
root@storage:~#
vi /etc/cinder/cinder.conf
# add follows into [DEFAULT] section

enabled_backends = lvm
# add follows to the end

[lvm]
iscsi_helper = tgtadm
# volume group name just created

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
root@storage:~#
systemctl restart cinder-volume
[3] Configure Nova on Compute Node.
root@node01:~#
vi /etc/nova/nova.conf
# add to the end

[cinder]
os_region_name = RegionOne
root@node01:~#
systemctl restart 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          | 2017-03-17T01:16:45.784134           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | a199c75c-f0aa-40f5-a309-2eea9dec479e |
| 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             | 6ecb1a2e5f664d508afac2b985508a0d     |
+---------------------+--------------------------------------+

root@dlp ~(keystone)#
openstack volume list

+------------------------------+--------------+-----------+------+-------------+
| ID                           | Display Name | Status    | Size | Attached to |
+------------------------------+--------------+-----------+------+-------------+
| a199c75c-f0aa-               | disk01       | available |   10 |             |
| 40f5-a309-2eea9dec479e       |              |           |      |             |
+------------------------------+--------------+-----------+------+-------------+
[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 |
+--------------------+-------------+---------+--------------------+------------+
| 9b506f0f-4c3b-458b | Ubuntu_1604 | SHUTOFF | int_net=192.168.10 | Ubuntu1604 |
| -9213-17de1c4da03c |             |         | 0.6, 10.0.0.203    |            |
+--------------------+-------------+---------+--------------------+------------+

root@dlp ~(keystone)#
openstack server add volume Ubuntu_1604 disk01
# the status of attached disk turns "in-use" like follows

root@dlp ~(keystone)#
openstack volume list

+-----------------------+--------------+--------+------+-----------------------+
| ID                    | Display Name | Status | Size | Attached to           |
+-----------------------+--------------+--------+------+-----------------------+
| a199c75c-f0aa-40f5-a3 | disk01       | in-use |   10 | Attached to           |
| 09-2eea9dec479e       |              |        |      | Ubuntu_1604 on        |
|                       |              |        |      | /dev/vdb              |
+-----------------------+--------------+--------+------+-----------------------+

# detach the disk

root@dlp ~(keystone)#
openstack server remove volume Ubuntu_1604 disk01

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