CentOS 7
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OpenStack Liberty : Cinder Storage(LVM)
2015/11/15
 
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.
                                      +------------------+
                             10.0.0.35| [ Storage Node ] |
+------------------+            +-----+   Cinder-Volume  |
| [ Control Node ] |            | eth0|                  |
|     Keystone     |10.0.0.30   |     +------------------+
|      Glance      |------------+
|     Nova API     |eth0        |     +------------------+
|    Cinder API    |            | eth0| [ Compute Node ] |
+------------------+            +-----+   Nova Compute   |
                             10.0.0.51|                  |
                                      +------------------+

[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 = lioadm
# 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 openstack-cinder-volume

[3] Configure Nova on Compute Node.
[root@node01 ~]#
vi /etc/nova/nova.conf
# add follows into [DEFAULT] section

osapi_volume_listen=0.0.0.0
volume_api_class=nova.volume.cinder.API
[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)]#
cinder create --display_name disk01 10

+---------------------------------------+--------------------------------------+
|                Property               |                Value                 |
+---------------------------------------+--------------------------------------+
|              attachments              |                  []                  |
|           availability_zone           |                 nova                 |
|                bootable               |                false                 |
|          consistencygroup_id          |                 None                 |
|               created_at              |      2015-11-14T18:16:57.000000      |
|              description              |                 None                 |
|               encrypted               |                False                 |
|                   id                  | 9f6cf69d-4d4a-467e-bc74-1ab761e045b2 |
|                metadata               |                  {}                  |
|            migration_status           |                 None                 |
|              multiattach              |                False                 |
|                  name                 |                disk01                |
|         os-vol-host-attr:host         |                 None                 |
|     os-vol-mig-status-attr:migstat    |                 None                 |
|     os-vol-mig-status-attr:name_id    |                 None                 |
|      os-vol-tenant-attr:tenant_id     |   d625e02b3d394afbad250def2f88fefa   |
|   os-volume-replication:driver_data   |                 None                 |
| os-volume-replication:extended_status |                 None                 |
|           replication_status          |               disabled               |
|                  size                 |                  10                  |
|              snapshot_id              |                 None                 |
|              source_volid             |                 None                 |
|                 status                |               creating               |
|                user_id                |   b4c316b93a464f8ea46b01bd01a52003   |
|              volume_type              |                 None                 |
+---------------------------------------+--------------------------------------+

[root@dlp ~(keystone)]#
cinder list

+-----------+-----------+------------------+--------+------+-------------+----------+-------------+-------------+
| ID        |   Status  | Migration Status |  Name  | Size | Volume Type | Bootable | Multiattach | Attached to |
+-----------+-----------+------------------+--------+------+-------------+----------+-------------+-------------+
| 9f6cf69d- | available |        -         | disk01 |  10  |      -      |  false   |    False    |             |
+-----------+-----------+------------------+--------+------+-------------+----------+-------------+-------------+
[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)]#
nova list

+-----------+----------+---------+------------+-------------+-----------------------------------+
| ID        | Name     | Status  | Task State | Power State | Networks                          |
+-----------+----------+---------+------------+-------------+-----------------------------------+
| f97deee6- | CentOS_7 | SHUTOFF | -          | Shutdown    | int_net=192.168.100.3, 10.0.0.201 |
+-----------+----------+---------+------------+-------------+-----------------------------------+

[root@dlp ~(keystone)]#
nova volume-attach CentOS_7 9f6cf69d-4d4a-467e-bc74-1ab761e045b2 auto

+----------+--------------------------------------+
| Property | Value                                |
+----------+--------------------------------------+
| device   | /dev/vdb                             |
| id       | 9f6cf69d-4d4a-467e-bc74-1ab761e045b2 |
| serverId | f97deee6-e49e-4db5-9311-348d15921999 |
| volumeId | 9f6cf69d-4d4a-467e-bc74-1ab761e045b2 |
+----------+--------------------------------------+

# the status of attached disk turns "in-use" like follows

[root@dlp ~(keystone)]#
cinder list

+-----------+--------+------------------+--------+------+-------------+----------+-------------+----------------+
| ID        | Status | Migration Status |  Name  | Size | Volume Type | Bootable | Multiattach | Attached to    |
+-----------+--------+------------------+--------+------+-------------+----------+-------------+----------------+
| 9f6cf69d- | in-use |        -         | disk01 |  10  |      -      |  false   |    False    | f97deee6-e49e- |
+-----------+--------+------------------+--------+------+-------------+----------+-------------+----------------+
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