CentOS 7
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OpenStack Juno : Use Virtual Storages(GlusterFS)
2015/01/12
 
It's possible to use the Virtual Storage provided by Cinder if an Instance needs more disks.
Configure Virtual storage with GlusterFS backend on here.
                                      +------------------+           +------------------+
                             10.0.0.50| [ Storage Node ] |  10.0.0.61|                  |
+------------------+            +-----+   Cinder-Volume  |     +-----+   GlusterFS #1   |
| [ Control Node ] |            | eth0|                  |     | eth0|                  |
|     Keystone     |10.0.0.30   |     +------------------+     |     +------------------+
|      Glance      |------------+------------------------------+
|     Nova API     |eth0        |     +------------------+     |     +------------------+
|    Cinder API    |            | eth0| [ Compute Node ] |     | eth0|                  |
+------------------+            +-----+   Nova Compute   |     +-----+   GlusterFS #2   |
                             10.0.0.51|                  |  10.0.0.62|                  |
                                      +------------------+           +------------------+

[1]
GlusterFS server is required to be running on your LAN. This example uses a replication volume "vol_replica" provided by "gfs01" and "gfs02".
[2] Configure Storage Node.
# install from EPEL

[root@storage ~]#
yum --enablerepo=epel -y install glusterfs glusterfs-fuse
[root@storage ~]#
vi /etc/cinder/cinder.conf
# add follows in the [DEFAULT] section

volume_driver=cinder.volume.drivers.glusterfs.GlusterfsDriver
glusterfs_shares_config=/etc/cinder/glusterfs_shares
glusterfs_mount_point_base=/var/lib/cinder/mnt
[root@storage ~]#
vi /etc/cinder/glusterfs_shares
# create new : specify GlusterFS volumes

gfs01.srv.world:/vol_replica
[root@storage ~]#
chmod 640 /etc/cinder/glusterfs_shares

[root@storage ~]#
chgrp cinder /etc/cinder/glusterfs_shares

[root@storage ~]#
mkdir /var/lib/cinder/mnt

[root@storage ~]#
chown cinder. /var/lib/cinder/mnt

[root@storage ~]#
systemctl restart openstack-cinder-volume

[3] Configure Compute Node to mount GlusterFS volume.
# install from EPEL

[root@node01 ~]#
yum --enablerepo=epel -y install glusterfs glusterfs-fuse
[root@node01 ~]#
vi /etc/nova/nova.conf
# add follows in the [DEFAULT] section

volume_drivers="glusterfs=nova.virt.libvirt.volume.LibvirtGlusterfsVolumeDriver"
[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)
[root@dlp ~(keystone)]#
cinder create --display_name disk01 10

+---------------------+--------------------------------------+
|       Property      |                Value                 |
+---------------------+--------------------------------------+
|     attachments     |                  []                  |
|  availability_zone  |                 nova                 |
|       bootable      |                false                 |
|      created_at     |      2015-01-12T13:47:42.608332      |
| display_description |                 None                 |
|     display_name    |                disk01                |
|      encrypted      |                False                 |
|          id         | edd2f68d-327b-41cd-966c-e46833a9309c |
|       metadata      |                  {}                  |
|         size        |                  10                  |
|     snapshot_id     |                 None                 |
|     source_volid    |                 None                 |
|        status       |               creating               |
|     volume_type     |                 None                 |
+---------------------+--------------------------------------+

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

+--------------------------------------+-----------+--------------+------+-------------+----------+-------------+
|                  ID                  |   Status  | Display Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+--------------+------+-------------+----------+-------------+
| edd2f68d-327b-41cd-966c-e46833a9309c | available |    disk01    |  10  |     None    |  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                          |
+-----------+-----------+---------+------------+-------------+-----------------------------------+
| df11d64d- | CentOS_70 | SHUTOFF | -          | Shutdown    | int_net=192.168.100.6, 10.0.0.201 |
+-----------+-----------+---------+------------+-------------+-----------------------------------+

[root@dlp ~(keystone)]#
nova volume-attach CentOS_70 edd2f68d-327b-41cd-966c-e46833a9309c auto

+----------+--------------------------------------+
| Property | Value                                |
+----------+--------------------------------------+
| device   | /dev/vdb                             |
| id       | edd2f68d-327b-41cd-966c-e46833a9309c |
| serverId | df11d64d-dd72-4d1a-bf0a-5cd764c2f863 |
| volumeId | edd2f68d-327b-41cd-966c-e46833a9309c |
+----------+--------------------------------------+

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

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

+--------------------------------------+--------+--------------+------+-------------+----------+--------------------------------------+
|                  ID                  | Status | Display Name | Size | Volume Type | Bootable |             Attached to              |
+--------------------------------------+--------+--------------+------+-------------+----------+--------------------------------------+
| edd2f68d-327b-41cd-966c-e46833a9309c | in-use |    disk01    |  10  |     None    |  false   | df11d64d-dd72-4d1a-bf0a-5cd764c2f863 |
+--------------------------------------+--------+--------------+------+-------------+----------+--------------------------------------+
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