CentOS 7
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OpenStack Juno : Use Virtual Storages(Multi-Backend)
2015/01/12
 
It's possible to use the Virtual Storage provided by Cinder if an Instance needs more disks.
Configure Virtual storage with NFS and GlusterFS Multi-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|                  |
                                      +------------------+     |     +------------------+
                                                               |
                                                               |     +------------------+
                                                               | eth0|                  |
                                                               +-----+        NFS       |
                                                            10.0.0.40|                  |
                                                                     +------------------+
[1]
NFS server is required to be running on your LAN.
On this example, configure "/storage" directory on "nfs.srv.world" as a shared directory.
[2]
GlusterFS server is required to be running on your LAN. This example uses a replication volume "vol_replica" provided by "gfs01" and "gfs02".
[3] Configure Storage Node.
# install from EPEL

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

enabled_backends=nfs,glusterfs
[nfs]
volume_driver=cinder.volume.drivers.nfs.NfsDriver
volume_backend_name=NFS
nfs_shares_config=/etc/cinder/nfs_shares
nfs_mount_point_base=/var/lib/cinder/nfs
[glusterfs]
volume_driver=cinder.volume.drivers.glusterfs.GlusterfsDriver
volume_backend_name=GlusterFS
glusterfs_shares_config=/etc/cinder/glusterfs_shares
glusterfs_mount_point_base=/var/lib/cinder/glusterfs
[root@storage ~]#
vi /etc/cinder/nfs_shares
# create new : specify NFS shared directories

nfs.srv.world:/storage
[root@storage ~]#
vi /etc/cinder/glusterfs_shares
# create new : specify GlusterFS volumes

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

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

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

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

[root@storage ~]#
chmod 640 /etc/cinder/glusterfs_shares

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

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

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

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

[4] Configure Compute Node to mount NFS and GlusterFS volumes.
# install from EPEL

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

volume_drivers="nfs=nova.virt.libvirt.volume.LibvirtNFSVolumeDriver, glusterfs=nova.virt.libvirt.volume.LibvirtGlusterfsVolumeDriver"
[root@node01 ~]#
systemctl restart openstack-nova-compute

[5] Create volume types.
[root@dlp ~(keystone)]#
cinder type-create nfs

+--------------------------------------+------+
|                  ID                  | Name |
+--------------------------------------+------+
| 1a9f4e84-6b17-405b-8153-283a6623b8f1 | nfs  |
+--------------------------------------+------+

[root@dlp ~(keystone)]#
cinder type-create glusterfs

+--------------------------------------+-----------+
|                  ID                  |    Name   |
+--------------------------------------+-----------+
| 9bcb19f3-e91e-4d6b-8b83-cb59c9b45a2f | glusterfs |
+--------------------------------------+-----------+

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

+--------------------------------------+-----------+
|                  ID                  |    Name   |
+--------------------------------------+-----------+
| 1a9f4e84-6b17-405b-8153-283a6623b8f1 |    nfs    |
| 9bcb19f3-e91e-4d6b-8b83-cb59c9b45a2f | glusterfs |
+--------------------------------------+-----------+
[6] Associates volume types set in [5] and names set in cinder.conf.
[root@dlp ~(keystone)]#
cinder type-key nfs set volume_backend_name=NFS

[root@dlp ~(keystone)]#
cinder type-key glusterfs set volume_backend_name=GlusterFS

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

+--------------------------------------+-----------+----------------------------------------+
|                  ID                  |    Name   |              extra_specs               |
+--------------------------------------+-----------+----------------------------------------+
| 1a9f4e84-6b17-405b-8153-283a6623b8f1 |    nfs    |    {u'volume_backend_name': u'NFS'}    |
| 9bcb19f3-e91e-4d6b-8b83-cb59c9b45a2f | glusterfs | {u'volume_backend_name': u'GlusterFS'} |
+--------------------------------------+-----------+----------------------------------------+
[7] Create volumes with specifying volume types.
[root@dlp ~(keystone)]#
cinder create --display_name disk_nfs --volume-type nfs 10

+---------------------+--------------------------------------+
|       Property      |                Value                 |
+---------------------+--------------------------------------+
|     attachments     |                  []                  |
|  availability_zone  |                 nova                 |
|       bootable      |                false                 |
|      created_at     |      2015-01-12T14:20:29.830582      |
| display_description |                 None                 |
|     display_name    |               disk_nfs               |
|      encrypted      |                False                 |
|          id         | 980dd6f0-eefa-4234-847c-14d07008624e |
|       metadata      |                  {}                  |
|         size        |                  10                  |
|     snapshot_id     |                 None                 |
|     source_volid    |                 None                 |
|        status       |               creating               |
|     volume_type     |                 nfs                  |
+---------------------+--------------------------------------+

[root@dlp ~(keystone)]#
cinder create --display_name disk_glusterfs --volume-type glusterfs 10

+---------------------+--------------------------------------+
|       Property      |                Value                 |
+---------------------+--------------------------------------+
|     attachments     |                  []                  |
|  availability_zone  |                 nova                 |
|       bootable      |                false                 |
|      created_at     |      2015-01-12T14:20:44.268581      |
| display_description |                 None                 |
|     display_name    |            disk_glusterfs            |
|      encrypted      |                False                 |
|          id         | a4ddc65b-3d3b-44c6-a0bd-4cc9a64cdc9d |
|       metadata      |                  {}                  |
|         size        |                  10                  |
|     snapshot_id     |                 None                 |
|     source_volid    |                 None                 |
|        status       |               creating               |
|     volume_type     |              glusterfs               |
+---------------------+--------------------------------------+

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

+--------------------------------------+-----------+----------------+------+-------------+----------+-------------+
|                  ID                  |   Status  |  Display Name  | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+----------------+------+-------------+----------+-------------+
| 980dd6f0-eefa-4234-847c-14d07008624e | available |    disk_nfs    |  10  |     nfs     |  false   |             |
| a4ddc65b-3d3b-44c6-a0bd-4cc9a64cdc9d | available | disk_glusterfs |  10  |  glusterfs  |  false   |             |
+--------------------------------------+-----------+----------------+------+-------------+----------+-------------+
[8] The Configuration is all OK. Attach volumes to instances like follows.
[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 980dd6f0-eefa-4234-847c-14d07008624e auto

+----------+--------------------------------------+
| Property | Value                                |
+----------+--------------------------------------+
| device   | /dev/vdb                             |
| id       | 980dd6f0-eefa-4234-847c-14d07008624e |
| serverId | df11d64d-dd72-4d1a-bf0a-5cd764c2f863 |
| volumeId | 980dd6f0-eefa-4234-847c-14d07008624e |
+----------+--------------------------------------+

[root@dlp ~(keystone)]#
nova volume-attach CentOS_70 a4ddc65b-3d3b-44c6-a0bd-4cc9a64cdc9d auto

+----------+--------------------------------------+
| Property | Value                                |
+----------+--------------------------------------+
| device   | /dev/vdc                             |
| id       | a4ddc65b-3d3b-44c6-a0bd-4cc9a64cdc9d |
| serverId | df11d64d-dd72-4d1a-bf0a-5cd764c2f863 |
| volumeId | a4ddc65b-3d3b-44c6-a0bd-4cc9a64cdc9d |
+----------+--------------------------------------+

# 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              |
+--------------------------------------+--------+----------------+------+-------------+----------+--------------------------------------+
| 980dd6f0-eefa-4234-847c-14d07008624e | in-use |    disk_nfs    |  10  |     nfs     |  false   | df11d64d-dd72-4d1a-bf0a-5cd764c2f863 |
| a4ddc65b-3d3b-44c6-a0bd-4cc9a64cdc9d | in-use | disk_glusterfs |  10  |  glusterfs  |  false   | df11d64d-dd72-4d1a-bf0a-5cd764c2f863 |
+--------------------------------------+--------+----------------+------+-------------+----------+--------------------------------------+
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