CentOS 7
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OpenStack Mitaka : Use Cinder Storage (Multi-BackEnds)
2016/05/10
 
It's possible to use Virtual Storages 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, refer to here.
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, refer to here.
This example uses a replication volume "vol_replica" provided by "glfs01" and "glfs02".
[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
# add follows to the end

[nfs]
volume_driver = cinder.volume.drivers.nfs.NfsDriver
volume_backend_name = NFS
nfs_shares_config = /etc/cinder/nfs_shares
nfs_mount_point_base = $state_path/mnt_nfs
[glusterfs]
volume_driver = cinder.volume.drivers.glusterfs.GlusterfsDriver
volume_backend_name = GlusterFS
glusterfs_shares_config = /etc/cinder/glusterfs_shares
glusterfs_mount_point_base = $state_path/mnt_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

glfs01.srv.world:/vol_replica
[root@storage ~]#
chmod 640 /etc/cinder/nfs_shares

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

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

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

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

[root@storage ~]#
chown -R cinder. /var/lib/cinder/mnt_nfs

[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_api_class = nova.volume.cinder.API
[root@node01 ~]#
systemctl restart openstack-nova-compute

[5] Create volume types. 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 type-create nfs

+--------------------------------------+------+-------------+-----------+
|                  ID                  | Name | Description | Is_Public |
+--------------------------------------+------+-------------+-----------+
| 3a387d34-973d-4dde-b4d4-2f1052080dea | nfs  |      -      |    True   |
+--------------------------------------+------+-------------+-----------+

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

+--------------------------------------+-----------+-------------+-----------+
|                  ID                  |    Name   | Description | Is_Public |
+--------------------------------------+-----------+-------------+-----------+
| 2ec412a2-11f9-4ee9-bcf7-386019fc8b22 | glusterfs |      -      |    True   |
+--------------------------------------+-----------+-------------+-----------+

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

+--------------------------------------+-----------+-------------+-----------+
|                  ID                  |    Name   | Description | Is_Public |
+--------------------------------------+-----------+-------------+-----------+
| 2ec412a2-11f9-4ee9-bcf7-386019fc8b22 | glusterfs |      -      |    True   |
| 3a387d34-973d-4dde-b4d4-2f1052080dea |    nfs    |      -      |    True   |
+--------------------------------------+-----------+-------------+-----------+
[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              |
+--------------------------------------+-----------+--------------------------------------+
| 2ec412a2-11f9-4ee9-bcf7-386019fc8b22 | glusterfs | {'volume_backend_name': 'GlusterFS'} |
| 3a387d34-973d-4dde-b4d4-2f1052080dea |    nfs    |    {'volume_backend_name': 'NFS'}    |
+--------------------------------------+-----------+--------------------------------------+
[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                 |
|      consistencygroup_id       |                 None                 |
|           created_at           |      2016-05-10T12:36:15.000000      |
|          description           |                 None                 |
|           encrypted            |                False                 |
|               id               | 3365c5e9-14ee-4606-adbf-386580befd63 |
|            metadata            |                  {}                  |
|        migration_status        |                 None                 |
|          multiattach           |                False                 |
|              name              |               disk_nfs               |
|     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  |   7a160aeddebd4e398fd22e6491f10baa   |
|       replication_status       |               disabled               |
|              size              |                  10                  |
|          snapshot_id           |                 None                 |
|          source_volid          |                 None                 |
|             status             |               creating               |
|           updated_at           |                 None                 |
|            user_id             |   f9c0838d5fcf4a87ba2e0b1653faa6d0   |
|          volume_type           |                 nfs                  |
+--------------------------------+--------------------------------------+

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

+--------------------------------+--------------------------------------+
|            Property            |                Value                 |
+--------------------------------+--------------------------------------+
|          attachments           |                  []                  |
|       availability_zone        |                 nova                 |
|            bootable            |                false                 |
|      consistencygroup_id       |                 None                 |
|           created_at           |      2016-05-10T12:36:34.000000      |
|          description           |                 None                 |
|           encrypted            |                False                 |
|               id               | a01e06f7-17a5-4a76-966e-db5f5cf53a8b |
|            metadata            |                  {}                  |
|        migration_status        |                 None                 |
|          multiattach           |                False                 |
|              name              |            disk_glusterfs            |
|     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  |   7a160aeddebd4e398fd22e6491f10baa   |
|       replication_status       |               disabled               |
|              size              |                  10                  |
|          snapshot_id           |                 None                 |
|          source_volid          |                 None                 |
|             status             |               creating               |
|           updated_at           |                 None                 |
|            user_id             |   f9c0838d5fcf4a87ba2e0b1653faa6d0   |
|          volume_type           |              glusterfs               |
+--------------------------------+--------------------------------------+

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

+--------------------------------------+-----------+----------------+------+-------------+----------+-------------+
|                  ID                  |   Status  |      Name      | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+----------------+------+-------------+----------+-------------+
| 3365c5e9-14ee-4606-adbf-386580befd63 | available |    disk_nfs    |  10  |     nfs     |  false   |             |
| a01e06f7-17a5-4a76-966e-db5f5cf53a8b | 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                          |
+-----------+----------+---------+------------+-------------+-----------------------------------+
| 4e232450- | CentOS_7 | SHUTOFF | -          | Shutdown    | int_net=192.168.100.3, 10.0.0.201 |
+-----------+----------+---------+------------+-------------+-----------------------------------+

[root@dlp ~(keystone)]#
nova volume-attach CentOS_7 3365c5e9-14ee-4606-adbf-386580befd63 auto

+----------+--------------------------------------+
| Property | Value                                |
+----------+--------------------------------------+
| device   | /dev/vdb                             |
| id       | 3365c5e9-14ee-4606-adbf-386580befd63 |
| serverId | 4e232450-4cae-47ba-a19a-1c59e3cbc91b |
| volumeId | 3365c5e9-14ee-4606-adbf-386580befd63 |
+----------+--------------------------------------+

[root@dlp ~(keystone)]#
nova volume-attach CentOS_7 a01e06f7-17a5-4a76-966e-db5f5cf53a8b auto

+----------+--------------------------------------+
| Property | Value                                |
+----------+--------------------------------------+
| device   | /dev/vdc                             |
| id       | a01e06f7-17a5-4a76-966e-db5f5cf53a8b |
| serverId | 4e232450-4cae-47ba-a19a-1c59e3cbc91b |
| volumeId | a01e06f7-17a5-4a76-966e-db5f5cf53a8b |
+----------+--------------------------------------+

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

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

+--------------------------------------+--------+----------------+------+-------------+----------+--------------------------------------+
|                  ID                  | Status |      Name      | Size | Volume Type | Bootable |             Attached to              |
+--------------------------------------+--------+----------------+------+-------------+----------+--------------------------------------+
| 3365c5e9-14ee-4606-adbf-386580befd63 | in-use |    disk_nfs    |  10  |     nfs     |  false   | 4e232450-4cae-47ba-a19a-1c59e3cbc91b |
| a01e06f7-17a5-4a76-966e-db5f5cf53a8b | in-use | disk_glusterfs |  10  |  glusterfs  |  false   | 4e232450-4cae-47ba-a19a-1c59e3cbc91b |
+--------------------------------------+--------+----------------+------+-------------+----------+--------------------------------------+
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