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

enabled_backends = glusterfs
# add follwos to the end

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

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

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

[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_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           |       2016-05-10T12:26:27.000000      |
|          description           |                  None                 |
|           encrypted            |                 False                 |
|               id               |  0f0ec52b-27eb-46a4-a922-0faba41fecd2 |
|            metadata            |                   {}                  |
|        migration_status        |                  None                 |
|          multiattach           |                 False                 |
|              name              |                 disk01                |
|     os-vol-host-attr:host      | network.srv.world@glusterfs#GlusterFS |
| 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           |       2016-05-10T12:26:27.000000      |
|            user_id             |    f9c0838d5fcf4a87ba2e0b1653faa6d0   |
|          volume_type           |                  None                 |
+--------------------------------+---------------------------------------+

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

+--------------------------------------+-----------+--------+------+-------------+----------+-------------+
|                  ID                  |   Status  |  Name  | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+--------+------+-------------+----------+-------------+
| 0f0ec52b-27eb-46a4-a922-0faba41fecd2 | available | disk01 |  10  |      -      |  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                          |
+-----------+----------+---------+------------+-------------+-----------------------------------+
| 4e232450- | CentOS_7 | SHUTOFF | -          | Shutdown    | int_net=192.168.100.3, 10.0.0.201 |
+-----------+----------+---------+------------+-------------+-----------------------------------+

[root@dlp ~(keystone)]#
nova volume-attach CentOS_7 0f0ec52b-27eb-46a4-a922-0faba41fecd2 auto

+----------+--------------------------------------+
| Property | Value                                |
+----------+--------------------------------------+
| device   | /dev/vdb                             |
| id       | 60abe5d1-1f4c-4876-b287-e1bbd0703639 |
| serverId | 4e232450-4cae-47ba-a19a-1c59e3cbc91b |
| volumeId | 60abe5d1-1f4c-4876-b287-e1bbd0703639 |
+----------+--------------------------------------+

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

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

+--------------------------------------+--------+--------+------+-------------+----------+--------------------------------------+
|                  ID                  | Status |  Name  | Size | Volume Type | Bootable |             Attached to              |
+--------------------------------------+--------+--------+------+-------------+----------+--------------------------------------+
| 0f0ec52b-27eb-46a4-a922-0faba41fecd2 | in-use | disk01 |  10  |      -      |  false   | 4e232450-4cae-47ba-a19a-1c59e3cbc91b |
+--------------------------------------+--------+--------+------+-------------+----------+--------------------------------------+
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