CentOS 7
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OpenStack Ocata : Cinder Storage (Multi-BackEnds)
2017/03/05
 
It's possible to use Virtual Storages provided by Cinder if an Instance needs more disks.
Configure Virtual storage with LVM and NFS Multi-Backend on here.
 ------------+--------------------------+--------------------------+-------------------------+------------
             |                          |                          |                         |
         eth0|10.0.0.30             eth0|10.0.0.50             eth0|10.0.0.51            eth0|10.0.0.35
 +-----------+-----------+  +-----------+-----------+  +-----------+-----------+  +----------+-----------+
 |    [ Control Node ]   |  |    [ Storage Node ]   |  |    [ Compute Node ]   |  |   [  NFS Server  ]   |
 |                       |  |                       |  |                       |  |                      |
 |  MariaDB    RabbitMQ  |  |      Open vSwitch     |  |        Libvirt        |  +----------------------+
 |  Memcached  httpd     |  |  L2,L3,Metadata Agent |  |      Nova Compute     |
 |  Keystone   Glance    |  |     Cinder-Volume     |  |      Open vSwitch     |
 |  Nova API             |  |     iSCSI Target      |  |        L2 Agent       |
 |  Neutron Server       |  |                       |  |                       |
 |  Cinder API           |  |                       |  |                       |
 +-----------------------+  +-----------------------+  +-----------------------+

[1]
For LVM backend on this example, use a volume group [vg_volume01] for it.
[2]
NFS server is required to be running on your LAN, refer to here.
On this example, configure [/var/nfs-share] directory on "nfs.srv.world" as a shared directory.
[3] Configure Storage Node.
[root@storage ~]#
yum -y install nfs-utils
[root@storage ~]#
vi /etc/idmapd.conf
# line 5: uncomment and change to the own domain name

Domain =
srv.world
[root@storage ~]#
vi /etc/cinder/cinder.conf
# add follows in the [DEFAULT] section

enabled_backends = lvm,nfs

# add follows to the end
[lvm]
iscsi_helper = lioadm
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

[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 

[root@storage ~]#
vi /etc/cinder/nfs_shares
# create new : specify NFS shared directories

nfs.srv.world:/var/nfs-share
[root@storage ~]#
chmod 640 /etc/cinder/nfs_shares

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

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

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

[4] Configure Compute Node.
[root@node01 ~]#
yum -y install nfs-utils
[root@node01 ~]#
vi /etc/idmapd.conf
# line 5: uncomment and change to the own domain name

Domain =
srv.world
[root@node01 ~]#
vi /etc/nova/nova.conf
# add follows to the end

[cinder]
os_region_name = RegionOne
[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)]#
openstack volume type create lvm

+-------------+--------------------------------------+
| Field       | Value                                |
+-------------+--------------------------------------+
| description | None                                 |
| id          | 5c2ae2be-5fbe-41a2-a3a7-98255c29cbdc |
| is_public   | True                                 |
| name        | lvm                                  |
+-------------+--------------------------------------+

[root@dlp ~(keystone)]#
openstack volume type create nfs

+-------------+--------------------------------------+
| Field       | Value                                |
+-------------+--------------------------------------+
| description | None                                 |
| id          | d622ffa6-90b6-47cf-9070-109617ecdca9 |
| is_public   | True                                 |
| name        | nfs                                  |
+-------------+--------------------------------------+

[root@dlp ~(keystone)]#
openstack volume type list

+--------------------------------------+------+-----------+
| ID                                   | Name | Is Public |
+--------------------------------------+------+-----------+
| 5c2ae2be-5fbe-41a2-a3a7-98255c29cbdc | lvm  | True      |
| d622ffa6-90b6-47cf-9070-109617ecdca9 | nfs  | True      |
+--------------------------------------+------+-----------+
[6] Create volumes with specifying volume types.
[root@dlp ~(keystone)]#
openstack volume create --type lvm --size 10 disk_lvm

+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| attachments         | []                                   |
| availability_zone   | nova                                 |
| bootable            | false                                |
| consistencygroup_id | None                                 |
| created_at          | 2017-03-05T06:28:39.903021           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | b73e48b7-ba7e-485a-b9cc-5e1cfd1f3879 |
| migration_status    | None                                 |
| multiattach         | False                                |
| name                | disk_lvm                             |
| properties          |                                      |
| replication_status  | None                                 |
| size                | 10                                   |
| snapshot_id         | None                                 |
| source_volid        | None                                 |
| status              | creating                             |
| type                | lvm                                  |
| updated_at          | None                                 |
| user_id             | cf3c5cbcdd214707b91d322a69af038e     |
+---------------------+--------------------------------------+

[root@dlp ~(keystone)]#
openstack volume create --type nfs --size 10 disk_nfs

+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| attachments         | []                                   |
| availability_zone   | nova                                 |
| bootable            | false                                |
| consistencygroup_id | None                                 |
| created_at          | 2017-03-05T06:28:56.732190           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | 8c179ba4-dd4b-406d-9263-143f5e1da009 |
| migration_status    | None                                 |
| multiattach         | False                                |
| name                | disk_nfs                             |
| properties          |                                      |
| replication_status  | None                                 |
| size                | 10                                   |
| snapshot_id         | None                                 |
| source_volid        | None                                 |
| status              | creating                             |
| type                | nfs                                  |
| updated_at          | None                                 |
| user_id             | cf3c5cbcdd214707b91d322a69af038e     |
+---------------------+--------------------------------------+

[root@dlp ~(keystone)]#
openstack volume list

+--------------------------------------+--------------+-----------+------+-------------+
| ID                                   | Display Name | Status    | Size | Attached to |
+--------------------------------------+--------------+-----------+------+-------------+
| 8c179ba4-dd4b-406d-9263-143f5e1da009 | disk_nfs     | available |   10 |             |
| b73e48b7-ba7e-485a-b9cc-5e1cfd1f3879 | disk_lvm     | available |   10 |             |
+--------------------------------------+--------------+-----------+------+-------------+
[7] Attache volume to an instance.
[root@dlp ~(keystone)]#
openstack server list

+-----------+----------+---------+-----------------------------------+------------+
| ID        | Name     | Status  | Networks                          | Image Name |
+-----------+----------+---------+-----------------------------------+------------+
| b17e0565- | CentOS_7 | SHUTOFF | int_net=192.168.100.5, 10.0.0.201 | CentOS7    |
+-----------+----------+---------+-----------------------------------+------------+

[root@dlp ~(keystone)]#
openstack server add volume CentOS_7 disk_lvm

[root@dlp ~(keystone)]#
openstack server add volume CentOS_7 disk_nfs
# the status of attached disk turns "in-use" like follows

[root@dlp ~(keystone)]#
openstack volume list

+--------------------------------------+--------------+--------+------+-----------------------------------+
| ID                                   | Display Name | Status | Size | Attached to                       |
+--------------------------------------+--------------+--------+------+-----------------------------------+
| 8c179ba4-dd4b-406d-9263-143f5e1da009 | disk_nfs     | in-use |   10 | Attached to CentOS_7 on /dev/vdc  |
| b73e48b7-ba7e-485a-b9cc-5e1cfd1f3879 | disk_lvm     | in-use |   10 | Attached to CentOS_7 on /dev/vdb  |
+--------------------------------------+--------------+--------+------+-----------------------------------+

# detach the disk

[root@dlp ~(keystone)]#
openstack server remove volume CentOS_7 disk_lvm

[root@dlp ~(keystone)]#
openstack server remove volume CentOS_7 disk_nfs

 
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