CentOS Stream 9
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OpenStack Yoga : Use Cinder Storage (NFS)
2022/06/10
 
It's possible to use Virtual Storages provided by Cinder if an Instance needs more disks.
Configure Virtual storage with NFS backend on here.
------------+-----------------------------+-----------------------------+--------------+
            |                             |                             |              |
        eth0|10.0.0.30                eth0|10.0.0.50                eth0|10.0.0.51     |
+-----------+-----------+     +-----------+-----------+     +-----------+-----------+  |
|   [ dlp.srv.world ]   |     | [ network.srv.world ] |     |  [ node01.srv.world ] |  |
|     (Control Node)    |     |     (Storage Node)    |     |     (Compute Node)    |  |
|                       |     |                       |     |                       |  |
|  MariaDB    RabbitMQ  |     |      Open vSwitch     |     |        Libvirt        |  |
|  Memcached  httpd     |     |     Neutron Server    |     |      Nova Compute     |  |
|  Keystone   Glance    |     |      OVN-Northd       |     |      Open vSwitch     |  |
|  Nova API  Cinder API |     |     Cinder Volume     |     |   OVN Metadata Agent  |  |
|                       |     |                       |     |     OVN-Controller    |  |
+-----------------------+     +-----------------------+     +-----------------------+  |
                                                                                       |
-----------+---------------------------------------------------------------------------+
       eth0|10.0.0.35
+----------+-----------+
|   [ nfs.srv.world ]  |
|       NFS Server     |
+----------------------+

[1]
NFS server is required to be running on your local network, refer to here.
On this example, configure [/var/lib/nfs-share] directory on [nfs.srv.world] as a shared directory.
[2] Configure Storage Node.
[root@network ~]#
dnf -y install nfs-utils
[root@network ~]#
vi /etc/idmapd.conf
# line 5 : uncomment and change to your domain name

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

enabled_backends = nfs
# add follows to the end

[nfs]
volume_driver = cinder.volume.drivers.nfs.NfsDriver
nfs_shares_config = /etc/cinder/nfs_shares
nfs_mount_point_base = $state_path/mnt
[root@network ~]#
vi /etc/cinder/nfs_shares
# create new : specify NFS shared directory
# if set multiple share, write one per line

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

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

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

[root@network ~]#
chown -R cinder. /var/lib/cinder/mnt

[3] Change Nova settings on Compute Node to mount NFS.
[root@node01 ~]#
dnf -y install nfs-utils
[root@node01 ~]#
vi /etc/idmapd.conf
# line 5 : uncomment and change to your domain name

Domain =
srv.world
[root@node01 ~]#
vi /etc/iscsi/initiatorname.iscsi
# create new
# set any InitiatorName you like

InitiatorName=iqn.2022-06.world.srv:node01.initiator01
[root@node01 ~]#
vi /etc/nova/nova.conf
# add to the end

[cinder]
os_region_name = RegionOne
[root@node01 ~]#
systemctl restart openstack-nova-compute
# if SELinux is enabled, change policy like follows

[root@node01 ~]#
vi iscsiadm.te
# create new

module iscsiadm 1.0;

require {
        type iscsid_t;
        class capability dac_override;
}

#============= iscsid_t ==============
allow iscsid_t self:capability dac_override;

[root@node01 ~]#
checkmodule -m -M -o iscsiadm.mod iscsiadm.te

[root@node01 ~]#
semodule_package --outfile iscsiadm.pp --module iscsiadm.mod

[root@node01 ~]#
semodule -i iscsiadm.pp

[4] Login as a common user you'd like to add volumes to own instances.
For example, create a virtual disk [disk01] with 10GB. It's OK to work on any node. (example below is on Control Node)
# set environment variable

[cent@dlp ~(keystone)]$
echo "export OS_VOLUME_API_VERSION=3" >> ~/keystonerc

[cent@dlp ~(keystone)]$
source ~/keystonerc
[cent@dlp ~(keystone)]$
openstack volume create --size 10 disk01

+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| attachments         | []                                   |
| availability_zone   | nova                                 |
| bootable            | false                                |
| consistencygroup_id | None                                 |
| created_at          | 2022-06-09T14:34:26.942494           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | b3e6636f-aa54-476b-b054-5cae80ed7c75 |
| multiattach         | False                                |
| name                | disk01                               |
| properties          |                                      |
| replication_status  | None                                 |
| size                | 10                                   |
| snapshot_id         | None                                 |
| source_volid        | None                                 |
| status              | creating                             |
| type                | __DEFAULT__                          |
| updated_at          | None                                 |
| user_id             | 1ff4591a7f8140fcad38fd9f606a66a6     |
+---------------------+--------------------------------------+

[cent@dlp ~(keystone)]$
openstack volume list

+--------------------------------------+--------+-----------+------+-------------+
| ID                                   | Name   | Status    | Size | Attached to |
+--------------------------------------+--------+-----------+------+-------------+
| b3e6636f-aa54-476b-b054-5cae80ed7c75 | disk01 | available |   10 |             |
+--------------------------------------+--------+-----------+------+-------------+
[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.
[cent@dlp ~(keystone)]$
openstack server list

+--------------------------------------+------------+---------+-------------------------------------+----------------+----------+
| ID                                   | Name       | Status  | Networks                            | Image          | Flavor   |
+--------------------------------------+------------+---------+-------------------------------------+----------------+----------+
| 25ef320e-b16e-4085-96ef-af7fa0d33cfb | CentOS-St9 | SHUTOFF | private=10.0.0.242, 192.168.100.214 | CentOS-Stream9 | m1.small |
+--------------------------------------+------------+---------+-------------------------------------+----------------+----------+

[cent@dlp ~(keystone)]$
openstack server add volume CentOS-St9 disk01

+-----------------------+--------------------------------------+
| Field                 | Value                                |
+-----------------------+--------------------------------------+
| ID                    | b3e6636f-aa54-476b-b054-5cae80ed7c75 |
| Server ID             | 25ef320e-b16e-4085-96ef-af7fa0d33cfb |
| Volume ID             | b3e6636f-aa54-476b-b054-5cae80ed7c75 |
| Device                | /dev/vdb                             |
| Tag                   | None                                 |
| Delete On Termination | False                                |
+-----------------------+--------------------------------------+

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

[cent@dlp ~(keystone)]$
openstack volume list

+--------------------------------------+--------+--------+------+-------------------------------------+
| ID                                   | Name   | Status | Size | Attached to                         |
+--------------------------------------+--------+--------+------+-------------------------------------+
| b3e6636f-aa54-476b-b054-5cae80ed7c75 | disk01 | in-use |   10 | Attached to CentOS-St9 on /dev/vdb  |
+--------------------------------------+--------+--------+------+-------------------------------------+

# detach the disk

[cent@dlp ~(keystone)]$
openstack server remove volume CentOS-St9 disk01

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