CentOS Stream 8
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OpenStack Xena : Use Cinder Storage (NFS)
2021/11/23
 
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     |
+-----------+-----------+   +-----------+-----------+   +-----------+-----------+  |
|    [ 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 Volume     |   |   OVN Metadata Agent  |  |
|  Cinder API           |   |                       |   |     OVN-Controller    |  |
+-----------------------+   +-----------------------+   +-----------------------+  |
                                                                                   |
-----------+-----------------------------------------------------------------------+
           |
       eth0|10.0.0.35
+----------+-----------+
|   [  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] Storage ノードの設定です。
[root@storage ~]#
dnf -y install nfs-utils
[root@storage ~]#
vi /etc/idmapd.conf
# line 5 : uncomment and change to your domain name

Domain =
srv.world
[root@storage ~]#
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@storage ~]#
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@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

[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/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          | 2021-11-24T01:44:41.100890           |
| description         | None                                 |
| encrypted           | False                                |
| id                  | d273c3c9-8162-41e4-b26d-c1c275883186 |
| 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             | 6a517543654044e8b4ea9e0eea0adaa4     |
+---------------------+--------------------------------------+

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

+--------------------------------------+--------+-----------+------+-------------+
| ID                                   | Name   | Status    | Size | Attached to |
+--------------------------------------+--------+-----------+------+-------------+
| d273c3c9-8162-41e4-b26d-c1c275883186 | 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   |
+--------------------------------------+-------------+---------+-------------------------------------+-----------------+----------+
| a6180855-77cf-476f-9f26-4fc79baa38c2 | CentOS-St-8 | SHUTOFF | private=10.0.0.250, 192.168.100.108 | CentOS-Stream-8 | m1.small |
+--------------------------------------+-------------+---------+-------------------------------------+-----------------+----------+

[cent@dlp ~(keystone)]$
openstack server add volume CentOS-St-8 disk01
# the status of attached disk turns [in-use] like follows

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

+--------------------------------------+--------+--------+------+--------------------------------------+
| ID                                   | Name   | Status | Size | Attached to                          |
+--------------------------------------+--------+--------+------+--------------------------------------+
| d273c3c9-8162-41e4-b26d-c1c275883186 | disk01 | in-use |   10 | Attached to CentOS-St-8 on /dev/vdb  |
+--------------------------------------+--------+--------+------+--------------------------------------+

# detach the disk

[cent@dlp ~(keystone)]$
openstack server remove volume CentOS-St-8 disk01

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