OpenStack Epoxy : Use Cinder Storage (NFS)

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) | | (Network Node) | | (Compute Node) | | | | | | | | MariaDB RabbitMQ | | Open vSwitch | | Libvirt | | Memcached Nginx | | Neutron Server | | Nova Compute | | Keystone httpd | | OVN-Northd | | Open vSwitch | | Glance Nova API | | Nginx iSCSI Target | | OVN Metadata Agent | | Cinder API | | Cinder Volume | | 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:~#  apt -y install nfs-common 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 the value to [enabled_backends] param enabled_backends =  nfs # add to last line [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 cinder-volume root@network:~#  chown -R cinder:cinder /var/lib/cinder/mnt

[3]	Change Nova settings on Compute Node to mount NFS.

root@node01:~#  apt -y install nfs-common 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 follows into the [keystone_authtoken] section [keystone_authtoken] ..... ..... service_token_roles = service service_token_roles_required = true # add to last line [service_user] send_service_user_token = true auth_url = https://dlp.srv.world:5000 auth_type = password project_domain_name = Default user_domain_name = Default project_name = service username = nova password = servicepassword insecure = false [cinder] os_region_name = RegionOne root@node01:~#  systemctl restart nova-compute

[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 debian@dlp ~(keystone)$  echo "export OS_VOLUME_API_VERSION=3" >> ~/keystonerc debian@dlp ~(keystone)$  source ~/keystonerc debian@dlp ~(keystone)$  openstack volume create --size 10 disk01 +---------------------+--------------------------------------+ | Field | Value | +---------------------+--------------------------------------+ | attachments | [] | | availability_zone | nova | | bootable | false | | consistencygroup_id | None | | created_at | 2025-09-01T00:38:49.527941 | | description | None | | encrypted | False | | id | 9d11c8f3-2339-4959-a77c-90598cdc0e1c | | 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 | da64c3c335434563b66eb2e8af260392 | +---------------------+--------------------------------------+ debian@dlp ~(keystone)$  openstack volume list +------------------------------------+--------+-----------+------+-------------+ | ID | Name | Status | Size | Attached to | +------------------------------------+--------+-----------+------+-------------+ | 9d11c8f3-2339-4959-a77c- | disk01 | available | 10 | | | 90598cdc0e1c | | | | | +------------------------------------+--------+-----------+------+-------------+

[5]	Attach the virtual disk to an Instance. For the example below, the disk is connected as [/dev/vdb]. It's possible to use it as a storage to create a file system on it.

debian@dlp ~(keystone)$  openstack server list +----------------+-----------+---------+-----------------+----------+----------+ | ID | Name | Status | Networks | Image | Flavor | +----------------+-----------+---------+-----------------+----------+----------+ | 2deabceb-e220- | Debian-13 | SHUTOFF | private=10.0.0. | Debian13 | m1.small | | 4e5c-b8dd- | | | 249, | | | | 320683d0bf0b | | | 192.168.100.39 | | | +----------------+-----------+---------+-----------------+----------+----------+ debian@dlp ~(keystone)$  openstack server add volume Debian-13 disk01 +-----------------------+--------------------------------------+ | Field | Value | +-----------------------+--------------------------------------+ | ID | 9d11c8f3-2339-4959-a77c-90598cdc0e1c | | Server ID | 2deabceb-e220-4e5c-b8dd-320683d0bf0b | | Volume ID | 9d11c8f3-2339-4959-a77c-90598cdc0e1c | | Device | /dev/vdb | | Tag | None | | Delete On Termination | False | +-----------------------+--------------------------------------+ # the status of attached disk turns [in-use] like follows debian@dlp ~(keystone)$  openstack volume list +--------------------------+--------+--------+------+--------------------------+ | ID | Name | Status | Size | Attached to | +--------------------------+--------+--------+------+--------------------------+ | 9d11c8f3-2339-4959-a77c- | disk01 | in-use | 10 | Attached to Debian-13 on | | 90598cdc0e1c | | | | /dev/vdb | +--------------------------+--------+--------+------+--------------------------+ # to detach the disk, do like follows debian@dlp ~(keystone)$  openstack server remove volume Debian-13 disk01

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