Description
Provide cinder-volumes to compute instances
Nova-volume is a service that allows you to give extra block level storage to your OpenStack Compute instances (using iSCSI and LVM)
Setup
Start the SCSI target daemon
$> sudo systemctl start tgtd.service $> sudo systemctl enable tgtd.service
How to test
Create a new 5GB volume
$> cinder create --display_name vol-00000001 5
View status of volumes, and wait for it to become 'available'
$> cinder list +--------------------------------------+----------+--------------+------+-------------+-------------+ | ID | Status | Display Name | Size | Volume Type | Attached to | +--------------------------------------+----------+--------------+------+-------------+-------------+ | aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee | creating | vol-00000001 | 5 | None | | +--------------------------------------+----------+--------------+------+-------------+-------------+
Make the storage available to the instance
$> nova volume-attach testvm aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee /dev/vdc
ssh to the instance and verify that the vdc device
is listed in /proc/partitions
$> cat /proc/partitions
Now make the device available if /dev/vdc is not already present
$> mknod /dev/vdc b 252 32
Create and mount a file system directly on the device
$> mkfs.ext3 /dev/vdc $> mkdir /mnt/nova-volume $> mount /dev/vdc /mnt/nova-volume
Display some file system details
$> df -h /dev/vdc
Unmount the volume again:
$> umount /mnt/nova-volume
Exit from the ssh session, detach and delete the volume:
$> nova volume-detach testvm aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee $> cinder delete vol-00000001
Expected Results
The file system should be created, mounted and reported correctly by df.
There should be no new errors in the logs:
$> grep -i error /var/log/cinder/*.log