Description
Provide nova-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
Ensure the nova-volume service is enabled
$> sudo nova-manage service list
How to test
Create a new 5GB volume
$> euca-create-volume -s 5 -z nova
View status of volumes, and wait for it to become 'available'
$> euca-describe-volumes
Make the storage available to the instance (note -d is the device on the compute node)
$> euca-attach-volume -i i-00000001 -d /dev/vdc vol-00000001
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:
$> euca-detach-volume vol-00000001 $> euca-delete-volume 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/nova/*.log