Create_Volume_Chameleon_Openstack_VM.md

Create and attach a Volume in Chameleon Openstack VM.

Backup your data people :)

Step 1:

First, you need to create a volume by going into your respective projects in Chameleon, choosing Volume from Compute Menu and choosing +Create Volume.

Once you have created a volume, attach it to an instance using the drop down menu towards the right and selecting Manage Attachement.

After attaching the Volume, you will get a device name. The device name can be seen under Attached to field.

For example: Attached to Arun_MPI_Learning_Node_3 on /dev/vdb. Here /dev/vdb is the device name. Keep a note of it, we need it in the next step.

Step 2:

Make sure the volume is attached.

sudo file -s /dev/vdb

This command should give you a similar output:

/dev/vdb: Linux rev 1.0 ext4 filesystem data, UUID=49995f73-b1a9-412a-abec-9d6cf4d4d269 (needs journal recovery) (extents) (large files) (huge files)

If you do not get a similar output, you need to create a new file system by formating the volume. To create a new file system:

sudo mkfs -t ext4 /dev/vdb

Step 3:

Create a new folder to mount the volume.

sudo mkdir /mount_point

Step 4:

Backup and copy new lines to /etc/fstab

sudo cp /etc/fstab /etc/fstab.orig

Open /etc/fstab in a text editor (sudo vi /etc/fstab for example) and add this line.

/dev/vdb       /mount_point   ext4    defaults,nofail        0       2

Step 5:

Mount the volume and give proper rights

mount -a
sudo chown $USER:$USER -R /mount_point

Step 6:

Confirm volume by creating a test file in it.

touch /mount_point/testing_volume.txt
cd /mount_point/
ls