Mount Cinder Volume to OpenStack Instance

Step 1:  Create Volume in OpenStack (Can be completed in GUI)
  CLI:
    cinder create SIZE_IN_GB --display-name NAME
    cinder create 10 --display-name mystorage
    cinder list

Step 2: Attach volume to Openstack instance (Can be completed in GUI)
  CLI:
    nova volume-attach INSTANCE_ID VOLUME_ID auto
    nova volume-attach myhost f14e47ab-18f6-4f85-bd17-a3f63a38d609 auto

Step 3: SSH into Instance and type:
    lsblk
    
    NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
    vda 253:0 0 50G 0 disk
    └─vda1 253:1 0 50G 0 part /
    vdb 253:16 0 1G 0 disk
    
Step 4: Format vdb and mount...
  CLI:
    sudo mkfs.ext4 /dev/vdb
    sudo mkdir /extstore
    sudo mount /dev/vdb /extstore/
    df -h


OPTIONAL:
Step 5: To unmount
  CLI:
    umount /extstore  #(your mount point)