Attaching and ccessing Volumes to an instance

You can only attach a volume to one instances at a time.

Web Interface

Click the drop-down menu on the right hand side (in Actions column) and select MANAGE ATTACHMENTS

Select the right instance and press ATTACH VOLUME

Note the path in the Attached To column of the volume

Command-Line

Get the Server ID (Instances) and Volume ID (Volume) using command

Run

Accessing the volume

1. Log-in to the attached instance using SSH

2. (Optional only for new volume) Format the volume (we use ext4 here and assume the attach point is /dev/vdb) (Formatting will wipe your data): 

   sudo mkfs.ext4 /dev/vdb

3. Use lsblk to confirm the device path (usually type disk). The value shown in OpenStack can be inaccurate.

   $ lsblk
   
   NAME    MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
   loop0     7:0    0 73.1M  1 loop /snap/lxd/21902
   loop1     7:1    0 55.4M  1 loop /snap/core18/2128
   loop3     7:3    0 72.6M  1 loop /snap/lxd/21750
   loop4     7:4    0 61.9M  1 loop /snap/core20/1169
   loop5     7:5    0 32.5M  1 loop /snap/snapd/13640
   loop7     7:7    0 42.2M  1 loop /snap/snapd/14066
   loop8     7:8    0 55.5M  1 loop /snap/core18/2253
   loop9     7:9    0 61.9M  1 loop /snap/core20/1242
   sr0      11:0    1  470K  0 rom  /mnt/context
   vda     252:0    0   20G  0 disk
   ├─vda1  252:1    0 19.9G  0 part /
   ├─vda14 252:14   0    4M  0 part
   └─vda15 252:15   0  106M  0 part /boot/efi
   vdc     252:32   0    3G  0 disk

4. Mount the volume (we use the folder /mnt/test-volume as example)

   sudo mkdir /mnt/test-volume

5. Add this mount point to /etc/fstab, so it will be mounted automatically on startup 

   sudo vim /etc/fstab 

6. Add/edit the following line: 

   /dev/vdb /mnt/test-volume ext4 defaults 0 0

7. You still need to manually mount it now 

   sudo mount /mnt/test-volume

8. (Optional)You may also want to change the permission of the directory using chmod to enable read/write without sudo

    chmod