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

Attaching Volume

Web Interface

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

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Command-Line

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

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$ openstack server add volume 6b2bedc4-9d8e-4bf3-be63-1dd49bc2e188 2d61791d-5f52-46e1-81ac-05221c308fe8 --device /dev/vdb
+-----------+--------------------------------------+
| Field     | Value                                |
+-----------+--------------------------------------+
| ID        | 2d61791d-5f52-46e1-81ac-05221c308fe8 |
| Server ID | 6b2bedc4-9d8e-4bf3-be63-1dd49bc2e188 |
| Volume ID | 2d61791d-5f52-46e1-81ac-05221c308fe8 |
| Device    | /dev/vdb                             |
+-----------+--------------------------------------+

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): 

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   sudo mkfs.ext4 /dev/vdb

   
   

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

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   $ 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)

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   sudo mkdir /mnt/test-volume

   
   

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

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   sudo vim /etc/fstab

   
   

6. Add/edit the following line: 

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

   
   

7. You still need to manually mount it now 

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   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

   
   

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   chmod