Attaching and Accessing Volumes to an instance
- Chung, Donald (STFC,RAL,SC)
- Chris Green
You can only attach a volume to one instance at a time.
Attaching Volume
Web Interface
Click the drop-down menu on the right-hand side (in
Actionscolumn) and selectMANAGE ATTACHMENTSSelect the right instance and press
ATTACH VOLUMENote the path in the
Attached Tocolumn of the volume
Command-Line
Get the Server ID (Instances) and Volume ID (Volume) using command
$ openstack server list
+--------------------------------------+--------------------------+--------+----------------------------------------+---------------------------------------------------------+--------------+
| ID | Name | Status | Networks | Image | Flavor |
+--------------------------------------+--------------------------+--------+----------------------------------------+---------------------------------------------------------+--------------+
| 6b2bedc4-9d8e-4bf3-be63-1dd49bc2e188 | test-resize-rebuild | ACTIVE | Internal=172.16.102.207 | ubuntu-focal-20.04-gui | c3.small |
+--------------------------------------+--------------------------+--------+----------------------------------------+---------------------------------------------------------+--------------+
$ openstack volume list
+--------------------------------------+-------------------+-----------+------+-----------------------------------+
| ID | Name | Status | Size | Attached to |
+--------------------------------------+-------------------+-----------+------+-----------------------------------+
| 2d61791d-5f52-46e1-81ac-05221c308fe8 | test-cli-snapshot | available | 3 | |
+--------------------------------------+-------------------+-----------+------+-----------------------------------+Run
openstack server add volume <server-id> <volume-id> --device <device-name>$ 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
Log-in to the attached instance using SSH
(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):Use
lsblkto confirm the device path (usually typedisk). The value shown in OpenStack can be inaccurate.Mount the volume (we use the folder
/mnt/test-volumeas example)Add this mount point to /etc/fstab, so it will be mounted automatically on startup
Add/edit the following line:
You still need to manually mount it now
(Optional)You may also want to change the permission of the directory using
chmodto enable read/write withoutsudo