Attaching and accessing Volumes to an instance

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

Attaching Volume

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

1.	Click the drop-down menu on the right hand side (in `Actions` column) and select `MANAGE ATTACHMENTS`
2.	Select the right instance and press `ATTACH VOLUME`
3.	Note the path in the `Attached To` column 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):
```
sudo mkfs.ext4 /dev/vdb
```

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

Mount the volume (we use the folder /mnt/test-volume as example)
```
sudo mkdir /mnt/test-volume
```
Add this mount point to /etc/fstab, so it will be mounted automatically on startup
```
sudo vim /etc/fstab 
```

Add/edit the following line:

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

You still need to manually mount it now
```
sudo mount /mnt/test-volume
```
(Optional)You may also want to change the permission of the directory using chmod to enable read/write without sudo
```
 chmod
```