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Attaching volumes to an instance – OpenStack

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by Ruchitha Geebu
Last modified: March 27th 2021

This procedure details the steps involved in attaching a Cinder volume to an existing to compute instance using the cinder and nova command-line interfaces.
Now that we have a usable volume, we can attach this to any instance. We do this by using the nova volume-attach command in Nova Client.

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To begin with, assure that you are logged into the Ubuntu client that has access to the Nova Client tools. These packages can be installed using the following command:

Getting ready

Steps to Attach Volumes to an Instance using Nova Client

Carry out the following steps to attach a volume to an instance using Nova Client:

  • If you have no instance running, spin one up. Once running, run the nova list command and note the instance ID.

instance ID

The following output is generated:

instance ID 1

  • Using the instance ID, we can attach the volume to our running instance, as follows
  • The preceding command will output the name of the volume when successful. To view this, log in to your running instance and view the volume that is now attached:   

 view the log                                                                                                                                                                                                                                                                                                           

  • We should see 1 GB of space available for the running instance. As this is like adding a fresh disk to a system you need to format it for use and then mount it as part of your filesystem.

adding a fresh disk

                                                                                                                                                                                                                                                                                                              Related Pages: Openstack Tutorial

Attaching a Cinder-Volume

Attaching a cinder-volume is no different from plugging in a USB stick on your own computer—we attach it, (optionally) format it, and mount it.
Under Nova Client, the option volume-attach takes the following syntax:

nova volume-attach instance_id volume_id device

instance_ id is the ID returned from the nova list for the instance that we want to attach the volume to. The volume_id is the name of the device within the instance that we will use to mount the volume that can be retrieved using nova volume-list. This device is the device that will be created on our instance that we use to mount the volume.

 

 

 

 

About Author

author
NameRuchitha Geebu
Author Bio

I am Ruchitha, working as a content writer for MindMajix technologies. My writings focus on the latest technical software, tutorials, and innovations. I am also into research about AI and Neuromarketing. I am a media post-graduate from BCU – Birmingham, UK. Before, my writings focused on business articles on digital marketing and social media. You can connect with me on LinkedIn.