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:
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.
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The following output is generated:
- 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:
- 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.
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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.