Oracle Cloud Infrastructure Documentation

Attaching a Boot Volume

If a boot volume has been detached from the associated instance, or if the instance is stopped or terminated, you can attach it to another instance as a data volume. The steps are the same as the steps for attaching a block volume, see Attaching a Volume.

You can also reattach a boot volume to the associated instance. If you want to restart an instance with a detached boot volume, you must reattach the boot volume using the steps described in this topic.

Required IAM Policy

To use Oracle Cloud Infrastructure, you must be given the required type of access in a policy  written by an administrator, whether you're using the Console or the REST API with an SDK, CLI, or other tool. If you try to perform an action and get a message that you don’t have permission or are unauthorized, confirm with your administrator the type of access you've been granted and which compartment  you should work in.

For administrators: The policy in Let users launch Compute instances includes the ability to attach/detach existing block volumes. The policy in Let volume admins manage block volumes, backups, and volume groups lets the specified group do everything with block volumes and backups, but not launch instances.

If you're new to policies, see Getting Started with Policies and Common Policies. For reference material about writing policies for instances, cloud networks, or other Core Services API resources, see Details for the Core Services.

Using the Console

  1. Open the navigation menu. Under Core Infrastructure, go to Compute and click Instances.
  2. In the Instances list, select the instance you want to attach the boot volume to.
  3. Click the name of the instance to display the instance details.
  4. In the Resources, click Boot Volume.
  5. Click the Actions icon (three dots) for the boot volume.
  6. Click Attach and confirm the selection when prompted.

    You can start the instance once the boot volume's icon no longer lists it as ATTACHING. For more information, see Stopping and Starting an Instance.

Using the API

To attach a volume to an instance, use the following operation:

For information about using the API and signing requests, see REST APIs and Security Credentials. For information about SDKs, see Software Development Kits and Command Line Interface.