Oracle Cloud Infrastructure Documentation
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Attaching a Boot Volume

If a boot volume has been detached from the associated instance, you can reattach it to the 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.

If a boot volume has been detached from the associated instance, or if the instance is stopped or terminated, you can attach the boot volume to another instance as a data volume. For steps, see Attaching a Block Volume to an Instance.

Required IAM Policy

To use Oracle Cloud Infrastructure, you must be granted security access in a policy  by an administrator. This access is required whether you're using the Console or the REST API with an SDK, CLI, or other tool. If you get a message that you don't have permission or are unauthorized, verify with your administrator what type of access you have and which compartment  to work in.

For administrators: The policy in Let users launch compute instances includes the ability to attach and 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.

Security Zones

Security Zones ensure that your cloud resources comply with Oracle security principles. If any operation on a resource in a security zone compartment violates a policy for that security zone, then the operation is denied.

The following security zone policies affect your ability to attach block volumes to compute instances.

  • The boot volume for a compute instance in a security zone must also be in the same security zone.

  • A compute instance that isn't in a security zone can't be attached to a boot volume that is in a security zone.

Using the Console

  1. Open the navigation menu and click Compute. Under Compute, click Instances.
  2. Click the instance that you want to reattach the boot volume to.
  3. Under Resources, click Boot Volume.

  4. Click the Actions menu (Actions Menu), and then click Attach Boot Volume. Confirm when prompted.

    You can start the instance when the boot volume's state is Attached.

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