Performing a Diagnostic Reboot
Use a diagnostic reboot to rebuild an unreachable compute virtual machine (VM) instance when other troubleshooting steps aren't successful.
During a diagnostic reboot, the instance is stopped, rebuilt, and restarted. A short downtime occurs during the reboot process. Instance properties such as private and ephemeral public IP addresses, attached block volumes, and virtual network interface cards (VNICs) are preserved.
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 perform a diagnostic reboot on an instance. If the specified group doesn't need to launch instances or attach volumes, you could simplify that policy to include only
manage instance-family, and remove the statements involving
Before You Begin
All VM shapes except shapes in the dense I/O series support diagnostic reboots.
Using the Console
- Open the navigation menu and click Compute. Under Compute, click Instances.
- Click the instance that you're interested in.
- Click More Actions, and then click Send diagnostic reboot.
- Review the confirmation message and then click Send diagnostic reboot.
Using the API
Use the InstanceAction operation, passing the value
DIAGNOSTICREBOOT as the action to perform.
Using the CLI
Open a command prompt and run the instance action command:
oci compute instance action --action DIAGNOSTICREBOOT --instance-id <INSTANCE_OCID>