How can I find the INSTANCE_ID from a provisioned machine?

Question

How can I find the Instance ID referred to by Cloud-Init as provided by OpenStack?

Answer 1

You can run,

cloud-init query instance_id

Or, you can find the INSTANCE_ID, by looking in this file,

/var/lib/cloud/data/instance-id

Or, this one

/run/cloud-init/.instance-id