AWS launch new instance using Ubuntu 22.04:

The selected AMI contains more instance store volumes 
than the instance allows. Only the first 0 instance
store volumes from the AMI will be accessible from the 
instance

What does it mean? does an AMI have volumes?

CodePudding user response：

EC2 instances can have two basic types of volumes: EBS (Elastic Block Store) and Instance Store. This article spells out the differences, but in a nutshell, EBS volumes are network attached storage that are independent of an instance, while Instance Store volumes are local block storage volumes that are not persistent (e.g. when the instance is terminated, the instance store volume is lost).

You ask if an AMI has volumes. An AMI basically is one or more volumes. The AMI is a snapshot of a disk in a particular state. These days, most modern AMIs use EBS storage for the root volume; that is, the volume that contains the operating system kernel that an instance boots from. It used to be commonplace to use Instance Store for the root volume, but EBS has become nearly as fast, more secure, and more reliable than Instance Store, so the use cases for Instance Store volumes are dwindling.

With all that said, I'm quite surprised that you're seeing this error. The error message suggests that the AMI includes Instance Store but the instance type you selected does not support Instance Store (many instance types do not). However, all Ubuntu 22.04 AMIs use EBS, not Instance Store. If you use the Ubuntu Amazon EC2 AMI Locator and search for "22.04", you'll find that all of the results have hvm:ebs-ssd as the instance type. Only very old Ubuntu AMIs have Instance Store volumes.

Make sure you are using the AMI Locator to find the Ubuntu 22.04 AMI. Those AMIs should work with most or all EC2 instance types.