AMI

• AMIs are regional. So same Image will have different ID in each region
• Permissions can be either Public, Your Account i.e. Private or Specific Accounts
• When an AMI is created snapshots of EBS volumes attached to it are created. A block device mapping is created that links snapshot id with a device id.
• When a new instance is launched from AMI, snapshots are used to create new EBS volumes in the AZ where the instance is being launched. They are connected to the device id based on block device mapping.
• AMI can't be edited or updated