Elastic Compute Cloud
An application in AWS is currently running in the Singapore region. You have been asked to implement disaster recovery for the same. So, if the application goes down in the Singapore region, it has to be started in the Asia region. Your application relies on pre-built AMIs. As a part of your disaster recovery strategy, which of the below points would you consider?
A. Nothing, because all AMIs by default are available in any region as long as they are created within the same account.
B. Copy the AMI from the Singapore region to the Asia region. Modify the Auto Scalinggroups in the backup region to use the new AMI ID in the backup region.
C. Modify the image permissions and share the AMI to the Asia region.
D. Modify the image permissions to share the AMI with another account, then set thedefault region to the backup region.
B. Copy the AMI from the Singapore region to the Asia region. Modify the Auto Scaling groups in the backup region to use the new AMI ID in the backup region.
If you need an AMI across multiple regions, you have to copy the AMI across regions. Note that by default, AMIs that you have created will not be available across all regions. Hence, option A is automatically invalid.
You can share AMIs with other users, but they will not be available across regions. Hence, options C and D are also invalid. You have to copy the AMI across regions.
For more information on copying AMIs, please refer to the URL below.
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/CopyingAMIs.html
