An AWS certification question asks how you’d authenticate a mobile app. The answer is Web Identity Federation to login.
You then get a Secure Token from AWS STS and use an IAM policy.
See also: https://docs.aws.amazon.com/cognito/latest/developerguide/what-is-amazon-cognito.html
Consolidated Billing is used to consolidate payments for multiple AWS accounts.
The master account:
- pays the charges for all the member accounts
- can see a combined view of the charges incurred by the member accounts
- can get a cost report for each member account
Newly created EBS volumes do not need any pre-warming and are available at peak performance from creation.
However volumes created from snapshots need to be pre-warmed using something like:
sudo dd if=/dev/xvdf of=/dev/null bs=1M