AWS > Storage > Amazon Elastic Block Store (EBS):
EC2 Volumes:
1. Volumes exist on EBS. Think of EBS as a virtual hard disk.
2. Snapshots exist on S3. Think of snapshots as a photo of the disk.3. Snapshots are point in time copies of volumes.
4. Snapshots are incremental - This means that only the blocks that have changed since your last snapshot are moved to S3.
5. If this is your first snapshot, it may take some time to create.
EC2 Snapshots:
1. To create a snapshot for Amazon EBS volumes that serve as root devices, you should stop the instance before taking the snapshot.
1A. However you can take a snap while the instance is running.
2. You can create AMI's from EBS-backed instance and snapshots.
3. You can change EBS volume size on the fly, including changing the size and storage type.
4. Volumes will ALWAYS be in the same availability zone as the EC2 instance.
5. To move an EC2 volume from one AZ/Region to another, take a snapshot or an image of it, then copy it to the new AZ/Region.
Volumes and Snapshots Security:
1. Snapshots of encrypted volumes are encrypted automatically.
2. Volumes restored from encrypted snapshots are encrypted automatically.
Reference:
1. AWS Documentation - Amazon EBS snapshots
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSSnapshots.html
2. Udemy - AWS Solutions Architect - Associate:
https://www.udemy.com/aws-certified-solutions-architect-associate/
最初發表 / 最後更新: 2019.03.17 / 2020.06.09
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