EBS

Question 1

What is EBS?

Answer 1

Is a network drive that you can attach to your instances while they run, allowing instances to persist data, even on termination. An EBS is locked to an AZ

Question 2

If you want to keep the data of a EC2 instance even after termination, what you need to do?

Answer 2

Disable the default delete on termination behavior on EBS.

Question 3

How can you bring an EBS from an AZ to another?

Answer 3

You can make a snapshot of the EBS, that will copy all data in it, and move it to the other AZ

Question 4

What are some features of EBS snapshots?

Answer 4

You can move to an “archive tier”, where it takes 24 to 72 hours to restore, but is cheaper.

There is a recycle bin, where the snapshot is retained even after deleted. Retention period is configurable

Fast Snapshot Restore - force full initialization of snapshot

Question 5

What is AWS AMI?

Answer 5

AMI is a customization of a EC2 instance. You can add your own software, monitoring, etc…

It is possible to create an AMI of a running instance

Question 6

What is a good case to use EC2 instance store?

Answer 6

When you need better I/O performance, since the disk is attached to the instance, there is no network latency.

When the data is ephemeral. When the instance is terminated, the data is lost

Question 7

What are the 3 EBS volume types?

Answer 7

• General Purpose SSDs: cost effective storage, low-latency
• Provisioned IOPS: great for database workloads, sustained IOPS performance
• HDD

Question 8

Is it possible to attach a single EBS volume to many EC2 instances?

Answer 8

Yes, using EBS multi-attach, since the EC2 instances are in the same AZ.

Question 9

What if you want to access the same data over EC2 instances that are in different AZs?

Answer 9

You can use EFS (Elastic File System), it is a managed NFS, that allows to mount the same file system on many EC2 over different AZs