EBS

Overview

• An EBS (Elastic Block Store) Volume is a network drive you can attach to your instances while they run

• It allows your instances to persist data, even after their termination

• They can only be mounted to one instance at a time (at the CCP level)

• They are bound to a specific availability zone

• Analogy: Think of them as a “network USB stick”

• Free tier: 30 GB of free EBS storage of type General Purpose (SSD) or Magnetic per month

EBS Volume

• It’s a network drive (i.e. not a physical drive)

  • It uses the network to communicate the instance, which means there might be a bit of latency

  • It can be detached from an EC2 instance and attached to another one quickly

• It’s locked to an Availability Zone (AZ)

  • An EBS Volume in us-east-1a cannot be attached to us-east-1b

  • To move a volume across, you first need to snapshot it

• Have a provisioned capacity (size in GBs, and IOPS)

  • You get billed for all the provisioned capacity

  • You can increase the capacity of the drive over time

EBS – Delete on Termination attribute

• Controls the EBS behavior when an EC2 instance terminates

  • By default, the root EBS volume is deleted (attribute enabled)

  • By default, any other attached EBS volume is not deleted (attribute disabled)

• This can be controlled by the AWS console / AWS CLI

• Use case: preserve root volume when the instance is terminated

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