AWS EBS

  • An EBS(Elastic Block Store) volume is a network drive, we can attach to our instances while they run.
  • It allows our instances to persist data, even after termination.
  • They can be attached/mounted to one instance at a time. However, some EBS have multi attach feature.
  • It is bound to a specific availability zone.
  • They are a sort of network USB stick.
  • It is a network drive
    • It uses network to communicate with the instance, so there might be a bit of latency.
    • It can be detached from an EC2, instance and Attached to another one Quickly.
  • It is locked to an availability zone.
    • An EBS volume in us-east-la Cannot be attached to us-east-lb.
    • To move a volume across, We first need to snapshot it.
  • We have to provision capacity in Advance(Size in GB, and IOPS).
    • We get billed for all the provisioned capacity.
    • We can increase the capacity of drive overtime.
  • EBS – delete on termination attribute
    • We set this attribute during EBS creation.
    • Controls the EBS behaviour When our EC2 instance Is terminated.
    • By default, it is set for root volume and unset for any EBS volume attached to instance.
    • By default, the root EBS volume is deleted(attribute is enabled).
    • By default, any other attached, EBS volume is not deleted(Attribute is disabled)
    • We can control by enabling/disabling delete on termination for EBS volumes.
    • We can disable delete on termination for root volume thus When instance is terminated, volume will not be deleted.

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