AWS Classroomnotes 11/Nov/2022

AWS Elastic Block Storage Contd..

• Installing necessary softwares on Windows 10 and above Refer Here

Backup of Volume => Snapshot

• In AWS first backup is full backup and backups from there are incremental.
  
• What happens when we delete the latest backup
  
• What will happen if we delete the first backup
  
• When we want to delete the snapshot, AWS will check if the snapshot to be deleted is referenced by some other snapshots
  • if yes the contents of snapshots will be copied to snapshot refering this. In this case there is no data loss
  • if no then the snapshot will be deleted. In this case there is data loss.
• Now Generally organizations, configure automated backups periodically (once every day/hour/week). In these situations we can also configure to delete the older snapshots as it doesnot cause data loss.
• Lets create a snapshot
  
  
  
• From snapshot we can
  • create an ebs volume
    • in different az
    • in differnt region: This can be achieved by copy snapshot to other region and create a ebs volume from there
  • Create an AMI (Amazon Machine Image):
    • AMI is snapshot plus metadata
• Exercise:
  • Create an ubuntu instance.
  • Install docker and add ubuntu user to docker group
  • Stop the ec2 instance
  • Create a snapshot from EBS root volume.
  • Now delete the ec2 instance
  • Create a ec2 AMI with docker preinstalled from the snapshot we created.