AWS EC2 Contd

• AWS supports two types of block storage (for virtual hard disk storage)
  • Elastic Block Storage:
    • Mounted from a different host in Same AZ
    • This is Persistent Storage (Non Ephemeral)
    • EBS volumes can exist even after ec2 is deleted.
  • Instance Storage
    • Mounted from same host
    • This is volatile Storage (Ephemeral) i.e. shutdown of ec2 will wipe the data adn termination (deletion) of ec2 instance will delete the disks
      
      
• EC2 charges:
  • Charge for instance type
  • Charge for EBS volumes
  • Charge for OS (For some AMIs)
• AWS EC2 mandates all the OS disks should be EBS volumes
• Only few EC2 instance types support instance storage
  

AWS EC2 Lifecycle

• AWS EC2 instance states
  
• Refer Here for official docs on instance life cycle.

EC2 Instance Types

• Instance Family: This is hardware specification of Host (T, C, M etc) and then they have generations (t1, t2,t3, c1, c5)
• Instance Size: Generally this is a multiplication factor
  • nano
  • micro
  • small
  • medium
  • large
  • xlarge
  • 2xlarge
• Instance size also speaks about networking performance
• Refer Here for Purpose based Instance Families