EC2 Advanced

EC2 Advanced

Key Management Service (It’s a regional service)

• AWS Managed keys
  • AWS managed, least freedom since AWS managed.
• Customer managed keys
  • Customer managed
  • More control and can do key rotation etc.

EC2 performance are controlled by:

1. EBS-optimized
2. Enhanced Networking
   • Enhanced networking using SR-IOV.
3. Placement groups - there are 3 types of Placement Groups
   • Cluster PG
     • Purely designed for performance
     • One AZ ONLY.
     • EC2 are physically close together.
   • Partition PG
     • Maximum application availability
     • Partition Placement Groups reside inside AZ. One more more PPG can reside in AZ
     • Multiple AZ for Partition PG based EC2.
     • Single region and multiple AZs
   • Spread PG
     • Purely for availability
     • Max 7 instances / AZ
     • Email services.

Different Billing Models

1. On demand billing
   • 60second usage
   • Type and size of instance including region that’s launched in.
   • Use when
     • Default or unknown load
     • Anything between reserved / spot
     • Short term workloads that can’t tolerate interruption
2. Spot billing
   • Spare capacity may be available in AWS based on the region and AZ
   • Bid for the spot price and if you get , you will be able to launch EC2 instance.
   • Instances can be terminated though.
   • Spot prices can go up and down.
   • When will you pickup spot price?
     • If the work is not time critical and termination of instance is NOT an issue for your app, 
one can use spot instances.
     • If apps can’t withstand failure, do NOT use spot instances.
   • When to use?
     • Bursty workloads
     • Cost-critical, which can cope interruption.
3. Reserved Instances
   • Commitment for 1 or 3 years.
   • Instance reservation you will pay for irrespective of running, stopped or terminated state of the EC2.
   • Regional reservation , flexibility on type of EC2 on what you reserved.
     • Gives flexibility.
   • Zonal reservation , the type of EC2 is fixed on what you have reserved.
     • Gives capacity.
   • When to use?
     • Base/consistent load
     • Known and understood growth
     • Critical systems / components.