[SAA + SAP] 03. EC2

SAA

EC2 instance types

 

Security Group

SG can refer to another SG.

 

EC2

• You have more access to hareware
• Whole hardware for your EC2

• Still share hardware with other instances

 

• To start a spot instance, you need to issue a Spot Request.
• Spot request contains the information
  • Max price
  • Num of Instances
  • Specification
  • Type: One-time | presistent
  • Time range
• As long as current spot price < Max price, instances keep running
• Otherwise, will stop or terminate instance in 2 mins grace period
• Or using Spot block strategy

• If one-time type, will terimated instances in the end.
• Must firsts cacnel the Spot Request first, then terminate the instances, otherwise, for persisten type, it will "stop" -> "start" -> "according to spot request" -> "lanuch instances" again.
• You cannot cancel "failed" or "closed" instances

• Launch spot instances and on-demand instances to meet target capacity.

• Start/stop EC2, public IP will change, use Elastic IP to avoid this problem
• Recommended to use a random Public IP and register a DNS name to it.
• Or use a Load Balancer are ofter a better choice.

 

EC2 Placement Group

• Sometime you want to control over the EC2 insstnaces placement strategy (to achieve low-latency or aviliability)
• That strategy can be defined using placement groups
• You can move an instance into or out of a placement Group
  • You first need to stop the instance
  • You then need to use CLI (modify-instance-placement)
  • You can then start your instance

• Note: Choose instance type that has Enhanced Netowrking (because they have faster networking capbility)
• Put all EC2 in the same Rack
• To get Low latency network
• For big data job

• Spread: accross AZ, limited 7 instance per AZ
• For reduce risk of simultaneous failure
• For Critical application

• Partition: Each partition pan access multi AZ in same region
• Up to 100 instances
• For Kafka, HDFS...

• Can attach to EC2 instances for failover
• Bound to a specific availability zone

• preserve the state in EBS
• reduce bootstrap time compare to stop instances

 

EC2 Nitro

• Underlying Platform for the next generation of EC2 instances
• New virtualization technology
• Allow for better performance:
  • Better networking options (enhanced networking HPC, IPv6)
  • Higher Speed EBS (Nitro is necessary fro 64,000 EBS IOPS - max 32,000 on non-Nitro)
• Better underlying security

If you want High Speed EBS, you have to use EC2 Nitro instance.

 

vCPU

• Core has Thread inside

• You can reduce some vCPU to reduce some costs

 

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SAP

• Host affnity for Dedicated host, when the instance reboot, it will stay on the same host; won't jump to another hardward

 

• R for RAM
• C for Compute
• M for Web, Medium
• I for I/O
• G for GPU machine learning

• Status check for EC2 VM and system
• RAM is not included in EC2 metrics, need to use Custom metrics

 

• Focus on capacity, can mix the instance types