EC2

Launch Configuration Template Auto Scale Group

The key difference between stopping and terminating an instance is that the attached bootable EBS volume will not be deleted

Elastic Load Balancers

• Application
• Network

Target Groups

Resources groups Tagging

Placement group

• Cluster – Packs instances close together inside an Availability Zone
• Partition – Spreads your instances across logical partitions such that groups of instances in one partition do not share the underlying hardware with groups of instances in different partitions.
• Spread – Strictly places a small group of instances across distinct underlying hardware to reduce correlated failures.

Placement groups are optional. If you don't launch your instances into a placement group, EC2 tries to place the instances in such a way that all of your instances are spread out across the underlying hardware to minimize correlated failures.

Bootstrap script - run when first start instance under root

Network options (virtual network cards)

ENI - Elastic Network Interfaces - for day=to-day Enhancement Networking - SE-IOV - high performance - 10 Gb - 100 Gb EFA - Elastic Fabric Adapter - high performance for machine learning - OS-bypass VF - virtual function interface (old)

ENA vs VF

Spot

Other

https://hkcodeblogs.medium.com/aws-ec2-create-and-connect-to-instance-via-ssh-354a0c1909f https://www.clickittech.com/aws/connect-ec2-instance-using-ssh/