Aug 29, 2022 - AWS Udemy SAA-C02 #3

 

EBS Volume(elastic block store)

-ec2와 종료와 관계 없이 데이터 계속 보존됨

-one can be mounted to one instance at a time

 

-network drive -> a bit of latency

-AZ 단위로 움직이기에, snapshot을 활용해야만 다른 AZ로 갈 수 있음.

-delete on termination 옵션에 체크해놓으면 함께 삭제됨

-하나의 ec2에 2개 이상의 EBS 장착 가능

 

EBS Snapshots(backup)

-다른 AZ에 있는 데이터를 스냅샷으로 타 AZ로 가져올 수 있음.

-ebs snapshot archive를 이용하면 75% 정도 싼 비용으로 복원할 수 있지만, 추후 복구 시간이 24~72시간까지 소요된다.

-recycle bin for ebs snapshot을 사용하면 실수로 삭제한 snapshot을 복원할 수 있음. 본 기능에 retention period를 설정해놓으면 된다.(1일~1년). create retention rule을 통해 설정 가능.

-create volume from snapshot ->new cloned EBS

 

AMI(amazon machine image)

-customization of an EC2 instance, software, configuration, OS, monitoring-> faster boot, config time save

-public AMI, own AMI, marketplace AMI

-userData란에 기본 세팅 해야할 cmd 기입하여 필수 모듈 최초에 잡아주면됨!!

 

EC2 Nitro

-next generation of EC2 instances

-IOPS(input output operations per second)

 

vCPU

-4cpu + 2 threads per CPU -> totally 8vcpu

-HPC(high performance computing) -> one thread per core!

 

Quiz

Elastic IP is a public IPv4 that you own as long as you want and you can attach it to one EC2 instance at a time.

 

Spot Fleet is a set of Spot Instances and optionally On-demand Instances. It allows you to automatically request Spot Instances with the lowest price.

 

Cluster Placement Groups place your EC2 instances next to each other which gives you high-performance computing and networking.

 

Spread Placement Group places your EC2 instances on different physical hardware across different AZs.

 

Elastic Network Interfaces (ENIs) are bounded to a specific AZ. You can not attach an ENI to an EC2 instance in a different AZ.

 

To enable EC2 Hibernate, the EC2 Instance Root Volume type must be an EBS volume and must be encrypted to ensure the protection of sensitive content.