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2024년 SAA-C03 자격증 준비하면서 필요한 노트 정리했습니다
강의는 유데미 "Ultimate AWS Certified Solutions Architect Associate SAA-C03" 통해 공부했습니다
https://www.udemy.com/course/aws-certified-solutions-architect-associate-saa-c03
같이 공부해서 합격해보자구요 !
Section 7 : EC2 Instance Storage
55. EBS Overview
- ebs volume - elastic block store - volume is a network drive you can attach to an instance
- it allows your instances to persist data, even after their termination
- they are bound to a specific availability zone
- free tier allows for 30 gb ebs stroage, general purpose ssd
- a network drive, it uses network, there may be a bit of latency
- since it is a network drive, it can be detached and attached to other instances
- it's locked to an availability zone
- if you want to move the ebs, you must perform snapshot and copy it to another az
- ebs can only be connected to one ec2, but ec2 can have multiple ebs attached
- by default, root ebs volume is deleted once ec2 instance is terminated
57. EBS Snapshot
- a backup of ebs volume at a point of time
- can take snapshot and copy them to same or different az region
- there are couple of ebs snapshot features
- snapshot archive - archive tier 75% cheaper, takes 24 ~ 72 hr for restoring
- recyle bin - can recover deleted snapshots, retention from 1day to 1 year
- fast snapshot restore - snapshot with no latency on the first use, but costs a lot of money
59. AMI Overview
- ami = amazon machine image
- ami are a customization of an ec2 instance
- a bit of like docker image
- ami are built for a specific region
- public ami - aws provided
- your own ami - you make and maintain them yourself
- aws marketplace ami - ami made by semeone else and potentially sells
- ami process
- start an ec2 instance
- stop the instance for data integrity
- build an ami
- launch instance from other ami
61. EC2 Instance store
- ebs are network drvie but limited performance
- if you need high performance hardware disk, use ec2 instance store
- better io performance
- lose thier storage if they're stopped
- used for buffer cache temp data
- on exam if very high i/o == local ec2 instance store
62. EBS Volume Types
- ebs volumes 6 types
- gp2 / gp3 (ssd) - gneeral purpose
- io1 / io2 (ssd) - highest performance ssd, low-latency & high workloads
- st1 (hdd) - low cost hdd with intensive workloads
- sc1 (hdd) - lowest cost hdd volume, wil low workload
- only ssd gp2,gp3,io1,io2 can be used as boot volumes
- general purpose ssd
- cost effective storage, low latency
- gp3 - newer version of gp2
- can increase iops up to 16,000 independently
- gp2
- iops are linked together and can increase iops up to 16,000
- gp3 - newer version of gp2
- cost effective storage, low latency
- provisioned iops ssd
- critical business applications
- applications that needs more than 16,000 iops
- great for db workloads
- io1
- max piops 64,000 ~ 32,000
- io2
- max piops 256,000
- io1
- hard disk drives hdd
- cannot be a boot volume
- st1 - throughput optimized hdd
- great for big data, data warehouse, log processing
- sc1 - cold hdd
- for data infrequently accessed
63. EBS Multi-Attach
- io1/io2 family are the only ebs volume that allows for mult-attach to ec2 instances in the same az
- each instance has full read and write permission
- use case
- higher application availability
- manage concurrent write operations
- up to 16 instances at a time ** (시험에 나옴)
64. EBS Encryption
- things that are encrypted when creating ebs volumes are
- data at rest
- all io data
- snapshots
- volumes created from snapshots
- encryption & decryption are handled transparently ( users doe snot have to do anything)
- has limit impact on latency
- ebs encryption leverage keys from kms (aes-256)**
65. Amazon EFS
- efs - elastic file system
- manged nfs (network file system)
- can be mounted on many ec2
- efs works iwht ec2 instances in multi-az
- highly available, scalable, expensive, pay per use
- use cases : content management, wordpress
- compatible with linux based ami(not windows)
- file system scales automatically, its pay per use, do not have to plan ahead
- performance mode
- general default - default, latency sensitive cases
- max io - higher latency
- throughput mode
- bursting
- provisioned - know the throughput that si required, pay for advance
- elastic - good for unpredictable io
- storage tiers (move file after n days )
- standard - frequently accessed files
- infrequent access - cost to retrive files, lower price to store
- archive - rarely accessed data ( 50% cheaper)
- file system type
- regional - multi az
- one zone - one zone (cheaper)
67. EFS vs EBS
- ebs volumes
- one instance (except multi-attach for io1/io2)
- locked at the az level**(시험에 나옴)
- if ebs volume requires migration, perform snapshot and then restore the snapshot at the other az
- root ebs volume gets delete from the instance if instance is terminated
- efs
- network file system
- can be used at multiple az (ebs mount target)
- only for linux instance
기타 질문
- AMI are built for specific aws regions
같이 파이팅해서 합격해봅시당 ㅎㅎ
저는 24년 10월 중순에 시험 볼 예정입니다 ! (후기 남기도록 하겠습니다 후후)
토니이츠얼랏 : 네이버 블로그
너무너무너무 많이 먹는 토니입니당 :) 개발 블로그도 방문해주세용 (제꺼에요 :p) https://tonyzorz.tistory.com/
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