AWS认证准备-a Cloud Guru笔记 2, EC2 and EBS

EC2 101

EC2 Options

  • on demand (by seconds/hours), fixed rates
  • reserved, 1 or 3 years term
  • spot, users can bid whatever price you want for instance capacity
  • dedicated hosts (able to use existing server bond software license to save money)
  • https://aws.amazon.com/ec2/pricing/

On Demand

  • application with short term, spiky or unpredicable workloads
  • app tested on EC2
  • perfect for users who want low-cost and flexibility without any up-front payment or unpredictable workloads

Reserverd Instances (RI)

  • apps with steady states or predictable usafe (like web server)
  • appws required reserved capacity
  • standard up to 75% discount
  • convertible up to 54% discount
  • schedules RIs (every friday, every December)

    spot instances

  • apps with flexile start and end times
  • apps that are only feasible可行 at very low compute prices
  • users with urgent need for large amount of additional computing capacity
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if it is terminated by AWS, you will not charged by partial hours, but if you do, the whole hours will be charged

Dedicated Hosts

  • for regularoty requirements that may not support multi-tenant virtualization
  • licensing which does not support multi-tenancy or cloud deployment
  • can be purchased on demand or reserved (up to 70%)

Types

not require memorary

Screen Shot 2018-12-02 at 7.47.57 AM.jpg

AWS make fake one for exam. you can memrary in
Fight Dr Mc PX
Screen Shot 2018-12-02 at 7.53.11 AM.jpg

EBS

  • in a spercific AZ
  • storage volumes attached to your EC2, when attached, you can create file system on it, run a db or as a block

EBS Types

SSD

  • GP2 /General Purpose SSD
    • balance price and performance
    • ratios of 3 IOPS per GB with up to 10,000 IOPS and the ability to boost 3000 IOPS for extended periods of time for volumes at 3334 Gib and above
  • IO1 / Provisioned IOPS SSD
    • for I/O intensive apps, large relational db/NoSQL db
    • use it if you need more than 10,000 IOPS

Magnetic

  • ST1 / Throughput Optimized HDD
    • big data
    • data warehouse
    • log processing
    • cannot be a boot volumen
  • SC1 Cold HDD
    • lowest cost for IA workload
    • file server
    • cannot be a boot volumen
  • Standard / Magnetic

  • lowest cost per gb of all EBS which is bootable
  • ideal for workloads that data is IA and apps want low cost

EC2 Instance

  • one subnet one AZ
  • default monitoring is every 5 minutes, 1 minute cloudwatch detailed is charged
  • security group is a firewall A security group is a set of firewall rules that control the traffic for your instance.
  • default user is ec2-user

Security Group

  • any update of security group, it work immediately
  • security groups is stateful, when you add an inbound rule, out bound rule will work too (vpc network rules are not, they are stateless, add one inbound, u have to add one outbound too)
  • you cannot block IP, not like vpc network ACL
  • All port default is block, add it as a rule to allow, all outbound is allowed defaultly
  • an instance can have many security groups, a group can have many too
  • you cannot deny rules

EBS Elastic Block Store

  • standard we cannot modify volume
  • ec2 instance and EBS volume are in the same AZ
  • Use snapshot to transfer to another AZ
  • create snapshot -> copy to another region to move by region

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