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

1

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

AWS make fake one for exam. you can memrary in
Fight Dr Mc PX

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