Developing modern applications in cloud

  EC2 - Elastic Compute Cloud Resizable compute capacity Pricing models On demand Low, flexible, no upfront cost Suitable for short term spike Reserved Suitable for steady state Pricing Standard reserved instance - 75% cheaper Convertible reserved instances - 54% cheaper Scheduled reserved instances SPOT For application have low compute usage Upto 90 % cheaper compared to on DEMAND Flexible start and end time You are not charged for the hour if AWS terminates your instance but are charged if you terminate the instance Suitable for fault tolerant or HPC application where downtime on short notice is acceptable. You get 2 minutes notice before an instance is terminated SPOT blocks stops an instance from being termina...

S3 is a simple key based object store. S3 has globally unique namespace i.e. bucket name has be unique across all region but S3 bucket is created in a region. The data is stored on multiple devices spanning at least 3 AZs S3 has three URL scheme Global (legacy) Virtual Domain Based Path Based File size 0 bytes to 5 TB. Largest PUT 5GB Successful uploads produces a HTTP 200 Consistency Read after write for PUTS of new objects Eventual consistency for overwrites PUTS and DELETES S3 as objects and has following properties Key Value Version id Metadata Sub resources Access control list Torrents 99.99% availability, Amazon guarantees 99.9% and  99.999999999% durability (unlikely it will be lost) Tiered storage Standard S3 - IA S3 - one Zone - IA S3 - Intelligent Tierin...