Cloud Computing

• CC is the On Demand delivery of IT resources over the internet

• Ensure Availability set in order that the instances are grouped and declared as set, otherwise in case of failure all the instances goes down

• Read more - Jump host, VPC and VPN

Types

• SAAS
  • Ex: Gmail, Trella, Google Docs - for end users

• PAAS
  • Heroku, AWS Elastic Beanstalk, Google App Engine - for Software developers
  • Suitable for small projects

• IAAS
  • AWS EC2, Azure, Google Cloud Computing

Benefits / Characteristics of CC

• Resource Pooling

• On Demand Self Service

• Easy maintenance

• Scalability and rapid elasticity

• Economical

• Measured and reporting service
  • Get alerts
  • Proactive notification

• Security

• Automation

• Resiliency and Availability
  • In case of disasters of any resources, it can be backed up and restored

• Large network access

Widely available thru geographical zones

• Zones are nothing but different data centres which are unique with having different power supply and other needs, meaning each does not have any shared resources to operate

Cloud Infrastructure Services

1. VMs
   1. Hyper Viser - read more on this
   2. Different types - General purpose, memory optimised, IO optimised

2. Object storage

3. Private network
   1. Subnets
   2. NAT gateway

4. IAM

5. Firewall

6. Load Balancer
   1. Application and Network Level
   2. Default algorithm for load balancer
      1. Read more on this
         1. Ex: Source IP and port - Destination IP and port → Hash both

7. CDN
   1. Distributed caching
   2. Offered by AWS CloudFront
   3. Read more - Redis cache

8. DNS
   1. Domain management

9. Database Service
   1. COU, Memory storage, backups, patch management
   2. Read about - RDS, RDO and RPO
   3. Read about - COSMOS DB which is offered by AWS
   4. Links
      1. Choosing the right database for your RTO and RPO requirements
      2. Implementing a disaster recovery strategy with Amazon RDS
      3. What’s the real RPO for databases on AWS RDS and why you’re probably wrong?

10. NOSQL
    1. Fully Managed, Serverless, point in time recovery