Cloud Architecture (Unit 1)

Cloud Architecture - Unit 1 - CA - SRMIST Syllabus - Short Notes

Internet vs Cloud

Cloud

Definition Points (Characteristics)

• On-Demand - Provide Service when needed.
• Pay-as-you-go pricing - Pay only for services you use.
• Broad Network Access - Resources from any device - phone, laptop, tab, etc.
• Scalable  - More customers do not affect efficiency.
• Resource Pooling - Resources that are idle are all considered for cloud resources pool.

Components

• Client Computers
• Thick Clients
• Thin Clients
• Data Center
• Distributed Servers
  

Convergence 

Resource Sharing

• Compute - Processing workload.
• Storage - Save & Store data.
• Database - Storage of structured & unstructured data sets.
• Network - Provide connectivity to every other resource type.

Deployment Model

• Private - VPC externally or internally hosted for a specific organization or group.
• Public - Externally hosted for anyone to use.
• Hybrid - A combination of all other models (usually used in IT companies)
• Community - Hosted for the exclusive use of a community. (private<community<public)
  
  
  

Service Model

• SaaS
• PaaS
• IaaS 

Enabling Techniques

• Grid Computing - Distributed set of computing.
  
  
  
• Utility Computing - Pay as per services used.
  
  
  
• Internet - Connectivity of the cloud service on a global scale.
• Multi-tenancy - Multiple users can use the service at the same time.
  
  
  
• Web 2.0 -  World Wide Web
• SOA - Architecture based on services.
• Automation - Without human intervention or hindrance.
• Virtualization - Splitting hardware or software resources for multiple instances.
• Hardware
• Software
• Full
• Para
  
  
  

Benefits

• Profitable - Pay as you go, which makes it cost-effective.
• Scalable - More users won't make it less effective.
• Accessibility - Available around the world, either on a phone or PC, or laptop.
• Security - Encryption methods to safeguard data.
• Productivity - Less downtime, more productivity.
• Round-the-clock service - Reason for less downtime.
• Latest Software - Better software for execution.
• Speed - Accessible almost instantly.
• Teamwork - Less time spent on planning finance for required resources.

Challenges

• Security - Open-source leads to vulnerable data.
• Management of speed - Cloud can be expensive with improper management. 
• Lack of expertise - Not enough cloud experts.
• Governance - Native governance laws as it is in their initial stages yet,
• Compliance - Flexibility of movement from cloud to cloud.
• Managing multiple clouds - Hybrid cloud management becomes an issue.
• Performance Levels - Multi-tenancy must not be an issue.
• Building VPC - Hard to build a dedicated VPC.
• Portability - Migration to other CSPs (Cloud Service Providers) must be easy.
• Service Quality
• Interoperability
• Availability & reliability

Cloud Architecture

Benefits

• Solves latency issues
• Reduces cost of operation 
• Easy to scale up business
• Flexibility feature
• Better disaster recovery
• Up-to-date services
• Remote working & team-collaboration

Challenges

• Service Availability
• Data Privacy
• Bottlenecks
• Distributed Storage
• Scalability
• Reputation Sharing

Cloud Applications

• Availability - Uptime, Cost, Single point failure, Scalability.
• Performance - Load balancer, auto scale, correct instances, etc.
• Security - CIA, authentication, encryption, etc.
• Disaster Recovery - RTO, RPO, Warm, Hot, Cold recovery.

Virtualization

• Enabling Factors
• Hardware independence - Making it modular.
• Server consolidation - Sharing one server for multiple hosts.
• Resource replication - Copying resource data to multiple disks.
• Hypervisor
• Bare Metal
• Hosted

NOTE

* This is short notes of the PPT, the main topics are covered above. Each point can be elaborated more as per the question.