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Cloud Fundamental Concepts
Cloud computing models, benefits and design principles
⏱️ Estimated reading time: 15 minutes
What is Cloud Computing?
Cloud Computing is the on-demand delivery of IT resources over the Internet with pay-as-you-go pricing. Instead of buying, owning, and maintaining physical data centers and servers, you can access technology services as you need them.
Key characteristics:
- On-demand self-service: Provision resources without human intervention
- Broad network access: Available over the Internet
- Resource pooling: Resources shared among multiple customers
- Rapid elasticity: Scales automatically based on demand
- Measured service: Pay only for what you use
Key characteristics:
- On-demand self-service: Provision resources without human intervention
- Broad network access: Available over the Internet
- Resource pooling: Resources shared among multiple customers
- Rapid elasticity: Scales automatically based on demand
- Measured service: Pay only for what you use
🎯 Key Points
- ✓ IT services delivery over the Internet
- ✓ Pay-as-you-go model
- ✓ Automatic scalability and elasticity
- ✓ No physical infrastructure required
Deployment and Service Models
Deployment Models:
- Public Cloud: Shared resources, owned by cloud providers
- Private Cloud: Infrastructure dedicated to one organization
- Hybrid Cloud: Combination of public and private
Service Models:
- IaaS (Infrastructure): EC2, VPC - Control over infrastructure
- PaaS (Platform): Elastic Beanstalk - Application management
- SaaS (Software): Gmail, Office 365 - Ready-to-use applications
- Public Cloud: Shared resources, owned by cloud providers
- Private Cloud: Infrastructure dedicated to one organization
- Hybrid Cloud: Combination of public and private
Service Models:
- IaaS (Infrastructure): EC2, VPC - Control over infrastructure
- PaaS (Platform): Elastic Beanstalk - Application management
- SaaS (Software): Gmail, Office 365 - Ready-to-use applications
🎯 Key Points
- ✓ Three deployment models: public, private, hybrid
- ✓ IaaS, PaaS, and SaaS by management level
- ✓ AWS primarily offers IaaS and PaaS
- ✓ Choose based on control requirements
Cloud Benefits
Main advantages:
1. Trade capital expense for variable expense
- Don't invest in infrastructure before using it
- Pay only for consumed resources
2. Massive economies of scale
- Lower prices from aggregated usage of thousands of customers
3. Stop guessing capacity
- Scale up or down based on need
- Avoid underutilized resources or lack of capacity
4. Increase speed and agility
- Provision resources in minutes
- Experiment and innovate quickly
5. Stop spending on data centers
- Focus on projects that differentiate the business
6. Go global in minutes
- Deploy applications in multiple regions globally
1. Trade capital expense for variable expense
- Don't invest in infrastructure before using it
- Pay only for consumed resources
2. Massive economies of scale
- Lower prices from aggregated usage of thousands of customers
3. Stop guessing capacity
- Scale up or down based on need
- Avoid underutilized resources or lack of capacity
4. Increase speed and agility
- Provision resources in minutes
- Experiment and innovate quickly
5. Stop spending on data centers
- Focus on projects that differentiate the business
6. Go global in minutes
- Deploy applications in multiple regions globally
🎯 Key Points
- ✓ Flexible and predictable cost model
- ✓ Scalability without upfront investment
- ✓ Instant global reach
- ✓ Greater agility and innovation