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1. Introduction to well-architected framework

• developed through reviewing customers’ architectures on AWS
• build and deploy faster
• lower or mitigate risks
• make informed decision
• learn aws best practices

1.1 Five Pillars

1.1.1 Operational Excellence

• Run and monitor systems to deliver business value
• continually improve supporting processes and procedures

Disign Principles

• perform operations as code
• annotate documentation
• make frequent, small, reversible changes
• refine operations procedures frequently
• anticipate failure
• learn from all operational failures

1.1.2 Security

• protect information, systems, assets
• do risk assessments and mitigation strategies

Design Principles

• Implement a strong identity foundation
• enable traceability
• apply security best practices
• automate security best practices
• protect data in transit and at rest
• prepare for security events

1.1.3 Reliability

• recover from infrastructure or service disruptions
• dynamically acquire computing resources to meet demand
• mitigate disruptions

Design Principles:

• test recovery procedures
• automatically recover from failure
• scale horizontally to increase aggregate system availability
• stop guessing capacity
• manage change in automation

1.1.4 Performance Efficiency

• use computing resources efficiently
• maintain efficiency as demand changes and technologies evolve

Design Principles

• Democratize advanced technologies
• Go global in minutes
• use serverless architectures
• Experiment more often
• mechanical sympathy

1.1.5 Cost Optimization

• avoid or eliminate unneeded cost or suboptimal resources
  Design Principles

• adopt a consumption model

• measure overall efficiency

• stop spending money on data center operations

• analyze and attribute expenditure

• use managed services to reduce cost of ownership

2. Fault tolerance and highly available architecture

2.1 Fault tolerance

• remain operational even if components fail
• build-in redundancy of an application’s components

2.2 High Availability

• always functioning and accessible
• downtime is minimized
• without human intervention

2.3 High availability tools

2.3.1 elastic load balancers

elb - distribute income traffic to your hosts, also send metrics to cloudwatch

2.3.2 elastic IP addresses

static IP addresses designed for dynamic cloud computing, able to mask failures

applications still accessible

2.3.3 amazon route 53

Authorized DNS server,

2.3.4 auto scaling

launches and terminates by specified conditions

can be adjusted/ modified

create new resources on demand

2.3.5 amazon cloudwatch

collects and tracks infromations

2.4 Fault tolerant tools

1. Amazon simple queue service
2. Amazon simple storage service
3. Amazon simple DB
4. Amazon relational database service

3. Web hosting

3.1 benefits

• cost effective
  handle peak capacity

do on demand provisioning

• scalable
• on demand

3.2 Web hosting services

Products to assist transition:

1. Amazon Virtual Private Cloud
2. Amazon Route 53
3. Amazon CloudFront
4. Elastic load balancing
5. Firewalls/ AWS shield
6. Auto scaling
7. App servers/ EC2 instances
8. Amazon ElasticCache
9. Amazon RDS/ Amazon DynamoDB

3.3 Key Architectural considerations

1. No more physical network appliances
2. Firewalls everywhere
3. consider multiple data centers

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