AWS Compute Options for High Availability

AMI Management

Best Practices

• Maintain up-to-date AMIs

• Regular updates and patching

• Version control and documentation

• Test AMIs before deployment

Cross-Region Strategy

• Copy AMIs to multiple regions

• Support DR staging requirements

• Enable geographic redundancy

• Facilitate failover capabilities

Architecture Considerations

Horizontal Scaling

• Preferred over vertical scaling

• Distributes risk across multiple instances

• Improves fault tolerance

• Enhanced availability

Resource Availability

• Reserved Instances guarantee capacity

• Capacity planning for DR scenarios

• Cost-effective long-term commitment

• Ensures resource availability during failover

High Availability Components

Auto Scaling Groups

• Automatic instance management

• Self-healing capabilities

• Dynamic scaling based on demand

• Maintains desired capacity

Elastic Load Balancers

• Traffic distribution

• Health monitoring

• Automatic instance removal/addition

• Cross-zone load balancing

Integration Benefits

• ASG and ELB work together

• Automated instance replacement

• Load distribution optimization

• Enhanced resilience

Route 53 Failover

Health Checks

• HTTP endpoint monitoring

• Automatic failover capability

• No manual intervention required

• Regular status verification

Implementation Example

1. Primary Setup

   • On-premises web farm

   • HTTP endpoint monitoring

   • Regular health checks

   • Traffic routing configuration

2. Failover Configuration

   • AWS backup web farm

   • Automatic traffic redirection

   • Zero manual intervention

   • Seamless transition

Best Practices

AMI Management

• Regular updates

• Version control

• Testing procedures

• Documentation maintenance

Infrastructure Design

• Implement horizontal scaling

• Use Reserved Instances for critical workloads

• Configure auto scaling groups

• Deploy load balancers

Monitoring and Failover

• Configure Route 53 health checks

• Set up automatic failover

• Monitor system health

• Test failover procedures

Cost Optimization

• Balance Reserved Instance purchases

• Optimize auto scaling thresholds

• Monitor resource utilization

• Review capacity requirements

Implementation Recommendations

Initial Setup

1. Establish AMI maintenance procedures

2. Deploy across multiple availability zones

3. Configure auto scaling groups

4. Set up load balancers

5. Implement health checks

Ongoing Management

1. Regular AMI updates

2. Capacity monitoring

3. Performance optimization

4. Failover testing

5. Documentation updates

Disaster Recovery Considerations

Preparation

• Maintain current AMIs

• Reserved Instance capacity

• Cross-region capabilities

• Documented procedures

Automation

• Auto scaling configuration

• Health check setup

• Failover routing

• Self-healing systems