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
Primary Setup
On-premises web farm
HTTP endpoint monitoring
Regular health checks
Traffic routing configuration
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
Establish AMI maintenance procedures
Deploy across multiple availability zones
Configure auto scaling groups
Set up load balancers
Implement health checks
Ongoing Management
Regular AMI updates
Capacity monitoring
Performance optimization
Failover testing
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
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