Design Highly Available and Fault-Tolerant Architectures
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Designing architectures that can withstand failures and continue to operate is essential for mission-critical applications. High availability and fault tolerance are key strategies in achieving this resilience. While they share similarities, it's important to understand their differences and how to implement them effectively using AWS services.
In this lesson, we will cover:
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High Availability
High availability refers to systems designed to remain operational and accessible for the maximum possible time. It minimizes downtime by quickly recovering from failures, ensuring that services are available when users need them.
Key Characteristics:
Example Scenario:
An application runs on two servers in an active-passive configuration. If the primary server fails, the standby server takes over after a brief failover process. Users may experience a short interruption but can resume work quickly.
Fault Tolerance
Fault tolerance is the ability of a system to continue operating without interruption when one or more of its components fail. Fault-tolerant systems are designed to handle failures seamlessly without affecting overall functionality.
Example Scenario:
An application runs on two servers in an active-active configuration. If one server fails, the other continues serving users without any downtime or noticeable impact.
Disaster Recovery
Disaster recovery involves planning and implementing strategies to recover systems and data after catastrophic events such as natural disasters, system failures, or human errors.
Key Components:
Strategies:
Designing for High Availability and Fault Tolerance
When designing architectures for high availability and fault tolerance, consider the following steps:
Identify Single Points of Failure:
Implement Redundancy and Replication:
Choose Appropriate AWS Services:
Evaluate Disaster Recovery Objectives:
AWS Services and Strategies
AWS Global Infrastructure
Compute Services
Storage Services
Database Services
Networking Services
Disaster Recovery Services
Monitoring and Automation
Designing for Legacy Applications
Best Practices
Conclusion
Designing highly available and fault-tolerant architectures is essential for building resilient applications on AWS. High availability, fault tolerance, disaster recovery, and leveraging AWS services effectively allow you to create systems that withstand failures and maintain continuous operations.
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