How to ensure fault tolerance in the cloud?

Cloud resilience is achieved through several key approaches:

• Resource redundancy: Using multiple instances of services (replicas) and load balancers to distribute traffic.
• Geographical distribution: Placing resources in different availability zones and regions to protect against local failures.
• Automatic recovery: Setting up auto-scaling and mechanisms for restarting failed instances.
• Backup and recovery: Regularly creating data backups and testing recovery procedures.
• Monitoring and alerting: Constantly monitoring service status and responding promptly to incidents.
• Using managed services: Cloud providers offer services with built-in resilience (e.g., databases with replication).

Example: In AWS, for resilience, an Auto Scaling Group with multiple instances in different AZs, Elastic Load Balancer for traffic distribution, and RDS with Multi-AZ deployment for the database are used.