How to design high availability in the cloud

· Category: Cloud Computing

Short answer

High availability eliminates single points of failure by distributing workloads across multiple zones and regions.

Steps

  1. Deploy across multiple availability zones.
  2. Use load balancers with health checks.
  3. Replicate databases with automatic failover.
  4. Implement auto-scaling groups for compute.
  5. Design stateless application tiers.

Tips

  • Use managed services that offer built-in HA (RDS Multi-AZ, Cosmos DB).
  • Test failover procedures regularly with chaos engineering.
  • DNS failover routes traffic away from unhealthy regions.

Common issues

  • Synchronous cross-region calls increase latency and fragility.
  • Database failover may still involve brief downtime; plan accordingly.