SPOF (Single Point of Failure) - VittorioDeMarzi/hero-beans GitHub Wiki

~: if any component in my system/infrastructure goes down, the whole service crashes.

To avoid it, use redundancy and failover.

Redundancy: Having multiple copies of a critical component so that if one fails, another can take over
Failover: The automatic switching to a redundant component when the primary one fails

"Avoid adopting technologies just to solve problems that haven’t happened yet." – This documentation is not the ultimate guide to follow. Test, leverage, decide - don't follow blindly.

• Run multiple replicas (Docker containers / Kubernetes pods).
• Put them behind Nginx.
• If one instance OOMs or restarts, others handle traffic.

• X Don't run MySQL in a single Docker container
• Use RDS MySQL Multi-AZ (or Aurora).
  • Automated failover if the primary goes down.
  • Backups & monitoring built-in.
• Add connection pool failover in Spring Boot (HikariCP can handle multiple hosts).

• X Don’t run a single Nginx in EC2 — SPOF.
• Use AWS ALB (Application Load Balancer) instead of managing Nginx yourself.
  • Handles TLS termination.
  • Distributes requests across multiple app instances.
  • Scales automatically.

• If you run all in one VM, the VM itself is SPOF.
• Cloud-managed, AWS.
• X One EC2 = SPOF.
• Use multiple AZs:
  • ALB → routes across multiple AZs automatically.
  • ECS/EKS → deploy tasks/pods in at least 2 AZs.
  • RDS Multi-AZ → standby in another AZ.