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#Availability Patterns

Patterns for high availability systems.

#Key Patterns

#Health Endpoint Monitoring

yaml
1# Kubernetes probe
2livenessProbe:
3  httpGet:
4    path: /health
5    port: 8080
6  initialDelaySeconds: 5

#Circuit Breaker

diagram
[Client] ──▶ [Circuit Breaker] ──▶ [Service]
                    │
                    └── Opens on failures
                        Prevents cascade

#Retry with Backoff

python
1import time
2
3def retry_with_backoff(func, max_retries=3):
4    for attempt in range(max_retries):
5        try:
6            return func()
7        except Exception:
8            time.sleep(2 ** attempt)
9    raise Exception("Max retries exceeded")

#Multi-Region

  • Active-Active: Both regions serve traffic
  • Active-Passive: Standby for failover
  • Pilot Light: Minimal standby, scale on failover

[!TIP] Pro Tip: Design for failure - everything fails eventually!