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System design patterns

Sharding, load balancing, CAP tradeoffs, and scaling patterns — interview and production ready.

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System design patterns easy

How to Build a Health Check System with Instance Up and Down Status in Python

Track instance health by marking them up or down and simulating health checks with a mock class in Python.

health-check monitoring system-design
Python 
from datetime import datetime
import random

class HealthChecker:
    def __init__(self):
        self.status = {}
    
    def mark_up(self, instance_id):
        self.status[instance_id] = {
            "state": "up",
            "last_check": datetime.now().isoformat(),
            "healthy": True
        }
    
  …
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