Build Your Own Uptime Monitor: A Complete Guide

While Outage.com monitors major services, you might want to monitor your own websites, APIs, or internal services. Here's how to build a simple uptime monitoring system from scratch.

Why Monitor Your Own Services?

Even small websites benefit from uptime monitoring:

• Catch problems before customers report them
• Track response time trends over time
• Get alerts when SSL certificates are about to expire
• Document your actual uptime for SLA purposes

Option 1: Simple Bash Script

The simplest monitor is just a script that runs on a schedule:

Basic HTTP Check

Create a file called check-sites.sh:

• Use curl to fetch your website with a timeout
• Check the HTTP status code
• Log the result and send an alert if it fails
• Run it via cron every 5 minutes

This approach is free, simple, but has limitations. It only checks from one location, has no historical data, and requires your monitoring server to be reliable.

Option 2: Using Free Monitoring Services

Several services offer free tiers for basic monitoring:

UptimeRobot

• 50 monitors free
• 5-minute check intervals
• Email alerts
• Status pages

Freshping

• 50 monitors free
• 1-minute check intervals
• Multi-location checks
• Slack integration

Healthchecks.io

• Different approach: monitors cron jobs and scheduled tasks
• Alerts if expected pings don't arrive
• Great for backup job monitoring

Option 3: Self-Hosted Solutions

For more control, self-host your monitoring:

Uptime Kuma

A beautiful, modern monitoring tool you can run yourself:

• Monitors HTTP, TCP, DNS, and more
• Beautiful dashboard with charts
• Multiple notification channels
• Status pages you can share

You can run it with Docker on any VPS.

Gatus

A developer-focused monitoring tool:

• Configuration as code (YAML)
• Supports complex conditions
• Built-in alerting
• Lightweight and fast

What to Monitor

For Websites

• Homepage availability (HTTP 200)
• Response time (should be under 3 seconds)
• SSL certificate expiration (alert 30 days before)
• Critical pages (login, checkout, API endpoints)

For APIs

• Health check endpoints
• Authentication endpoints
• Key business logic endpoints
• Response payload validation (not just status codes)

For Infrastructure

• DNS resolution time
• Database connectivity
• Redis/cache availability
• Third-party service dependencies

Alerting Best Practices

Avoid Alert Fatigue

• Don't alert on single failures (use 2-3 consecutive failures)
• Set appropriate thresholds (not every slow response is an emergency)
• Group related alerts
• Have different severity levels

Alert Channels

• **Email**: Good for low-priority notifications
• **Slack/Discord**: Good for team visibility
• **SMS/Phone**: Reserve for critical, revenue-impacting issues
• **PagerDuty/Opsgenie**: For on-call rotations

On-Call Considerations

• Define clear escalation paths
• Rotate on-call duties fairly
• Give people authority to fix problems
• Compensate for after-hours work

Advanced: Synthetic Monitoring

Basic uptime checks only verify that a server responds. Synthetic monitoring simulates actual user journeys:

• Log in to account
• Add item to cart
• Complete checkout flow

Tools like Playwright or Puppeteer can automate browser actions. Running these regularly catches problems that simple HTTP checks miss.

Recommended Setup for Small Projects

For most small to medium projects, here's a practical setup:

1. Use UptimeRobot or Freshping for basic HTTP monitoring (free tier)

2. Add Healthchecks.io for monitoring scheduled tasks and backups

3. Set up SSL monitoring with your uptime tool or a dedicated service

4. Configure alerts to go to email and one real-time channel (Slack/Discord)

5. Create a simple status page using your monitoring tool's built-in feature

This gives you comprehensive monitoring without any cost or operational overhead.

The Most Important Rule

The best monitoring setup is one you actually use and respond to. Start simple, iterate based on real incidents, and resist the urge to over-engineer.

Remember: monitoring doesn't prevent outages, but it does help you find and fix them faster. Combined with checking Outage.com for third-party service status, you'll have excellent visibility into your system's health.