Website Uptime Monitor with Email Alerts

Project roadmap

1. 01

   Define the URL watchlist and config file

   ~1h

   Create a config file listing URLs, expected status codes, and latency thresholds to monitor.

2. 02

   Write the check function using curl

   ~2h

   Use curl -w to capture HTTP status and response time for each URL without downloading the full body.

3. 03

   Persist results to a history log

   ~1.5h

   Append each check's timestamp, status, and latency to a CSV log file for later analysis.

4. 04

   Implement stateful alerting

   ~2.5h

   Track last-known state per URL so alerts only fire on state transitions (up to down), preventing repeated emails.

5. 05

   Wire up email notifications

   ~1.5h

   Send a formatted alert email via mailx when a down or slow state is detected, including recent history.

6. 06

   Schedule via cron and add log rotation

   ~1h

   Add a crontab entry to run checks every 5 minutes and rotate the history log weekly.

Resources

• DocsBash Reference Manual