A full disk is one of the most common causes of VPS crashes. When disk space runs out, databases can’t write, log files can’t rotate, and applications fail in unpredictable ways. MySQL crashes, PHP sessions fail, and even SSH may stop working if /var/log fills up. The worst part: by the time you notice, the damage is often done. Proactive monitoring is essential for any production VPS.
Why Disk Space Kills Servers
A full disk is one of the most common causes of VPS crashes. When disk space runs out, databases can’t write, log files can’t rotate, and applications fail in unpredictable ways. MySQL crashes, PHP sessions fail, and even SSH may stop working if /var/log fills up. The worst part: by the time you notice, the damage is often done. Proactive monitoring is essential for any production VPS.
Monitoring and Alerting Setup
Check disk usage with df -h. Set up automated alerts at 80% and 90% thresholds using a monitoring tool (Uptime Kuma, Nagios, or a simple cron script that emails you). The cron approach: USAGE=$(df / | tail -1 | awk '{print $5}' | tr -d '%'); if [ $USAGE -gt 85 ]; then echo 'Disk at ${USAGE}%' | mail -s 'Disk Alert' [email protected]; fi. Schedule this every hour. Also monitor inode usage with df -i — you can run out of inodes before disk space.
Automatic Cleanup Strategies
Configure logrotate to compress and delete old logs automatically. Purge apt cache: apt clean. Remove old kernels: apt autoremove. Clean Docker: docker system prune -a. Set up database binary log expiration: expire_logs_days = 7. Monitor largest directories with du -sh /* | sort -rh | head. On VeloxMedia’s great infrastructure, generous storage allocations give you breathing room, but monitoring remains essential.
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