When Disk Space Disappears: Tracking Down and Preventing Logs from Filling Up Your Linux Disks

Sat, 30 May 2026 10:13:51 +0200

Introduction to Disk Space Issues

I’ve seen this go wrong when managing Linux systems - the sudden disappearance of disk space. It’s often caused by log files filling up the disk, large files being stored in unexpected locations, or even malware consuming disk space. In this article, I’ll focus on tracking down and preventing logs from filling up your Linux disks.

Understanding Log Files

Log files are essential for Linux system administration, providing valuable information about system events, errors, and security issues. However, if not properly managed, log files can grow rapidly and consume large amounts of disk space. The most common log files that can cause issues are:

Using jq to Parse and Manipulate JSON Logs from systemd-journald

Tue, 19 May 2026 08:58:34 +0200

Introduction to jq and systemd-journald

I’ve found that working with Linux systems often involves digging through logs to troubleshoot issues. systemd-journald is a key component in this process, collecting and storing log messages from various sources. Since these logs are often in JSON format, tools like jq become incredibly useful for parsing and manipulation. In this article, I’ll walk you through how to use jq to parse and manipulate JSON logs from systemd-journald.

Logging on Linux Security

When Disk Space Disappears: Tracking Down and Preventing Logs from Filling Up Your Linux Disks

Introduction to Disk Space Issues

Understanding Log Files

Using jq to Parse and Manipulate JSON Logs from systemd-journald

Introduction to jq and systemd-journald