80 Essential Linux Monitoring Tools Every Sysadmin Should Know
This article presents a curated collection of 80 widely used Linux monitoring tools—covering command‑line utilities, desktop, infrastructure, network, and log monitoring—each with concise descriptions to help administrators choose the right solution for performance troubleshooting and system observability.
Command Line Tools
Top
This small tool is pre‑installed on many Unix systems; it provides an overview of all running processes or threads, sorting by CPU usage by default and allowing other sorting criteria.
htop
htop is an enhanced, fully interactive version of top that makes sorting processes easier, offers a more visual interface, and includes built‑in commands for common tasks.
mytop
mytop is a compact utility for monitoring MySQL threads and performance, giving a live view of the database and the queries being processed in real time.
iftop
iftop works like top but monitors network traffic on selected interfaces, displaying a table of current usage to help answer why a network connection may be slow.
darkstat
darkstat captures network traffic, calculates usage statistics, and serves graphical reports via a simple HTTP server.
strace
strace diagnoses, debugs, and monitors interactions between processes by printing the list of system calls made by a program, useful when behavior is unexpected.
DTrace
DTrace extends strace by dynamically inserting instrumentation code into live instructions, enabling deep performance analysis and troubleshooting.
Desktop Monitoring
ntopng
ntopng is the next‑generation version of ntop, providing a browser‑based graphical UI for network monitoring, including host geolocation, traffic distribution, and analysis.
Infrastructure Monitoring
OpenNMS
OpenNMS offers four main functional areas—event management and notifications, discovery and provisioning, service monitoring, and data collection—and is highly customizable for various network environments.
SysUsage
SysUsage continuously monitors the system via sar and other commands, provides threshold‑based alerts, stores collected statistics centrally, and includes a web interface for viewing them.
Network Monitoring
Nagios
Nagios is a system and network monitoring tool that tracks many servers, provides alerting when issues arise, and supports numerous plugins for extended functionality.
Log Monitoring Tools
GoAccess
GoAccess is a real‑time web log analyzer for Apache, Nginx, or Amazon CloudFront logs, capable of outputting results in HTML, JSON, or CSV and providing statistics, top visitors, 404s, geolocation, and more.
Swatch
Swatch monitors logs like Logwatch but watches for regular‑expression matches and notifies via mail or console, useful for intrusion detection.
MultiTail
MultiTail lets you monitor multiple log files in separate windows, merge them, and use colors with regular‑expression support for easier reading.
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