Komari — Simple Self-Hosted Server Monitoring Tool

Introduction

Komari is a lightweight, self-hosted server monitoring tool that provides real-time visibility into your infrastructure with minimal resource overhead. Its clean web dashboard shows CPU, memory, disk, and network metrics across all your servers without complex configuration.

What Komari Does

• Monitors CPU, memory, disk, and network on Linux and macOS hosts
• Displays real-time metrics on a responsive web dashboard
• Sends alerts via webhook, Telegram, or email on threshold breaches
• Tracks historical data for trend analysis
• Provides remote terminal access for quick troubleshooting

Architecture Overview

Komari uses a lightweight Go agent on monitored hosts that reports metrics to a central server via WebSocket. The server stores time-series data in an embedded database and serves the web dashboard as a single-page application. The agent binary is under 10MB and uses minimal CPU and memory.

Self-Hosting & Configuration

• Deploy server via Docker or single binary on any Linux host
• Agent installs with a one-line script on monitored machines
• Configure alert thresholds in the web UI or config file
• Supports reverse proxy with Nginx or Caddy for HTTPS
• Data retention configurable from days to months

Key Features

• Sub-10MB agent with negligible resource consumption
• One-command agent installation with auto-registration
• Mobile-responsive dashboard for on-the-go monitoring
• Multi-server overview with sorting and grouping
• No external database dependency (embedded storage)

Comparison with Similar Tools

• Beszel — similar lightweight approach; Komari adds remote terminal access
• Netdata — feature-rich but heavier; Komari focuses on simplicity
• Uptime Kuma — primarily uptime checks; Komari provides full system metrics
• Grafana + Prometheus — powerful but complex setup; Komari works out of the box

FAQ

Q: What operating systems does the agent support? A: Linux (x86_64, ARM64) and macOS. Windows support is experimental.

Q: How much disk space does historical data use? A: Approximately 1MB per host per day at default collection intervals.

Q: Can I monitor Docker containers? A: Yes, container-level metrics are collected when Docker is detected.

Q: Is there an API for custom integrations? A: Yes, a REST API provides all metrics and alert management programmatically.

Sources

• https://github.com/komari-monitor/komari