kula

Kula is a lightweight, self-contained Linux server monitoring tool written in Go. It collects system metrics every second by reading directly from /proc and /sys, stores them in a built-in tiered ring-buffer storage engine, and serves them through both a real-time web dashboard and a terminal TUI — with zero external dependencies and no database required.

The storage engine uses pre-allocated ring-buffer files organized into three tiers: 1-second raw samples (Tier 1), 1-minute aggregates (Tier 2), and 5-minute aggregates (Tier 3). This gives predictable, bounded disk usage with no cleanup needed.

• CPU Monitoring - Per-core and total usage across user, system, idle, iowait, irq, steal, and guest states
• Memory & Swap - Total, free, available, used, buffers, cached, shmem, dirty, and mapped metrics
• Network - Per-interface throughput in Mbps, packets per second, errors, drops, and TCP/UDP/ICMP counters
• Disk I/O - Per-device read/write bytes per second, utilization percentage, and filesystem and inode usage
• System Info - Uptime, entropy, clock sync status, hostname, and logged-in users
• Process Tracking - Task counts by state (running, sleeping, blocked, zombie) and total thread counts
• Web Dashboard - Embedded single-page application with interactive Chart.js graphs, drag-select zoom, focus mode, and gap detection
• Terminal TUI - Built with bubbletea and lipgloss for an in-terminal monitoring interface
• WebSocket Streaming - Live metric delivery via WebSocket with REST API fallback for historical ranges
• Optional Authentication - Argon2id password hashing with session cookies or Bearer token support
• Multiple Install Paths - Available as a standalone binary, Debian/Ubuntu .deb package, Docker container, AUR package, or built from source
• Init System Support - Service files provided for systemd, OpenRC, and runit

To get started, download the binary from the GitHub releases page, copy config.example.yaml to config.yaml, and run ./kula serve to start the dashboard on http://localhost:8080. Alternatively, run ./kula tui for the terminal interface.