Silent background task failures and scattered crontab files across Linux hosts make routine maintenance risky, which Cronmaster solves with a visual scheduling dashboard and live execution log viewer. Five-field cron expressions translate automatically into plain English alongside one-click schedule presets. Operators can create, comment, clone, pause, or delete scheduled jobs across single or multiple Linux users in seconds. A built-in script manager lets you write, duplicate, and organize reusable Bash scripts from starter templates right inside the browser. Turning on per-job execution logging wraps commands automatically to record standard output, standard error, start and finish timestamps, duration, and exit codes. Log retention policies keep disk usage bounded automatically. Long-running tasks stream their console output live over Server-Sent Events, and any job can be triggered on demand with a single click. Across the top of the workspace, real-time hardware telemetry cards report system uptime, CPU load, memory consumption, network throughput, and GPU utilization. Administrators can protect the interface with local password authentication, OpenID Connect single sign-on with group and role rules, or Bearer API keys for the full REST API. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. AGPL-3.0 licensed.