How do I set up Cronmaster with Docker Compose?

Create a docker-compose.yml file with the minimal configuration from the README, set environment variables like AUTH_PASSWORD, and run 'docker compose up'. Detailed options are documented in DOCKER.md.

Cronmaster vs traditional crontab: which is better?

Cronmaster is better for teams needing a web UI with real-time logging and system monitoring. Traditional crontab is sufficient for simple, CLI-based management without the overhead of self-hosting.

Can Cronmaster manage cron jobs on multiple servers?

No, it's designed for single-host management by directly accessing the local crontab. For multiple servers, you'd need to deploy separate instances or use the API for basic integration, but it lacks centralized multi-host features.

How to enable SSO authentication in Cronmaster?

Configure OIDC environment variables such as OIDC_ISSUER and OIDC_CLIENT_ID as per the SSO.md documentation. You can enable both password and SSO for flexible login options.

Does Cronmaster support logging for all cron jobs?

Logging is optional per job; you can enable it when creating or editing a cron job. It captures stdout, stderr, exit codes, and timestamps, with automatic cleanup settings detailed in LOGS.md.

Is Cronmaster secure for production use?

It includes authentication and SSO support, but the Docker setup requires root access, which is a security concern. Ensure proper network isolation and use strong credentials or SSO to mitigate risks.

Open-Awesome

Cronmaster

AGPL-3.0TypeScript2.4.0Self-Hosted

A modern web UI for managing cron jobs with live logging, script management, and system monitoring.

GitHub

1.4k stars38 forks0 contributors

What is Cronmaster?

Cronmaster is a self-hosted web application that provides a modern graphical interface for managing system cron jobs. It solves the problem of cumbersome command-line cron management by offering a responsive UI with live logging, script editing, and system monitoring. The tool integrates directly with the host's crontab and runs in a Docker container for easy deployment.

Target Audience

System administrators, DevOps engineers, and developers who manage scheduled tasks on Linux servers and want a visual, real-time alternative to editing crontab files manually.

Value Proposition

Developers choose Cronmaster for its real-time job logging, intuitive UI, and self-hosted nature—offering greater control and visibility than traditional cron tools without relying on external SaaS services.

Overview

Cronjob management UI with human readable syntax, live logging and log history for your cronjobs.

Use Cases

Best For

Managing cron jobs across multiple servers from a single web dashboard
Debugging scheduled tasks with live log streaming and execution history
Self-hosting a cron management solution with OIDC/SSO authentication
Monitoring system resources (CPU, memory, uptime) alongside job schedules
Creating and organizing reusable bash scripts for cron jobs
Integrating cron management into existing workflows via REST API

Not Ideal For

Environments with strict security policies that prohibit running Docker containers as root, as Cronmaster requires root access for cron operations.
Projects using Kubernetes or distributed systems, as it's designed for single-host cron management without native clustering support.
Teams seeking a lightweight, CLI-only tool without the overhead of a web server and real-time features.
Organizations preferring fully managed cloud cron services (e.g., AWS EventBridge) without self-hosting responsibilities.

Pros & Cons

Pros

Real-Time Monitoring

Uses Server-Sent Events for live job status updates and log streaming, providing immediate visibility into execution without page refreshes.

Integrated Script Editor

Includes a built-in UI for creating and managing bash scripts with code snippets, streamlining script development for cron jobs directly from the dashboard.

Flexible Authentication

Supports both password-based and OIDC SSO authentication, allowing integration with providers like Google or Keycloak for secure access control.

Docker-First Deployment

Offers easy setup with Docker Compose, including multi-architecture support (AMD64/ARM64) and comprehensive documentation for containerized environments.

Cons

Root Privilege Requirement

In Docker mode, it must run as root to access host crontab files, which the README explicitly admits is unavoidable and poses security risks.

Configuration Complexity

Requires managing numerous environment variables and separate documentation files (e.g., DOCKER.md, ENV_VARIABLES.md), leading to a steep initial setup.

Limited Ecosystem

As a self-hosted tool, it lacks the integrations, plugins, or community support of established cron management platforms, potentially limiting scalability.

Frequently Asked Questions

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