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yacron2 Wiki

yacron2 is a cron replacement built on asyncio for POSIX systems. Its "crontab" is written in YAML, so jobs, schedules, and behavior are all declared in configuration: it reports job failures by email, Sentry, or shell command; retries failing jobs with exponential backoff; emits job metrics to statsd; and can expose an optional HTTP control API to inspect status and trigger jobs on demand. It runs in the foreground, logs to stdout/stderr, and supports arbitrary timezones, which suits Docker, Kubernetes, and 12-factor deployments. yacron2 is a fork of gjcarneiro/yacron (by Gustavo Carneiro), continuing development from version 0.19.

Contents

Getting Started

• Installation — Install via Docker, pip, pipx, or the self-contained binary.
• Command-Line Reference — The yacron2 command, its flags, and config file/directory loading.
• Production and Container Deployment — Running hardened under non-root, read-only-root-filesystem Kubernetes/Docker.

Configuration

• Configuration Reference — The full YAML schema: top-level sections and per-job options.
• Schedules and Timezones — Crontab strings, schedule objects, @reboot, UTC vs. local, and arbitrary timezones.
• Commands and Environment — Shell vs. argv commands, environment variables, env files, and per-job user/group.
• Output Capturing — Capturing stdout/stderr and customizing stream prefixes.
• Includes, Defaults, and Multi-File Config — Sharing settings via defaults, the include directive, and multi-file config directories.
• Logging Configuration — Customizing yacron2's own logging via the logging section.

Job Behavior

• Concurrency and Timeouts — concurrencyPolicy, executionTimeout, and killTimeout.
• Failure Detection and Retries — failsWhen rules, retry with exponential backoff, and onPermanentFailure.

Integrations

• Reporting (Mail, Sentry, Shell) — onFailure/onSuccess reporting via email, Sentry, and shell, with jinja2 templating.
• Metrics with statsd — Emitting start/stop/success/duration metrics over UDP to statsd.
• HTTP Control API — The optional REST interface for status and on-demand job starts.

Reference and Development

• Architecture and Internals — How the asyncio scheduler, jobs, and reporters fit together.
• Contributing and Releasing — Development setup, the test/lint/type-check workflow, and the release process.
• Migration from yacron — Moving from gjcarneiro/yacron to yacron2.
• Troubleshooting and FAQ — Common problems, errors, and answers.