krautsalad/cron repository overview

⁠docker-cron

Cron in a Docker Container.

docker-cron is an Alpine-based Docker container running Cron⁠. It allows you to define a custom crontab that is executed by the Cron daemon.

⁠Configuration

⁠Docker Compose Example

# docker-compose.yml
services:
  cron:
    container_name: cron
    environment:
      CRONTAB: |
        0 0 * * * echo "Already Midnight again!" >> /var/log/cron/cron.log 2>&1
        0 8 * * * echo "Good Morning!" >> /var/log/cron/cron.log 2>&1
      TZ: Europe/Berlin
    image: krautsalad/cron
    restart: unless-stopped

⁠Environment Variables

• CRONTAB: A complete crontab definition (default: empty).
• TZ: Timezone setting (default: UTC).

⁠How it works

The container runs Cron as a daemon, executing the cron jobs defined in your CRONTAB environment variable. To ensure that the output of your cron jobs is visible in the container logs, append >> /var/log/cron/cron.log 2>&1 to your job commands. This log file is symlinked to the container's standard output.

⁠Source Code

You can find the full source code on GitHub⁠.