Docker

Monitor containerized cron jobs by adding curl to your container and pinging from the entrypoint or crontab:

Dockerfile

FROM python:3.12-slim
RUN apt-get update && apt-get install -y curl cron
COPY crontab /etc/cron.d/app-cron
RUN chmod 0644 /etc/cron.d/app-cron && crontab /etc/cron.d/app-cron
CMD ["cron", "-f"]

crontab

*/5 * * * * /app/run-task.sh && curl -fsS https://watchcron.com/ping/your-uuid > /dev/null 2>&1

docker-compose.yml

services:
  worker:
    build: .
    environment:
      - WATCHCRON_PING_URL=https://watchcron.com/ping/your-uuid
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:8080/health"]
      interval: 30s
      timeout: 10s

Pass the ping URL as an environment variable so you can change it without rebuilding the image. Reference it in your scripts with $WATCHCRON_PING_URL.

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