Monitor Docker Cron Containers

Learn how to monitor scheduled tasks running in Docker containers and Kubernetes CronJobs.

Features

Works with Docker Compose and Kubernetes
Health check endpoint integration
Sidecar container pattern
Init container monitoring

Code Examples

Dockerfile

FROM alpine:latest

RUN apk add --no-cache curl bash

COPY backup.sh /app/backup.sh
RUN chmod +x /app/backup.sh

# Wrapper script with monitoring
COPY <<'EOF' /app/run.sh
#!/bin/bash
CHECK_URL="https://haspulse.io/ping/$CHECK_ID"
curl -fsS "$CHECK_URL/start"
/app/backup.sh
if [ $? -eq 0 ]; then
    curl -fsS "$CHECK_URL"
else
    curl -fsS "$CHECK_URL/fail"
fi
EOF
RUN chmod +x /app/run.sh

CMD ["/app/run.sh"]

docker-compose.yml

version: '3.8'
services:
  backup:
    build: .
    environment:
      - CHECK_ID=YOUR_CHECK_ID
    # Run daily at 3 AM using ofelia or supercronic
    labels:
      ofelia.enabled: "true"
      ofelia.job-exec.backup.schedule: "0 3 * * *"
      ofelia.job-exec.backup.command: "/app/run.sh"

Kubernetes CronJob

apiVersion: batch/v1
kind: CronJob
metadata:
  name: database-backup
spec:
  schedule: "0 3 * * *"
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: backup
            image: your-backup-image
            env:
            - name: CHECK_ID
              valueFrom:
                secretKeyRef:
                  name: haspulse
                  key: check-id
            command:
            - /bin/sh
            - -c
            - |
              curl -fsS "https://haspulse.io/ping/$CHECK_ID/start"
              /app/backup.sh && \
                curl -fsS "https://haspulse.io/ping/$CHECK_ID" || \
                curl -fsS "https://haspulse.io/ping/$CHECK_ID/fail"
          restartPolicy: OnFailure

How It Works

1
Create a check in Haspulse
Set your expected schedule (e.g., every 5 minutes)
2
Add the ping to your code
Ping the unique URL when your job runs successfully
3
Get alerted on failures
If a ping doesn't arrive on time, we notify you

Related Integrations

Monitor Bash Cron Scripts

Monitor Node.js Cron Jobs

Monitor Go Cron Jobs

Start monitoring in minutes

Create your first check and start receiving alerts when your scheduled jobs fail.

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