🛠️ CronOps – Jenkins Cron Job Manager with CI/CD, K8s & Monitoring ♾️☸️📊

CronOps is a web application that simplifies the creation and management of Cron Jobs for Jenkins. Instead of writing raw cron expressions, users can input human-readable scheduling parameters like minute, hour, day, week and month. The backend generates the cron expression, provides a human-readable explanation, and shows upcoming execution times. It’s containerized, production-ready, CI/CD enabled, and observability-focused with Prometheus, Grafana, and Loki.

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📑 Table of Contents

• Features
• Tech Stack
• Project Structure
• Architecture
• Screenshots
• CI/CD Pipeline
• Local Setup (Docker)
• Kubernetes Setup
• Monitoring
• Secrets Management
• Demo
• Author

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✨ Features

• 🧠 Human-friendly Jenkins cron job builder
• 📝 Generates cron expression, description & execution preview
• 🗄️ Saves jobs with title, description, and schedule
• 📦 Containerized with Docker + Volumes
• ☸️ Kubernetes manifests for production deployment + persistent volumes
• 🔁 GitHub Actions CI/CD pipeline (test → build → push → scan)
• 📊 Real-time monitoring with Prometheus, Grafana, and Loki
• 🔒 Secrets managed via .env (local) and Kubernetes Secrets (prod)

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🧰 Tech Stack

Layer	Tool / Technology
Frontend	HTML, CSS, JavaScript
Backend	Go
Database	PostgreSQL
Container	Docker, Docker Compose
Deployment	Kubernetes (Minikube)
CI/CD	GitHub Actions, Trivy
Monitoring	Prometheus, Grafana, Loki
Security	Kubernetes Secrets, .env
Volumes	Docker & K8s PV/PVC

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🗂️ Project Structure

CronOps/
├── cronops-data/                     # Data storage folder
├── docs/                             # Architecture diagram & screenshots
│   ├── architecture.png
│   ├── grafana-dashboard.png
│   ├── screenshot1.png
│   ├── screenshot2.png
│   └── screenshot3.png
├── Kubernetes/                       # Kubernetes manifests
│   ├── cronops-deployment.yaml
│   ├── cronops-service.yaml
│   ├── postgres-deployment.yaml
│   ├── postgres-pv.yaml
│   ├── postgres-pvc.yaml
│   ├── postgres-secret.yaml          # Ignored from Git, for K8s secrets
│   └── postgres-service.yaml
├── static/                           # Frontend (HTML, CSS, JS)
├── .env                              # Environment variables (local use only)
├── .github/                          # GitHub Actions workflows
│   └── workflows/
│       └── deploy.yaml
├── .gitignore                        # Git ignored files
├── cronops.log                       # Application log file (unstaged)
├── docker-compose.yaml               # Docker Compose for local dev
├── Dockerfile                        # Dockerfile for Go backend
├── go.mod                            # Go module dependencies
├── Grafana-dashboard.png             # Dashboard screenshot (updated image exists in docs/)
├── init_db.sql                       # SQL schema init script
├── main.go                           # Entry point of backend
├── main_test.go                      # Unit tests
├── migrations.go                     # Go logic for schema creation

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🏗️ Architecture

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📸 Screenshots

Cron expression to run daily every hour Saving cron expression to database Saved cron expression

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⚙️ CI/CD Pipeline

• GitHub Actions pipeline:
  • ✅ Run Go unit tests
  • 🐳 Build Docker image for backend
  • 🚢 Push to DockerHub: nsahil992/cronops
  • 🛡️ Scan for vulnerabilities with Trivy

# .github/workflows/deploy.yaml
- name: Run the Go tests
- name: Build & Push Docker Image
- name: Trivy Docker image Scanning

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.env.example

DB_HOST=localhost/host.docker.internal/database
DB_PORT=5432 (your db port)
DB_USER=(your db user)
DB_PASSWORD=(your postgres password)
DB_NAME=(your database name)

postgres-secret.example.yaml

apiVersion: v1
kind: Secret
metadata:
  name: postgres-secret
type: Opaque
data:
  POSTGRES_USER: anscGdssSE 
  POSTGRES_PASSWORD: c2hsgadafkgsdg== 
  POSTGRES_DB: Y3JvbfasbngnRlcg== 

  # echo -n "your value" | base64

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💻 Local Setup (Docker)

# Clone the repo
git clone https://github.com/nsahil992/CronOps
cd CronOps

# Copy and configure .env
cp .env.example .env

# Start containers
docker compose up --build

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☸️ Kubernetes Setup

# Apply Postgres manifests first
kubectl apply -f postgres-pvc.yaml -f postgres-secret.yaml -f postgres-service.yaml -f postgres-deployment.yaml -f postgres-pv.yaml -n cronops

# Apply CronOps manifests
kubectl apply -f cronops-deployment.yaml -f cronops-service.yaml -n cronops

📊 Monitoring

Monitoring stack includes:

Prometheus – scrapes /metrics from the Go app Grafana – visual dashboards for metrics Loki – central log collection via promtail

# Access:
# Prometheus: http://localhost:9090
# Grafana: http://localhost:3000 (default: admin/admin)
# Loki: http://localhost:3100

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🔐 Secrets Management

✅ .env is used for local development only and is never committed to GitHub ✅ Kubernetes Secrets are defined in postgres-secret.yaml (base64-encoded) 🔒 You must create secrets locally

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📽️ Demo

🔗 Click the image above to watch a 5-minute walkthrough of CronOps in action.

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👤 Author

Sahil – DevOps & SRE enthusiast building useful systems

• GitHub
• LinkedIn

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