ETL Project Implementation Guide - Phase by Phase

This project implements a robust, production-grade ETL pipeline on a Docker Swarm cluster, following modern DevOps and security best practices. The architecture includes PostgreSQL HA, Keycloak authentication, Apache Spark for data processing, and a full observability stack (Prometheus, Grafana, Loki, OpenTelemetry).

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Phase 1: Project Introduction & Setup

1. Understand ETL Fundamentals
   • Review docs/1. Introduction.md for ETL concepts and hands-on exercises using Knime and COVID data.
2. Provision Infrastructure
   • Deploy Swarm managers (public IP, SSH bastion) and workers (private IP). See tasks/Project.md for node inventory and architecture diagrams.
   • Harden OS using Ansible and Lynis (src/ansible/README.md).
3. DevOps Planning
   • Establish branching strategy (dev, test, main).
   • Prepare CI/CD pipeline templates (tasks/Tasks.md).
   • Set up monitoring (src/services/monitoring/README.md).

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Phase 2: Authentication

1. Keycloak Deployment
   • Deploy Keycloak as a Docker service with HTTPS/SSL (src/services/keycloak/README.md).
   • Configure realms, clients, and roles (System Administrator, Data Manager, Analyst).
   • Integrate Keycloak with PostgreSQL for user data (docs/keycloak/test/README.md).
   • Connect frontend/backend to Keycloak on the same Docker network.
2. CI/CD & Environments
   • Implement CI/CD for automatic builds, tests, and Docker image publication (tasks/Tasks.md).
   • Provide isolated dev, test, and prod environments.
   • Prepare Kubernetes manifests for future cloud-native deployments.

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Phase 3: Data Loading

1. Database Infrastructure
   • Deploy PostgreSQL HA cluster (master/replica) with HAProxy (src/services/database/).
   • Configure access control for team independence.
   • Automate backups and test restoration (tasks/Project.md).
2. Security & Validation
   • Enforce DoS protection, file size/upload limits, and data validation (docs/3. Data Loading.md).
   • Monitor for unusual activity (Prometheus, Alertmanager).
3. DevOps Support
   • Assist teams with DB operations, backup automation (pg_dump, cron), and monitoring setup (src/services/monitoring/README.md).

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Phase 4: Data Operations

1. Spark Deployment
   • Deploy Apache Spark cluster for distributed data processing (src/services/spark/README.md).
   • Integrate with backend for dynamic SparkSQL generation.
   • Store Spark job history/logs on shared storage (docs/volumes.md).
2. Observability
   • Deploy OpenTelemetry Collector, Prometheus, Grafana, Loki, and Alertmanager (src/services/monitoring/README.md).
   • Expose /metrics endpoints for all services.
   • Set up dashboards and alerts for Spark, DB, and Keycloak.
3. Pipeline Support
   • Support teams in building scalable, plugin-based data pipelines.
   • Document best practices for filter/aggregation plugins.

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Overall DevOps Responsibilities

1. Docker Swarm Infrastructure
   • Maintain 3 manager + 2 worker node cluster (src/README.md).
   • Ensure high availability, service placement, and overlay networking.
2. CI/CD Pipeline Maintenance
   • Automate build, test, and deployment.
   • Enforce quality gates (security scans, automated tests).
   • Manage deployment promotion across environments.
3. Observability Stack
   • Maintain OpenTelemetry, Prometheus, Grafana, Loki, and Jaeger.
   • Configure alerts, notifications, and support instrumentation.
4. Security Implementation
   • Enforce HTTPS/SSL for all communications.
   • Support RBAC via Keycloak.
   • Harden SSH (bastion host), firewall, and database configs (docs/ssh-bastion.md).
   • Validate and sanitize all uploaded data.
5. Network & Storage
   • Ensure secure Docker Compose/Swarm network configuration.
   • Use NFS/shared storage for persistent data (docs/shared-storage.md, docs/volumes.md).

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References

• docs/README.md: Full project guide and DevOps roadmap
• diagrams/diagram.md: Architecture diagrams
• tasks/Project.md, tasks/Tasks.md: Team roles and responsibilities
• src/ansible/README.md: OS hardening

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📸 Service Screenshots

🗄️ Database

Screenshot	Description
	PgAdmin Dashboard
	Database Details & Management

View Database

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🛡️ Keycloak

Screenshot	Description
	Keycloak Login Page
	Keycloak Admin Console

View Keycloak

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📊 Grafana

Screenshot	Description
	Main Grafana Dashboard
	Metrics Visualization
	Alerting Overview
	Explore Data
	Settings & Configuration

View Grafana

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🧪 Spark

Screenshot	Description
	Spark Master
	Spark Worker
	Spark History