Imagine a FinTech company (like a bank or payment platform) running critical apps.

They need:

• Security 🔒
• High Availability 🏢
• Scalability 📈
• CI/CD automation 🛠
• Multi-cloud disaster recovery 🌎
• Monitoring and compliance 📊

They deploy OpenShift 4.14 like this:

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🧩 Architecture Diagram (High Level)

                 +--------------------------+
                 |     External Clients      |
                 +--------------------------+
                            |
                            ↓
                  Load Balancer (F5/AWS ALB)
                            |
                            ↓
             +---------------------------------+
             |      OpenShift 4.14 Cluster      |
             |  (3 Master + 6 Worker Nodes HA)  |
             +---------------------------------+
                            |
      +---------+---------+---------+---------+---------+
      |         |         |         |         |         |
  Core Apps  Microservices  Monitoring  GitOps/CD  Storage
 (e.g., API, (Payments,       (Prometheus,  (ArgoCD,     (Ceph, EBS,
 Billing UI)  Notifications)   Grafana)      Tekton)      NetApp)

---

🔥 Infrastructure Components

Layer	Details
OpenShift Platform	OpenShift 4.14 running on AWS EC2 (or Bare Metal, Azure, GCP)
Masters	3 Control Plane nodes (HA)
Infra Nodes	2 nodes dedicated for ingress, monitoring, and registry
Worker Nodes	4+ nodes running application workloads
Storage	EBS for dynamic PVCs, Ceph for persistent apps, S3 object storage
Backup	Velero for backup and recovery
Networking	OVN-Kubernetes CNI, secured Ingress, firewall/VPC

---

🛠 What Happens Inside the Cluster

Area	Description
Internal Image Registry	Apps built in CI pipelines are pushed here
ImageStreams	Track versions of app images (dev ➔ staging ➔ prod)
CI/CD Pipelines	Tekton Pipelines build, test, and deploy automatically
GitOps	ArgoCD monitors Git Repos and auto-syncs deployments
Monitoring	Built-in Prometheus, Grafana, AlertManager
Logging	Loki stack or EFK (Elasticsearch, Fluentd, Kibana)
Operators	Certified operators installed for databases (Postgres, Mongo), monitoring, and security
Security	SCCs enforced, Pod Security Admission, OAuth with SSO (Keycloak), network policies applied
TLS everywhere	All apps exposed externally use Let’s Encrypt or company-provided TLS certificates via Ingress Controller
Service Mesh (optional)	Istio/Red Hat Service Mesh for complex apps needing traffic routing, retries, circuit breaking

---

📦 Application Lifecycle

Stage	What Happens
Dev Commit Code	Developer pushes code to GitHub/GitLab
CI Build	Tekton triggers build, builds container image
Push to Dev	Image pushed to internal OpenShift registry, deployed to app-dev project
Promote to Staging	After tests pass, ImageStream tag promoted to app-staging
Promote to Prod	Approval step (manual or automatic) ➔ ImageStream tag promoted to app-prod
Monitoring Alerts	Prometheus tracks app metrics, AlertManager sends Slack/email alerts if thresholds are breached

---

🌐 External Access

• OpenShift Ingress Controller (based on HAProxy) manages incoming traffic.
• Load Balancer (e.g., AWS ALB) in front distributes traffic across multiple router pods.
• Routes expose services securely (HTTPS, TLS termination at edge).

Example public routes:

App	Route
API Gateway	https://api.example.com
Billing App	https://billing.example.com
Admin Dashboard	https://admin.example.com

---

🔒 Security and Compliance Setup

Area	OpenShift Feature Used
Authentication	OAuth server integrated with SSO (Keycloak/LDAP)
Authorization	Role-based access control (RBAC) by projects/namespaces
Network Security	OpenShift NetworkPolicy to isolate apps
Pod Security	SCCs (Security Context Constraints) enforced
Vulnerability Scanning	Quay Clair or Prisma Cloud scans container images
Compliance	OpenShift Compliance Operator runs CIS Benchmarks, PCI scans

---

📈 Real Company Example Flow

Developer commits code ➔
Tekton builds & tests ➔
ArgoCD deploys to dev ➔
QA tests ➔
Promotion via ImageStream ➔
ArgoCD syncs to production ➔
Prometheus monitors everything ➔
AlertManager informs on failures

✅ Minimal human error
✅ Rollbacks easy (previous image tags exist)
✅ Full GitOps-driven deployments
✅ Multi-cloud flexibility (AWS, Azure, GCP)

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🎯 Conclusion: Why Companies Use OpenShift 4.14

Reason	Explanation
Enterprise-ready Kubernetes	Certified platform with support
Security first	Built-in SCC, OAuth, Compliance tools
Automation native	GitOps, Pipelines, Operator Framework
Multi-cloud / hybrid cloud	ROSA, ARO, or on-premises
Easy cluster upgrades	Over-the-air OpenShift upgrades
Developer happiness	Great GUI console, developer tools

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📋 Bonus: Technology Stack in This Company

Stack	Tools
CI/CD	Tekton Pipelines, ArgoCD
Monitoring	Prometheus, Grafana
Logging	Loki or EFK
Storage	EBS, Ceph, S3
Service Mesh (optional)	Istio/Red Hat Service Mesh
SSO	Keycloak, LDAP
Database	Operators for Postgres, MongoDB
Security	Quay Clair, Prisma Cloud, SCCs, Compliance Operator

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🚀 That’s the Real World!

✅ OpenShift is NOT “just Kubernetes” — it’s Kubernetes plus everything companies need to run safely and scale.

✅ OpenShift 4.14 keeps getting closer to pure Kubernetes, but still adds the real-world enterprise features Kubernetes users have to stitch together manually.

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