Architect Multi-Tenant Zero-Trust Network and Service Segmentation
Duration: ~30 minutes
Overview
Design and implement a comprehensive zero-trust network architecture for multi-tenant OpenShift environments. You will architect service mesh mutual TLS (mTLS), implement layered NetworkPolicies, configure multi-network CNIs, establish egress governance, and apply zero-trust patterns to ensure complete network segmentation and isolation.
Design layered zero-trust networking with NetworkPolicies, mTLS, and egress controls, then validate that tenants and services stay isolated.
Why it matters
Multi-tenant environments require strict network isolation to prevent lateral movement and data exfiltration. Zero-trust networking assumes no implicit trust between services, requiring verification for every connection. This lab demonstrates how to architect a comprehensive zero-trust network that protects against:
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Lateral movement attacks
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Unauthorized service-to-service communication
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Data exfiltration through uncontrolled egress
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Network-based privilege escalation
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Cross-tenant data access
What does it solve
Traditional network security relies on perimeter defense and implicit trust within the network. Zero-trust architecture eliminates these assumptions by:
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Requiring authentication and authorization for every connection
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Implementing micro-segmentation at the service level
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Enforcing least-privilege network access
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Providing visibility into all network flows
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Enabling granular policy enforcement
Your Mission
Assume a foothold will try lateral movement. Build layered NetworkPolicies, mTLS, and egress controls that keep tenants and services isolated even when one pod is owned.
Understanding the Architecture
| Component | Purpose | OpenShift/K8s Implementation |
|---|---|---|
Service Mesh mTLS |
Encrypt and authenticate all service-to-service traffic |
Service Mesh (Istio/OSSM) with mTLS enabled |
Layered NetworkPolicies |
Defense-in-depth network segmentation |
Multiple NetworkPolicy layers (namespace, pod, service) |
Multi-Network CNIs |
Isolated network planes for different workloads |
Multus CNI with multiple network attachments |
Egress Governance |
Control and monitor outbound traffic |
Egress NetworkPolicies, EgressIP, Egress Firewall |
Zero-Trust Patterns |
No implicit trust, verify everything |
Policy-driven access control at every layer |
Lab Content
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This lab is currently under development. Content will include:
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Prerequisites
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OpenShift cluster with cluster-admin access
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Service Mesh Operator installed
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Multus CNI plugin available
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Understanding of NetworkPolicies and service mesh concepts
Debrief
Multi-tenant zero-trust networking assumes a foothold and designs layered stop-points: NetworkPolicies, mesh mTLS, Multus/egress governance—not a single flat allow.
What this module targets:
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Tenant segmentation blueprints
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Service mesh mTLS and identity-aware paths
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Egress and multi-network controls
Until full exercises land: draw your east-west trust zones and mark where default-deny already exists versus open namespaces.
