Functional Requirements¶

Overview¶

This document outlines the functional requirements for the RH OVE multi-cluster ecosystem, derived from the architectural decisions documented in our ADRs.

FR-001: Multi-Cluster Management¶

FR-001.1: Cluster Topology Management¶

Requirement: The system must implement application namespace-based topology for workload organization
Rationale: Based on ADR-003, ensures strong isolation, simplified RBAC, and clear resource attribution
Acceptance Criteria:
Support namespace patterns: {app-name}-{environment}
Implement cross-namespace communication policies
Enable namespace-level resource quotas and limits

FR-001.2: Multi-Cluster Governance¶

Requirement: The system must support centralized governance across multiple application clusters from a management cluster
Rationale: Based on ADR-001, provides separation of concerns and operational efficiency
Acceptance Criteria:
Deploy and manage policies from management cluster to application clusters
Support cluster lifecycle management through RHACM
Enable centralized monitoring and logging aggregation

FR-002: GitOps Integration¶

FR-002.1: ArgoCD Hub Architecture¶

Requirement: The system must implement GitOps using ArgoCD in a hub-spoke pattern
Rationale: Based on ADR-002, provides declarative configuration and audit trails
Acceptance Criteria:
Deploy ArgoCD Hub in management cluster with high availability
Support Application of Applications pattern
Enable automated sync for non-production, manual sync for production
Integrate with Git repositories for all infrastructure and application configurations

FR-002.2: Configuration Management¶

Requirement: All infrastructure and application configurations must be stored in Git repositories
Rationale: Ensures version control, auditability, and rollback capabilities
Acceptance Criteria:
Support environment-specific overlays using Kustomize
Enable automated deployment pipeline with proper approval workflows
Provide drift detection and automatic remediation

FR-003: Admission Control and Policy Management¶

FR-003.1: Layered Admission Control¶

Requirement: The system must implement layered admission control using OpenShift built-in controllers, KubeVirt webhooks, and Kyverno policies
Rationale: Based on ADR-004, provides flexible, secure, and policy-driven resource validation
Acceptance Criteria:
Deploy Kyverno for custom policy management
Implement Security Context Constraints for VM and container workloads
Support policy-as-code with version control and automated deployment

FR-003.2: Security Policy Enforcement¶

Requirement: The system must validate and enforce security policies before resource persistence
Rationale: Prevents misconfiguration and ensures compliance
Acceptance Criteria:
Support both blocking and warning policy modes
Provide detailed policy violation reporting
Enable policy exemptions with proper approval workflows

FR-004: Networking and Connectivity¶

FR-004.1: Cilium CNI Implementation¶

Requirement: The system must use Cilium as the primary CNI with eBPF-powered networking
Rationale: Based on ADR-005, provides superior performance, identity-aware security, and L7 capabilities
Acceptance Criteria:
Deploy Cilium with Hubble for network observability
Implement identity-aware network policies
Support transparent encryption using WireGuard
Enable service mesh capabilities without sidecar proxies

FR-004.2: Multi-Network Support¶

Requirement: The system must support Multus for multi-network configurations
Rationale: Enables legacy network integration, SR-IOV, and network segmentation
Acceptance Criteria:
Support NetworkAttachmentDefinitions for management, storage, and data networks
Enable multiple network interfaces for VMs
Support VLAN-based network segmentation
Provide high-performance networking with SR-IOV

FR-004.3: Zero Trust Security¶

Requirement: The system must implement zero trust network principles
Rationale: Ensures security by default with explicit allow policies
Acceptance Criteria:
Implement default-deny network policies
Support L7 HTTP/HTTPS policy enforcement
Enable network flow monitoring and policy violation alerting

FR-005: Backup and Disaster Recovery¶

FR-005.1: Centralized Backup Management¶

Requirement: The system must implement centralized backup using Rubrik for unified VM and container workload protection
Rationale: Based on ADR-006, provides consistency, compliance, and operational efficiency
Acceptance Criteria:
Deploy Rubrik management in management cluster
Support policy-driven backup scheduling and retention
Enable application-consistent snapshots for VMs
Provide deduplication and compression for storage optimization

FR-005.2: Disaster Recovery Capabilities¶

Requirement: The system must support cross-region disaster recovery and failover
Rationale: Ensures business continuity and meets compliance requirements
Acceptance Criteria:
Support automated backup replication to cloud storage
Enable point-in-time recovery for critical workloads
Provide recovery testing and validation capabilities
Support cross-cluster failover scenarios

FR-006: Monitoring and Observability¶

FR-006.1: Integrated Monitoring Stack¶

Requirement: The system must implement integrated monitoring using Prometheus, Grafana, Dynatrace, and Hubble
Rationale: Based on ADR-007, provides comprehensive observability across infrastructure and applications
Acceptance Criteria:
Deploy federated Prometheus for metrics collection across clusters
Implement custom Grafana dashboards for infrastructure and application metrics
Integrate Dynatrace for full-stack application performance monitoring
Enable Hubble for network flow visibility and security monitoring

FR-006.2: Proactive Monitoring and Alerting¶

Requirement: The system must provide proactive monitoring with intelligent alerting
Rationale: Enables early detection and resolution of issues
Acceptance Criteria:
Support threshold-based and anomaly detection alerting
Integrate with incident management systems
Provide runbook automation for common issues
Enable custom alerting rules per application namespace

FR-007: Virtual Machine Management¶

FR-007.1: VM Lifecycle Management¶

Requirement: The system must support complete VM lifecycle management using KubeVirt
Rationale: Provides unified management of VMs and containers
Acceptance Criteria:
Support VM creation, scaling, and termination
Enable VM live migration for maintenance
Provide VM template management and cloning
Support both Windows and Linux guest operating systems

FR-007.2: Storage Management¶

Requirement: The system must provide flexible storage management for VMs using DataVolumes and CDI
Rationale: Enables efficient storage provisioning and management
Acceptance Criteria:
Support multiple storage classes for different performance tiers
Enable volume expansion and snapshotting
Provide image import from registries, HTTP, and S3 sources
Support persistent volume cloning for template workflows

FR-008: Security and Compliance¶

FR-008.1: Identity and Access Management¶

Requirement: The system must integrate with enterprise identity providers using OIDC for centralized authentication and authorization
Rationale: Based on ADR-008, ensures consistent security policies, audit trails, and enterprise integration
Acceptance Criteria:
Deploy Keycloak (Red Hat SSO) as primary OIDC provider with HA configuration
Support LDAP/Active Directory federation for existing user directories
Implement Single Sign-On (SSO) across all clusters and services
Deploy Dex OIDC proxy for service authentication
Integrate OpenShift OAuth with OIDC claims mapping
Implement namespace-based RBAC with OIDC group delegation
Enable service account automation with time-limited tokens (15min-2hours)
Provide comprehensive audit logging for all authentication and authorization events

FR-008.2: Multi-Factor Authentication and Security Controls¶

Requirement: The system must enforce multi-factor authentication and implement comprehensive security controls
Rationale: Based on ADR-008, ensures zero trust security principles and enhanced threat protection
Acceptance Criteria:
Enforce mandatory MFA for all administrative accounts using TOTP/SMS
Implement token security with proper expiration policies (access: 15min, refresh: 1hour, ID: 5min)
Deploy network policies restricting authentication service communication
Support TLS 1.3 encryption for all authentication traffic
Enable certificate-based mutual TLS for service-to-service communication
Implement automated user provisioning/deprovisioning via SCIM integration
Support self-service password reset and MFA device management

FR-008.3: Compliance Management¶

Requirement: The system must support automated compliance checking and reporting with IAM integration
Rationale: Ensures adherence to regulatory requirements with comprehensive identity audit trails
Acceptance Criteria:
Support SOC 2, GDPR, and HIPAA compliance frameworks with identity-aware controls
Enable automated compliance scanning and reporting with authentication metrics
Provide policy violation tracking and remediation workflows
Support data classification and handling policies
Generate automated access review reports with RBAC analysis
Track failed authentication attempts and security incidents
Support "right to be forgotten" with automated user data deletion

FR-009: Developer Experience¶

FR-009.1: Self-Service Capabilities¶

Requirement: The system must provide self-service capabilities for development teams
Rationale: Improves developer productivity and reduces operational overhead
Acceptance Criteria:
Provide web-based interfaces for resource management
Support CLI tools for automation and scripting
Enable template-based resource provisioning
Provide comprehensive documentation and tutorials

FR-009.2: CI/CD Integration¶

Requirement: The system must integrate with existing CI/CD pipelines
Rationale: Enables automated testing and deployment workflows
Acceptance Criteria:
Support webhook integration with Git repositories
Enable automated image building and scanning
Provide integration with popular CI/CD tools (Jenkins, GitLab CI, etc.)
Support blue-green and canary deployment strategies