Technical Documentation

Level 2: Technical Implementation

Architecture patterns, infrastructure templates, security baselines, and provider-specific guides for implementing sovereign cloud infrastructure.

Audience: Solutions Architects, Technical Leads, DevOps Engineers, Security Architects, Platform Engineers.

Prerequisite: Familiarity with Level 1 Strategic Framework, particularly the Architecture Principles and Reference Architecture.

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Technical Sections

Infrastructure Templates

OpenTofu modules, Kubernetes configurations, Helm charts, and GitOps setup for sovereign cloud infrastructure.

OpenTofu | Kubernetes | Helm | ArgoCD

Migration Patterns

Proven patterns for migrating workloads including lift-and-shift, refactoring, and workload-specific guides.

Databases | Containers | Email | Storage

Security Hardening

Security baselines, encryption configuration, identity federation, and compliance automation.

Zero Trust | Encryption | IAM | Compliance

Operational Runbooks

Incident response, disaster recovery, change management, and capacity planning procedures.

SRE | DR | Monitoring | On-Call

Transition & Coexistence

Managing projects in-flight, extended parallel operation, data synchronisation between clouds, and industry lessons learned.

Dual-Run | CDC | Contract Exit | Case Studies

Provider Guides

European provider-specific configuration, evaluation criteria, and comparison matrices.

OVHcloud | Hetzner | Scaleway | IONOS

CloudStack Use Cases

Building sovereign hyperscalers with Apache CloudStack, open-source FaaS, and international cooperative implementation models.

CloudStack | OpenFaaS | Cooperative Model

Existing Microsoft Replacements

Proven implementations from Denmark, Schleswig-Holstein, France, Italy, and Spain. 450,000+ workstations migrated. Harvestable by the Cooperative.

NEW: GendBuntu | LinEx | LiMux lessons

Technology Validation

Independent assessment of CloudStack and open-source stack maturity. Honest risk analysis, OCI Dedicated Region alternative, acceptance criteria.

CRITICAL: Read before approving investment

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Core Technology Stack

Level 2 documentation is built around the following sovereign-compatible technology stack. All components are open source or available from non-US providers.

Layer	Primary Technology	Alternatives
Container Orchestration	Kubernetes (vanilla)	K3s, Rancher, OpenShift (OKD)
Infrastructure as Code	OpenTofu	Pulumi, Crossplane
GitOps	ArgoCD	Flux
Object Storage	MinIO	Ceph RADOS Gateway, SeaweedFS
Database	PostgreSQL	MariaDB, CockroachDB
Cache	Valkey / Redis	KeyDB, Dragonfly
Message Queue	Apache Kafka	RabbitMQ, NATS
Identity & Access	Keycloak	Authentik, Zitadel
Secrets Management	OpenBao	SOPS, Sealed Secrets
API Gateway	Kong	Traefik, APISIX
Service Mesh	Istio	Linkerd, Cilium Service Mesh
Monitoring	Prometheus + Grafana	VictoriaMetrics, Thanos
Logging	Loki + Grafana	OpenSearch, Graylog
SIEM	Wazuh	OpenSearch SIEM
CI/CD	GitLab CI (self-hosted)	Tekton, Jenkins
Container Registry	Harbor	GitLab Registry, Quay

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Getting Started

Recommended Reading Order

1. Provider Guides
   Understand the European provider landscape and select your target platform(s).
2. Infrastructure Templates
   Review the OpenTofu modules and Kubernetes configurations for your chosen provider.
3. Security Hardening
   Understand security baselines and compliance requirements before deployment.
4. Migration Patterns
   Select the appropriate pattern for your workload types.
5. Operational Runbooks
   Prepare for day-2 operations including incident response and DR.

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Development Status

Section	Status	Content Available
Infrastructure Templates	Structure Only	Index page, section outline, template placeholders
Migration Patterns	Structure Only	Index page, pattern descriptions, workload categories
Security Hardening	Structure Only	Index page, security domains, baseline outline
Operational Runbooks	Structure Only	Index page, runbook categories, procedure outline
Provider Guides	Structure Only	Index page, provider overview, evaluation criteria
CloudStack Use Cases	Complete	Hyperscaler architecture, 11 use cases, AWS service mapping, FaaS alternatives, international cooperative model
Existing Microsoft Replacements	Complete	Denmark, Schleswig-Holstein, France GendBuntu, Italy, Spain LinEx/Guadalinex, Munich lessons, EU OSOR resources
Technology Validation	Complete	CloudStack production evidence, scalability testing, CloudStack vs OpenStack vs OpenNebula comparison, OCI Dedicated Region alternative, risk assessment, acceptance criteria

Contributing: Level 2 documentation will be developed iteratively as pilot implementations proceed. Technical teams undertaking early migrations are encouraged to contribute patterns, templates, and lessons learned.

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