Open source is not an option. It is the architecture.
Yorizon Cloud runs on the Sovereign Cloud Stack - the open European cloud reference architecture. Auditable. Forkable. No vendor approval required.
Open source is not an option. It is the architecture.
Yorizon Cloud runs on the Sovereign Cloud Stack - the open European cloud reference architecture. Auditable. Forkable. No vendor approval required.
Open source is not an option. It is the architecture.
Yorizon Cloud runs on the Sovereign Cloud Stack - the open European cloud reference architecture. Auditable. Forkable. No vendor approval required.
Why we build on open source - and what that means for you.
What is the Sovereign Cloud Stack?
The Sovereign Cloud Stack (SCS) is Europe’s open cloud reference architecture. Initiated in 2019 by the OSBA, supported by the BMWK, and since 01/01/2025 maintained by the Forum SCS Standards. In March 2026, the IT Planning Council made the SCS standards binding for the Germany Stack. Yorizon is one of the 14 founding members of the forum.
Why not a proprietary hypervisor?
We run KVM and OpenStack Nova. Vendor licenses can be renegotiated, made more expensive, or withdrawn - open-source code cannot. If a provider is acquired or makes a strategic U-turn, your cloud infrastructure still stands. That is the hard difference between license law and control rights.
Do we need open-source experts on the team?
No. Yorizon operates the stack fully managed. You use standard APIs (OpenStack, Kubernetes, S3), Terraform providers, and standard CLIs — as if it were a classic cloud service. We maintain, harden, and upgrade the OSS stack.
How does this prevent vendor lock-in?
Open standards mean portability. Your workloads run on Yorizon, on STACKIT, on plusserver, on any SCS-compliant cloud — without a rebuild. Same APIs, same images, same Terraform modules. Switching is a migration, not an architecture project.
What does Made in Germany mean technically?
German legal entity (a HOCHTIEF subsidiary), no US corporate group, no access under the Cloud Act, EU-only data residency, timber-built data centers powered by renewable energy. Hardware supply chain from the EU. Operations in Germany — no personnel from third countries with platform access.
Five open building blocks. No black box in between.
OSISM: Deployment engine for OpenStack, Ceph, Kubernetes, and IAM. OSISM GmbH, Apache-2.0.
Sovereign Cloud Stack: Open reference architecture for OpenStack and Kubernetes. Mandatory for the Germany Stack since March 2026.
OpenStack Nova + KVM: Industry standard for virtualization. KVM as a European open-source hypervisor — no VMware, no Hyper-V licensing risk.
Neutron SDN: OpenStack Neutron with OVN as the SDN controller and Geneve overlay. Multi-tenant network segmentation, provider networks, load balancing.
Ceph: Block storage, S3-compatible object storage, and CephFS from a horizontally scalable cluster.
Sovereignty is more than just a logo
Founding member of the Forum SCS Standards
Member of ALASCA e.V.
Platinum sponsor of SCS Summit 2026
Contribution to the SCS reference architecture
Legal - German legal personality, no U.S. corporate group affiliation, no CLOUD Act. Contracts and data under German and European law.
Freedom of Choice — Open standards mean portability. Provider switching without reimplementation. No vendor approvals, no license cliffs.
Technological — The code is auditable, peer-reviewed, and forkable. Security is demonstrable — not just promised.
Competence — cloud operations knowledge is being built in Europe — with us, with our partners, and with our customers.
Open cloud. Sovereign operations. Your stack.
Talk to our architecture team about your workload - we show where the stack becomes auditable and where you can leave lock-in today.
