SecNumCloud and BSI C5 on One Kubernetes Platform: Can You Really Avoid Two Stacks?

SecNumCloud and BSI C5 can be addressed through one shared Kubernetes platform and delivery process, but they require separate hosting footprints because SecNumCloud is an ANSSI qualification held by specific cloud providers and services, with EU sovereignty and extraterritorial-law requirements, while BSI C5 is an ISAE 3000 attestation that can cover a company’s own cloud service on many providers. For French public-sector workloads within SecNumCloud scope, organizations should use a dedicated cluster in an ANSSI-qualified environment, while German and other enterprise workloads can run in a standard EU cloud cluster; shared GitOps workflows, manifests, RBAC models, policies, image-signing processes, and audit tooling can operate both. Data, backups, secrets, logs containing personal information, ingress, and identity boundaries should remain separated by footprint, and organizations must carefully document control-plane access, staff jurisdiction, vendor support, and service dependencies. Most security evidence for SecNumCloud, C5, ISO 27001, and SOC 2 can be reused through automated records for access control, changes, logging, encryption, patching, backups, and incident response, though SecNumCloud’s provider ownership and jurisdiction requirements remain unique. The approach reduces costs compared with operating two independent stacks, but qualified providers may have narrower managed-service options and require greater operational effort. Qovery is presented as a tool for deploying consistently to customer-owned sovereign and conventional clusters, but it neither grants SecNumCloud qualification nor provides a C5 attestation.

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