CRI-O is an open-source container runtime built specifically for Kubernetes. It implements the Kubernetes Container Runtime Interface, so cluster nodes can start and manage OCI-compliant containers and pull images from any compliant registry. The project documents its use with minikube and kubeadm. It is an alternative to general-purpose container engines on the nodes of a cluster that the organisation runs itself.
The Cloud Native Computing Foundation (CNCF) accepted the project at incubating level in 2019, and it moved to graduated status in July 2023. The CNCF is part of the Linux Foundation, a US non-profit, so governance sits in the United States even though the code is community-driven. The source code is available under the Apache 2.0 licence, so a European organisation can review, modify and operate the software on its own infrastructure. Dependence on a US-based foundation for this layer of the platform is the main sovereignty consideration.