Preferred Networks operates the multi-tenant Kubernetes-based PFCP cloud for AI/ML workloads. This talk covers isolation (RBAC enforcement, host/process/data separation, network isolation), fair resource control, and billing on a shared cluster, plus accelerator support for AI/ML and RDMA/HPC, and how the system scales across sites. Event site: https://www.media.kyoto-u.ac.jp/accms_web/event/3427.html