USING YOUR VIRTUAL MACHINES. An experimenter can prepare their own virtual machines to be part of the experiment: - 6G-SANDBOX will provide base templates consisting of a base installation of popular operating systems. Initially Ubuntu, Debian, Xxxx Linux and FreeBSD will be provided. - Customized versions of the base templates can be developed by the experimenter through the 6G- SANDBOX platform. The customized versions will be included in the 6G-SANDBOX for later use in any experimenter’s TN. - The experimenter can also customize the following attributes of the VM: o CPU topology, including number of NUMA nodes, cores and threads per core o Memory. o QoS requirements, for example to ensure that a predictable number of resources are devoted to the VM. o Scratch storage disks, to store experiment data during the experiment o User data, to pass custom data to the VM (e.g., parameterization parameters or credentials) or execute custom scripts at boot time. o GPU, devices to perform specific processing.