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Provision VMs in QEMU, using ZFS clones for virtual disks
These scripts run from any webserver (eg, nginx) on a FreeBSD host with a zpool configured. VMs are cloned from ZFS snapshot and exported via iSCSI. A qemu process on a (linux) hypervisor host is created via ssh (keys), with the qemu process being the iSCSI initiator.
Karesansui is an open-source virtualization management application made in Japan. It's smart graphical user interface lowers your management cost, and brings a total management/audit solution for both physical and virtual servers. Full featured RESTful interface allows customizing and integration with other management/billing systems.