Virtualization

Levels of virtualization

Very lightweight: BSD jail, chroot
Lightweight: firejail, uml
Midweight: qemu, unikernels, openvz, containers (lxc, docker), kvm
Heavier: Virtualbox
Heavy (Sit on the iron): Xen, Hyper-V, VMware

History of Virtualization

The original: chroot
BSD's jail and uml
qemu

History of Virtualization

VMWARE
Xen and paravirtualization
KVM

History of Virtualization

firejail
unikernels (though moving processes into the kernel has been going on longer)
lxc, docker

Trends?

Seem to be moving away from heavy approaches to containers and lighter weight concepts