Hyper: Make VM Runs Like Container Xu Wang <
[email protected]> Hyper HQ Agenda • Lesson learned from docker • Hyper: App-centric VM • Hyper and Xen • Next step Docker Seems to Beat VM Everywhere • Docker announced in 2013 and release 1.0 in 2014 • Both AWS and Google provide Docker service in 2014, ECS and GKE • Several Linux distros for Docker • Hot in both VC and developer • …… Lessons Learned from Docker • Docker is amazing • It build, ship, and run apps • Docker is not simply a new container • At the very beginning, Docker = LXC (runtime) + AUFS (image) • The amazing part: Docker is app-centric • People need run app, rather than a traditional OS • The critique of virtual machine is about "machine" rather than "virtual" The Critique of VM • The critique of virtual machine is about "machine" rather than "virtual" • Why not make an App-Centric VM Hyper: App-Centric VM • Hyper = Hypervisor + Docker Image How It Works • In short: change the Docker container runtime to hypervisor. • A bit more detailed: • Maintain Images, volumes in host • Launch guest with a slim kernel and a special initrd (hyperstart) • Pass images, volumes, nic to guest • When Init ready, give init a spec of containers to run on it • Init mount images and run processes as described in the spec • Then it works. The Architecture Pod App, App, App, App, (Docker Image) (Docker Image) (Docker Image) (Docker Image) Initrd:,Hyperstart Initrd:,Hyperstart Hyperd Light,Kernel,on,Hypervisor Light,Kernel,on,Hypervisor Compare with Container Hyper is Hypervisor-Agnostic • Currently, support: Qemu/KVM, Xen, and VirtualBox • Xen and KVM are the most widely adopted cloud hypervisors • VirtualBox is an open source cross platform hypervisor • Hyper introduce a hypervisor abstract layer, a Hypervisor driver should have • device hot-plug • serial ports for init communication, tty, and optional console • better to have filesystem share, which is massively used by Docker.