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Overview

Supercloud is a cloud architecture that enables application migration as a service across different availability zones or cloud providers. The Supercloud provides interfaces to allocate, migrate, and terminate resources such as virtual machines and storage and presents a homogeneous network to tie these resources together. The Supercloud can span across all major public cloud providers such as Amazon EC2, Microsoft Azure, Google Compute Engine, and Rackspace etc., as well as private clouds. Supercloud users have the freedom to re-locate VMs to many data centers across the world, irrespective of owner and without having to implement complex re-configuration and state re-synchronization in their applications. Using the Supercloud, an application can easily offload from an overloaded data center to another one with a different infrastructure.

In implementing support for live application-level VM migration we had to address various challenges relating to heterogeneity, networking, and storage. The Supercloud leverages nested virtualization, eliminating the need for VM management support from underlying providers. We designed and implemented a new distributed storage system optimized for wide-area cross-provider VM migration. It decouples providing strong consistency from update propagation, improving latency while reducing overhead. We deploy a high performance Software-Defined Network (SDN) built with Open-vSwitch and VXLAN (Virtual Extended LAN) tunnels crossing cloud boundaries and a Frenetic controller. We also designed and evaluated various solutions to deal with migrating services that use public IP addresses. The Supercloud runs the OpenStack platform and appears to users as a single private OpenStack cloud. A new scheduler monitors workload and automatically determines the optimal location for running services.

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