You can now run GNS3 in the cloud with Packet.
Packet.net is a bare metal cloud provider, with datacenter locations near NYC, Silicon Valley, Amsterdam and Tokyo.
See here for more information:
https://www.packet.net/resources/partners/gns3/
http://docs.gns3.com/1IyRZzUYKOe9DzR8YJXO33ONeoZwlkIm0ciHIYuqGFwM/index.html#h.n46kb0kjaafg
