Amazons virtual privacy cloud service (VPC) offers great outsourcing possibilities for your less private (but still private) services.
Consider a Jenkins build server. You have got one on your local machine but sometimes it’s just too much load for your hardware. It would be nice in such a case to just push some load into the cloud. Clearly you can not just put a Jenkins server into the cloud because it will need access to various services like at least some repository (Git, SVN). To protect that cloud-internal traffic (you do not want other Amazon customers to see your source code) one should use VPC. And for a seamless integration into your existing infrastructure you will need a VPN tunnel from the Amazon VPC to your local network.
Amazon offers the possibility to create such a VPN connection to your VPC. You may set up your own VPN server in your VPC but in our opinion it is easier and cheaper to use Amazons solution. Because it seemed less pricy we first tried to just use open-source software for that VPN server.