Proxy for multiple cloud instances with multiple portals

HAProxy is a free, very fast and reliable solution offering high availability, load balancing, and proxying for TCP and HTTP-based applications. It is particularly suited
for very high traffic web sites and powers quite a number of the world's most visited ones. Over the years it has become the de-facto standard opensource load balancer, is now shipped with most mainstream Linux distributions,
and is often deployed by default in cloud platforms. Since it does not advertise itself, we only know it's used when the admins report it :-)

Its mode of operation makes its integration into existing architectures very easy and riskless, while still offering the possibility not to expose fragile web servers to the net, such as below :

Squid: Optimising Web Delivery
Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. It reduces bandwidth and improves response times by caching and reusing frequently-requested web
pages. Squid has extensive access controls and makes a great server accelerator. It runs on most available operating systems, including Windows and is licensed under the GNU GPL.

In order to build a proxy to access multiple cloud instances and the multiple portals, a SSH tunnel will be establish to centralized the connections.

ssh -N -fR proxy hub:49003:squid3 vm:3128 sshhub@proxy hub