On 02/09/2016 12:30 AM, Damian Nowak wrote:
if I understand the offering of Amazons cloud service correctly, there, you can install an
OS, say arch, on a virtualized machine and scale CPU, RAM, etc. freely up and down just as
you need it.
Well, yes and no. You can scale up resources (e.g. increase RAM) but this requires a full
restart of your virtual machine. See:
https://serverfault.com/questions/591533/can-ec2-instances-dynamically-add-ram-while-running
Moreover, adding more and more resources will stop working at some point. That's why you'd
be looking to add several independent virtual machine running your application (Amazon
EC2), which connect to one big database (another Amazon EC2), and put all of those
computing machines in from of a load balancer (Amazon ELB).
While I can to this using e.g. KVM+qemu on a single machine, I want to be able to bind
together a bunch of machines such that they appear as a single big machine. Is there a way
to do this?
You can achieve it with both solutions, is it Amazon (EC2+ELB), or your own dedicated
server(s) where you'll be likely to use KVM for virtualization and HAProxy, nginx or other
solutions for load balancing.
From a technological point of view, both ways are the same.
Thanks for your answer. I still try to wrap my head around the topic, so
some of my assumptions my not hold. To me it sounds, that the proposed
approach only works for web-apps running in a http-server, since the
load balancing is done via HAProxy and nginx.
For my needs, I want to run "usual" software, specifically R, the
statistics language. Utlimately, I want to bind several physical hosts
together to appear as one host on OS level, such that e.g. htop would
show the total number of cores accross all bound boxes.
