Virtualization and Cloud

Jonathan Gershater

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Top Stories by Jonathan Gershater

In prior blog posts, I described Infrastructure as a Service (IaaS) and Platform as a Service (PaaS). To recap: If I use IaaS I get servers onto which I can load software and applications which I then maintain, though I don't need to maintain the hardware. I can customize the applications and software running on the servers, at will. If I use PaaS, I get a platform of ready to use web servers, application servers, databases etc. I write my own software application and host it at the PaaS provider. I maintain the software I write, but not the application servers, databases or hardware. I can customize the software I write, at will Finally, we reach the top of the stack: Software as a Service (SaaS). SaaS is simply software that I use for myself or my organization, but often with limited customization. Characteristics of SaaS: SaaS customers are provided with login cre... (more)

Examining Excellent Eucalyptus

Eucalyptus is an open source Infrastructure as a Service cloud offering. What is unique about Eucalyptus is that it is compatible with Amazon AWS APIs. This means that you can: Use Eucalyptus commands to manage Amazon or Eucalyptus instances. Freely move instances between a Eucalyptus private cloud and the Amazon Public cloud to create a hybrid cloud. Eucalyptus leverages operating system virtualization, such as KVM or XEN, to achieve isolation between applications and stacks. Operating system virtualization dedicates CPU and RAM to systems and applications such that they don't ... (more)

Cloud Computing Easily Understood - PaaS

In a previous post, I described Infrastructure as a Service (IaaS). In essence, if I use the service of an Infrastructure provider, who provides hardware: servers, networking, storage and firewalls, it is then incumbent upon me to install and maintain my own applications. However, I don't incur the capital and operating costs of maintaing the hardware and datacenters. To install and maintain web applications in an IaaS model, I typically need to: Install databases, web servers and application servers onto the (virtual) servers provided by the IaaS provider Write or purchase an ap... (more)

AWS - Amazon Web Services - for Newbies

This blog post is a summary of AWS (Amazon WebServices and is gleaned from Jeff Barr's webcast, here: http://youtu.be/CaJCmoGIW24). I will simply explain each box in the above picture, at a high level, and explore further in future blog posts as I delve further into AWS. (AWS is an abbreviation for Amazon Web Services) Amazon Global Physical Infrastructure AZ - Amazon zone - When you create an Amazon instance, you can select a region for your instance - USA, Eerope, AsiaPacific, Government/Federal. Separated zones - provided to allow for separate datacenters, power cooling and hig... (more)

Tutorial: Build a Private Cloud in Twenty Minutes

OpenStack is an open-source cloud framework for building on-demand Infrastructure as a Service. This tutorial in essence distills from this two-page set of instructions for setting up devstack on a single server primarily for use by developers. Hardware I used a DELL 1950 with 8 GB of RAM, internal hard-drives and two 1000 MB NICs. Download and Set Up Ubuntu Download Ubuntu 11.10 from here and burn to DVD Boot the server from the DVD and start the install. I installed the BASE SYSTEM and only one optional package, the OpenSSH Server. I named my server "ubuntu-server" I configured... (more)