Virtualization and Cloud

Jonathan Gershater

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Top Stories by Jonathan Gershater

OpenStack is an OpenSource offering of Infrastructure as a Service (IaaS). For a review, here is a quick overview of IaaS and OpenStack. OpenStack is admittedly not trivial to manually install. I have started a manual install beginning with the Identity Service (keystone) here, other modules to follow. To simplify the deployment of OpenStack some organizations and vendors offer scripts or downloads: OpenStack offers a scripted install Dell open-sourced crowbar RackSpace offers Alamo Mirantis offers Fuel which I will cover in this article. Fuel from Mirantis, is basically a "DIY" or Do It Yourself kit to accelerate your deployment of OpenStack. Fuel gives you: Free access to a step-by-step deployment guide Guidance on optimal hardware configuration and logical deployment. Pre-built automation for a range of proven deployment designs. Fuel allows you to use a configura... (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)

Cloud Computing Easily Understood - SaaS

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 ha... (more)

The Fundamental Flaw with LinkedIn Connections

Assumption A first-degree direct LinkedIn connection implies that the two parties know each well. Problem Using this assumption, two unconnected LinkedIn users attempt to connect via an intermediary. What often happens is that the first degree connections are in fact very weak connections, and thus of no use to the third party attempting to connect via the intermediary. Example I log into LinkedIn and would like an introduction to Brent. I view Brent's profile and notice that his first degree connection, Brian, is also a first degree connection with me. So I ask Brian for an int... (more)

High Availability, Fault Tolerance and Disaster Recovery in AWS

Amazon Web Services – Disaster Recovery, High Availability and Fault Tolerance Abbreviations used: AWS - Amazon Web Services AMI - Amazon Machine Instance DR - Disaster Recovery FT - Fault Tolerance HA - High Availability Non-technical introduction. High Availability and Fault Tolerance – the requirement that a computer application be seemlessly available to users without interruption, literally “no (or very little) fault will be tolerated”. In simple speak, this means that I am able to use a computer application even though in the background there may be outages, for example har... (more)