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Virtualization and Cloud

Jonathan Gershater

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Top Stories by Jonathan Gershater

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 introduction to Brent. Brian responds: "I met Brent few years ago, at a conference, we exchanged business cards and connected on LinkedIn. I don't know him well at all. He probably does not remember me. Sorry, don't think the introduction would be of any use." Solution I suggest that LinkedIn mo... (more)

Brief Summary of IaaS, PaaS, SaaS

In this posting, I summarize my prior three posts on the three cloud computing offerings: Infrastructure as a Service (IaaS), Platform as a Service (PaaS) and Software as a Service (SaaS). I concentrate how the three offerings differ with respect to flexibility, maintenance and portability. One of the greatest challenges companies face when moving to the cloud is security. Thus I will devote an entire blog post in the future, to security concerns. Flexibility How much flexibility do you have with each offering? What can you change or modify within each cloud offering to suit you... (more)

Overview of the OpenStack Cloud

Overview OpenStack is an Infrastructure as a Service offering. (see my prior post for an explanation of IaaS). OpenStack is an OpenSource project, founded by RackSpace, NASA and others. OpenStack can be deployed as a public or private cloud. The OpenStack projects are: CINDER, GLANCE, KEYSTONE, NOVA, QUANTUM, SWIFT. OpenStack Compute: (NOVA) Project NOVA, or OpenStack Compute, provisions and manages on-demand virtual machines and associated resources: CPU, Memory, Disk and Network. Virtual machines can be started, stopped, suspended, created and deleted, while network options for a ... (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 - 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)