Virtualization and Cloud

Jonathan Gershater

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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 application Deploy and maintain the application These applications are thus platform specific. An application written/purchased to run on Windows, Unix or Linux, within the IaaS environment, is dependent on the platform. If an operating system is patched or modified, the IaaS customer's applic... (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)

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)

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)

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)