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)

Cloud Computing Easily Understood - IaaS

Infrastructure as a Service is one of the three delivery methods of cloud computing (the other two are Platform as a Service and Software as a Service). Users of IaaS have the expertise to maintain operating systems and applications, but don't wish to purchase server, storage and networking hardware and a datacenter to house the hardware. The cloud provider provides these services from a shared pool. The cloud user will then use the virtual machines to fulfill their computing requirements and may install their own operating system and will install their own applications on the v... (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)

Twelve Reasons Why Private Clouds Are Better Than Public Clouds

Joe McKendrick reviews Jason Bloomberg's new book and posits that public cloud is better than private cloud and he provides twelve very valid reasons. Yes, the debate is fierce between private and public..... security, cost, control, compliance In response, here are my twelve reasons why private cloud is better than public Your organization controls the network and infrastructure of a private cloud You don't incur high MPLS costs - network costs to transfer data and workloads between your datacenter and the public cloud You are not susceptible to public cloud outages - Amazon ap... (more)

Introduction to Cloud Computing for Newbies

Cloud computing is a general term for computing services delivered over the Internet, as opposed to computing services hosted inside your own network; on your own premises. These computing services can be as simple as Internet based email or as complex as a Customer Relationship Management (CRM) application. Cloud computing offers cost savings, because users don't have to invest capital budget to purchase hardware and software, nor expend the operating costs of electric power, space and cooling for the hardware and employee costs of maintaining the hardware and software. The maj... (more)