Welcome!

Virtualization and Cloud

Jonathan Gershater

Subscribe to Jonathan Gershater: eMailAlertsEmail Alerts
Get Jonathan Gershater via: homepageHomepage mobileMobile rssRSS facebookFacebook twitterTwitter linkedinLinkedIn


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)

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)

Security in the Public Cloud Is a Shared Responsibility

When you host applications in the public cloud, you assume partial responsibility for securing the application. The cloud provider, for example Amazon Web Services (AWS), secures the physical data center (with locked badge entry doors, fences, guards etc) in addition to securing the physical network with perimeter firewalls. This is no significant change from how you secure your corporate datacenter. Just like you enhance the security of physical and virtual servers in your datacenter with host-based firewalls (ip tables, Windows firewall), anti-virus and intrusion detection, so... (more)

The Key to Effective Demonstrations of a Technology Solution

Have you ever been invited to present a product solution and within a few minutes the audience is thumbing on their mobile devices? Have you ever presented to a remote audience and asked the end "any questions?" and there are none? Here are some tips for giving a great demo. (Credit to this material goes to Peter Cohan of The Second Derivative who presented this material at a workshop I attended and have me permission to write a summary) What is a bad demo? "Let me show this awesome product and all its cool features." What is a good demo? Presentation of specific product functions ... (more)

Add Some Fuel to Quickly Deploy OpenStack

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"... (more)