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)

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)

Identity Management Requirements for the Public Cloud

The Security for Cloud Computing: 10 Steps to Ensure Success white paper provides a practical reference to help enterprise information technology (IT) and business decision makers as they analyze and consider the security implications of cloud computing on their business. The paper includes a list of steps, along with guidance and strategies, designed to help these decision makers evaluate and compare security offerings in key areas from different cloud providers. The paper discusses the threats, technology risks, and safeguards for cloud computing environments, and provides the ... (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)

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)