DSL is an overloaded acronym standing for many different things. I first knew it as Digital Subscriber Line for Internet connection, and then Domain Specific Language. Recently I learnt a new one: Damn Small Linux. As you see the word small, you may think it’s for embedded system. It’s not.
This week I spent some time deploying a Web application I developed using Microsoft Visual Web Developer 2010 Express (it’s free). For that, I installed Microsoft Internet Information Service (IIS) on my Windows 7 enterprise edition. This turned out pretty straight-forward: Control Panel – Programs – Turn Windows Features on or off. In the Windows Features dialog box, just locate the Internet Information Service and check on it. After a click on the OK button, the IIS (version/build is IIS 7.5.7600.16385) was installed.
Social networking has been the hottest area after the dot.com burst. User base is still a critical factor and far more sticky than before. It’s the connections among these users that differentiate social networking from other types of Internet services.
A connection is formed from one user to another. They cannot be on two different web sites, even though theoretically they can. Technically we can define protocols to link users, even groups, together from different sites. But it is not efficient and may not be fast enough to sync up states and discover new connections. Even more issues on business side, not to mention privacy policies.
In a recent experiment, I needed to get the VMware Tools installer. Somehow after searching many different places, I couldn’t find it. While writing this article, I found a link to all the installers organized per ESX versions and CPU architectures. The installers are single files, different from an installable CD which I hacked.
Just finished reading the book The Art of Scalability: Scalable Web Architecture, Processes, and Organizations for the Modern Enterprise by Martin Abbott, Michael Fisher. The book draws on authors’ experiences working at PayPal/eBay and other Internet companies, and covers many aspects of scalability including people, organization, process, and technology. According to Yishan Wong, who used to work under the authors and is now an engineering director at Facebook, “the opportunity to directly absorb the lessons and experiences presented in this book is invaluable to me now working at Facebook.”
If you have read my previous article on vSphere security model, you know how it works. Still, you may wonder what roles a particular user may have, as asked in a recent email from one of my former VMware colleagues.
In an operating system, a user is assigned to a group or multiple groups therefore granted a certain permissions. In vSphere, a role is simply a set of privileges and that is it. It’s natural to think of a role as a group sometimes, but it’s really not.
Last month a question was raised in our open source vSphere Java API forum regarding an exception during HostSystem.getSummary() method call. As you can see from the stack trace, the actual exception was “org.dom4j.DocumentException.”
Recently I upgraded my computer and got into all sorts of issues. I first ordered an Intel Core i7 based desktop and a 24’ monitor from Costco website. I know desktop is not the most popular one these days, but for me it’s still the most effective one for programming, writing. For one thing, the tablet even laptop screen is way too small to be productive for coding and blogging. Tweeting may be a different story. But then why would you need a tablet if you can use a smart phone for tweeting? Anyway that is a different topic that doesn’t belong here.
While checking out the exhibitions at CloudExpo weeks ago, I learned about the Red Hat Enterprise Virtualization (RHEV) 3.0. Due to my interest in virtualization APIs, I started to look into its management APIs. With no surprise these days, it’s a REST API.
After installing the UCS emulator, I started to read and try UCS management APIs. I found the following two documents very helpful: Cisco UCS Manager API Management Information Model, and Cisco UCS Manager XML API Programmer’s Guide.
Key Concepts
The key concepts of the APIs are pretty similar to VMware vSphere API. For example, it has managed objects which represent UCS resources like chassis, blades, fabric interconnects, etc. They contain administrative states and operational state.
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