The High availability clusters are computer clusters which are implemented mainly for the purpose of improving the availability of the services. The high availability clustering detect hardware/software faults, and instantly restart the application on another system without requiring administrative intercession, this process is commonly known as a Failover process. It has functionality that provides failover from one node to another if the current node becomes unavailable, a failover cluster appears on the network as a normal application, but it has additional functionality that increases its availability in case one server fail.

The clustering software may configure the node before starting the application on it. To run the system smoothly it require appropriate filesystems to be imported and mounted and  to set-up cluster rules that enable a common set of configurations also network hardware may have to be configured, and some supporting applications may need to be running as well.

Diagram: HA Cluster network (2 node)

The purpose of HA clusters to utilize all available techniques to make the individual systems/shared infrastructure as reliable as possible. The high availability clustering should include the following;

* Build redundancy into a cluster.

* Redundant network connections so that a switchover or network interface failures do not result in network outages.

* Disk mirroring to avoid system crashes in case of failure of internal disks.

* SAN data connections.

* Redundant electrical power inputs.

The high availability  clusters usually use a critical clustering in private network connection which is used to monitor the status of each node in the cluster. Such clustering are often required for critical databases,  business applications, file sharing on a network and customer services such as e-commerce websites.

What is VPS

A Virtual Server shares its resources with multiple users providing fully functioning Web Server that resides within the same physical location of a true Web Server, multiple virtual servers can reside on a single Web Server, it allow hosting a number of sites simultaneously, each with a unique domain name and IP address, VPS are independent with their own operating system and resources.

What is Burstable Memory

Each Virtual Private Server has a guaranteed amount of RAM, your host always guaranteed a certain amount of system resources, as the usable memory, out of the memory available in VPS. Burstable memory set a maximum limit for the memory available  so in case if the guaranteed memory is exhausted, the users of VPS can use the memory up to the limit of burstable memory, for example if the guaranteed memory of a VPS is 512mb and the burstable memory limit is 1024 mb, the users can use the remaining 512MB RAM once their guaranteed memory is completely used up.

This is possible only if the host server has that much memory available with it, however it is always best not to use the burstable memory unless it is emergency.Bursted memory are not guaranteed but it can be allocated to any VPS that may need it as long as it is available on the box at that time. So as long as those resources are available, as a user you can be able to go over that limit of guaranteed RAM.

While looking for VPS server you should make proper analysis of the memory availability considering the VPS provider that work to make sure that an ample amount of burst resources are always available on each host machine. In case if your VPS constantly requires greater resources than your allocated guarantees memory, you should upgrade your account.

The shopping carts built up on the ASP.Net platform incorporate varieties of functionality that include shipping rate & Tax calculation ability and real time interaction with the customers. ASP.net technology built up shopping cart provides user friendly interface that include a secure check-out process and enhance user shopping experience with varieties of interactive features. Such technology allows developers to create e-commerce store which are more flexible, search engine friendly and secured. Overall, the  ASP.net built up shopping cart provide you Powerful product management system and portal setting up- e-commerce site.

The administrative features backed with a scalable architecture make such cart quite popular amongst users. The  ASP.NET framework support database friendly languages like MS-ACCESS and MS-SQL, that enable the users get into more sophisticated item options, they can easily customize their purchase and view their Order Status real time and enjoy the Page & Data Caching functionality throughout improved Search functions.

More advanced ASP based software’s like Ace Flex as well .Net framework provide complete control to users enabling them to modify their shopping carts from any web browser from anywhere. However it is important that you need a developer who provide you complete customized and scalable solutions on affordable cost.  Also You should make sure that your applications are developed and set up on dedicated application servers preferably on dedicated server hosting account.

RSS offer the ability to syndicate content and help you indirectly somewhat in search engine optimization, it let travel your content and find subscribers who are interested to receive useful content through your website or a blog with regular update. RSS is good option than using any email services which is often considered spam. Doing RSS is not much difficult or too technical that few people worried about, it is an easy process that require few steps to syndicate content that is viable way to publish corporate information widely. Here are some of the important reasons for adopting RSS as a part of your communications strategy for your businesses.

Readers can opt-into feeds

It works like autoresponders and allows your prospects to opt-into the feeds they are interested in to get regular update through the RSS feeds reader. It is almost similar to building a list of subscribers!

2. No More spam complaints

Since using the subscription pages the thoughtful readers usually subscribe for your RSS feeds interested in reading the useful information through RSS reader, it is not going to consider as spam. Also before subscribing the users accept the Privacy Policy that means you are allowed to send them your syndication anytime without being noticed as spamming.

2. No Need to maintain an RSS feed

RSS release your burden to manage your subscriber list,  RSS is free to use and it doesn’t require that much effort as building a list like email.

3. Syndicate your content

RSS empower your ability to Syndicate your content - and e-mail your subscribers instantly letting them to be on familiar with your content right away.

4. Content Promotions and sales

RSS lets you broadcast your message fast and help you in promotions through your subscribers and the content travel very fast which enable you to promote your product or services on regular basis providing fresh content to your customers.

5. No More filter problems

While syndicating an article, You don’t  have to worry about your message being filtered anymore.  Every RSS feed passes through e-mail filters, all your messages are delivered accurately to your subscribers those you’re targeting.
So, don’t forget to syndicate your content..

By default there are not many editors on Linux which are CSS friendly, for better syntax highlighting and cleaner look, you basically need a text editor which perform smoothly in your web development environment. Here are some of great CSS editors available for Linux;

* Quanta+ - It provide maximal user extensibility, best editor for efficient and natural use, You can effectively manage editor contents and visually create dialogs for your scripts.

* CSSED - Best editor in open source for auto completion, syntax highlighting and syntax validation that make CSS editing easy. CSSED also features MDI notebook based interface, quick CSS properties and values insertion, auto-completion and dialog-based insertion of CSS complex values.

* Gedit - It is general purpose text editor,the official text editor for GNOME. A simple and efficient editor with flexible plugin system for CSS/HTML editing, and does syntax highlighting.

* SciTE - Another great editor for development, SCIntilla based Text Editor runs on both Linux & Windows. Apart from the standard syntax highlighting and code folding features - it also understands error messages from compilers/interpreters.

* jEdit - jEdit is Written in Java works on Unix, Windows, Mac OS and others. Great editor for CSS and other languages.

* BlueFish - A powerful editor with many great features. Supports editing of PHP, Javascript, HTML, CSS and so many others.

* Screem - A tool for web development environment which increase productivity, it provide quick access to commonly used features and provide versatile XML editing package, perfect for use as a general purpose structured data editing environment.

* Kate - Another web development editor on KDE with Sessions handling applications, it Supports most languages.

* Nvu - A complete Web Authoring System for Linux desktop users as well as Microsoft Windows and Macintosh users, you can handle it even without technical expertise or knowledge of HTML.

* Cream / Vim - Cream is a version of Vim which is easy-to-use configuration run on vim, It nicely highlights CSS syntax, HTML. It also provides a simpler learning step to vim.

To be Continued in next Post..

Here are the list of few popular content management system with brief note about their features; It guide you to decide which system best suits your needs.

Joomla! is an open source content management system for publishing content, it is most suitable for creating both business & personal websites. it include feature such as page caching to improve performance, RSS feeds, printable versions of pages, news flashes, blogs, polls, website searching, and language internationalization. By using Joomla CMS you can add many components which will enhance the value of your website and will enrich your visitors’ experience.

E107: With e107 released under the GNU General Public Licence, e107 is powered by PHP and mySQL that gives you a totally dynamic and professional website, the webmaster can create easy and quick business (intranet) or community driven website there is also a powerful forums system as a built-in application and a high performance file-based caching. Best CMS for Corporate website.

TYPO3: TYPO3 is suitable for enterprise and corporate level websites and also it can be used for intranets. It provides you ready made modules and interface which are flexible basic Typo3 installation. The design of TYPO3 is template-based and the webmaster can create own templates using their language TypoScript.

Mambo: Mambo is among most dynamic portal engine and content management system and commonly used Content Management Systems ever. With its help you can create simple as well the complex corporate website. It has many nice features and functionalities, it has easy to manage control panel and is user-friendly. Mambo has a growing community, support and template resources.

Drupal: With Drupal you can easily build different types of web pages, it is to setup or build a content driven or a community using drupal- you can create a simple web blogs to large online communities. Drupal’s designs are easy to create and it is very easy to customize/ it has built-in search tool and search-engine friendly and an extra module, discussion capabilities and news aggregator.

phpNuke: phpNuke is powerful Open Source portal application by which you can create web-based administration, surveys, customizable blocks, modules and themes with multilanguage support. The webmaster can add a lot of new features and customize the appearance of the website. It is widely used for game clan and guild sites.

Most of these content management systems have community forum which help you to get more information about this CMS from users, developers & web designers. Also check individual website for more information about all new features and latest development.