This blog explains the steps to install Knowledge Tree on a Cent OS server.

We were asked to install a Knowledge Management System called Knowledge Tree for one of our shared hosting clients, whose website is hosted in Centos 5.5 server.
Once we got this requirement I went through knowledgetree web site and I found that they do not provide the documentation for the installation in Centos server but they support RedHat Linux 5 and it is clearly explained in their Platform Requirements page.  So I decided to try it out on my own and once got it installed successfully, am sharing the steps with you.

I downloaded the community edition from their Knowledge Tree Community downloads page using the install from source code option.

Here is the installation steps I did

1. After downloading, untar the compressed file and open the folder through browser (i.e., http://yoursite.com/knowledgetree/) which goes through a series of steps for installation. These steps are very straight forward like checking installation requirements, database username and password etc..,

2. Once I completed the installation without any errors, I got the following error when I opened the installed knowledgetree site using a web browser
i.e., http://yoursitename.com/knowledgetree/

Fatal error: Cannot use object of type DB_Error as array in /var/www/knowledgeTree/lib/session/Session.inc on line 252

This error is because that there is no contents in the database which should have been created by the Knowledge Tree installation process during installation. I don’t know why this was not done automatically when we installed even though we provide database username and password.

In any case, I went to the  knowledgetree/sql/mysql/install/ folder and found the data.sql and structure.sql files. I downloaded both the files and imported structure.sql and then data.sql

3. Now, when I checked the site http://yoursite.com/knowledgetree/

I got a new error

Fatal error: Call to a member function getPath() on a non-object in /var/www/knowledgeTree/lib/plugins/pluginutil.inc.php on line 597

This error can be fixed by truncating the two tables in database. I truncated them using phpmyadmin and opened the database and ran the following two SQL statements.

truncate plugins;
truncate plugin_helper;

4. Now, I got the following error when I accessed the site http://yoursite.com/knowledgetree/

[db_error: message="DB Error: connect failed" code=-24 mode=return level=notice prefix="" info="Array"]

I fixed it by verifying the database credentials in /var/www/knowledgeTree/config/config.ini

dbHost = localhost
dbName = database name
dbUser = database username
dbPass = database password
dbPort = 3306

dbAdminUser = database username
dbAdminPass = database password

Please remember to change “dbAdminUser” and “dbAdminPass” which I forgot earlier.

Thus completed by installation after my tough fight with it, but at the end it worth it as it took care of the client’s need.

Hope someone will find this information useful if you are looking to install Knowledge Tree on Cent OS.

This site is gaining a lot of public attention, not only for its high profile founder, but also for the fact that it satisfies a need in the market today.

Squareup allows payments to be accepted from mobile devices and a device like iPhone can become the credit card processing machine with the addition of a small hardware to it. Receipts are instantly sent to email id or even can be printed from Squareup website.

This is now creating a new opportunity for everyone to use a payment mechanism that virtually did not exist before. Because of this reason, we are closely following Squareup and are waiting for its public launch. (Currently the site is only open to a few invited merchants who are using it in California.)

Stay tuned for more updates on this.

I have used whois.sc for over five years now and they provide the information in one click for almost all the third level domains available in the world. The simplicity and easy of use is what has attracted me to the site as it gives exactly what I am looking for, with minimum interaction.

This site was later changed to domaintools.com and that happened over two years ago. Until today, the only link I remember is whois.sc and have never been able to memorize domaintools.com. I am sure they are aware of this, because they even have their redirects going to whois.domaintools.com. Inspite of this, even today, when I have to do a whois lookup, i simply type whois.sc  – I heard the same feedback from other people who use whois.sc.

This fact also teaches a good point: People get used to specific names and specific patterns of doing a task – after their brain is tuned to doing the task that way, it is very difficult to make them change it. This is an important point that I want to discuss with our team also, as we work on many client websites and user interaction is a primary element in all these sites.

Please do share your thoughts on the same.

Tech Crunch is quite useful to learn about the recent innovations, developments, mergers, fundings, etc. It was founded by an individual called Michael Arrington, who is quite popular in online world.

Though Tech Crunch started as a technology blog, they have now diversified into many different verticals and have a sub section for Mobile Gadgets related news, one section for latest gadgets (they are also trying their own version of tablet pc for the internet), database of investors, startups, etc.

For any non-technical news about the latest happenings in the startup world online, Tech Crunch is highly recommended.

Tech Crunch Website Link is available here

We recommend Web Hosting Talk website to any one with interests or inclination towards learning the latest aspects in web hosting industry. We hang out on web hosting talk quite often as it provides the latest scoop on all the things that happen in this industry.

Various aspects of web hosting are discussed on this site such as shared hosting, VPS, dedicated hosting, etc. I have seen experts in each area such as Payment Gateways, SSLs, eCommerce, Bandwidth providers, etc share their thoughts on relevant fields.

The nature of the audience to this site is small and medium web hosts with a huge number of new entrants coming into web hosting industry, hanging out there quite often. The exponential growth of web hosting industry around the world is primarily due to the proportionate growth in internet broadband usage and spread around the world, thus resulting in more and more businesses trying to establish a online presence. The industry is considered to grow to a multi-billion dollar one in the near future and that is one reason why big players like Amazon, Microsoft, etc are trying to get their hand on this pie using the cloud computing model, which is a logical extension of today’s web hosting models.

We have also spent some time on Web Hosting Talk in the past and believe that it is one of the ideal forum models for any business trying to build a forum based community online.

Do check it out and share your views here.

High Scalability is one website we would like to recommend to all our readers as this website focuses on providing specific details about how top websites in the world handled their scalability related requirements.

Some of the top rated articles on High Scalability website are the ones about You Tube, PlentyOfFish, Google, Flickr, Amazon and Twitter.

If you have visited this site earlier, let us know what you think about it. If you have not visited it before, please do add it to your daily reading list as it will help you in your understanding of any high performance website.