Technology Errors

vBulletin: You Specified a Tag That Was Too Long. A Tag Can Only be 25 Characters

As many people know I am one of the administrators of the Backtrack-Linux forums. We generally do not have to many issues but today I had someone complaining that when posting code they were not able to use more than 25 characters. This is a issue since we encourage our users to use the tags for there posts since it makes adding code much neater and easier to read & copy/paste. Below I will describe how to fix the error.

Technology Errors

PHP Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 7680 bytes)

I recently reinstalled CentOS on a server for a client and then proceeded to install their WordPress web site on the fresh install of CentOS Linux. After working through various minor issues the WP site was up and functioning without issue but after a week or so they contacted me to let me know that they could no longer view items in their FAQ system via the WordPress administration site. The FAQ system is a WordPress plugin called FAQ Builder and is a great little system for frequently asked questions. Below I describe the error received when attempting to access the FAQ Builder admin and what I did to resolve the issue.

Technology Insights

Cacti Graph Templates Explained: RRDTool Graphing Solution

**Please Note This Article Is Paginated at the bottom and includes 4 pages**

How do I create Cacti Graph Templates? How do I display multiple data sources on one Cacti graph? What do all the Cacti options mean? What is a CDEF? I created a Cacti Graph but all of my data sources are displaying NAN, how do I troubleshoot that?

Cacti is a powerful RRDTool based graphing system typically used for graphing hardware and software data for historical reference. When I initially configured a Cacti Graph Template I found some of the options confusing but as you will see below they all make sense and typically the name explains each items function in a fairly easy way. Please post a comment if you have any further questions that are not answered or if I have made any answers feel free to use the contact form and point them out to me as I am trying to learn the best way to use Cacti just like everyone else. I repeat the same terms many times in this document simply for the fact to try and explain in detail what things mean. I did not want to start switching names with acronyms and vice verse to add confusion and to try and make this a very easy document to understand.