Php2s | Linux, Security, Open Source for Newbies and Geeks

Arch Linux Compared to Other Distributions

September 8th, 2010

Frank Boros

archlinux Arch Linux Compared to Other Distributions This page attempts to draw a comparison between Arch Linux and other popular GNU/Linux distributions and UNIX-like operating systems. The summaries that follow are brief descriptions that may help a person decide if Arch Linux will suit their needs. Although reviews and descriptions can be useful, first-hand experience is invariably the best way to compare distributions.

Source-based

Source-based distros are highly portable, giving the advantage of controlling and compiling the entire OS and applications for a particular machine architecture and usage scheme, with the disadvantage of the time-consuming nature of source compilation. The Arch base and all packages are compiled for i686 and x86-64 architectures, offering a potential performance boost over i386/i486/i586 binary distros, with the added advantage of expedient installation.
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VMware ESX, EMC CLARiiON Arrays, and Multiple Protocols

September 8th, 2010

Frank Boros

vmware view pilot VMware ESX, EMC CLARiiON Arrays, and Multiple Protocols VMware ESX, EMC CLARiiON Arrays, and Multiple Protocols by Scott Lowe
I was browsing through an EMC technical document titled “EMC CLARiiON Integration with VMware ESX Server” (download it here) a little while ago and I came across a phrase in the document that caught my attention:

“VMware ESX/ESXi support both Fibre Channel and iSCSI storage. However, VMware and EMC do not support connecting VMware ESX/ESXi servers to CLARiiON Fibre Channel and iSCSI devices on the same array simultaneously.”

What? No Fibre Channel and iSCSI from the same array to a VMware ESX/ESXi host simultaneously? That piqued my curiosity, so I contacted a few people within EMC to question the veracity of that statement. It turns out that the answer is more complicated than it might seem at first glance.
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CCNA Complete Guide 2nd Edition by Yap Chin Hoong

September 8th, 2010

Sheikh Khalid

CCNA Complete Guide 2nd Edition covers the syllabus of the latest CCNA 640-802 Exam. Written with the mindset to become the best CCNA self-study guide ever, it contains all the theory and practical knowledge that an accomplished CCNA must obtain to ace both the CCNA exam and the challenging real-life working environments.
If you have just begun your CCNA journey, CCNA Complete Guide 2nd Edition will save you hours of research and trial-and-error learning. If you are well into your CCNA preparation, CCNA Complete Guide 2nd Edition will provide you with an excellent baseline on how well you are progressing, and fill all the gaps in your knowledge holes.

CCNA Complete Guide 2nd Edition includes all the lab setups built using the Dynamips, the Cisco router emulation software. Practical knowledge is vital for a CCNA candidate and you can horn this invaluable skill by launching the pseudo-real-devices in seconds and proceed to the lab guides.
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How to Installation and Configuration BIND DNS Server on CentOS 5.3

September 8th, 2010

Frank Boros

How to Installation and Configuration BIND DNS Server on CentOS 5.3
BIND, stands for Berkeley Internet Name Domain, is the most commonly used Domain Name System (DNS) server (or simply name server) on the Internet. On UNIX-Like systems it is the de facto standard. BIND was originally created by four graduate students at the Computer Systems Research Group (CSRG) at University of California, Berkeley, and was first released with 4.3BSD. Paul Vixie started maintaining it in 1988 while working for DEC. Today, BIND is maintained by the ISC (Internet Systems Consortium). BIND is by far the most widely used DNS server software on the Internet. It provides a robust and stable platform on top of which organizations can build distributed computing systems with the knowledge that those systems are fully compliant with published DNS standards.

Getting Started:
In this tutorial I will demonstrate how to setup BIND DNS Server on CentOS 5.3. Use your favorite editor to edit configuration files. I use nano.
We start off by installing required packages. Following is the list of packages associated with DNS:
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How to configure network card in Red Hat Enterprise Linux, CentOS, Fedora Core from CLI

September 2nd, 2010

Frank Boros

How to configure network card in Red Hat Enterprise Linux, CentOS, Fedora Core from CLI
Red hat Linux provides following tools to make changes to Network configuration such as add new card, assign IP address, change DNS server etc.

[a] GUI tool (X Windows required) – system-config-network
[b] Command line text based GUI tool (No X Windows required) – system-config-network
[c] Edit configuration files stored in /etc/sysconfig/network-scripts/ directory.

Following instructions are compatible with
(1) CentOS Linux
(2) Fedora Core Linux
(3) Red Hat Enterprise Linux (RHEL) 3/4/5

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WP-Optimize Database Cleanup and Optimization Plugin for WordPress

July 29th, 2010

Frank Boros

wp optimize WP Optimize Database Cleanup and Optimization Plugin for Wordpress I use wordpress solutions in a day to day basis. WordPress comes with a very extensible framework that allows you to add comprehensive and powerful functionality to your Blog system. WP-Optimize plugin is written to simplify your daily wordpress works and make it simpler. WP-Optimize is a wordpress 2.7++ database cleanup and optimization tool. It doesn’t require PhpMyAdmin to optimize your database tables. It allows you to remove post revisions, comments in the spam queue, un-approved comments within few clicks. Additionally you can rename any username to another username too. Here are the details.
Hosted at WordPress Official Plugin Directory
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How to disable scripts and styles

July 29th, 2010

Frank Boros

Many plugins and themes add JavaScript and CSS files to your site. While this alone isn’t necessarily a bad thing, using several plugins that do this can bog down your site with loads of requests for these files.

The good news is that WordPress has a built-in system that allows us to deregister these scripts and styles.

Wait, don’t the plugins require this code? Probably. But, we want to take control of these files and make our sites run faster. Disabling these scripts and styles will allow us to do a few things:
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How to Resolve Fatal Error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 30720 bytes)

May 28th, 2010

Frank Boros

Recently, when either adding new plugins or upgrading plugins in WordPress, I encountered this error message:

Fatal Error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 30720 bytes)…

This means that WordPress needs more memory to run a process than the default PHP setting (usually 12M, in some, 32M). For a non-techie guy like me, the error is frustrating, and very alarming.

Before you panic, there are actually simple solutions to this problem that even a non-techie person can do. The first solution is the “standard” or proper way to resolve it, however, it depends whether you have access to the file that needs to be updated. The second one is much easier, a “hack” to a specific WordPress file, however, you may need to do it again everytime you perform a WordPress upgrade.
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