Currently viewing the category: "linux"

VirtualBox – SSH’ing into a VM from an outside machine

By On October 24, 2009 · Leave a Comment

Note: The terminology used below also applies to VMWare. The screens are different, but the issue and the solution are the same.

When creating a new VM through VirtualBox, you might have a problem SSH’ing into the box. You also might notice you get a 10.0.x.xx type address, even though the rest of your network [...]

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Why is Social Q&A Not Embedded into Operating Systems and Applications?

By On May 3, 2009 · 1 Comment

One thing that always bothered me about complex desktop applications like Adobe Photoshop or Eclipse, or even Desktop Linux is finding out how to use the more advanced features (or, truthfully, some of the basic features). I’ve always liked community response, so I’ve been on a number of mailing lists and it’s [...]

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Interesting Programmer Links

By On April 21, 2009 · Leave a Comment

Peeping into memcached.

Really interesting read about how to examine what’s stored in memcached.

Peep uses ptrace to freeze a running memcached server, dump the internal key metadata, and return the server to a running state. If you have a good host ejection mechanism in your client, such as in the Twitter libmemcached [...]

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Linux: use lsof to find which files are open by a process

By On December 23, 2008 · 2 Comments

lsof works under linux and MacOS X and will help you figure out what files are open.

lsof | grep ‘mysqld’

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Compiling libjpeg on 64 bit Centos

By On July 7, 2008 · Leave a Comment

I ran into an issue just now compiling libjpeg on 64 bit CentOS. I found this very helpful post that gives a workaround using a config.guess file from libtool. For some reason, I didn’t have the folder he suggested, but I did have the alternative (automake).

cp /usr/share/automake-1.9/config.guess .
cp /usr/share/automake-1.9/config.sub .

[...]

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How many lines of code?

By On May 5, 2008 · 1 Comment

I was curious how many lines of code were in PHPBB 3. I only wanted to know about the .php files.

find . -name ‘*.php’ -exec wc -l {} \; | awk ‘{ SUM += $1 } END {print SUM}’

The downside to this is that it includes whitespace and braces as lines, [...]

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Problems Installing Subversion From Source On CentOS

By On March 26, 2008 · 5 Comments

I was setting up a new server for someone, and encountered this error while I was trying to build svn

/usr/bin/ld: cannot find -lexpat

Now, while I can do some things on that a sys admin can, I am by no means a sys admin. I have only installed svn a handful of times, and [...]

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PHP: Setting Up XDebug with KCacheGrind

By On July 26, 2007 · 7 Comments

KCacheGrind is a very useful tool to identify bottlenecks in your applications. This will explain the steps to using it to find issues with your PHP scripts. For me, the scripts are all web pages.

I’m already assuming you’re running a current version of PHP. I did this using PHP 5.2.1. These instructions are based [...]

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Apache Compile Error

By On July 24, 2007 · Leave a Comment

I got this while recompiling apache (2.2.4).

configure: error: Cannot use an external APR-util with the bundled APR

After searching around for a while, I found a tip here to include this in my configure:

–with-included-apr

Built on MacOS X 10.4.

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PHP compile error on CentOS Install

By On July 15, 2007 · 6 Comments

I installed CentOS 5 on my VMWare a few days ago. I installed gcc via yum, compiled and installed libxml2. I then tried to install PHP 5.2.3 and received this error:

configure: error: installation or configuration problem: C++ compiler cannot create executables.

It took me forever to figure this out, but I had to install [...]

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