Tech@Sakana – A sysadmin’s blog

This Perl one-liner is intended to print the 10 most frequent client IP addresses in an Apache log file. It can easily be recycled to count anything, though.
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When working as a systems administrator, you’ll always end up having to solve a file system full error in a hurry. Here are a few commands and hints to help you get out of it quickly on a UNIX like system.
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If there’s a file installed on your disk for which you’d like to know what package provided it, you can use the equery command like below :
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You need to have read/write permissions to /dev/dri/cardX to benefit from 3D hardware acceleration in Xorg X Server. On a Gentoo linux machine, this file has the following permissions set by default :

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ls -l /dev/dri/card0 
crw-rw---- 1 root video 226, 0 2009-10-14 16:12 /dev/dri/card0

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If you use Gentoo and tried to install Cacti with Lighttpd instead of Apache, chances are that you ran into this error message :

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/usr/lib/python2.6/site-packages/WebappConfig/content.py:27: DeprecationWarning: the md5 module is deprecated; use hashlib instead
  import md5, re, os, os.path
* Fatal error: Your configuration file sets the server type "Apache"
* Fatal error: but the corresponding package does not seem to be installed!
* Fatal error: Please "emerge >=www-servers/apache-1.3" or correct your settings.
* Fatal error(s) - aborting

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