The port numbers are divided into three ranges: the Well Known Ports,
the Registered Ports, and the Dynamic and/or Private Ports.

The Well Known Ports are those from 0 through 1023.

The Registered Ports are those from 1024 through 49151

The Dynamic and/or Private Ports are those from 49152 through 65535

Mod_Rewrite Tips and Tricks are lot of .htaccess rewrite examples that show specific uses for creating .htaccess rewrites to do all kinds of cool and profitable stuff for your site. Htaccess Rewrites are enabled by using the Apache module mod_rewrite, which is one of the most powerful Apache modules and features availale. Htaccess Rewrites through mod_rewrite provide the special ability to Rewrite requests internally as well as Redirect request externally...

Get status of apache (80) and lighttpd (81) on different ports:

This is done at the nodes.

1. Enable apache server-status in httpd.conf :
   
   <Location /server-status> 
    SetHandler server-status
    Order deny,allow
    Deny from all
    Allow from 127.0.0.1
</Location>
2. Enable lighttpd server-status in lighttpd.conf :
   
   $HTTP["remoteip"] == "127.0.0.1" {
status.status-url          = "/server-status"
}
3. Create /etc/munin/plugin-conf.d/apache:
   
   [apache*]
env ports="80 81" 

   * Test with:
   

   ports="80 83" /etc/munin/plugins/apache_processes

lighttpd idle process will be a straight line as total of busy and idle process is always the same when drawn as STACK, . To change this to LINE1:

At the host, edit "/etc/munin/munin.conf" and add the below line to the corresponding host:

1. Edit conf file: /etc/lighttpd/lighttpd.conf
   
2. Enable mod_expire and mod_compress.
   
3. Expire static files set for 3 days:
   
   $HTTP["url"] =~ "\.(js|css|gif|jpg|png|ico|txt|swf|html|htm)$" { expire.url = ( "" => "access 3 days" ) }
4. Compress mime types:
   
   compress.cache-dir         = "/var/cache/lighttpd/compress/"
compress.filetype          = ("text/plain", "text/html", "text/css", "text/xml", "text/javascript")
5. Cleanup the compressed cache via daily cron script:
   
   #!/bin/bash
# lighttpd_cache_clean
# Clean cache stored at /var/cache/lighttpd/compress
# Place in /etc/cron.daily

# Cache dir path
CROOT="/var/cache/lighttpd/compress"

#Deleting files older than 3 days
HOURS=72

# Lighttpd user and group
LUSER="lighttpd"
LGROUP="lighttpd"

# start cleaning
/usr/sbin/tmpwatch --mtime ${HOURS} ${CROOT}

# if directory missing just recreate it
if [ ! -d $CROOT ]
then
        mkdir -p $CROOT
        chown ${LUSER}:${LGROUP} ${CROOT}
fi

exit 0
6. Create the cache directory and update permissions:
   
   mkdir -p /var/cache/lighttpd/compress
chown lighttpd:lighttpd /var/cache/lighttpd/compress
7. Restart lighttpd.

Kismet is a 802.11b wireless network sniffer. It is capable of sniffing using almost any supported wireless card using the Airo, HostAP, Wlan-NG, and Orinoco (with a kernel patch) drivers.Kismet identifies networks by passively collecting packets and detecting standard named networks, detecting (and given time, decloaking) hidden networks, and infering the presence of nonbeaconing networks via data traffic.

A general easy to follow guide to setting up RAID-5 and LVM on a modern Linux system.

Below command will convert and create a pdf of a manual page.

Linux command line reference for common operations...

Ksplice Uptrack is an update service for the Linux kernel; it automatically delivers security and reliability improvements to your machine, without the disruption of rebooting.

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VLC media player is a highly portable multimedia player for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, mp3, ogg, …) as well as DVDs, VCDs, and various streaming protocols.It can also be used as a server to stream in unicast or multicast in IPv4 or IPv6 on a high-bandwidth network.