DNS is an Internet service that translates domain names into IP addresses. Because domain names are alphabetical they are easier to remember. The internet however, is really based on IP-addresses. Everytime you use a domain name, therefore, a DNS service must translate the name into the corresponding IP-address.For example: The domain name www.example.com translates to 192.168.0.10

The DNS system infact is its own network. If one DNS server doesn’t know how to translate a particular domain name, it asks another one and so on, until the correct Ip-address is returned.

What is the Internet?
The Internet is a world wide network of computers that are connected (networked) and are using a communication method called TCP/IP. What is the world wide web?
Also called web or www, it is a collection of information, resources, pictures, sounds and multimedia which is on the internet and are connected together. Products such as Netscape make accessing and linking to web pages containing information easy.What is a domain name?
A domain name is a description or representation of a computer’s location on the Internet. It is usually separated by a dot.

What is DNS?
DNS (Domain Name System) is a large database of domain names and their correspondent Internet (IP Addresses) for example: www.eukhost.com corresponds to it’s unique number 69.20.54.201

What is a DNS server?
A DNS server is any software on a computer that translates the domain names to their correspondent Internet unique number (IP address).

What is an IP address?
An IP (Internet Protocol) address is an unique number used to identify a computer on the Internet. If you are connected to the Internet, you must have a unique network number, which is an IP address.

What is a host?
A computer that is used to transfer data on the Internet.

What is web hosting?
To store and make web pages available and ready for inquiries, or a computer that has a consistant connection to the Internet.

What is Hypertext?
Hypertext is text on a webpage that links to another document or webpage. The hypertext link can be as small as a letter or a word, or as big as all the text on the page.

What is a URL?
Uniform Resource Locator is a web address used to connect to a remote resource on the world wide web.

What is Port?
In relationship to the Internet, a Port is a channel that a server software would listen to for any inquiries, there are certain standard default channels set for certain server software. For example, a web server software by default will listen to port 80 for any inquiry. Web server software can also listen to any other port, for example: http://www.eukhost.com:5000

What is InterNic?
InterNic is the agency that governs and maintains the name and host registration on the Internet.

A ‘t’ or ‘T’ as the last character of the “ls -l” mode characters
indicates that the “sticky” (save text image) bit is set. If the mode bit sticky bit is set on a directory, files
inside the directory may be renamed or removed only by the owner of
the file, the owner of the directory, or the superuser (even if the
modes of the directory would otherwise allow such an operation).[Example]
drwxrwxrwt 6 root root 4009984 Aug 4 14:19 tmp/
The syntax for setting the sticky bit on a dir /new directory is as follows:

chmod +t /new
The owner of a directory can set its sticky bit. The only people who can rename or remove any file in that directory are the file’s owner, the directory’s owner, and the superuser.

Here’s an example: the user max makes a world-writable directory and sets the sticky bit (shown as t here):

max# mkdir new
max# chmod 1777 new
max# ls -ld new
drwxrwxrwt 2 max kcmb 32 Nov 19 10:31 new

Other people create files in it. When jen tries to remove a file that belongs to era, she can’t:

jen# ls -l
total 2
-rw-r–r– 1 era kcmb 120 Nov 19 11:32 data.era
-rw-r–r– 1 jen kcmb 3421 Nov 19 15:34 data.jen
-rw-r–r– 1 peter kcmb 728 Nov 20 12:29 data.peter
jen# rm data.era
data.era: 644 mode ? y
rm: data.era not removed.
Permission denied

Eaccelerator is a PHP accelerator/encoder/caching utility that is based
off of the old mmcache (which is no longer being maintained). What Eaccelerator does is: it caches your PHP scripts so that the database
is no longer being queried every time someone needs a script. This is
particularly useful for large forums, but pretty much anyone can benefit
from it. Since these scripts are cached, you’ll notice a decrease in
memory use and server load.Now, onto installing this!
______________________________

Installing Eaccelerator

1. First, you’ll want to SSH into your server as the root user. you should
be in the default directory now. If you’re not, type in cd ~

Now we’ll make the eaccelerator directory:

mkdir /ea/

cd /ea/

2. Now we’ll grab the files, and untar them:
Notice that it’s a tar.bz2 file, so we need to decompress it twice.

wget http://heanet.dl.sourceforge.net/sourceforge/eaccelerator/eaccelerator-0.9.4-rc1.tar.bz2

bzip2 -d eaccelerator-0.9.4-rc1.tar.bz2

tar xvf eaccelerator-0.9.4-rc1.tar

3. Now that we’ve done that, let’s install Eaccelerator:
Note: in the following “export” command, you need to point that to where
PHP is installed. For most, it’s usually either “usr/” or “usr/local”, but
it may be something else.

cd eaccelerator-0.9.4-rc1/

export PHP_PREFIX=”/usr”

$PHP_PREFIX/bin/phpize

./configure –enable-eaccelerator=shared
–with-php-config=$PHP_PREFIX/bin/php-config

make

make install

4. It’s basically installed, now we need to edit the php.ini files to
include Eaccelerator. This is usually found in the /etc/ folder, but if
you can’t find it, run a “locate php.ini” (without quotes) to find it.
You can use pico or vi, it’s your choice:

cd ~

nano /etc/php.ini

—————————————————————————-
For a PHP extension install (most will probably want this)
—————————————————————————-

extension=”eaccelerator.so”
eaccelerator.shm_size=”16″
eaccelerator.cache_dir=”/tmp/eaccelerator”
eaccelerator.enable=”1″
eaccelerator.optimizer=”1″
eaccelerator.check_mtime=”1″
eaccelerator.debug=”0″
eaccelerator.filter=””
eaccelerator.shm_max=”0″
eaccelerator.shm_ttl=”0″
eaccelerator.shm_prune_period=”0″
eaccelerator.shm_only=”0″
eaccelerator.compress=”1″
eaccelerator.compress_level=”9″

—————————————————————————-
For a Zend Extension install (only if you have Zend Optimizer installed, or
if you’re going to install it
—————————————————————————-

zend_extension=”/usr/lib/php4/eaccelerator.so”
eaccelerator.shm_size=”16″
eaccelerator.cache_dir=”/tmp/eaccelerator”
eaccelerator.enable=”1″
eaccelerator.optimizer=”1″
eaccelerator.check_mtime=”1″
eaccelerator.debug=”0″
eaccelerator.filter=””
eaccelerator.shm_max=”0″
eaccelerator.shm_ttl=”0″
eaccelerator.shm_prune_period=”0″
eaccelerator.shm_only=”0″
eaccelerator.compress=”1″
eaccelerator.compress_level=”9″

cd ~

mkdir /tmp/eaccelerator/

chmod 0777 /tmp/eaccelerator/

5.After installed restart apache to check eaccelerator is installed.
service httpd restart

Open up your favorite FTP client and upload the eaccelerator.php and
eaccelerator_password.php files to any directory on your website.

Once that’s done, you can go to http://www.your-domain.com/path_to_s…ccelerator.php (of course,
replacing that with the path to the script) to see if it’s installed.

Now, we’ll probably want to add a password to prevent some mean user from
clearing the cached scripts or causing other bad stuff to happen. Navigate
to the eaccelerator_password file and set an administrator name and
password.

This doesn’t set the password, but it gives you a line of code to place in
your php.ini file (just below the eaccelerator part). Once you do this,
you need to log in to view the eaccelerator page.

cp /ea/eaccelerator-0.9.4-rc1/eaccelerator.php /usr/local/apache/htdocs/