Wednesday, October 14, 2009

LAMP Server For CentOS/RHEL

This tutorial shows a quick way of installing a LAMP server (Linux + Apache + MySQL + PHP/Perl together commonly known as LAMP Server.) on CentOS and RHEL server systems.
  • Apache Web Server 2.x
  • MySQL Database Server 5.x
  • PHP Scripting Language 5.x
  • phpMyAdmin - Web based MySQL Administration Tool

Install Apache
     Apache is the most popular Web HTTP server for a Linux servers.
# yum install httpd httpd-devel
We might need the httpd-devel libraries to compile and install other modules from the sources, just to be on the safer side. /etc/httpd/conf/httpd.conf - Apache configuration file location.
# /etc/init.d/httpd start

Install MySQL Database Server     MySQL is a widely used open source database server on most Linux servers and can very well integrate to PHP and Apache server on CentOS/RHEL.
# yum install mysql mysql-server mysql-devel

If you attempt to type mysql in command prompt, you will be getting this nasty error.
ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’
This is because you are not running the mysqld daemon before launching the mysql client. The file /var/lib/mysql/mysql.sock will be automatically created upon running the first instance of mysql.
To fix:
First start the mysql daemon, then type mysql:
# /etc/init.d/mysqld start
# mysql

Changing MySQL Root Password     By default the root password is empty for the mysql database. It is a good idea to change the mysql root password to a new one from a security point of view.
mysql> USE mysql;
mysql> UPDATE user SET Password=PASSWORD('newpassword') WHERE user='root';

Once done, check by logging in:
mysql -u root -p
Enter Password:

To Create A New MySQL User
     To create a new mysql user 'guest' with 'all privileges' on the database 'demo':
mysql > create database demo
mysql >GRANT ALL PRIVILEGES ON demo.* TO 'guest'@'localhost' IDENTIFIED BY 'guest' WITH GRANT OPTION;
mysql> UPDATE user SET Password=PASSWORD('guest') WHERE user='guest';

That's it! MySQL is ready! Don't forget to remember the root password as we might be using it with phpmyadmin.

Install PHP5 Scripting Language
     Installing PHP5 with the necessary modules is so easy and can be configured for both the Apache and mysql environment.
# yum install php php-mysql php-common php-gd php-mbstring php-mcrypt php-devel php-xml
Don't forget to install php-gd (gd library). It is very important if we plan to run captcha scripts on our server and so as other which are dependent on mysql and other functions.
Restart Apache to load php.
# /etc/init.d/httpd restart

To Test If PHP Is Working Or Not:
Create a file named /var/www/html/test.php with the following phpinfo() function inside php quotes.
// test.php
Then point your browser to http://ip.address/test.php.
That's it! You should see a php configuration file displaying all kind of paths and installed modules.
Closely observe the installed configuration on your server.
  •   PHP Paths (php.ini path)
      Apache paths and Loaded Modules (mod_security, mod_evasive if installed_
      PHP GD Library
      MySQL paths and other information
Install phpMyAdmin
     phpMyAdmin is a free web based MySQL database Administration Tool. Without phpMyAdmin it is almost impossible to mysql db operations in the command line. phpMyAdmin has become so convenient and it is absolutely sought by most webmasters to be present along with the mysql server.
# yum install phpmyadmin
Point your browser to: http://ip.address/phpmyadmin.
Common Errors
    You might encounter the following errors while configuring phpmyadmin.
You don't have permission to access /phpmyadmin/ on this server.

To fix:
Edit the /etc/httpd/conf.d/phpmyadmin.conf and uncomment the line deny from all.
# nano /etc/httpd/conf.d/phpmyadmin.conf

  Order Deny,Allow
  # Deny from all
  Allow from

The configuration file now needs a secret passphrase (blowfish_secret)

To fix:
# nano /usr/share/phpmyadmin/
Look for a line and enter any password. Just dont leave it empty!
$cfg['blowfish_secret'] = 'mydpassword'; /* YOU MUST FILL IN THIS FOR COOKIE AUTH! */
It worked for me using the above methods!
Log into the phpmyadmin with the mysql root password we changed while installing the mysql database.

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