Nous allons installer un serveur MySQL pour l'utiliser avec d'autres applications : serveur de messagerie, système de supervision, ...

# yum install mysql-server mysql-devel

Suivant la capacité mémoire de votre serveur linux, vous pouvez configurer plus finement votre serveur MySQL. Il existe dans le répertoire [/usr/share/doc/mysql-server-5.1.61/] des fichiers de configuration qui tiennent compte de la taille de la mémoire. Nous allons utiliser l'un de ces fichiers.

Sauvegardez l'ancien fichier [/etc/my.cnf].

# mkdir -p /root/backup/mysql     <= Création d'un répertoire de sauvegarde
# cp /etc/my.cnf /root/backup/mysql/my.cnf.old     <= Sauvegarde du fichier

Copiez le fichier [/usr/share/doc/mysql-server-5.1.61/my-medium.cnf] dans le répertoire [/etc].

# cp /usr/share/doc/mysql-server-5.1.61/my-medium.cnf /etc/my.cnf

Le fichier à modifier => [/etc/my.cnf]. Editez-le en tenant compte du listing ci-dessous.

# vim /etc/my.cnf
  # Example MySQL config file for medium systems.
  #
  # This is for a system with little memory (32M - 64M) where MySQL plays
  # an important part, or systems up to 128M where MySQL is used together with
  # other programs (such as a web server)
  #
  # MySQL programs look for option files in a set of
  # locations which depend on the deployment platform.
  # You can copy this option file to one of those
  # locations. For information about these locations, see:
  # http://dev.mysql.com/doc/mysql/en/option-files.html
  #
  # In this file, you can use all long options that a program supports.
  # If you want to know which options a program supports, run the program
  # with the "--help" option.

  [client]
    port = 3306
    socket = /var/lib/mysql/mysql.sock

  [mysqld]
    datadir = /var/lib/mysql
    user =  mysql
    language = /usr/share/mysql/french
    port = 3306
    socket = /var/lib/mysql/mysql.sock
    skip-external-locking
    key-buffer = 16M
    max_allowed_packet = 16M
    table_cache = 64
    sort_buffer_size = 512K
    net_buffer_length = 8K
    read_buffer_size = 256K
    read_rnd_buffer_size = 512K
    myisam_sort_buffer_size = 8M
    # log-bin = mysql-bin
    # binlog_format=mixed
    server-id = 1

  [mysqldump]
    quick
    max_allowed_packet = 16M

  [mysql]
    no-auto-rehash

  [myisamchk]
    key_buffer_size = 20M
    sort_buffer_size = 20M
    read_buffer = 2M
    write_buffer = 2M

  [mysqlhotcopy]
    interactive-timeout

  [mysqld_safe]
    log-error = /var/log/mysqld.log
    pid-file = /var/run/mysqld/mysqld.pid

Démarrez le serveur MySQL.

# service mysqld start

Attribuez un code d'accès au compte administrateur de MySQL "root".

# mysqladmin -u root password 'password'

Connectez-vous à la base de données "mysql" avec le compte "root".

# mysql -u root -p
  Enter password:      <= Tapez votre mot de passe
  Welcome to the MySQL monitor. Commands end with ; or \g.
  Your MySQL connection id is 3
  Server version: 5.1.61-log Source distribution

  Copyright (c) 2000,2011, Oracle and/or its affiliates. All rights reserved.

  Oracle is a registered trademark of Oracle Corporation and/or its
  affiliates. Other names may be trademarks of their respective
  owners.

  Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

  mysql>

Supprimez la base de données "test".

mysql> drop database test;
       Query OK, 0 row affected (0.01 sec)

Activez la base de données "mysql".

mysql> connect mysql;
       Connection id:    4
       Current database: mysql

Affichez les utilisateurs créés par MySQL.

mysql> select user,host,password from user;
       +------+-----------+-------------------------------------------+
       ¦ user ¦ host      ¦ password                                  ¦
       +------+-----------+-------------------------------------------+
       ¦ root ¦ localhost ¦ *2470C0C06DEE42FD1618BB99005ADCA2EC9D1E19 ¦
       ¦ root ¦ esx10     ¦                                           ¦
       ¦ root ¦ 127.0.0.1 ¦                                           ¦
       ¦      ¦ localhost ¦                                           ¦
       ¦      ¦ esx10     ¦                                           ¦
       +------+-----------+-------------------------------------------+
       5 rows in set (0.00 sec)

Attribuez un code d'accès pour les comptes 'root'@'esx10' et 'root'@'127.0.0.1'.

mysql> set password for 'root'@'esx10'=PASSWORD('password');
       Query OK, 0 row affected (0.01 sec)
mysql> set password for 'root'@'127.0.0.1'=PASSWORD('password');
       Query OK, 0 row affected (0.01 sec)

Supprimez les enregistrements ne disposant pas de code d'accès.

mysql> delete from user where password="";
       Query OK, 2 row affected (0.00 sec)

Quittez MySQL.

mysql> flush privileges;
       Query OK, 0 row affected (0.00 sec)
mysql> exit
       Bye

Activez le service "mysqld" au démarrage du système.

# chkconfig mysqld on

Le serveur MySQL est opérationnel !