Non ho i permessi per commentare, quindi come risposta separata.
1) Controlla quale LINUX hai
rpm -q centos-release
lsb_release -a
uname -m
2) Controlla il rilascio della distribuzione rpm corretta per te
http://pkgs.repoforge.org/rpmforge-release/
3) Aggiungi quella distribuzione
wget http://packages.sw.be/rpmforge-release/rpmforge-release-0.3.6-1.el5.rf.i386.rpm
sudo rpm -Uvh rpmforge-release-0.3.6-1.el5.rf.i386.rpm
4) Installa l'applicazione
sudo yum install phpmyadmin
ln -s /usr/share/phpmyadmin/ /var/www/html/phpmyadmin
vim /usr/share/phpmyadmin/config.inc.php
5) Crea permessi a MySQL se necessario (sostituisci pmapass con la tua password!)
GRANT USAGE ON mysql.* TO 'pma'@'localhost' IDENTIFIED BY 'pmapass';
GRANT SELECT (
Host, User, Select_priv, Insert_priv, Update_priv, Delete_priv,
Create_priv, Drop_priv, Reload_priv, Shutdown_priv, Process_priv,
File_priv, Grant_priv, References_priv, Index_priv, Alter_priv,
Show_db_priv, Super_priv, Create_tmp_table_priv, Lock_tables_priv,
Execute_priv, Repl_slave_priv, Repl_client_priv
) ON mysql.user TO 'pma'@'localhost';
GRANT SELECT ON mysql.db TO 'pma'@'localhost';
GRANT SELECT ON mysql.host TO 'pma'@'localhost';
GRANT SELECT (Host, Db, User, Table_name, Table_priv, Column_priv)
ON mysql.tables_priv TO 'pma'@'localhost';