[root@localhost usr]# rpm -qa |grep mysql*  --检查安装了什么包
mysql-5.0.77-4.el5_6.6 
libdbi-dbd-mysql-0.8.1a-1.2.2
[root@localhost usr]# yum install mysql-server  --yum 安装
Loaded plugins: katello, product-id, security, subscription-manager
Updating certificate-based repositories.
Unable to read consumer identity
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package mysql-server.i386 0:5.0.77-4.el5_6.6 set to be updated
--> Processing Dependency: perl-DBD-MySQL for package: mysql-server
--> Running transaction check
---> Package perl-DBD-MySQL.i386 0:3.0007-2.el5 set to be updated
--> Finished Dependency Resolution


Dependencies Resolved


===============================================================================================================================================================================================
 Package                                         Arch                                  Version                                           Repository                                       Size
===============================================================================================================================================================================================
Installing:
 mysql-server                                    i386                                  5.0.77-4.el5_6.6                                  rhel-debuginfo                                  9.8 M
Installing for dependencies:
 perl-DBD-MySQL                                  i386                                  3.0007-2.el5                                      rhel-debuginfo                                  147 k


Transaction Summary
===============================================================================================================================================================================================
Install       2 Package(s)
Upgrade       0 Package(s)


Total download size: 9.9 M
Is this ok [y/N]: y
Downloading Packages:
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total                                                                                                                                                          2.1 GB/s | 9.9 MB     00:00     
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing     : perl-DBD-MySQL                                                                                                                                                          1/2 
  Installing     : mysql-server                                                                                                                                                            2/2 
Installed products updated.


Installed:
  mysql-server.i386 0:5.0.77-4.el5_6.6                                                                                                                                                         


Dependency Installed:
  perl-DBD-MySQL.i386 0:3.0007-2.el5                                                                                                                                                           


Complete!
[root@localhost usr]# service mysqld start  --启动服务
Initializing MySQL database:  Installing MySQL system tables...
150322  7:42:29 [Warning] option 'max_join_size': unsigned value 18446744073709551615 adjusted to 4294967295
150322  7:42:29 [Warning] option 'max_join_size': unsigned value 18446744073709551615 adjusted to 4294967295
OK
Filling help tables...
150322  7:42:29 [Warning] option 'max_join_size': unsigned value 18446744073709551615 adjusted to 4294967295
150322  7:42:29 [Warning] option 'max_join_size': unsigned value 18446744073709551615 adjusted to 4294967295
OK


To start mysqld at boot time you have to copy
support-files/mysql.server to the right place for your system


PLEASE REMEMBER TO SET A PASSWORD FOR THE MySQL root USER !
To do so, start the server, then issue the following commands:
/usr/bin/mysqladmin -u root password 'new-password'
/usr/bin/mysqladmin -u root -h localhost.localdomain password 'new-password'


Alternatively you can run:
/usr/bin/mysql_secure_installation


which will also give you the option of removing the test
databases and anonymous user created by default.  This is
strongly recommended for production servers.


See the manual for more instructions.


You can start the MySQL daemon with:
cd /usr ; /usr/bin/mysqld_safe &


You can test the MySQL daemon with mysql-test-run.pl
cd mysql-test ; perl mysql-test-run.pl


Please report any problems with the /usr/bin/mysqlbug script!


The latest information about MySQL is available on the web at
http://www.mysql.com
Support MySQL by buying support/licenses at http://shop.mysql.com
                                                           [  OK  ]
Starting MySQL:                                            [  OK  ]

[root@localhost usr]# mysql
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.0.77 Source distribution


Type 'help;' or '\h' for help. Type '\c' to clear the buffer.


mysql> select user();
+----------------+
| user()         |
+----------------+
| root@localhost | 
+----------------+
1 row in set (0.00 sec)


mysql> 

[root@localhost etc]# cat /etc/my.cnf 
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# Default to using old password format for compatibility with mysql 3.x
# clients (those using the mysqlclient10 compatibility package).
old_passwords=1


# Disabling symbolic-links is recommended to prevent assorted security risks;
# to do so, uncomment this line:
# symbolic-links=0


[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
[root@localhost etc]#