第一步：准备MySQL安装文件

MySQL-server-5.5.31-2.linux2.6.x86_64.rpm
MySQL-client-5.5.31-2.linux2.6.x86_64.rpm

第二步：检查是否安装过MySQL

rpm -qa | grep mariadb

第三步：卸载已经安装过的MySQL

rpm -e mariadb-libs-5.5.52-1.el7.x86_64 --nodeps

第四步：安装依赖

yum install -y perl-Module-Install.noarch

第五步：安装MySQL服务端

rpm -ivh MySQL-server-5.5.31-2.linux2.6.x86_64.rpm

[root@ningxing ~]# rpm -ivh MySQL-server-5.5.31-2.linux2.6.x86_64.rpm 
准备中...                          ################################# [100%]
正在升级/安装...
   1:MySQL-server-5.5.31-2.linux2.6   ################################# [100%]

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 ningxing 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.

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

第六步：安装MySQL客户端

rpm -ivh MySQL-client-5.5.31-2.linux2.6.x86_64.rpm

第七步：启动MySQL服务

service mysql start

第八步：设置MySQL

/usr/bin/mysql_secure_installation

[root@ningxing ~]# /usr/bin/mysql_secure_installation




NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MySQL
      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!


In order to log into MySQL to secure it, we'll need the current
password for the root user.  If you've just installed MySQL, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.

Enter current password for root (enter for none): 
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
Enter current password for root (enter for none): 
OK, successfully used password, moving on...

Setting the root password ensures that nobody can log into the MySQL
root user without the proper authorisation.

Set root password? [Y/n] y
New password: 
Re-enter new password: 
Password updated successfully!
Reloading privilege tables..
 ... Success!


By default, a MySQL installation has an anonymous user, allowing anyone
to log into MySQL without having to have a user account created for
them.  This is intended only for testing, and to make the installation
go a bit smoother.  You should remove them before moving into a
production environment.

Remove anonymous users? [Y/n] y
 ... Success!

Normally, root should only be allowed to connect from 'localhost'.  This
ensures that someone cannot guess at the root password from the network.

Disallow root login remotely? [Y/n] n
 ... skipping.

By default, MySQL comes with a database named 'test' that anyone can
access.  This is also intended only for testing, and should be removed
before moving into a production environment.

Remove test database and access to it? [Y/n] y
 - Dropping test database...
 ... Success!
 - Removing privileges on test database...
 ... Success!

Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.

Reload privilege tables now? [Y/n] y
 ... Success!

Cleaning up...



All done!  If you've completed all of the above steps, your MySQL
installation should now be secure.

Thanks for using MySQL!