centos7.x安装代码：
rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
rpm -Uvh https://mirror.webtatic.com/yum/el7/latest.rpm
centos6.x安装代码：
rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm
rpm -Uvh https://mirror.webtatic.com/yum/el6/latest.rpm
centos5.x安装代码
rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-5.noarch.rpm
rpm -Uvh http://mirror.webtatic.com/yum/el5/latest.rpm
如果你之前安装过老版本的mysql(rpm -q mysql mysql-server), 你可以用下列命令升级:
yum install mysql.'uname -i' yum-plugin-replace yum replace mysql --replace-with mysql55w
“yum install mysql” is only there to make sure yum-plugin-replace can resolve dependencies correctly if only mysql-server was installed.
如果没有安装过，运行下列命令进行安装mysql5.5：
yum install mysql55w mysql55w-server
You should upgrade existing tables before setting the server to become a production machine, which can be done by starting the server and running the mysql_upgrade script (this may take time depending on the size of the database).
启动mysql服务
service mysqld start
# This will issue a password prompt for the user. If you don’t have a root user password, remove the “-p”
mysql_upgrade -u root -p
设置开机启动
chkconfig mysqld on
设置MySQL的root用户设置密码[root@stonex ~]# mysql -u root
Welcome to the MySQL monitor. Commands end with ; or \g.
...... 省略了一些行
mysql> select user,host,password from mysql.user;
查询用户的密码，都为空，用下面的命令设置root的密码为root
mysql> set password for root@localhost=password('root');
mysql> exit
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