安装MySQL，添加用户

1.卸载掉原有mysql
[root@root ~]# rpm -e mysql　　 // 普通删除模式

[root@root ~]# rpm -e --nodeps mysql // 强力删除模式，如果使用上面命令删除时，提示有依赖的其它文件，则用该命令可以对其进行强力删除

2.通过yum来进行mysql的安装
yum install -y mysql-server mysql mysql-devel

3.修改 /etc/my.cnf (修改前先备份)
[mysqld]
datadir=/data/mysql/data
socket=/data/mysql/mysql.sock
user=mysql
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
max_connections = 5000
wait_timeout = 180
interactive_timeout = 180

[mysqld_safe]
log-error=/data/mysql/log/mysqld.log
pid-file=/data/mysql/mysqld.pid

[client]
socket=/data/mysql/mysql.sock

4.创建目录


mkdir /data/mysql/data -p
mkdir /data/mysql/log
chmod 777 /data/mysql/ -R


5.设置开机启动
chkconfig mysqld on


6.启动mysql 
service mysqld start

7.创建用户、设置权限、应用权限

create user 'root'@'192.168.6.13' identified by 'root';

grant all privileges on *.* to 'root'@'192.168.6.12';

update user set password=password("root");

flush privileges;