mysql安装在虚拟机中
只能本地访问，设置随意访问
# update user set host='%' where host='localhost'；
# flush privileges;
随意访问，设置只能本地访问
# update user set host = "localhost" where user = "hello" and host= "%";
# flush privileges;
设置固定的ip可以访问
# GRANT ALL PRIVILEGES ON *.* TO 'mysql'@'123.123.123.123' IDENTIFIED BY 'mysql_password' WITH GRANT OPTION;
# flush privileges;
yum方式安装的mysql
1、yum remove mysql mysql-server mysql-libs compat-mysql51
2、rm -rf /var/lib/mysql
3、rm /etc/my.cnf
查看是否还有mysql软件：
rpm -qa|grep mysql
如果存在的话，继续删除即可。
rpm方式安装的mysql
a）查看系统中是否以rpm包安装的mysql：
[root@localhost opt]# rpm -qa | grep -i mysql
MySQL-server-5.6.17-1.el6.i686
MySQL-client-5.6.17-1.el6.i686
b)卸载mysql
[root@localhost local]# rpm -e MySQL-server-5.6.17-1.el6.i686
[root@localhost local]# rpm -e MySQL-client-5.6.17-1.el6.i686
c)删除mysql服务
[root@localhost local]# chkconfig --list | grep -i mysql
[root@localhost local]# chkconfig --del mysql
d)删除分散mysql文件夹
[root@localhost local]# whereis mysql 或者 find / -name mysql
mysql: /usr/lib/mysql /usr/share/mysql
清空相关mysql的所有目录以及文件
rm -rf /usr/lib/mysql
rm -rf /usr/share/mysql
rm -rf /usr/my.cnf
通过以上几步，mysql应该已经完全卸载干净了