centos修改MysqL密码或者
进入MysqL后解决Access denied for user ”@’localhost’ to database ‘MysqL错误

原因是MysqL的密码有问题
用MysqL匿名用户可以进入数据库，但是看不见MysqL数据库.
解决办法：
具体操作步骤：
关闭MysqL:

service MysqLd stop

然后:

MysqLd_safe –skip-grant-tables

开启另一个终端并启动MysqL:

service MysqLd start

MysqL -u root
MysqL> use MysqL
MysqL> UPDATE user SET Password=PASSWORD(‘root’) WHERE user=’root’;
MysqL> flush privileges;
MysqL>\q
到这里密码已经修改成功，
MysqL -u root -p

提示：ERROR 1044 (42000): Access denied for user ”@’localhost’ to database ‘MysqL’。前两天也出现过这个问题，网上找了一个比较流行的方法（见方法一），搞定了。今天又用这个试了试，却搞不定，在网上找了半天，终于发现是因为MysqL数据库的user表里，存在用户名为空的账户即匿名账户，导致登录的时候是虽然用的是root，但实际是匿名登录的，通过错误提示里的”@’localhost’可以看出来，于是解决办法见方法二。

方法一：
1.关闭MysqL
# service MysqLd stop
2.屏蔽权限
# MysqLd_safe –skip-grant-table
屏幕出现： Starting demo from …..
3.新开起一个终端输入
# MysqL -u root MysqL
MysqL> UPDATE user SET Password=PASSWORD(‘newpassword’) where USER=’root’;
MysqL> FLUSH PRIVILEGES;//记得要这句话，否则如果关闭先前的终端，又会出现原来的错误
MysqL> \q

方法二：
1.关闭MysqL
# service MysqLd stop
2.屏蔽权限
# MysqLd_safe –skip-grant-table
屏幕出现： Starting demo from …..
3.新开起一个终端输入
# MysqL -u root MysqL
MysqL> delete from user where USER=”;
MysqL> FLUSH PRIVILEGES;//记得要这句话，否则如果关闭先前的终端，又会出现原来的错误
MysqL> \q

/etc/my.cnf文件内容如下:

skip_grant_tables改为skip_grant_tables保存后,重启MysqL服务,然后改密码和删除user=”的记录

# For advice on how to change settings please see
# http://dev.MysqL.com/doc/refman/5.6/en/server-configuration-defaults.html

[MysqLd]
character-set-server=utf8
#bind-address=0.0.0.0
port=3306

#skip_grant_tables
max_connections=200
#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MysqL. Start at 70% of total RAM for dedicated server,else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed,experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
datadir=/var/lib/MysqL
socket=/var/lib/MysqL/MysqL.sock

# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

# Recommended in standard MysqL setup
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES 

[MysqLd_safe]
log-error=/var/log/MysqLd.log
pid-file=/var/run/MysqLd/MysqLd.pid

MysqL永许远程访问方法:

MysqL账户是否不允许远程连接。如果无法连接可以尝试以下方法：

    MysqL -u root -p    //登录MysqL 
    MysqL> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%'WITH GRANT OPTION;     //任何远程主机都可以访问数据库 
    MysqL> FLUSH PRIVILEGES;    //需要输入次命令使修改生效
    MysqL> EXIT    //退出

    也可以通过修改表来实现远程：

    MysqL -u root -p

    MysqL> use MysqL; 
    MysqL> update user set host = '%' where user = 'root'; 
    MysqL> select host,user from user;