本人使用的mysql版本为5.6.29.
Mysql修改root密码方法：
第一种方法：mysqladmin修改root密码:
1)新数据库,从未设置过root密码,可以使用下面命令：
# mysqladmin -u root password "newpass" #新密码为“newpass”
Warning: Using a password on the command line interface can be insecure.
2)已经设置过root密码,想使用mysqladmin修改,使用下面命令：
[root@localhost ~]# mysqladmin -u root -pnewpass password "redhat" #新密码为“redhat”
Warning: Using a password on the command line interface can be insecure.
截图如下：
错误使用方法:
纠正网上很多博客mysqladmin修改root密码的一个错误命令:
[root@localhost ~]# mysqladmin -u root password redhat "password"
mysqladmin: connect to server at 'localhost' failed
error: 'Access denied for user 'root'@'localhost' (using password: NO)'
注释:看到报错很多人认为权限不够,去设置权限,我也设置了然并卵.网上博客一爬十，十爬百，90%的博客都在写使用上面这条
错误的命令 #mysqladmin -u root password oldpassword "newpassword"。
第二种方法：使用set password命令：
mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('newpass');
Query OK, 0 rows affected (0.00 sec)
截图如下:
第三种方法：使用update user直接登录数据库修改密码:
mysql> update user set password = password('newpass') where user = 'root';
Query OK, 5 rows affected (0.01 sec)
Rows matched: 5 Changed: 5 Warnings: 0
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> \q
截图如下:
第四种方法:使用skip-grant-tables参数可以在my.cnf文件添加,也可以启动时添加.
1)修改my.cnf文件：
[root@localhost ~]# cat /etc/my.cnf | grep skip
skip_name_resolve=on
skip-grant-tables
[root@localhost ~]# /etc/init.d/mysqld restart
Shutting down MySQL.. [ OK ]
Starting MySQL. [ OK ]
[root@localhost ~]# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.29 MySQL Community Server (GPL)
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> quit
Bye
截图如下:
2)启动时添加--skip-grant-tables参数:
[root@localhost ~]# /etc/init.d/mysqld restart --skip-grant-tables
Shutting down MySQL.. [ OK ]
Starting MySQL. [ OK ]
[root@localhost ~]# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.29 MySQL Community Server (GPL)
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> quit
Bye
截图如下:
注意:
下面这条命令试了十几遍也没成功,可能版本不一样吧：
#mysqld_safe --skip-grant-tables &
#没有过滤到任何参数,不确定.
[root@localhost ~]# /data/mysql/bin/mysqld_safe --help | grep skip-grant-table