mysql关于用户密码的设置（ 修改、重置、找回）

swer332

1.登录mysql

1.1单实例登录

1) mysql     刚装完mysql无密码情况下登录

2) mysql–u root   刚装完mysql无密码情况下登录  

3) mysql–u root –p   标准的dba登录

3) mysql–u root –p ‘密码’  无交互登录。一般不用，容易泄漏密码

登录成功后 提示：mysql>

1.2 多实例登录

        mysql –u root –S 指定mysql.sock文件的位置

        提示：和单实例唯一的区别是多实例需要指定mysql.sock的位置

2.修改用户密码

1.1交互式修改root密码

• 
  
  
  • 单实例：mysqladmin–u root –p password ‘新密码’
    
    

1 2	[iyunv@Mysql ~]# mysqladmin -u root -p password 'jeck123'         Enter password:           ----->输入旧密码

• 
  
  
  • 多实例：mysqladmin –u root –p password ‘新密码’  -S mysql.sock的位置
    
    

1 2	[iyunv@Mysql ~]# mysqladmin -u root -p password 'jeck123' -S/usr/local/mysql/tmp/mysql.sock     Enter password:          ----->输入旧密码

        注意：若刚装完mysql，则root密码为空，直接回车即可

1.2非交互式修改root密码

• 
  
  
  • 单实例：mysqladmin –u root –p‘旧密码’  password  ‘新密码’（注意-p后面无空格）
    
    

1	[iyunv@Mysql ~]# mysqladmin -uroot -p'jeck123' password '123jeck'

• 
  
  
  • 多实例：mysqladmin –u root –p‘旧密码’  password  ‘新密码’  -S mysql.sock的位置
    
    

1	[iyunv@Mysql ~]# mysqladmin -uroot -p'jeck123' password '123jeck'-S /usr/local/mysql/tmp/mysql.sock

    这种用于非交互式修改密码，适用于脚本

1.3在mysql数据库中修改密码

方法一：(只能修改当前登录mysql用户的密码)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

[iyunv@Mysql ~]# mysql -uroot -p123jeck Welcometo the MySQL monitor.  Commands end with; or \g. YourMySQL connection id is 4 Serverversion: 5.1.56-log Source distribution Copyright(c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. Thissoftware comes with ABSOLUTELY NO WARRANTY. This is free software, andyou are welcome to modify and redistribute it under the GPL v2 license Type'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> setpassword=password('456jeck'); Query OK, 0 rows affected (0.00 sec) mysql> flushprivileges; Query OK, 0 rows affected (0.00 sec) mysql> exit

方法二：（可以修改任意用户的密码，只要有修改权限）

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

[iyunv@Mysql ~]# mysql -uroot -p456jeck Welcometo the MySQL monitor.  Commands end with; or \g. YourMySQL connection id is 6 Serverversion: 5.1.56-log Source distribution Copyright(c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. Thissoftware comes with ABSOLUTELY NO WARRANTY. This is free software, andyou are welcome to modify and redistribute it under the GPL v2 license Type'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> updatemysql.user set password=PASSWORD('789jeck') where user='root'; Query OK, 3 rows affected (0.00 sec) Rows matched: 3  Changed:3  Warnings: 0 mysql> flushprivileges; Query OK, 0 rows affected (0.00 sec) mysql>

3.找回用户密码

3.1关闭mysql

1 2 3

[iyunv@Mysql~]# service mysqld stop Shuttingdown MySQL. SUCCESS! [iyunv@Mysql ~]# netstat -lnt | grep mysqld

3.2用mysqld_safe启动mysql，需要加—skip-grant-tables（忽略授权验证）

单实例：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

[iyunv@Mysql~]# /usr/local/mysql/bin/mysqld_safe--skip-grant-tables &   --->加&，使进程在后台运行 [1]28643 15010315:56:25 mysqld_safe Logging to '/usr/local/mysql-5.1.56/data/Mysql.err'. 15010315:56:25 mysqld_safe Starting mysqld daemon with databases from/usr/local/mysql-5.1.56/data [iyunv@Mysql ~]# mysql -uroot -p Enter password:              ---->直接回车，因为已经忽略验证 Welcometo the MySQL monitor.  Commands end with; or \g. YourMySQL connection id is 1 Serverversion: 5.1.56-log Source distribution Copyright(c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. Thissoftware comes with ABSOLUTELY NO WARRANTY. This is free software, andyou are welcome to modify and redistribute it under the GPL v2 license Type'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> setpassword=password('jeck123');            --->此方法不行 ERROR 1290 (HY000): The MySQL server is running with the--skip-grant-tables option so it cannot execute this statement mysql> updatemysql.user set password=PASSWORD('jeck123') where user='root';    Query OK, 3 rows affected (0.00 sec) Rows matched: 3  Changed:3  Warnings: 0 mysql> flushprivileges; Query OK, 0 rows affected (0.00 sec) mysql> exit Bye

多实例：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

[iyunv@Mysql~]# /usr/local/mysql/bin/mysqld_safe--defaults-file=/etc/my.cnf --skip-grant-tables & [1]28643 15010315:56:25 mysqld_safe Logging to '/usr/local/mysql-5.1.56/data/Mysql.err'. 15010315:56:25 mysqld_safe Starting mysqld daemon with databases from/usr/local/mysql-5.1.56/data [iyunv@Mysql ~]# mysql -uroot -p   -S/usr/local/mysql/tmp/mysql.sock   Enter password:              ---->直接回车，因为已经忽略验证 Welcometo the MySQL monitor.  Commands end with; or \g. YourMySQL connection id is 1 Serverversion: 5.1.56-log Source distribution Copyright(c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. Thissoftware comes with ABSOLUTELY NO WARRANTY. This is free software, andyou are welcome to modify and redistribute it under the GPL v2 license Type'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> updatemysql.user set password=PASSWORD('jeck123') where user='root';               ---->修改root密码    Query OK, 3 rows affected (0.00 sec) Rows matched: 3  Changed:3  Warnings: 0 mysql> flushprivileges; Query OK, 0 rows affected (0.00 sec) mysql> exit Bye

3.3重新启动mysql（必须重新启动）

1 2 3 4 5

[iyunv@Mysql~]# service mysqld restart Shuttingdown MySQL.150103 16:07:17 mysqld_safe mysqld from pid file/usr/local/mysql-5.1.56/data/Mysql.pid ended SUCCESS! StartingMySQL. SUCCESS! [1]+  Done                   /usr/local/mysql/bin/mysqld_safe --skip-grant-tables

3.4用新修改的密码就可以登录了

1 2 3 4 5 6 7 8 9 10

[iyunv@Mysql~]# mysql -uroot -pjeck123 Welcometo the MySQL monitor.  Commands end with; or \g. YourMySQL connection id is 1 Serverversion: 5.1.56-log Source distribution Copyright(c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. Thissoftware comes with ABSOLUTELY NO WARRANTY. This is free software, andyou are welcome to modify and redistribute it under the GPL v2 license Type'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql>