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mysql关于用户密码的设置（ 修改、重置、找回）
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’
[root@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
[root@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）
[root@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
[root@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)
[root@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）
[root@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
[root@Mysql~]# service mysqld stop Shuttingdown MySQL. SUCCESS! [root@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：
[root@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 [root@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：
[root@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 [root@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）
[root@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
[root@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>
本文出自 “Study-Everyday” 博客，请务必保留此出处http://studys.blog.51cto.com/9736817/1599104
mysql关于用户密码的设置（ 修改、重置、找回）
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