首页 > 代码库 > 用户管理模块之mysql.user
用户管理模块之mysql.user
不使用-h参数来指定登录host，默认会连接localhost，仅当mysql.user表中有一条对应的localhost访问授权(username@%不对任何主机做限制也不行)时登录才成功，否则登录会被拒绝。
虚拟机VMUest上安装两个MySQL实例，两个实例搭建了Master(端口3306)-Slave(端口3307)，主从数据完全一致。
mysql> select Host,User,Password from mysql.user;+-----------------------+--------+-------------------------------------------+| Host | User | Password |+-----------------------+--------+-------------------------------------------+| localhost | root | *6B4F89A54E2D27ECD7E8DA05B4AB8FD9D1D8B119 || localhost.localdomain | root | || 127.0.0.1 | root | || ::1 | root | || localhost | | || localhost.localdomain | | || % | mydba | *80BF8C1F4008F25267DB194E29D2E8BC20C836ED || % | backup | *975B2CD4FF9AE554FE8AD33168FBFC326D2021DD || 192.168.85.% | repl | *A424E797037BF97C19A2E88CF7891C5C2038C039 |+-----------------------+--------+-------------------------------------------+9 rows in set
使用root用户登录
#不指定-h参数，默认就会走localhost[uest@VMUest ~]$ mysql -uroot -pEnter password: Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 3Server version: 5.6.35-log Source distributionCopyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.mysql> select @@port;+--------+| @@port |+--------+| 3306 |+--------+1 row in set (0.00 sec)mysql> exitBye[uest@VMUest ~]$ mysql -uroot -p -P3307Enter password: Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 4Server version: 5.6.35-log Source distributionCopyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.mysql> select @@port;+--------+| @@port |+--------+| 3306 |+--------+1 row in set (0.00 sec)mysql> exitBye#指定-h+ip参考，同时指定-P端口[uest@VMUest ~]$ mysql -uroot -p -h127.0.0.1 -P3306Enter password: Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 5Server version: 5.6.35-log Source distributionCopyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.mysql> select @@port;+--------+| @@port |+--------+| 3306 |+--------+1 row in set (0.00 sec)mysql> exitBye[uest@VMUest ~]$ mysql -uroot -p -h127.0.0.1 -P3307Enter password: Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 3Server version: 5.6.35-log Source distributionCopyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.mysql> select @@port;+--------+| @@port |+--------+| 3307 |+--------+1 row in set (0.00 sec)mysql> exitBye#指定-h+localhost参考，同时指定-P端口[uest@VMUest ~]$ mysql -uroot -p -hlocalhost -P3307Enter password: Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 10Server version: 5.6.35-log Source distributionCopyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.mysql> select @@port;+--------+| @@port |+--------+| 3306 |+--------+1 row in set (0.00 sec)mysql> exitBye[uest@VMUest ~]$
从上面的结果可以看出只有在指定-h+ip，同时指定-P端口的情况下，才能连接到指定的端口中。
注意：我们的mysql.user表中root@‘127.0.0.1‘对应的Password为空(即不需要输入密码)，但实际登录过程需要输入密码。这是受skip_name_resolve参数影响
mysql> show variables like ‘%skip_name_resolve%‘;+-------------------+-------+| Variable_name | Value |+-------------------+-------+| skip_name_resolve | OFF |+-------------------+-------+1 row in set
该参数的值为OFF，root@‘127.0.0.1‘会转化为root@‘localhost‘登录，它使用的是root@‘localhost‘定义的密码。可尝试开启skip_name_resolve参数(配置文件my.cnf中添加skip_name_resolve=1)，然后使用空密码登录。
mysql.user表中第5条记录Host=‘localhost‘，User和Password字段为空，也就是localhost可以不指定用户、密码直接登录
[uest@VMUest ~]$ mysqlWelcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 26Server version: 5.6.35-log Source distributionCopyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.mysql> select @@port;+--------+| @@port |+--------+| 3306 |+--------+1 row in set (0.00 sec)mysql>
还是有一些小细节需要注意。引用iVictor一段话：‘t1‘@‘%‘中包含‘t1‘@‘127.0.0.1‘，如果开启skip_name_resolve参数，则‘t1‘@‘%‘中定义的密码可用于‘t1‘@‘127.0.0.1‘的登录，如果没有开启该参数，则‘t1‘@‘127.0.0.1‘会转化为‘t1‘@‘localhost‘登录，此时‘t1‘@‘%‘定义的密码并不适用。
用户管理模块之mysql.user
声明：以上内容来自用户投稿及互联网公开渠道收集整理发布，本网站不拥有所有权，未作人工编辑处理，也不承担相关法律责任，若内容有误或涉及侵权可进行投诉： 投诉/举报 工作人员会在5个工作日内联系你，一经查实，本站将立刻删除涉嫌侵权内容。