分析mysqld的skip-grant-tables选项

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这个选项会导致不使用权限系统来启动服务器，它将让任何用户可以访问服务器并且不受限制的访问所有数据库。在不使用授权表启动服务器后可以通过shell来执行mysqladmin flush-privileges或mysqladmin reload命令或者在连接到服务器后执行flush privileges语句来让正在运行的服务器再次使用授权表。

使用--skip-grant-tables选项启动服务器

[root@localhost mysql]# service mysqld stopShutting down MySQL. SUCCESS! [root@localhost mysql]# service mysqld start --skip-grant-tablesStarting MySQL.. SUCCESS!

现在就可以不使用用户和密码就可以登录服务器

[mysql@localhost ~]$ mysqlWelcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 2Server version: 5.7.26-log Source distributionCopyright (c) 2000, 2019, 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>

现在可以执行mysqladin flush-privileges命令让正在运行的服务器再次使用授权表

[mysql@localhost ~]$ mysqladmin  flush-privileges

现在不使用用户和密码就不能登录服务器了，必须使用用户和密码才能登录了

[mysql@localhost ~]$ mysqlERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)[mysql@localhost ~]$ mysql -uroot -pabcd mysqlmysql: [Warning] Using a password on the command line interface can be insecure.Reading table information for completion of table and column namesYou can turn off this feature to get a quicker startup with -AWelcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 5Server version: 5.7.26-log Source distributionCopyright (c) 2000, 2019, 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.

再次使用--skip-grant-tables选项启动服务器

[root@localhost mysql]# service mysqld stopShutting down MySQL.. SUCCESS! [root@localhost mysql]# service mysqld start --skip-grant-tablesStarting MySQL.. SUCCESS!

现在就可以不使用用户和密码就可以登录服务器

[mysql@localhost ~]$ mysqlWelcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 2Server version: 5.7.26-log Source distributionCopyright (c) 2000, 2019, 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>

现在可以执行mysqladin reload命令让正在运行的服务器再次使用授权表

mysql@localhost ~]$ mysqladmin reload

现在不使用用户和密码就不能登录服务器了，必须使用用户和密码才能登录了

[mysql@localhost ~]$ mysqlERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)[mysql@localhost ~]$ mysql -uroot -pabcd mysqlmysql: [Warning] Using a password on the command line interface can be insecure.Reading table information for completion of table and column namesYou can turn off this feature to get a quicker startup with -AWelcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 5Server version: 5.7.26-log Source distributionCopyright (c) 2000, 2019, 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.

再次使用--skip-grant-tables选项启动服务器

[root@localhost mysql]# service mysqld stopShutting down MySQL. SUCCESS! [root@localhost mysql]# service mysqld start --skip-grant-tablesStarting MySQL.. SUCCESS!

现在就可以不使用用户和密码就可以登录服务器

[mysql@localhost ~]$ mysqlWelcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 2Server version: 5.7.26-log Source distributionCopyright (c) 2000, 2019, 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>

现在可以执行flush privileges语句让正在运行的服务器再次使用授权表

mysql> flush privileges;Query OK, 0 rows affected (0.12 sec)

现在不使用用户和密码就不能登录服务器了，必须使用用户和密码才能登录了

[mysql@localhost ~]$ mysqlERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)[mysql@localhost ~]$ mysql -uroot -pabcd mysqlmysql: [Warning] Using a password on the command line interface can be insecure.Reading table information for completion of table and column namesYou can turn off this feature to get a quicker startup with -AWelcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 5Server version: 5.7.26-log Source distributionCopyright (c) 2000, 2019, 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.

--skip-grant-tables选项也可以在选项文件my.cnf中进行设置。这个选项还会导致服务器在启动过程中禁止加载用户定义函数(udf)，调度事件和安装插件语句中安装的插件。为了以任何方式来加载插件，使用--plugin-load选项。--skip-grant-tables选项也会导致disabled_storage_engines系统变量失效。

flush privileges语句可以在服务器启动后通过执行其它操作来隐式执行。例如在升级过程中mysql_upgrade程序就会刷新权限。

感谢各位的阅读，以上就是"分析mysqld的skip-grant-tables选项"的内容了，经过本文的学习后，相信大家对分析mysqld的skip-grant-tables选项这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是，小编将为大家推送更多相关知识点的文章，欢迎关注！