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本篇内容介绍了“MySQL 误删 root 用户怎么恢复”的有关知识,在实际案例的操作过程中,不少人都会遇到这样的困境,接下来就让丸趣 TV 小编带领大家学习一下如何处理这些情况吧!希望大家仔细阅读,能够学有所成!
一个朋友在领导要求他删除 root@127.0.0.1,root@ % 等用户,只保留 root@localhost 时,
他写了一条类似 delete from mysql.user where user= root 的命令……
注意,他并没有写“and host=”的条件,导致悲剧发生,并且还 flush 了授权。
以下模拟误删操作,尝试做恢复:
MySQL 版本:
MySQL 5.5.49
模拟误删操作:
mysql DELETE FROM mysql.user WHERE user= root
Query OK, 1 row affected (0.01 sec)
mysql FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.01 sec)
解决思路:
新安装或者初始化一个新的实例(与误删操作的 MySQL 版本最好一致)
初始化好后,启动实例,并以 root@localhost 用户登录,然后设置密码:
新实例上:
mysql SELECT current_user();
+—————-+
| current_user() |
+—————-+
| root@localhost |
+—————-+
1 row in set (0.00 sec)
mysql SET PASSWORD=password(123456
Query OK, 0 rows affected (0.00 sec)
mysql FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)
将存放在 mysql.user 里的 root@localhost 用户信息查询出:
mysql SELECT * FROM mysql.user WHERE user= root AND host= localhost INTO OUTFILE /tmp/root.txt
Query OK, 1 row affected (0.00 sec)
对于误删操作的实例:
首先将之前查询出的 /tmp/root.txt 文件传到该机上,此处传到同目录下,操作略。
然后要停掉 mysqld,并绕过授权表启动:
可能无法通过 mysqladmin shutdown 来停止,此处直接 kill 掉 mysqld_safe 与 mysqld,操作略。
然后启动:
[root@vm02 ~]# mysqld_safe –skip-grant-tables
[1] 2957
[root@vm02 ~]# 160819 17:00:30 mysqld_safe Logging to /data/mysql_log/err-log.err .
160819 17:00:30 mysqld_safe Starting mysqld daemon with databases from /data/mysql
进入 mysql:
[root@vm02 ~]# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.5.49-log 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 SELECT user(),current_user();
+——–+—————-+
| user() | current_user() |
+——–+—————-+
| root@ | @ |
+——–+—————-+
1 row in set (0.00 sec)
可以查看一下 mysql.user 表,已经没有了误删的 root 用户,只剩下 xxx@ ip1,yyy@ ip2,这样的业务用户:
mysql SELECT user,host FROM mysql.user;
+——+—————+
| user | host |
+——+—————+
| xxx | 192.168.1.185 |
| yyy | 192.168.1.187 |
+——+—————+
2 rows in set (0.00 sec)
将之前的新实例的 mysql.user 表中的 root@localhost 信息导入 mysql.user:
mysql LOAD DATA INFILE /tmp/root.txt INTO TABLE mysql.user;
Query OK, 1 row affected (0.04 sec)
Records: 1 Deleted: 0 Skipped: 0 Warnings: 0
mysql FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)
mysql SELECT user,host FROM mysql.user WHERE user= root AND host= localhost
+——+—————+
| user | host |
+——+—————+
| root | localhost |
+——+—————+
1 rows in set (0.00 sec)
退出到 shell 环境,关闭以 skip-grant-tables 方式启动的 mysqld:
此时已经可以用 mysqladmin 来关闭 mysqld 了:
[root@vm02 tmp]# mysqladmin -uroot -p123456 shutdown
160819 17:08:08 mysqld_safe mysqld from pid file /data/mysql/mysql-pid ended
[1]+ Done mysqld_safe –skip-grant-tables (wd: ~)
(wd now: /tmp)
[root@vm02 tmp]# ps -ef|grep mysql
root 3938 1973 0 17:08 pts/0 00:00:00 grep mysql
再重新启动 mysqld:
[root@vm02 tmp]# mysqld_safe
[1] 3939
[root@vm02 tmp]# 160819 17:08:53 mysqld_safe Logging to /data/mysql_log/err-log.err .
160819 17:08:53 mysqld_safe Starting mysqld daemon with databases from /data/mysql
已经可以正常使用了,密码是之前在初始化的新实例设置的:
[root@vm02 tmp]# mysql -uroot -p123456
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.5.49-log 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 SELECT user(),current_user();
+—————-+—————-+
| user() | current_user() |
+—————-+—————-+
| root@localhost | root@localhost |
+—————-+—————-+
1 row in set (0.00 sec)
查看一下权限,可以对比一下,与之前的无异:
mysql SHOW GRANTS;
+—————————————————————————————————————————————-+
| Grants for root@localhost |
+—————————————————————————————————————————————-+
| GRANT ALL PRIVILEGES ON *.* TO root @ localhost IDENTIFIED BY PASSWORD *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 WITH GRANT OPTION |
| GRANT PROXY ON @ TO root @ localhost WITH GRANT OPTION |
+—————————————————————————————————————————————-+
2 rows in set (0.00 sec)
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