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本篇內(nèi)容介紹了“MySQL誤刪root用戶怎么恢復(fù)”的有關(guān)知識(shí),在實(shí)際案例的操作過(guò)程中,不少人都會(huì)遇到這樣的困境,接下來(lái)就讓小編帶領(lǐng)大家學(xué)習(xí)一下如何處理這些情況吧!希望大家仔細(xì)閱讀,能夠?qū)W有所成!
一個(gè)朋友在領(lǐng)導(dǎo)要求他刪除root@127.0.0.1,root@'%'等用戶,只保留root@localhost時(shí),
他寫(xiě)了一條類似delete from mysql.user where user='root'的命令……
注意,他并沒(méi)有寫(xiě) “and host=”的條件,導(dǎo)致悲劇發(fā)生,并且還flush了授權(quán)。
以下模擬誤刪操作,嘗試做恢復(fù):
MySQL版本:
MySQL 5.5.49
模擬誤刪操作:
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)
解決思路:
新安裝或者初始化一個(gè)新的實(shí)例(與誤刪操作的MySQL版本最好一致)
初始化好后,啟動(dòng)實(shí)例,并以root@localhost用戶登錄,然后設(shè)置密碼:
新實(shí)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)
將存放在mysql.user里的root@localhost用戶信息查詢出:
mysql> SELECT * FROM mysql.user WHERE user='root' AND host='localhost' INTO OUTFILE '/tmp/root.txt';
Query OK, 1 row affected (0.00 sec)
對(duì)于誤刪操作的實(shí)例:
首先將之前查詢出的/tmp/root.txt文件傳到該機(jī)上,此處傳到同目錄下,操作略。
然后要停掉mysqld,并繞過(guò)授權(quán)表啟動(dòng):
可能無(wú)法通過(guò)mysqladmin shutdown來(lái)停止,此處直接kill掉mysqld_safe與mysqld,操作略。
然后啟動(dòng):
[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
進(jìn)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,已經(jīng)沒(méi)有了誤刪的root用戶,只剩下xxx@'ip1',yyy@'ip2',這樣的業(yè)務(wù)用戶:
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)
將之前的新實(shí)例的mysql.user表中的root@localhost信息導(dǎo)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環(huán)境,關(guān)閉以skip-grant-tables方式啟動(dòng)的mysqld:
此時(shí)已經(jīng)可以用mysqladmin來(lái)關(guān)閉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
再重新啟動(dòng)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
已經(jīng)可以正常使用了,密碼是之前在初始化的新實(shí)例設(shè)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)
查看一下權(quán)限,可以對(duì)比一下,與之前的無(wú)異:
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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