MySQL 5.7 误删管理员root%’localhost’账户

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MySQL 5.7 误删管理员 root%’localhost’ 账户的解决方法。

1）停止数据库
kill Mysql 进程

2）在加上 –skip-grant-tables 启动 mysql 进程加粗样式
其中 –skip-grant-tables 意思是启动 MySQL 服务的时候跳过权限表认证。
启动后，连接到 MySQL 的 root 将不需要口令
cd /mysqldata/mysql/bin
./mysqld_safe –defaults-file=/etc/my.cnf –user=mysql –skip-grant-tables&

3）用空密码的 root 用户连接到 MySQL，并且更改 root 口令
mysql -uroot -p
use mysql;
insert into user set user=’root’,ssl_cipher=”,x509_issuer=”,x509_subject=”;
flush privileges;
GRANT ALL PRIVILEGES ON *.* TO ‘root’@’localhost’ IDENTIFIED BY ‘mN6WT8c#’ WITH GRANT OPTION;
flush privileges;

4）此时查看新添加用户的权限
mysql> select * from mysql.user where user=’root’\G;
*************************** 1. row ***************************
Host: localhost
User: root
Select_priv: Y
Insert_priv: Y
Update_priv: Y
Delete_priv: Y
Create_priv: Y
Drop_priv: Y
Reload_priv: Y
Shutdown_priv: Y
Process_priv: Y
File_priv: Y
Grant_priv: Y
References_priv: Y
Index_priv: Y
Alter_priv: Y
Show_db_priv: Y
Super_priv: Y
Create_tmp_table_priv: Y
Lock_tables_priv: Y
Execute_priv: Y
Repl_slave_priv: Y
Repl_client_priv: Y
Create_view_priv: Y
Show_view_priv: Y
Create_routine_priv: Y
Alter_routine_priv: Y
Create_user_priv: Y
Event_priv: Y
Trigger_priv: Y
Create_tablespace_priv: Y
ssl_type:
ssl_cipher:
x509_issuer:
x509_subject:
max_questions: 0
max_updates: 0
max_connections: 0
max_user_connections: 0
plugin: mysql_native_password
authentication_string: *A1027271824AD76D2BBEED42D431EF9273BB492A
password_expired: N
password_last_changed: 2019-07-11 16:29:23
password_lifetime: NULL
account_locked: N
*************************** 2. row ***************************
Host: %
User: root
Select_priv: Y
Insert_priv: Y
Update_priv: Y
Delete_priv: Y
Create_priv: Y
Drop_priv: Y
Reload_priv: Y
Shutdown_priv: Y
Process_priv: Y
File_priv: Y
Grant_priv: N
References_priv: Y
Index_priv: Y
Alter_priv: Y
Show_db_priv: Y
Super_priv: Y
Create_tmp_table_priv: Y
Lock_tables_priv: Y
Execute_priv: Y
Repl_slave_priv: Y
Repl_client_priv: Y
Create_view_priv: Y
Show_view_priv: Y
Create_routine_priv: Y
Alter_routine_priv: Y
Create_user_priv: Y
Event_priv: Y
Trigger_priv: Y
Create_tablespace_priv: Y
ssl_type:
ssl_cipher:
x509_issuer:
x509_subject:
max_questions: 0
max_updates: 0
max_connections: 0
max_user_connections: 0
plugin: mysql_native_password
authentication_string: *A1F1CB851D62F002C09A0C9C4A76262473432F55
password_expired: N
password_last_changed: 2019-07-04 16:55:40
password_lifetime: NULL
account_locked: N
2 rows in set (0.00 sec)