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今天在linuxmint上安装了一个mysql
$ mysql --version
mysql Ver 14.14 Distrib 5.7.25, for Linux (x86_64) using EditLine wrapper但是出现了登录不上的问题。
Failed to start mysqld.service: Unit mysqld.service not found.
$ mysql -uroot -p
Enter password:
ERROR 1698 (28000): Access denied for user 'root'@'localhost'
$ systemctl start mysql
$ mysql -uroot -p
Enter password:
ERROR 1698 (28000): Access denied for user 'root'@'localhost'修改文件：mysqld.cnf
$ sudo vim /etc/mysql/mysql.conf.d/mysqld.cnf
38 lc-messages-dir = /usr/share/mysql
39 skip-external-locking
40 #toa 2019.03.13 10:16
41 skip-grant-tables
42 #重启mysql
$ service mysql restart再次连接
$ mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.25-0ubuntu0.18.04.2 (Ubuntu)
Copyright (c) 2000, 2019, 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>登陆上了，然后我quit，将上面修改后的文件注释掉
$ sudo vim /etc/mysql/mysql.conf.d/mysqld.cnf
38 lc-messages-dir = /usr/share/mysql
39 skip-external-locking
40 #toa 2019.03.13 10:16
41 #skip-grant-tables
42 #
$ service mysql restart
$ mysql -uroot -p
Enter password:
ERROR 1698 (28000): Access denied for user 'root'@'localhost'发现又登录不上去了，然后。。。重复上面的过程，进去MySQL。
修改密码
mysql> use mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> update user set authentication_string=password("root ") where user="root";
Query OK, 1 row affected, 1 warning (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 1
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> quit
Bye将密码方式改为常规
mysql> select user,plugin from user;
+------------------+-----------------------+
| user | plugin |
+------------------+-----------------------+
| root | auth_socket |
| mysql.session | mysql_native_password |
| mysql.sys | mysql_native_password |
| debian-sys-maint | mysql_native_password |
+------------------+-----------------------+
4 rows in set (0.00 sec)
mysql> update user set authentication_string=password("root "),plugin='mysql_native_password' where user='root'
-> ;
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 1
mysql> select user,plugin from user;
+------------------+-----------------------+
| user | plugin |
+------------------+-----------------------+
| root | mysql_native_password |
| mysql.session | mysql_native_password |
| mysql.sys | mysql_native_password |
| debian-sys-maint | mysql_native_password |
+------------------+-----------------------+
4 rows in set (0.00 sec)
mysql> exit
Bye
然后退出，将修改后的文件注释后，重启mysql。发现可以了，正常登入
$ mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
...
mysql>