今天尝试在Ubuntu虚拟机上安装MySql 数据库(版本是:5.7.23-0Ubuntu0.18.04.1),数据库安装很简单,就是三行命令:
- sudo apt-get install mysql-server # 下载安装mysql的服务端
- sudo apt-get install mysql-client # 下载安装mysql的客户端
- sudo apt-get install libmysqlclient-dev
但是,看似很顺利简单的安装过程,在第一次登陆的时候却遇到了麻烦。
- ~$ mysql -u root -p
- Enter password:
- ERROR 1698 (28000): Access denied for user 'root'@'localhost'
然后,在网上找了很多的教程,最后实验成功的是这个方案:
解决步骤:
(1) 停止mysql服务:
~$ sudo service mysql stop
(2)以安全模式启动MySQL:
~$ sudo mysqld_safe --skip-grant-tables &
(3)MySQL启动之后就可以不用密码登陆了:
- ~$ mysql -u root
- Welcome to the MySQL monitor. Commands end with ; or \g.
- Your MySQL connection id is 2
- Server version: 5.7.10 MySQL Community Server (GPL)
(4)查看一下user表,错误的起因就是在这里, root的plugin被修改成了auth_socket,用密码登陆的plugin应该是mysql_native_password。
- mysql> select user, plugin from mysql.user;
- +-----------+-----------------------+
- | user | plugin |
- +-----------+-----------------------+
- | root | auth_socket |
- | mysql.sys | mysql_native_password |
- | dev | mysql_native_password |
- +-----------+-----------------------+
- 3 rows in set (0.01 sec)
(5)关于auth_socket,在官方有说明: https://dev.mysql.com/doc/mysql-security-excerpt/5.5/en/socket-authentication-plugin.html ,反正现在暂时不用它, 那就把这里改了。
- mysql> update mysql.user set authentication_string=PASSWORD('newPwd'), 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> flush privileges;
- Query OK, 0 rows affected (0.00 sec)
(6)重启服务,问题就解决了:
- ~$ sudo service mysql stop
- ...
- * MySQL Community Server 5.7.10 is stopped
- ~$ sudo service mysql start
- ..
- * MySQL Community Server 5.7.10 is started
- ~$ mysql -u root -p
- Enter password:
- Welcome to the MySQL monitor. Commands end with ; or \g.
- Your MySQL connection id is 2
- Server version: 5.7.10 MySQL Community Server (GPL)