Ubuntu18.04(linux)安装MySQL

mysql

sudo apt-get --purge remove mysql-server mysql-common mysql-client sudo apt-get install mysql-server mysql-common mysql-client mysqladmin -u root password your-new-password sudo /etc/init.d/mysql restart

mariadb

apt-get install mariadb-server 字符集修改utf8

如果装的mariadb, 默认字符集已经是utf8了。mysql则不是

mysql> show variables like 'char%'; +--------------------------+----------------------------+ | Variable_name | Value | +--------------------------+----------------------------+ | character_set_client | utf8 | | character_set_connection | utf8 | | character_set_database | latin1 | | character_set_filesystem | binary | | character_set_results | utf8 | | character_set_server | latin1 | | character_set_system | utf8 | | character_sets_dir | /usr/share/mysql/charsets/ | +--------------------------+----------------------------+ mysql> show variables like 'collation%'; +----------------------+-------------------+ | Variable_name | Value | +----------------------+-------------------+ | collation_connection | utf8_general_ci | | collation_database | latin1_swedish_ci | | collation_server | latin1_swedish_ci | +----------------------+-------------------+

修改字符集：

sudo vim /etc/mysql/my.cnf

添加以下内容

[mysqld] collation-server = utf8_unicode_ci init-connect='SET NAMES utf8' character-set-server = utf8

重启：

service mysql restart 登录权限问题

Ubuntu18.04 安装mysql或者mariadb之后，发现普通用户和远程都没有权限连接。

ERROR 1045: Access denied for user: 'root@localhost' (Using password: YES)

修改了密码也不对。然后sudo mysql -u root即可登录。这显然不是我们想要的。

解决方案

删除root，重新创建用户。

首先，登录

sudo mysql -u root

然后查看当前用户

SELECT User,Host FROM mysql.user; +------------------+-----------+ | User | Host | +------------------+-----------+ | admin | localhost | | debian-sys-maint | localhost | | magento_user | localhost | | mysql.sys | localhost | | root | localhost |

删除root账号

mysql> DROP USER 'root'@'localhost'; Query OK, 0 rows affected (0,00 sec)

重新创建root：

mysql> CREATE USER 'root'@'%' IDENTIFIED BY '123456'; Query OK, 0 rows affected (0,00 sec)

授权

mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION; Query OK, 0 rows affected (0,00 sec) mysql> FLUSH PRIVILEGES; Query OK, 0 rows affected (0,01 sec) 关于重置密码

host为%时允许远程登录

SET PASSWORD FOR root@'localhost' = PASSWORD('password');

or

UPDATE mysql.user SET Password=PASSWORD('newpwd') WHERE User='root';

or

USE mysql UPDATE user SET Password = PASSWORD('newpwd') WHERE Host = 'localhost' AND User = 'root';

允许任何地方登录

USE mysql UPDATE user SET Password = PASSWORD('newpwd') WHERE Host = '%' AND User = 'root'; 参考

https://askubuntu.com/questions/766334/cant-login-as-mysql-user-root-from-normal-user-account-in-ubuntu-16-04

https://help.ubuntu.com/community/MysqlPasswordReset