Ubuntu-20.04安装MySQL 8

下载仓库地址

1. 进入MySQL官网
   https://www.mysql.com/
   
2. 点击【Download】
   
3. 鼠标滑动到页面底部，选择【MySQL Community (GPL) Downloads »】
   4. 点击MySQL APT Repository
   
4. 点击Download
   
5. 点击No thanks, just start my download.，或者复制其地址：https://dev.mysql.com/get/mysql-apt-config_0.8.24-1_all.deb
   

cd /usr/local/src/
wget https://dev.mysql.com/get/mysql-apt-config_0.8.24-1_all.deb

安装

添加镜像库

dpkg -i mysql-apt-config_0.8.24-1_all.deb
apt update

安装MySQL 8

apt install mysql-server

设置用户

mysql -uroot

CREATE USER 'root'@'%' IDENTIFIED BY '123456';
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%';
FLUSH PRIVILEGES;

• 修改root@localhost密码不生效

ALTER USER 'root'@'%' IDENTIFIED BY '123456';

以mysql -uroot还是能够登录？
问题可能是auth_socket认证引起的，执行以下命令查看是否为

mysql> select plugin,authentication_string from mysql.user where user = 'root';
+-----------------------+-------------------------------------------+
| plugin                | authentication_string                     |
+-----------------------+-------------------------------------------+
| auth_socket           |                                           |
+-----------------------+-------------------------------------------+
2 rows in set (0.00 sec)

mysql> 

这个时候只需要修改认证方式为mysql_native_password即可

ysql> alter user 'root'@'localhost' identified with mysql_native_password by '123456';
Query OK, 0 rows affected (0.01 sec)

mysql> select plugin,authentication_string from mysql.user where user = 'root'
    -> ;
+-----------------------+-------------------------------------------+
| plugin                | authentication_string                     |
+-----------------------+-------------------------------------------+
| mysql_native_password | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |
+-----------------------+-------------------------------------------+
1 row in set (0.00 sec)

mysql> exit
Bye
root@VM-0-5-ubuntu:/home/lighthouse# mysql -uroot
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
root@VM-0-5-ubuntu:/home/lighthouse# mysql -uroot -p123456
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 36
Server version: 8.0.31 MySQL Community Server - GPL

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mysql>