Linux下安装MySQL8

#下载MySQL8.9仓库文件
wget https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm

#安装仓库文件
rpm -ivh mysql80-community-release-el7-3.noarch.rpm
#建立缓存
yum repolist
yum makecache
#yum安装MySQL8.0
yum -y mysql-community-server.x86_64

#安装成功后查询版本成功则正常安装
[root@google opt]# mysql -V
mysql  Ver 8.0.25 for Linux on x86_64 (MySQL Community Server - GPL)
[root@google opt]# 
#启动MySQL8.0
systemctl start mysqld
#设置开机自启动
systemctl enable mysqld

#获取系统临时密码
[root@google opt]# grep 'password' /var/log/mysqld.log 
2021-05-20T15:50:33.157635Z 6 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: ytYXGuVgJ7-y
[root@google opt]#
#用此密码登录MySQL
[root@google opt]# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.0.25
Copyright (c) 2000, 2021, Oracle and/or its affiliates.
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> 
#修改密码策略
#修改自定义密码，我改为admin@123
#ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY "your_password";
mysql> set global validate_password.policy=0;
Query OK, 0 rows affected (0.00 sec)
mysql>  set global validate_password.length=1;
Query OK, 0 rows affected (0.01 sec)
mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY "admin@123";
Query OK, 0 rows affected (0.01 sec)