下載mysql的安裝包
訪問mysql網站或者直接打開下載鏈接選擇需要的mysql版本下載，這里選擇mysql 8.0.20，如圖：

也可以直接使用下面的命令下載：

#下載mysql
wget https://cdn.mysql.com/archives/mysql-8.0/mysql-8.0.20-1.el7.x86_64.rpm-bundle.tar

安裝mysql

#查看系統(tǒng)發(fā)行版本號
cat /etc/redhat-release
CentOS Linux release 7.8.2003 (Core)

#解壓安裝包
tar -zxvf mysql-8.0.20-1.el7.x86_64.rpm-bundle.tar
#解壓后文件如下
mysql-community-client-8.0.20-1.el7.x86_64.rpm
mysql-community-common-8.0.20-1.el7.x86_64.rpm
mysql-community-devel-8.0.20-1.el7.x86_64.rpm
mysql-community-embedded-compat-8.0.20-1.el7.x86_64.rpm
mysql-community-libs-8.0.20-1.el7.x86_64.rpm
mysql-community-libs-compat-8.0.20-1.el7.x86_64.rpm
mysql-community-server-8.0.20-1.el7.x86_64.rpm
mysql-community-test-8.0.20-1.el7.x86_64.rpm
#這里安裝client、common、devel、libs、server即可

#使用rpm通過如下命令安裝所需軟件包
rpm -ivh mysql-community-common-8.0.20-1.el7.x86_64.rpm
rpm -ivh mysql-community-libs-8.0.20-1.el7.x86_64.rpm
rpm -ivh mysql-community-client-8.0.20-1.el7.x86_64.rpm
rpm -ivh mysql-community-server-8.0.20-1.el7.x86_64.rpm
rpm -ivh mysql-community-devel-8.0.20-1.el7.x86_64.rpm

初始化并啟動mysql

#初始化數據庫
mysqld --initialize
#設置mysql數據目錄所有者
chown -R mysql:mysql /var/lib/mysql
#開啟mysql服務
systemctl start mysqld

登錄mysql并設置權限

#查看mysql初始登錄密碼
cat /var/log/mysqld.log | grep password
2021-03-01T07:22:44.370984Z 6 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: wMrb1f_iqkKz

#登錄mysql
mysql -uroot -p

#修改密碼
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '新密碼';

#遠程訪問授權
create user 'root'@'%' identified with mysql_native_password by '密碼';
grant all privileges on *.* to 'root'@'%' with grant option;
flush privileges;

可視化工具兼容
MySQL 8.0 和以前的版本加密規(guī)則不一樣，而現在的可視化工具只支持舊的加密方式，具體原因點這里，使用如下命令修改加密規(guī)則：

ALTER USER 'root'@'localhost' IDENTIFIED BY '密碼' PASSWORD EXPIRE NEVER;
flush privileges;