1，使用rpm -qa | grep mysql命令，檢查系統是否已經安裝了mysql，如果已經安裝mysql，需要先卸載。
2，添加在線mysql源
vim /etc/yum.repos.d/mysql.repo
將下面的內容添加到mysql源
# Enable to use MySQL 8.0
[mysql80-community]
name=MySQL 8.0 Community Server
baseurl=http://repo.mysql.com/yum/mysql-8.0-community/el/8/x86_64/
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
3，安裝mysql
yum module disable mysql
yum update
yum install -y mysql-community-common mysql-community-libs mysql-community-client mysql-community-server mysql-community-devel
4，啟動mysql服務 (停止mysql服務的命令是：systemctl stop mysqld.service)
systemctl start mysqld.service
5，查看mysql狀態
systemctl status mysqld.service
6，將mysql設置為開機自啟
systemctl enable mysqld.service
7，登錄mysql的時候需要設置密碼：首先生成隨機密碼
grep 'temporary password' /var/log/mysqld.log
8，登錄mysql
mysql -uroot -p
然后輸入剛才收成的隨機密碼
9，接下來我們要修改一下密碼
alter user 'root'@'localhost' identified by 'abc@123456';
重新登錄
mysql就安裝完成了