在CentOS7上配置MySQL5.7需要以下幾個步驟：

1. 安裝MySQL5.7

wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-9.noarch.rpm 
yum -y install mysql57-community-release-el7-9.noarch.rpm 
yum -y install mysql-community-server

2. 啟動MySQL服務

systemctl start mysqld.service

3. 查看MySQL服務狀態

systemctl status mysqld.service

4. 設置MySQL服務為開機自啟動

systemctl enable mysqld.service

5. 修改MySQL初始密碼

grep 'temporary password' /var/log/mysqld.log 
mysql -uroot -p 
ALTER USER 'root'@'localhost' IDENTIFIED BY 'NewPassword';

6. 配置MySQL遠程訪問

mysql'GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'password' WITH GRANT OPTION;'mysql'FLUSH PRIVILEGES;'

7. 配置MySQL外網訪問

vi /etc/selinux/config#SELINUX=enforcingSELINUX=disabledsystemctl restart mysqld

完成了以上步驟，就成功地在CentOS7上配置了MySQL5.7。您可以通過MySQL的客戶端工具連接這個數據庫服務器，并進行相應的操作。