1、获取mysql YUM源
进入mysql官网获取RPM包下载地址
https://dev.mysql.com/downloads/repo/yum/

2、下载和安装mysql源
先下载 mysql源安装包
wget https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm
安装mysql源
yum -y localinstall mysql57-community-release-el7-11.noarch.rpm

3、在线安装Mysql
yum -y install mysql-community-server

4、启动Mysql服务
systemctl start mysqld

5、设置开机启动
systemctl enable mysqld
systemctl daemon-reload

6、修改root本地登录密码和远程登录
mysql安装完成之后，在/var/log/mysqld.log文件中给root生成了一个临时的默认密码。
cat /var/log/mysqld.log

mysql -uroot -p 

7、登录后修改密码
ALTER USER 'root'@'localhost' IDENTIFIED BY 'new.Password';
设置允许远程登录
grant all privileges on *.* to root@"%" identified by 'new.Password' with grant option;
FLUSH PRIVILEGES;

8、在防火墙中开通3306端口
firewall-cmd --zone=public --add-port=3306/tcp --permanent
firewall-cmd --reload 

9、验证远程登录
mysql -u root -h 192.168.1.121 -p

10、配置默认编码为UTF-8
修改/etc/my.cnf配置文件，在[mysqld]下添加编码配置，如下所示：
[mysqld]
character_set_server=utf8
init_connect='SET NAMES utf8'
编辑保存完 重启mysql服务
systemctl restart mysqld