环境：centos 7.2

下载yum包：https://dev.mysql.com/downloads/repo/yum/

安装步骤（参考地址）：

1、安装rpm包

rpm -Uvh mysql80-community-release-el6-n.noarch.rpm

2、设置yum包

yum repolist all | grep mysql
sudo yum-config-manager --disable mysql80-community
sudo yum-config-manager --enable mysql57-community

3、安装mysql

sudo yum install mysql-community-server
错误日志地址：/var/log/mysqld.log
配置文件地址：/etc/my.cnf

4、启动mysql

sudo service mysqld start

5、连接mysql

grep "temporary password" /var/log/mysqld.log #初始密码可以在错误日志中查看
mysql -h localhost -u root -p  #使用初始密码登录