1.下載mysql的yum倉(cāng)庫包
sudo wget 'https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm'
2.安裝mysql的yum倉(cāng)庫
sudo rpm -Uvh mysql57-community-release-el7-11.noarch.rpm
3.用yum安裝mysql，可以修改配置文件/etc/yum.repos.d/mysql-community.repo來選擇要安裝的版本（enable字段）
sudo yum install mysql-community-server
4.啟動(dòng)mysql，centos7以后都是用systemctl來管理
sudo systemctl start msyqld
5.查看mysql的初始化密碼
sudo grep 'temporary password' /var/log/mysqld.log
找到生成的臨時(shí)密碼
6.進(jìn)入數(shù)據(jù)庫
mysql -uroot -p #輸入上面查看到的密碼
7.修改密碼，否則啥都干不了
ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!';
命名需要復(fù)雜一點(diǎn)，大小寫，特殊符號(hào)，數(shù)字都要有
