1. download RPM: 
1.  wget https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm
2. install RPM :  
1. rpm -ivh mysql57-community-release-el7-11.noarch.rpm
3. Use Aliyun Mirrors :  
1. wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
4. 　　
   
5.  
   
6. Clean cache  and recache : yum clean all  ;  yum makecache
7. 

8. Install MySQL : yum -y install mysql-community-server

9. 
10. 
11. restart mysql service:  systemctl restart mysqld
12. chacke service status: service mysqld status
13. 

14. use cat or vi /var/log/mysqld.log check mysql auto generate password

    

    15.login mysql use ：mysql -u root -p

    16.change defualt password:  set password for root@localhost = password(‘Your@pwd123‘);

    17.If you forget password ,you can user select command find it;

    

    18.About password ：  if the service error log no temp password ,you must be edit /etc/my.cnf  . 

    19. vim /etc/my.cnf         

    20.skip-grant-tablesAsystemctl restart mysqld

    

     

     

Install MySQL Community