1. Download rpm package

   [root@VM_149_46_centos ~]# wget https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm

2. Install rpm package

   [root@VM_149_46_centos ~]# rpm -ivh mysql57-community-release-el7-11.noarch.rpm

3. yum install MySQL

   [root@VM_149_46_centos ~]# yum install mysql-server

4. Test MySql

   [root@VM_149_46_centos ~]# mysql
   ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

   The reason for the error here is the access permission of / var/lib/mysql

   [root@VM_149_46_centos ~]# sudo chown -R root:root /var/lib/mysql
   [root@VM_149_46_centos ~]# service mysqld restart
   Redirecting to /bin/systemctl restart  mysqld.service
   

   In this way, you can change the file permissions and restart the mysql service

5. Configure login password and Mysql port

   [root@VM_149_46_centos ~]# mysql -u root
   ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

   This is a password error. Look up the random password generated by default

   [root@VM_149_46_centos ~]# grep 'temporary password' /var/log/mysqld.log
   2018-02-05T05:50:32.354328Z 1 [Note] A temporary password is generated for root@localhost: :Fda,R:=u0q)

   : Fda,R:=u0q) is the default generated password
   Use the login command and enter the password

   [root@VM_149_46_centos ~]# mysql -u root -p 

   To change the default password:

   mysql > ALTER USER 'root'@'localhost' IDENTIFIED BY 'New password';

   Add port=6666 to / etc/my.cnf file to change the default port number of mysql from 3306 to 6666

   [root@VM_149_46_centos ~]# vim /etc/my.cnf
   
   # For advice on how to change settings please see
   
   
   # http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html
   
   
   [mysqld]
   
   #
   
   # Remove leading # and set to the amount of RAM for the most important data
   
   
   # cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
   
   
   # innodb_buffer_pool_size = 128M
   
   #
   
   # Remove leading # to turn on a very important data integrity option: logging
   
   
   # changes to the binary log between backups.
   
   
   # log_bin
   
   #
   
   # Remove leading # to set options mainly useful for reporting servers.
   
   
   # The server defaults are faster for transactions and fast SELECTs.
   
   
   # Adjust sizes as needed, experiment to find the optimal values.
   
   
   # join_buffer_size = 128M
   
   
   # sort_buffer_size = 2M
   
   
   # read_rnd_buffer_size = 2M
   
   datadir=/var/lib/mysql
   socket=/var/lib/mysql/mysql.sock
   
   
   # Disabling symbolic-links is recommended to prevent assorted security risks
   
   symbolic-links=0
   
   log-error=/var/log/mysqld.log
   pid-file=/var/run/mysqld/mysqld.pid
   
   port=6666

6. Login test

    [root@VM_149_46_centos ~]# mysql -u root -p

   Sign in with the new password, no problem

7. complete

Reference link
http://blog.csdn.net/holmofy/article/details/69364800
http://www.linuxidc.com/Linux/2016-09/134940.htm
https://dev.mysql.com/doc/refman/5.6/en/alter-user.html
https://zhidao.baidu.com/question/1704383715138160380.html