Official website version 5.7: https://cdn.mysql.com//Downloads/MySQL-5.7/mysql-5.7.29-1.el7.x86_64.rpm-bundle.tar
can be uploaded to Linux using xftp.
Create mysql installation directory
mkdir mysql
In order to avoid permission problems, give the maximum permission to the directory where the mysql unzip file is located
chmod -R 777 mysql
Use the tar command to unzip
tar -xvf mysql-5.7.29-1.el7.x86_64.rpm-bundle.tar
Before installing the new version of mysql, you need to uninstall the mariadb-lib that comes with the system
rpm -qa|grep mariadb
rpm -e --nodeps mariadb-libs-5.5.60-1.el7_5.x86_64
Install in strict order: mysql-community-common-5.7.29-1.el7.x86_64.rpm, mysql-community-libs-5.7.29-1.el7.x86_64.rpm, mysql-community-client-5.7.29 -1.el7.x86_64.rpm, mysql-community-server-5.7.29-1.el7.x86_64.rpm these four packages
rpm -ivh mysql-community-common-5.7.29-1.el7.x86_64.rpm
rpm -ivh mysql-community-libs-5.7.29-1.el7.x86_64.rpm
rpm -ivh mysql-community-client-5.7.29-1.el7.x86_64.rpm
rpm -ivh mysql-community-server-5.7.29-1.el7.x86_64.rpm
If this error occurs during the installation process, add --force --nodeps at the end, which may be caused by yum installing an old version of GPG keys
rpm -ivh mysql-community-server-5.7.29-1.el7.x86_64.rpm --force --nodeps
Modify related configuration
vim /etc/my.cnf
Add these three lines
skip-grant-tables: skip login verification
character_set_server=utf8: set the default character set UTF-8
init_connect='SET NAMES utf8': set the default character set UTF-8
skip-grant-tables
character_set_server=utf8
init_connect='SET NAMES utf8'
Set boot up
systemctl start mysqld.service
Start mysql
mysql -uroot
Set a simple password first
update mysql.user set authentication_string=password('123456') where user='root';
Effective immediately
flush privileges;
Exit mysql and stop mysql service
退出命令 quit
停止mysql
systemctl stop mysqld.service
Edit my.cnf configuration file to comment out the line skip-grant-tables
Restart the mysql service
systemctl start mysqld.service
Log in to mysql again
mysql -uroot -p123456
Enable remote access
grant all privileges on *.* to 'root'@'%' identified by '123456' with grant option;
This error was reported as a result:
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before
Using mysql 5.7, you need to modify the initial password in time, otherwise you will get an error in everything. 
If you want to set a simple test password, for example, set it to 123456, this error will be prompted. An error means that your password does not meet the requirements.
mysql> alter user 'root'@'localhost' identified by '123456';
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
This is actually related to the value of validate_password_policy.
The validate_password_policy has the following values: the
default is 1, which is MEDIUM, so the password set at the beginning must meet the length, and must contain numbers, lowercase or uppercase letters, and special characters.
Sometimes, just for my own testing, I don't want to set the password so complicated. For example, I just want to set the root password to 123456.
Two global parameters must be modified:
First, modify the value of the validate_password_policy parameter
mysql> set global validate_password_policy=0;
Query OK, 0 rows affected (0.00 sec)
The validate_password_length (password length) parameter defaults to 8, we modify it to 1
mysql> set global validate_password_length=1;
Query OK, 0 rows affected (0.00 sec)
After completion, execute the modify password statement again to succeed
mysql> alter user 'root'@'localhost' identified by '123456';
Query OK, 0 rows affected (0.00 sec)
Settings take effect immediately
flush privileges;
Then set the remote access permission setting successfully
mysql> grant all privileges on *.* to 'root'@'%' identified by '123456' with grant option;
Query OK, 0 rows affected, 1 warning (0.00 sec)