CentOS7 uses yum to install mysql 8.0.12

rpm -qa | grep mysql
#The possible display is as follows#mysql-community-libs-8.0.12-1.el7.x86_64
#mysql80-community-release-el7-1.noarch
#mysql-community-client-8.0.12-1.el7.x86_64
#mysql-community-common-8.0.12-1.el7.x86_64
#mysql-community-server-8.0.12-1.el7.x86_64
#Delete through the following command yum remove mysql-xxx-xxx-


#Find the relevant files of mysql find / -name mysql

#Delete the mysql configuration file information according to your needs rm -rf /var/lib/mysql

rpm -qa | grep mariadb
#Find mariadb
#Possible results mariadb-libs-5.5.56-2.el7.x86_64
#Forcefully delete the search results rpm -e --nodeps mariadb-libs-5.5.56-2.el7.x86_64

cd /usr/src
wget https://dev.mysql.com/get/mysql80-community-release-el7-1.noarch.rpm

#Install yum source yum localinstall mysql80-community-release-el7-1.noarch.rpm

#Update yum source yum clean all
yum makecache

#Start installing MySQL
yum install mysql-community-server

#Start MySQL
systemctl start mysqld

#After successful startup, you can view the randomly generated initialization password cat /var/log/mysqld.log | grep password

#Log in to MySQL and modify the mysql user password mysql -u root -p
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'yourpassword';
#Remotely set mysql> use mysql;
mysql> update user set host='%' where user='root';
#Authorize the user name's permissions and grant any host the permission to access data mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%'WITH GRANT OPTION;
mysql> FLUSH PRIVILEGES;

#Allow myuser to connect to the mysql server from any host using the mypassword password GRANT ALL PRIVILEGES ON *.* TO 'myuser'@'%'IDENTIFIED BY 'mypassword' WITH GRANT OPTION;
#Allow user myuser to connect to the MySQL server from the host with IP 192.168.1.6 and use mypassword as the password GRANT ALL PRIVILEGES ON *.* TO 'myuser'@'192.168.1.3'IDENTIFIED BY 'mypassword' WITH GRANT OPTION;

#Start mysql
systemctl start mysqld.service

#End systemctl stop mysqld.service

#Restart systemctl restart mysqld.service

#Start automatically at boot time systemctl enable mysqld.service

#Modify the encryption rules (I didn't write this line, but it seems to be OK) The password needs to be set to a format that contains uppercase and lowercase letters and numbers, otherwise the setting will not be successful ALTER USER 'root'@'%' IDENTIFIED BY 'password' PASSWORD EXPIRE NEVER; 
#Update the user's password ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY 'password'; 
#Flush permissions FLUSH PRIVILEGES;