To install MySQL 8, you can use the standard yum installation:

[root@mysql-cluster-b ~]# yum install mysql-community-server
Loaded plugins: langpacks, ulninfo
Resolving Dependencies
--> Running transaction check
---> Package mysql-community-server.x86_64 0:8.0.37-1.el7 will be installed
--> Processing Dependency: mysql-community-client(x86-64) >= 8.0.11 for package: mysql-community-server-8.0.37-1.el7.x86_64
--> Running transaction check
---> Package mysql-community-client.x86_64 0:8.0.37-1.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

===========================================================================================================================================================================
 Package                                           Arch                              Version                                  Repository                              Size 
===========================================================================================================================================================================
Installing:
 mysql-community-server                            x86_64                            8.0.37-1.el7                             ol7_MySQL80                             65 M 
Installing for dependencies:
 mysql-community-client                            x86_64                            8.0.37-1.el7                             ol7_MySQL80                             16 M 

Transaction Summary
===========================================================================================================================================================================
Install  1 Package (+1 Dependent package)

Total download size: 81 M
Installed size: 375 M
Is this ok [y/d/N]: y
Downloading packages:
(1/2): mysql-community-client-8.0.37-1.el7.x86_64.rpm                                                                                               |  16 MB  00:00:00     
(2/2): mysql-community-server-8.0.37-1.el7.x86_64.rpm                                                                                               |  65 MB  00:00:00     
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total                                                                                                                                       86 MB/s |  81 MB  00:00:00     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : mysql-community-client-8.0.37-1.el7.x86_64                                                                                                              1/2 
  Installing : mysql-community-server-8.0.37-1.el7.x86_64                                                                                                              2/2 
  Verifying  : mysql-community-client-8.0.37-1.el7.x86_64                                                                                                              1/2 
  Verifying  : mysql-community-server-8.0.37-1.el7.x86_64                                                                                                              2/2 

Installed:
  mysql-community-server.x86_64 0:8.0.37-1.el7

Dependency Installed:
  mysql-community-client.x86_64 0:8.0.37-1.el7

Complete!

Once we have it installed we can start it as follows:

[root@mysql-cluster-b ~]# service mysqld start
Redirecting to /bin/systemctl start mysqld.service
[root@mysql-cluster-b ~]# temporal_password=`awk '/A temporary password is generated for/ {a=$0} END{ print a }' /var/log/mysqld.log | awk '{print $(NF)}'`
[root@mysql-cluster-b ~]#