Download rpm package and configure yum repository

 wget https://dev.mysql.com/get/mysql80-community-release-el8-1.noarch.rpm
sudo yum localinstall mysql80-community-release-el8-1.noarch.rpm
sudo yum repolist enabled | grep "mysql.*-community.*"

output:
mysql-connectors-community              MySQL Connectors Community
mysql-tools-community                   MySQL Tools Community
mysql80-community                       MySQL 8.0 Community Server
sudo yum repolist all | grep mysql

Disable mysql5.7:

sudo yum-config-manager --disable mysql57-community

Enable mysql8.0:

sudo yum-config-manager --enable mysql80-community

Verify:

sudo yum repolist enabled | grep mysql

Disabling default mysql modules

sudo yum module disable mysql

Installation

sudo yum install mysql-community-server

Service start stop

start:

sudo service mysqld start

status check:

sudo service mysqld status

Changing temp password after installation

sudo grep 'temporary password' /var/log/mysqld.log

output:
2020-09-19T16:33:12.280169Z 6 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: .Z#5m,9wsmlw

Above output will print default password .Z#5m,9wsmlw in the console.

Changing password by following below setup command

sudo mysql_secure_installation

Interactive setup:

Securing the MySQL server deployment.

Enter password for user root: Enter New Root Password

VALIDATE PASSWORD PLUGIN can be used to test passwords
and improve security. It checks the strength of password
and allows the users to set only those passwords which are
secure enough. Would you like to setup VALIDATE PASSWORD plugin?

Press y|Y for Yes, any other key for No: y

There are three levels of password validation policy:

LOW    Length >= 8
MEDIUM Length >= 8, numeric, mixed case, and special characters
STRONG Length >= 8, numeric, mixed case, special characters and dictionary                  file

Please enter 0 = LOW, 1 = MEDIUM and 2 = STRONG: 2
Using existing password for root.

Estimated strength of the password: 50 
Change the password for root ? ((Press y|Y for Yes, any other key for No) : y

New password: Set New MySQL Password

Re-enter new password: Re-enter New MySQL Password

Estimated strength of the password: 100 
Do you wish to continue with the password provided?(Press y|Y for Yes, any other key for No) : y
By default, a MySQL installation has an anonymous user,
allowing anyone to log into MySQL without having to have
a user account created for them. This is intended only for
testing, and to make the installation go a bit smoother.
You should remove them before moving into a production
environment.

Remove anonymous users? (Press y|Y for Yes, any other key for No) : y
Success.


Normally, root should only be allowed to connect from
'localhost'. This ensures that someone cannot guess at
the root password from the network.

Disallow root login remotely? (Press y|Y for Yes, any other key for No) : y
Success.

By default, MySQL comes with a database named 'test' that
anyone can access. This is also intended only for testing,
and should be removed before moving into a production
environment.

Remove test database and access to it? (Press y|Y for Yes, any other key for No) : y
 - Dropping test database...
Success.

 - Removing privileges on test database...
Success.

Reloading the privilege tables will ensure that all changes
made so far will take effect immediately.

Reload privilege tables now? (Press y|Y for Yes, any other key for No) : y
Success.

All done! 

Connecting to MySQL server

mysql -u root -p