There are multiple way to setup replication with MySQL 8.0 and our replication offer as never been so rich: asynchronous, semi-synchronous, group replication, multi-source, … and much more options !
But if you want to setup a very quick Master-Slave environment from scratch for a quick test (you can always use dbdeployer), here are some commands to make it right the first time 
Requirements
You need to have MySQL 8.0 installed and running on both servers and with the same initial data (a fresh install for example). Here we use mysql1 and mysql2. We will also use GTID as it’s much more convenient.
Servers Configuration
Let’s setup mysql1 first:
mysql1> SET PERSIST server_id=1; mysql1> SET PERSIST_ONLY gtid_mode=ON; mysql1> SET PERSIST_ONLY enforce_gtid_consistency=true; mysql1> RESTART;
And now mysql2:
mysql2> SET PERSIST server_id=2; mysql2> SET PERSIST_ONLY gtid_mode=ON; mysql2> SET PERSIST_ONLY enforce_gtid_consistency=true; mysql2> RESTART;
Replication User
On mysql1 that will act as master we do:
mysql1> CREATE USER 'repl'@'%' IDENTIFIED BY 'password' REQUIRE SSL; mysql1> GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%';
Starting the Slave
And on mysql2, we just configure and start replication:
mysql2> CHANGE MASTER TO MASTER_HOST='mysql1',
MASTER_PORT=3306, MASTER_USER='repl',
MASTER_PASSWORD='password', MASTER_AUTO_POSITION=1, MASTER_SSL=1;
mysql2> START SLAVE;
Done !
Very easy, and of course don’t forget to check the manual for much more options !
via Planet MySQL
Master-Slave Replication with MySQL 8.0 in 2 mins