A replication user is necessary to set up the relationship
Replica. This is a short step
but it needs a bit more of attention.
From the MySQL 5.7 documentation (highlights are my own):
Although you do not have to create an account specifically for replication, you should be aware that the replication user name and password are stored in plain text in the master info repository file or table (see Section 220.127.116.11, “Slave Status Logs”). Therefore, you may want to create a separate account that has privileges only for the replication process, to minimize the possibility of compromise to other accounts.
The following command specifically will allow replication from all databases and tables connecting from all hosts. For security reasons you may want to limit access to replication only to the IP address of the server doing the …[Read more]