CREATE ROLE replication_user_name WITH REPLICATION LOGIN PASSWORD 'password';

host replication replication_user_name ip_mask md5

sudo rm /var/lib/postgresql/12/main/*

sudo -u postgres pg_basebackup -h db_host -p port -U replication_user_name -D /var/lib/postgresql/12/main -Fp -Xs -P

primary_conninfo = 'host=db_host port=port user=replication_user_name password=replication_user_password'