rpm -ivh https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm

# PostgreSQL 11
yum -y install postgresql11-server postgresql11-contrib



# init db
/usr/pgsql-11/bin/postgresql-11-setup initdb


# enable / start 
systemctl enable postgresql-11
systemctl start postgresql-11