[ec2-user ~]$ sudo yum install -y https://download.postgresql.org/pub/repos/yum/10/redhat/rhel-7-x86_64/pgdg-redhat10-10-2.noarch.rpm
[ec2-user ~]$ sudo sed -i "s/rhel-$releasever-$basearch/rhel-latest-x86_64/g" "/etc/yum.repos.d/pgdg-10-redhat.repo"