rpm -Uvh http://yum.postgresql.org/9.4/redhat/rhel-7-x86_64/pgdg-centos94-9.4-3.noarch.rpm

yum install postgresql94-server postgresql94-contrib

/usr/pgsql-9.4/bin/postgresql94-setup initdb

systemctl enable postgresql-9.4.service
systemctl start postgresql-9.4.service
systemctl status postgresql-9.4.service

firewall-cmd --permanent --add-port=5432/tcp
firewall-cmd --permanent --add-port=80/tcp
firewall-cmd --reload

查找安装目录
find / -name postgresql.conf