postgresql centos 8 install code example

Example 1: install postgresql centos 5

# centos 5 32bit
rpm -Uvh http://yum.postgresql.org/9.1/redhat/rhel-5-i386/pgdg-centos91-9.1-4.noarch.rpm
yum install postgresql91-server
/etc/init.d/postgresql-9.1 initdb
service postgresql-9.1 start
chkconfig postgresql-9.1 on

Example 2: how to install postgresql on centos 7

...
[base]
name=CentOS-$releasever - Base
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

exclude=postgresql*

#released updates
[updates]
name=CentOS-$releasever - Updates
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
exclude=postgresql*
...