Hope you are doing well,
You have not updated the /etc/hosts file in the CentOS
1) First of all type the command to get the ip address
ifconfig
For eg - > Ipaddress of my vm is 192.168.1.144
2) Now Login as root
su
4) Open /etc/hosts file using
gedit /etc/hosts
and add two lines given below
127.0.0.1 localhost.localdomain localhost
192.168.1.144 localhost.localdomain localhost
I think this will resolve the query