I. Edit /etc/hosts
# vi /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.99.5 ns1.bachem.local ns1
II. Install & Setting Bind chroot for DNS Server
-Install Bind
# yum -y install bind bind-chroot