|Securing and Optimizing Linux: RedHat Edition -A Hands on Guide|
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The /etc/nsswitch.conf file is used to configure which services are to be used to determine information such as hostnames, password files, and group files. The last two ones, password files, and group files in our case are not used, since we don't use NIS services on our server. Thus, we will focus on the hosts line in this file.
Edit the nsswitch.conf file vi /etc/nsswitch.conf and change the hosts line to read:
"hosts: dns files"
Also, we would recommend deleting all instances of NIS services from each line of this file unless you are using NIS! The result should look like this:
passwd:files shadow:files group:files hosts:dns files bootparams:files ethers:files netmasks:files networks:files protocols:files rpc:files services:files automount:files aliases:files