There may be scenarios, when you need to use a custom DNS server for your Instances. So if you are deploying your application on an CentOS 7 on AWS, lets see how can set a custom DNS server such as 8.8.8.8 and 8.8.4.4

• Edit the following file,

vim /etc/sysconfig/network-scripts/ifcfg-eth0

• change the line PEERDNS="yes" to PEERDNS="no"
• Now, Edit the file /etc/sysconfig/network and add the DNS entries after the existing contents.

NETWORKING=yes
NOZEROCONF=yes
DNS1=8.8.8.8
DNS2=8.8.4.4

• Then, restart your network service

/etc/init.d/network  restart

• Now check and verify the DNS servers in /etc/resolv.conf

Jobin Joseph

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