Amazon Linux - Configure Network Settings

When running Amazon Linux on AWS, you can find the networking configuration file at:

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

If you edit it, you will likely find content similar to the following:

DEVICE=eth0
BOOTPROTO=dhcp
ONBOOT=yes
TYPE=Ethernet
USERCTL=yes
PEERDNS=yes
IPV6INIT=no
PERSISTENT_DHCLIENT=yes
RES_OPTIONS="timeout:2 attempts:5"
DHCP_ARP_CHECK=no
MTU="9001"

Set Google DNS

One can manually set the DNS provider, by adding the following lines:

DNS1=8.8.8.8
DNS2=8.8.4.4

In this example, we have set the DNS to Google's DNS servers, but you can set any IP addresses you like, such as OpenDNS.

Run the following command for the changes to take immediate effect.

sudo ifdown eth0 && sudo ifup eth0

References

• AWS Docs - My private Amazon EC2 instance is running Amazon Linux, Ubuntu, or RHEL. How do I assign a static DNS server to the EC2 instance that persists during reboot?