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Reliable and fast DNS resolution is essential for running any networked device. Web servers are no exclusion.
How servers benefit from fast DNS?
Improving the DNS resolution speed, will also improve all the server functions which use DNS. This applies to:
- Websites using external APIs
- Synchronizing time
- Any other features requiring DNS resolution. One example would be nginx web server using DNS resolution for its SSL stapling feature
Enable CloudFlare 184.108.40.206 DNS resolution in CentOS 7
Since CentOS 7 uses NetworkManager by default, we can easily enable the great new 220.127.116.11 DNS service by CloudFlare with a few commands only.
We assume that your main network interface is
eth0. Let’s start with making sure that the DNS servers sent by DHCP are not used:
nmcli connection modify eth0 ipv4.ignore-auto-dns yes
Now, adjust configuration profile to use CloudFlare fast DNS servers. For IPv4, run:
nmcli connection modify eth0 ipv4.dns 18.104.22.168,22.214.171.124
And for IPv6, you may want to additionally run:
nmcli connection modify eth0 ipv6.dns 2606:4700:4700::1111,2606:4700:4700::1001
Now we have configured our network settings, but they are not yet live. Let’s bring up the use of CloudFlare DNS nameservers:
nmcli connection up eth0
Wasn’t that easy? Now your server uses the fastest DNS nameservers. And if you don’t trust my word, you can use dnsperftest from our repository to confirm.