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t reveals that public resolvers dominate the internet, accounting for nearly 60% of recursive DNS usage. Telecom giants represent nearly 9%, with Google the clear front-runner at a little over 30%, followed by Amazon Web Services at 16%. The report also highlights the declining usage of EDNS Client Subnet (ECS), the slow adoption of IPv6 and DNSSEC, and the emergence of HTTPS records as a solution to the “CNAME-at-apex” challenge.
Several DNS-related programs want to automatically manage the DNS name server and resolution configuration file at /etc/resolv.conf. In some situations, you may want to manage this file yourself. Here is how you identify which programs are automatically managing this file on your Linux distribution, and how you can take back manual control of the file.
There are quite a few different tools that fight to control a Linux system’s DNS resolution configuration file /etc/resolv.conf including netconfig, NetworkManager, resolvconf, rdnssd, and systemd-resolved.