Question

DNS and cloud init; where is the proper location to set the resolver

I’m running Centos 7. All the usual places to change the DNS resolver have a warning message that this file is created by cloudinit. So where do I actually set the resolver address? That is I need a file not created by cloudinit or any other automatic process.

The only reason I ask is in the last few days my reverse DNS check in Postfix has failed on some IP addresses that are fine, i.e. do have a reverse pointer. For example google gmail servers and comcast.

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My DO server Ubuntu 20 droplet install did not have resolvconf installed by default. So …

This link has a straight, DO specific answer, and it solved the same issue for me:

https://www.digitalocean.com/community/questions/how-to-permanently-change-dns-nameservers-in-ubuntu-18-04-3-wiki-article-is-not-working

Hi @gc948486cbc56b8,

If you wish to change your Resolv.conf you’ll need to edit your /etc/NetworkManager/NetworkManager.conf file. Open the file and search for the [main] section in this file. As soon as you find it, Add dns=none just after the [main] tag:

[main]
dns=none

Now that you are done with that part, update your /etc/resolv.conf to whatever you like and restart your NetworkManager.

sudo systemctl restart NetworkManager.service

And that’s it, your resolv.conf should now be safe.

Regards, KDSys