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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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
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:
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