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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