Only the NAT instance should reference the AmazonProvidedDNS, all other instances should use the NAT instance for DNS (which will forward non-internal DNS requests to the AmazonProvidedDNS).
Linux appears to use nameservers in order whereas Windows would suddenly switch to using the different name server which could returned a previously used DNS address and confuse running clients even if the client connected to the server via IP address (how the C# driver discovers the replica-set so ends up connecting via hostname).
Need to make sure that NAT instance can resolve names during init for it to install updates, packages etc...
Only the NAT instance should reference the AmazonProvidedDNS, all other instances should use the NAT instance for DNS (which will forward non-internal DNS requests to the AmazonProvidedDNS).
Linux appears to use nameservers in order whereas Windows would suddenly switch to using the different name server which could returned a previously used DNS address and confuse running clients even if the client connected to the server via IP address (how the C# driver discovers the replica-set so ends up connecting via hostname).
Need to make sure that NAT instance can resolve names during init for it to install updates, packages etc...