Documentation: dhcp_options_set should explain how to maintain default AWS NS

[alex1x]

The documentation here doesn't mention anything about how to keep the default AWS NS: https://www.terraform.io/docs/providers/aws/r/vpc_dhcp_options.html

More specifically, when you set DHCP options, if you're not specifying external/own DNS NS, then you would (probably) want to default to the standard AWS NS. This should probably be the default behavior, but it isn't. What actually happens when you don't specify domain_name_servers is that resolution breaks (or rather you have to manually configure it to make it work by editing /etc/resolv.conf to point to default AWS NS or such). That's fine, but it should at least be mentioned in the docs.

For more on this: http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_DHCP_Options.html#AmazonDNS

I'll make a PR to include a note and warning about this behavior in the docs.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!