amazon ec2 instance unable to resolve host

curl amazon-web-services amazon-ec2 host resolve
Benubird picture Benubird · Mar 24, 2014 · Viewed 13.9k times · Source

I have a bunch of amazon ec2 instances. Today, for no reason I can determine, three of them became unable to resolve a specific url. When I try curl <url>, those three instances say "curl: (6) Could not resolve host", while all the other instances are able to resolve the url and return the correct data. It's only that specific url, as well - all other urls work fine.

What could have caused this? I haven't changed anything on any of the instances, so it's not something I did. How do I find out why it happened?

Answer

Bertrand Marron picture Bertrand Marron · Jan 20, 2016

If you’re not using the default VPC, or a VPC created by the VPC wizard, you’ll need to make sure that the DNS hostname and DNS resolution options are enabled.

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