Find ec2 instance using public dns name

[nitrocode]

Problem

In AWS emr, we get the public dns name and frequently need to get the instance id to get the private dns. We do this by searching for the public dns directly in the aws console > ec2 page.

I could not find a way to get the instance id from a public dns record using bma. The list of items that the bma instances command searches

https://github.com/bash-my-aws/bash-my-aws/blob/12109ec65a5c76d8242fd4839c7d89e3b3bfd9d5/lib/instance-functions#L30-L39

does not have the NetworkInterfaces[0].PrivateIpAddresses[0].Association.PublicDnsName key so it does not find the records when using

instances ec2-snip.us-east-1.compute.amazonaws.com

Proposed solution

I propose a bma dns-instance command that would do exactly this.

Or would it be better to add the NetworkInterfaces[0].PrivateIpAddresses[0].Association.PublicDnsName key to the bma instances command ?

Related

PR #299