Thursday, October 27, 2022

[SOLVED] How to get public dns name from aws ec2 describe-instances

Issue

I'm trying to make simple script which queries my ec2 instances and gets public dns name of instances which matches my filter. There is my first shot:

#!/bin/bash

aws ec2 describe-instances \
    --filters "Name=tag:app,Values=swarm-cluster" \
              "Name=tag:role,Values=manager" \
    --query "Reservations[*].Instances[*].PublicDnsName"

It almost works but I get something ugly:

[
    [
        ""
    ],
    [
        "ec2-xxx-xxx-xxx-xxx.venus-central-1.compute.amazonaws.com"
    ]
]

I want just list of FQDNs, one per line. How to format output? I know, I can do it with tr, sed and so on but I'd like use more sophisticated way. :)


Solution

You can just append --output text to your CLI call to get a text output.

Ref - https://docs.aws.amazon.com/cli/latest/userguide/cli-usage-output.html



Answered By - Michael Quale
Answer Checked By - Mary Flores (WPSolving Volunteer)
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