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Anthony Kong
Asked: 2019-06-19 16:57:28 +0800 CST

How to find out an ec2 instance's private and public IP via aws cli?

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Answers I found so far (e.g. Find out public ip address of the EC2 server) suggest using wget or curl to reach the server.

They are not useful for me because my ec2 instances are not reachable from the internet directly.

I have tried

aws ec2 --profile prod describe-instances --filters Name=instance-id,Values=i-00914683ababcba7eb1

But there are no IPs in the returned JSON result.

Which aws CLI command I can use to retrieve this info?

amazon-ec2

2 Answers

  1. Best Answer

    Generally you can do it with --query filter.

    If you need the private IP address only:

    aws --region YOUR-AWS-REGION \
ec2 describe-instances \
--filters \
"Name=instance-state-name,Values=running" \
"Name=instance-id,Values=i-00914683ababcba7eb1" \
--query 'Reservations[*].Instances[*].[PrivateIpAddress]' \
--output text

    If you need the public ip address only:

    aws --region YOUR-AWS-REGION \
ec2 describe-instances \
--filters \
"Name=instance-state-name,Values=running" \
"Name=instance-id,Values=i-00914683ababcba7eb1" \
--query 'Reservations[*].Instances[*].[PublicIpAddress]' \
--output text

    Or you can have both:

    aws --region YOUR-AWS-REGION \
ec2 describe-instances \
--filters \
"Name=instance-state-name,Values=running" \
"Name=instance-id,Values=i-00914683ababcba7eb1" \
--query 'Reservations[*].Instances[*].[PrivateIpAddress, PublicIpAddress]' \
--output text

    Of course you can have the output in json format too. Just change --output text to --output json

    More information about --query filters.

    • 22

  2. It turns out I can do this

    aws ec2 --profile prod describe-instances \
--filters Name=instance-id,Values=i-0f47d09e1d9659981 \
| jq ".Reservations[0].Instances[0].NetworkInterfaces[0].PrivateIpAddress"

    and it will return

    10.0.9.7

    My command in the question failed because, coincidentally, that instance was being shut down. So there was no NetworkInterfaces section in the result.

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