Is it possible to get aws ec2 instance id based on its IP address

Question

I have list of IP addressed, I want to find if instances associated with the IP address are still running or terminated. I am launching and terminating lot of instances on daily basis, just want to remove their certificates from puppetmaster.

If there is any alternative method, I can achieve my goal, I can do that.

score 24 · Accepted Answer · answered Aug 05 '15 at 06:31

24

aws ec2 describe-instances --filter Name=ip-address,Values=IP_1,..IP_N

Should do what you need.

use the filter name of private-ip-address to select using private address in your VPC.

Pipe through something like

jq -r '.Reservations[].Instances[] | .InstanceId, .PublicIpAddress'

if you want the corresponding InstanceID

answered Aug 05 '15 at 06:31

Jamie W

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4

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You don't need to use `jq`, you can pass a `--query` option to extract parts of the output: `aws ec2 describe-instances --filter Name=ip-address,Values=IP_1,..IP_N --query 'Reservations[].Instances[].[InstanceId,PublicIpAddress]`See [Controlling Command Output from the AWS Command Line Interface](https://docs.aws.amazon.com/cli/latest/userguide/controlling-output.html) for more details. Note that `--query` uses [JMESPath](http://jmespath.org/), which is slightly different from `jq`. – markusk Sep 13 '18 at 08:52

score 10 · Answer 2 · answered Nov 05 '19 at 19:54

You can use --query and --output formats if you want to use this in a bash script.

aws ec2 describe-instances --filter Name=private-ip-address,Values=x.x.x.x --query 'Reservations[].Instances[].InstanceId' --output text

This will give you text response without json formatting

i-03c1ad0d6abe32323

score 1 · Answer 3 · answered Sep 13 '18 at 09:09

An alternative approach would be to use CloudWatch Events to listen for EC2 instances being terminated, and have the listener (which could be a Lambda function, or some custom service listening to SQS) remove the corresponding certificates from Puppet.

References:

score 0 · Answer 4 · answered Sep 23 '22 at 17:34

0

You can use grep

 aws ec2 describe-instances --filter Name=private-ip-address,Values=x.x.x.x | grep 'InstanceId'

Note: dont use InstanceId keyword in Tag or Name

answered Sep 23 '22 at 17:34

Chau Giang

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Is it possible to get aws ec2 instance id based on its IP address

4 Answers4