How to wait for the IP when hiting Curl Command

Question

I am hitting an API using Curl command which create an EC2 instance in AWS and return the private IP of EC2 instance.

newrigprivateip=$(curl -X POST -H "Content-Type:application/json" -d "'{AMI_ID:'ami-9xxxxxx'}'" $posturl)
echo $newrigprivateip > $build

Now sometimes my private IP takes time to generate and because of that my script failed. Can we write the curl command in such a way that it will wait for the EC2 instance to up and wait until the private IP return.

You can try retry mechanism for curl. https://stackoverflow.com/questions/42873285/curl-retry-mechanism — Siva Srinivasa Rao M, Jul 26 '21 at 14:48
Does the API not provide some identifier that lets you query the instance later to get the necessary information? — chepner, Jul 26 '21 at 21:34
@chepner - it just provide private ip of ec2 instance apart from that nothing. — Jagjeet, Jul 27 '21 at 05:11

score -1 · Answer 1 · answered Jul 26 '21 at 14:49

-1

You can try retry mechanism for curl. Curl retry mechanism

This might help you out.

answered Jul 26 '21 at 14:49

Siva Srinivasa Rao M

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Thank you for your comment. But curl retry will create n number of EC2 instance on AWS – Jagjeet Jul 26 '21 at 15:51
In that case, you need to use a loop and sleep until it retrieves the ip. You can add a timeout just incase if the VM doesn’t come up. – Siva Srinivasa Rao M Jul 27 '21 at 16:44
I don't have great knowledge about linux shell scripting. Can you give an example, how can we use loop and wait for the ip address to return ? – Jagjeet Jul 27 '21 at 17:43

How to wait for the IP when hiting Curl Command

1 Answers1