[SOLVED] Using AWS EC2 API (https) with EC2 Launch Templates - The parameter LaunchTemplate is not recognized

Issue

I am extremely new with APIs and can not figure this out.

I have a use case where I want to call the AWS EC2 Rest API over https to start an instance from a Launch Template. I am using "RunInstances" 1 to attempt this. I have scrolled through the document and included all of the required parameters.

I then added "ImageId" to the test and got a good run (no issues with authentication, etc). The default instance was created.

The issue is that I cannot figure out how to get the API to accept the "LaunchTemplate" option. I either get "The parameter LaunchTemplate is not recognized" or a "400 - bad request" error.

In postman I have: Postman Screenshot with the RunInstances call set up and the full URL visable

This is the link to the "LaunchTemplateSpecification" object documentation (linked from 1 also) 3

Can someone help me figure out how to construct the API request for the "LaunchTemplate" parameter?

Also, my web searches have not revealed HTTPS (web url) examples only CLI examples (none for this paramater in the docs either). If someone found a link that I could not, please send it my way.

Thanks!

Solution

@stdunbar was correct so far as the LaunchTemplate.LaunchTemplateName parameter was concerned.

I submitted a case to AWS support and received a response. I was missing a "version" parameter.

The correct parameter set is as follows:

https://us-east-1.ec2.amazonaws.com/?
   Action=RunInstances&
   MaxCount=1&
   MinCount=1&
   LaunchTemplate.LaunchTemplateName=Testing-Template&
   Version=2016-11-15

Here is an updated Image of Postman (for learners like me) 1

Answered By - LeviRCoding

Answer Checked By - Marie Seifert (WPSolving Admin)