How to print the output of each EC2 instance of a run command executed through SSM automation document

Question

I am trying to print the output of multiple EC2 instances executed via AWS-RunPowerShellScript document through AWS SSM Automationin Automation execution step outputs section. However, it seems to be not working. Can anyone help me with correct syntax for the same. Please find the below code:

description: printssmruncommandoutput
schemaVersion: '0.3'
mainsteps:
  -name:printssmoutput
   action:'aws:runcommand'
   onfailure:Abort
   inputs:
     DocumentName:AWS-RunPowerShellScript
     Targets:
       -Key: ec2key
        Values:
          - ec2instance
     Parameters:
       Commands:
         - 'hostname'
         - 'Write-Host "this is the test server"'
   outputs:
     - Name: DesiredOutput
       Selector: $.OutputPayload
       Type: String

outputs:
 - DesiredOutput.OutputPayload.CommandId
 - DesiredOutput.OutputPayload.Status

It seems like not working. In the outputs section of SSM Automation execution, I am seeing this error even after successful execution of SSM automation document step: "No output available yet because the step is not successfully executed"

Answer 1

I had the same question and finally figured it out. I have not been able to access OutputPayload as a JSON object but you can access the four items it contains: Status, ResponseCode, Output, and CommandId.

description: PrintSSMRunCommandOutput
schemaVersion: "0.3"
mainSteps:
  - name: PrintSSMOutput
    action: aws:runCommand
    onFailure: Abort
    inputs:
      DocumentName: AWS-RunPowerShellScript
      Targets:
        - Key: tag:ec2key
          Values:
            - ec2instance
      Parameters:
        commands:
          - hostname
          - Write-Host "this is the test server"
    outputs:
      - Name: OutputStatus
        Selector: $.Status
        Type: String
      - Name: OutputResponseCode
        Selector: $.ResponseCode
        Type: Integer
      - Name: OutputOutput
        Selector: $.Output
        Type: String
      - Name: OutputCommandId
        Selector: $.CommandId
        Type: String
outputs:
  - PrintSSMOutput.OutputStatus
  - PrintSSMOutput.OutputResponseCode
  - PrintSSMOutput.OutputOutput
  - PrintSSMOutput.OutputCommandId