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Auto Scaling
User Guide

Troubleshooting Auto Scaling

Amazon Web Services provides specific and descriptive errors to help you troubleshoot Auto Scaling problems. You can find the error messages in the description of the Auto Scaling activities.

Retrieving an Error Message

To retrieve an error message from the description of Auto Scaling activities, use the describe-scaling-activities command as follows:

Copy
aws autoscaling describe-scaling-activities --auto-scaling-group-name my-asg

The following is an example response, where StatusCode contains the current status of the activity and StatusMessage contains the error message:

{
    "Activities": [
        {
            "Description": "Launching a new EC2 instance: i-4ba0837f",
            "AutoScalingGroupName": "my-asg",
            "ActivityId": "f9f2d65b-f1f2-43e7-b46d-d86756459699",
            "Details": "{"Availability Zone":"us-west-2c"}",
            "StartTime": "2013-08-19T20:53:29.930Z",
            "Progress": 100,
            "EndTime": "2013-08-19T20:54:02Z",
            "Cause": "At 2013-08-19T20:53:25Z a user request created an AutoScalingGroup...",
            "StatusCode": "Failed",
            "StatusMessage": "The image id 'ami-4edb0327' does not exist. Launching EC2 instance failed."
        }
   ]
}

The following tables list the types of error messages and provide links to the troubleshooting resources that you can use to troubleshoot your Auto Scaling issues.