- [[AWS]] [[Amazon EC2]] - These logs can be useful in determining why certain instances have been terminated or why they have not been started. - The stack events will tell you how far AWS got in [[Autoscaling]] your [[EC2 Auto Scaling Groups (ASG)]]. Stack events are useful in cases where the ASG was never created or failed upon creation. - Pay attention to the different events being reported: - `AWS::CloudFormation::Stack` - `AWS::AutoScaling::AutoScalingGroup` - `AWS::EC2::SecurityGroup` - The log says whether each step is in progress or has been completed. - Here's an example of this log: - ```javascript ["2020-09-03 09:47:32 UTC CREATE_COMPLETE AWS::CloudFormation::Stack "," 2020-09-03 09:47:31 UTC CREATE_COMPLETE AWS::AutoScaling::AutoScalingGroup "," 2020-09-03 09:47:30 UTC CREATE_IN_PROGRESS AWS::AutoScaling::AutoScalingGroup Resource creation Initiated"," 2020-09-03 09:47:30 UTC CREATE_IN_PROGRESS AWS::AutoScaling::AutoScalingGroup "," 2020-09-03 09:47:28 UTC CREATE_COMPLETE AWS::AutoScaling::LaunchConfiguration "," 2020-09-03 09:47:28 UTC CREATE_IN_PROGRESS AWS::AutoScaling::LaunchConfiguration Resource creation Initiated"," 2020-09-03 09:47:27 UTC CREATE_IN_PROGRESS AWS::AutoScaling::LaunchConfiguration "," 2020-09-03 09:47:25 UTC CREATE_COMPLETE AWS::EC2::SecurityGroup "," 2020-09-03 09:47:25 UTC CREATE_IN_PROGRESS AWS::EC2::SecurityGroup Resource creation Initiated"," 2020-09-03 09:47:20 UTC CREATE_IN_PROGRESS AWS::EC2::SecurityGroup "," 2020-09-03 09:47:16 UTC CREATE_IN_PROGRESS AWS::CloudFormation::Stack User Initiated"]``` - [[AWS Service Quotas]] have been reached. - `UTC CREATE_FAILED AWS::AutoScaling::AutoScalingGroup You have requested more instances (3) than your current instance limit of 2 allows for the specified instance type. Please visit http://aws.amazon.com/contact-us/ec2-request to request an adjustment to this limit. Launching EC2 instance failed.` - Solution: Contact [[AWS]] and request an increase in quotas.