Memory utilization for auto-scaling groups --AWS

Question

While i was setting up AWS autoscaling group, and scaling policy i ran into this problem.

I wanted to use memory as a parameter, so i installed CLoudwatch's script for memory monitoring from below link.

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/mon-scripts.html

When i use it for simple instance it works fine, but when i do it for auto-scaling with below command as given  in above doc i am getting an error.

Command

./mon-put-instance-data.pl --mem-util --mem-used --mem-avail --auto-scaling=only

Error:

WARNING: The Auto Scaling metrics will not be reported this time.

Any help is appreciated.

Answer 1

This is a working solution if your instance belongs to Autoscaling group.

rm -rf /var/tmp/aws-mon/

Then run,

./mon-put-instance-data.pl --mem-util --auto-scaling=only

When the monitoring script runs it caches the instance_id under /var/tmp/aws-mon.
One of the filters it uses when getting the auto scaling group name is the instance id. The TTL on this is 6 hours, so if your AMI has this cache, the query will use the wrong instance id for up to 6 hours after the instance is created which results in it failing to retrieve the auto scaling group name.

REF: https://forums.aws.amazon.com/thread.jspa?threadID=117783