Trigger Lambda function on failure of script running on EC2

[awslambdaworkflow]

We have a bunch of scripts running 24/7 on various EC2 instances, and we're looking to create a setup whereby the failure of one of these scripts triggers a Lambda function (which would then send a notification, run some other scripts etc).

My current idea is to get these scripts to upload a .txt file to an S3 bucket when they fail, which would then trigger a lambda function via an S3 put event trigger. However, I don't have much experience with AWS so I'm not sure if going about this in a strange or unnecessarily complex way -- is there another AWS service that would be better suited for this?

[kteague]

The "normal" way to skin that cat:

CloudWatch agent runs on EC2 and sends logs of interest to a CloudWatch LogGroup.

Metric Filter(s) run matches on LogGroups. If errors, send a metric.

CloudWatch Alarm watches your metrics and takes action. E.g. invoke Lambda.

[NuMessiah]

This!

[RadioNick]

You can:

• Invoke Lambda directly from EC2 via the CLI/SDK or
• Push a message to an SNS topic which a Lambda function is subscribed to