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Send CloudWatch Alarms to Slack with AWS Lambda
Michael Wittig – 01 Nov 2017
As we all know, things go wrong. That’s why monitoring and alerting are essential topics. Wouldn’t it be nice, if problems in your AWS account would show up in Slack? So you can react quickly while using your favorite messaging tool. In this blog post, you will learn how you can turn CloudWatch Alarms into Slack messages like this:
How it works
On AWS, everything sends monitoring data (CPU utilization, estimated monthly charges, …) to CloudWatch. In CloudWatch, you define alarms to send a message to an SNS topic if the monitoring data gets out of normal bounds. Finally, you connect a Lambda function to the SNS topic to trigger a function execution. The Lambda function calls the Slack API to send a message. The following figure shows the data flow:
You will use Node.js to implement the Lambda function. To send a request to the Slack API, you have to make an HTTPS request. The request module is easy to use, but I wanted a variant of the module that returns promises to avoid callback hell. That’s why I used request-promise-native. The Slack webhook URL is passed in as an environment variable that you define later in the CloudFormation template.
Create a S3 bucket for SAM (replace $UniqueSuffix with e.g. your username): aws --region us-east-1 s3 mb s3://cw-to-slack-$UniqueSuffix
Install Node.js dependencies: npm install
Package the Lambda function code (replace $UniqueSuffix with e.g. your username): aws --region us-east-1 cloudformation package --s3-bucket cw-to-slack-$UniqueSuffix --template-file template.yml --output-template-file template.sam.yml
Deploy the CloudFormation stack (replace $WebhookURL with your URL from Slack): aws --region us-east-1 cloudformation deploy --parameter-overrides "WebhookURL=$WebhookURL" --template-file template.sam.yml --stack-name cw-to-slack --capabilities CAPABILITY_IAM
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