AWS-to-Slack

Forward AWS CloudWatch Alarms and other notifications from Amazon SNS to Slack.

CloudWatch Example	EB Event Example

What is it?

AWS-to-Slack is a Lambda function written in Node.js that forwards alarms and notifications to a dedicated Slack channel. It is self-hosted in your own AWS environment and doesn't have any 3rd party dependencies other than the Google Charts API for rendering CloudWatch metrics.

Supported AWS product notification formats:

• Auto-Scaling Events
• Batch Events
• CloudFormation
• CloudWatch Alarms (incl. Metrics!)
• CodeBuild
• CodeCommit
• CodeDeploy (via SNS/CloudWatch)
• CodePipeline (via SNS/CloudWatch)
• CodePipeline Manual Approval
• Elastic Beanstalk
• GuardDuty
• Health Dashboard
• Inspector
• RDS
• SES Received Notifications
• Generic SNS messages
• Plain text messages
• DevopsGuru 🆕
• X-Ray Insights 🆕

Additional formats will be added. Pull Requests are welcome!

Try!

Ready to try the latest version for yourself? Installation into your own AWS environment is simple:

1. Download this repo locally.

2. Use AWS Console's Create CloudFormation Stack tool.

   Upload cloudformation.yaml as your template.

3. Finish launching the Stack.

   For details on the parameter values, see Installation section.

4. Build / Update the code by running the following from the root of this project:

   AWS_REGION="<your_lambda_region>" LAMBDA_NAME="<your_lambda_name>" make deploy
   

   If you use AWS CLI profiles, simply add AWS_PROFILE to the make command like so:

   AWS_PROFILE="my-profile" AWS_REGION="<your_lambda_region>" LAMBDA_NAME="<your_lambda_name>" make deploy
   

Option 3: Use deploy target

See Managing Multiple Deployments for a .env file approach to creating or managing multiple stacks.

Installation

Step 1: Setup Slack

The Lambda function communicates with Slack through a Slack webhook webhook. Note that you can either create an app, or a custom integration > Incoming webhook (easier, will only let you add a webhook)

1. Navigate to https://my.slack.com/apps/manage and click "Add Configuration".
2. Choose the default channel where messages will be sent and click "Add Incoming WebHooks Integration".
3. Copy the webhook URL from the setup instructions and use it in the next section.
4. Click "Save Settings" at the bottom of the Slack integration page.

Step 2: Configure & Launch the CloudFormation Stack

Note that the AWS region will be the region from which you launch the CloudFormation wizard, which will also scope the resources (SNS, etc.) to that region.

Launch the CloudFormation Stack by using our preconfigured CloudFormation template and following the steps above.

Afterwards

Click "Next" and on the following page name your new stack and paste the webhook URL from before into the "HookUrl" field. You can also configure a different channel to post to if wanted.

Click "Next" again, complete the stack setup on the following pages and finally launch your stack.

Step 3: Subscribe to Triggers

Before the Lambda function will actually do anything you need to subscribe it to actual CloudWatch alarms and other SNS triggers. Open up the AWS Lambda, switch to the "Triggers" tab and subscribe for all events you're interested in.

Setting Up AWS CodeBuild

CodeBuild integration was suggested by ericcj and is based on the Medium post Monitor your AWS CodeBuilds via Lambda and Slack by Randy Findley.

To enable CodeBuild notifications add a new CloudWatch Event Rule, choose CodeBuild as source and CodeBuild Build State Change as type. As Target select the aws-to-slack Lambda. You can leave all other settings as is. Once your rule is created all CodeBuild build state events will be forwarded to your Slack channel.

Setting Up AWS CodeCommit

Similar to the CodeBuild integration, CodeCommit notifications are triggered by CloudWatch Event Rules. Create a new CloudWatch Event Rule, select CodeCommit as the source, and select one of the supported event types:

• CodeCommit Pull Request State Change - Will generate events when a pull request is opened, closed, merged, or updated.
• CodeCommit Repository State Change - Will generate events when a branch or tag reference is created, updated, or deleted.

Add the aws-to-slack lambda as the target. No other settings are needed.

Managing Multiple Deployments

You can save local .env files that contain your stack configurations for easier deployment and updates. Copy targets/example.env to a separate file and customize the parameters. Then deploy the file like this:

TARGET=targets/my-deploy.env make deploy

If you want to force-compile this project and push your code to a stack, use this:

TARGET=targets/my-deploy.env make package deploy

If you need to update your CloudFormation parameters, try this:

TARGET=targets/my-deploy.env make update-stack

Contributing

You want to contribute? That's awesome! 🎉

Check out our issues page for some ideas how to contribute and a list of open tasks. There're plenty of notification formats that still need to be supported.

The repository comes with a very simple Makefile to build the CloudFormation stack yourself.

make package

This generates a new release.zip in the root folder. Upload this zip to your AWS Lambda function and you're good to go. Make sure to check out Managing Multiple Deployments for a more scalable solution to deploys.