CloudFormation template for Slack alerts from CloudWatch alarms. Supports cluster, service, auto scaling and instance alarms.
To use this template, be sure to install Node.js and the AWK SDK. That done, cd to the repository root and run npm install.
Next, create an S3 bucket in your region and enter its name in .env.
Finally, build everything and sync the files to S3:
$ node_modules/gulp/bin/gulp.js build
The build task lints, validates and tests the inputs before syncing files to S3. Alternatively, you can call the lint, validate and test tasks individually before building and syncing.
To create a basic monitored stack, instantiate cfn/host-template.yml in the CloudFormation web console or at the command line.
$ aws cloudformation create-stack --stack-name alert-test-stack --template-body file://host-template.yml \
--parameters \
ParameterKey=AlertHookUrlBase64,ParameterValue=... \
ParameterKey=KeyName,ParameterValue=... \
ParameterKey=S3Bucket,ParameterValue=... \
ParameterKey=S3LambdaKey,ParameterValue=post-slack-alert-0.1.0.zip \
ParameterKey=S3TemplateKey,ParameterValue=alert-template.yml \
ParameterKey=Stage,ParameterValue=test \
--capabilities CAPABILITY_IAM
AlertHookUrlBase64 is the base64-encoded URL of the Slack webhook (including the leading https://). KeyName has to match an existing key pair (e.g. ssh-user). The parameter S3Bucket is the name of the bucket referenced in .env and used to sync templates and lambda to S3.
To add a nested alert stack to an existing template defining an ECS service, auto scaling group or EC2 instance, add the following parameters and resource:
Parameters:
Stage:
Description: Stage
Type: String
Default: "test"
AllowedPattern: "(test|prod)"
ConstraintDescription: set stage to `test` or `prod`
S3Bucket:
Description: Bucket holding template and lambda
Type: String
Default: "alert-template"
S3TemplateKey:
Description: Template key
Type: String
Default: alert-template.yml
S3LambdaKey:
Description: Lambda key
Type: String
Default: post-slack-alert-0.1.0.zip
AlertHookUrlBase64:
Description: Base64-encoded Slack hook URL
Type: String
Resources:
...
AlertStack:
Type: "AWS::CloudFormation::Stack"
Properties:
Parameters:
"Source": !Ref "Host"
"Stage": !Ref "Stage"
"EC2InstanceId": !Ref "logical name of EC2 instance..."
"S3Bucket": !Ref "S3Bucket"
"S3Key": !Ref "S3LambdaKey"
"SlackHookUrlBase64": !Ref "AlertHookUrlBase64"
TemplateURL: !Sub "https://s3-${AWS::Region}.amazonaws.com/${S3Bucket}/${S3TemplateKey}"
TimeoutInMinutes: 8
DependsOn: Host
Note that the S3 bucket must be local to the stack's AWS region.
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