CODEWITHSUNDEEP
amazon-web-servicesaws-cloudformation
Min
Min

Reputation: 538

Create Alarm in CloudFormation

I am having difficulty passing Load Balancer info when creating alarm in CloudFormation.

RequestCountHigh:
   Type: AWS::CloudWatch::Alarm
   Properties:
    AlarmDescription: Scale up 
    MetricName: RequestCount
    Namespace: AWS/ApplicationELB
    Statistic: Average
    Period: 300
    EvaluationPeriods: 1
    Threshold: 2
    AlarmActions: [!Ref ScaleUpPolicy]
    Dimensions:
      - Name: LoadBalancer 
        Value: !Ref WebAppALB    
    ComparisonOperator: GreaterThanThreshold

It is passing Load Balancer information in format: arn:aws:elasticloadbalancing:us-west-2:932921245520:loadbalancer/app/Appro-WebAp-1MH0X13S89TO8/b2f9795447cbxxxx

Instead of in format app/Appro-WebAp-1MH0X13S89TO8/b2f9795447cbxxxx

This causes Alarm to be in INSUFFICIENT state. Please advice.

Upvotes: 1

Views: 849

Answers (1)

lexicore
lexicore

Reputation: 43651

Assuming your WebAppALB is a AWS::ElasticLoadBalancingV2::LoadBalancer, !Ref WebAppALB returns the ARN of the load balancer.

You probably need !GetAtt WebAppALB.LoadBalancerFullName instead. Please check the documentation on return values of AWS::ElasticLoadBalancingV2::LoadBalancer.

Upvotes: 3

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