Wanna know whether your ELB has at least one instance in service or not?
Just add a CloudWatch Alarm to your ELB and have it send status changes to SNS (from where you can route it to whatever notification system you’re using).
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{ "Parameters": { "AlarmSnsAccountId": { "Description": "Account ID of SNS topic to send Alarms to", "Type": "String" }, "AlarmSnsRegion": { "Description": "Region SNS topic to send Alarms to", "Type": "String" }, "AlarmSnsTopicName": { "Description": "Name of SNS topic to send Alarms to", "Type": "String" } }, "Resources": { "WebELB": { ... } "WebAutoScalingGroup": { ... }, "WebLaunchConfiguration": { ... }, "ELBHealthyHostCountAlarm": { "Properties": { "AlarmActions": [ { "Fn::Join": [ ":", [ "arn:aws:sns", { "Ref": "AlarmSnsRegion" }, { "Ref": "AlarmSnsAccountId" }, { "Ref": "AlarmSnsTopicName" } ] ] } ], "ComparisonOperator": "LessThanOrEqualToThreshold", "Dimensions": [ { "Name": "LoadBalancerName", "Value": { "Ref": "WebELB" } } ], "EvaluationPeriods": "3", "InsufficientDataActions": [ { "Fn::Join": [ ":", [ "arn:aws:sns", { "Ref": "AlarmSnsRegion" }, { "Ref": "AlarmSnsAccountId" }, { "Ref": "AlarmSnsTopicName" } ] ] } ], "MetricName": "HealthyHostCount", "Namespace": "AWS/ELB", "OKActions": [ { "Fn::Join": [ ":", [ "arn:aws:sns", { "Ref": "AlarmSnsRegion" }, { "Ref": "AlarmSnsAccountId" }, { "Ref": "AlarmSnsTopicName" } ] ] } ], "Period": "60", "Statistic": "Average", "Threshold": 0 }, "Type": "AWS::CloudWatch::Alarm" } } } |