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POCreate autoscaling webserver group add to existing elb
 

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    <p>I have an Elastic Load Balancer already configured with ports and SSL certificates etc and Route 53 is set to route traffic for my site to it. </p> <p>I'd like to know if there is an example cloudFormation template that creates an auto-scaling group of ec2 instances where each instance is added and removed to/from this existing load balancer.</p> <p>I've looked around online for examples - the one below seems to be nearly what I need, but the problem with it (and all the others which appear to use variations of this) is that it presumes you want to create a NEW load balancer. I do not.</p> <p><a href="https://s3.amazonaws.com/cloudformation-templates-us-east-1/AutoScalingMultiAZWithNotifications.template" rel="nofollow">https://s3.amazonaws.com/cloudformation-templates-us-east-1/AutoScalingMultiAZWithNotifications.template</a></p> <p>Is it possible, to do what I'm suggesting? Does someone have an example?</p> <p>My CloudFormation script looks like below ( I removed the actual server package config part). This successfully creates a new instance, but it does not add to load balancer "load4". I can add the host to the load balancer manually, but this defeats the purpose obviously.</p> <pre><code>{ "AWSTemplateFormatVersion" : "2010-09-09", "Description" : "Create an Auto-scaling group that will attach to existing load balancer and inhereit existing security groups.", "Parameters" : { "KeyName" : { "Description" : "mykeyname", "Type" : "String" }, "InstanceType" : { "Type" : "String", "Default" : "m1.small", "AllowedValues" : [ "m1.small", "m1.medium", "m1.large", "m1.xlarge", "m2.xlarge", "m2.2xlarge", "m2.4xlarge", "c1.xlarge", "cc1.4xlarge" ], "Description" : "EC2 instance type (e.g. m1.large, m1.xlarge, m2.xlarge)" }, "SpotPrice": { "Description": "Spot price for application AutoScaling Group", "Type": "Number", "MinValue" : ".03" }, "MinInstances" : { "Description" : "The minimum number of Workers", "Type" : "Number", "MinValue" : "0", "Default" : "0", "ConstraintDescription" : "Enter a number &gt;=0" }, "MaxInstances" : { "Description" : "The maximum number of Workers", "Type" : "Number", "MinValue" : "1", "Default" : "4", "ConstraintDescription" : "Enter a number &gt;1" }, "OperatorEmail": { "Description": "Email address to notify if there are any scaling operations", "Type": "String" } }, "Mappings" : { "AWSInstanceType2Arch" : { "t1.micro" : { "Arch" : "64" }, "m1.small" : { "Arch" : "64" }, "m1.medium" : { "Arch" : "64" }, "m1.large" : { "Arch" : "64" }, "m1.xlarge" : { "Arch" : "64" }, "m2.xlarge" : { "Arch" : "64" }, "m2.2xlarge" : { "Arch" : "64" }, "m2.4xlarge" : { "Arch" : "64" }, "m3.xlarge" : { "Arch" : "64" }, "m3.2xlarge" : { "Arch" : "64" }, "c1.medium" : { "Arch" : "64" }, "c1.xlarge" : { "Arch" : "64" }, "cc1.4xlarge" : { "Arch" : "64HVM" }, "cc2.8xlarge" : { "Arch" : "64HVM" }, "cg1.4xlarge" : { "Arch" : "64HVM" } }, "AWSRegionArch2AMI" : { "us-east-1" : { "32" : "ami-31814f58", "64" : "ami-1b814f72", "64HVM" : "ami-0da96764" }, "us-west-2" : { "32" : "ami-38fe7308", "64" : "ami-30fe7300", "64HVM" : "NOT_YET_SUPPORTED" }, "us-west-1" : { "32" : "ami-11d68a54", "64" : "ami-1bd68a5e", "64HVM" : "NOT_YET_SUPPORTED" }, "eu-west-1" : { "32" : "ami-973b06e3", "64" : "ami-953b06e1", "64HVM" : "NOT_YET_SUPPORTED" }, "ap-southeast-1" : { "32" : "ami-b4b0cae6", "64" : "ami-beb0caec", "64HVM" : "NOT_YET_SUPPORTED" }, "ap-southeast-2" : { "32" : "ami-b3990e89", "64" : "ami-bd990e87", "64HVM" : "NOT_YET_SUPPORTED" }, "ap-northeast-1" : { "32" : "ami-0644f007", "64" : "ami-0a44f00b", "64HVM" : "NOT_YET_SUPPORTED" }, "sa-east-1" : { "32" : "ami-3e3be423", "64" : "ami-3c3be421", "64HVM" : "NOT_YET_SUPPORTED" } } }, "Resources" : { "NotificationTopic": { "Type": "AWS::SNS::Topic", "Properties": { "Subscription": [ { "Endpoint": { "Ref": "OperatorEmail" }, "Protocol": "email" } ] } }, "WebServerGroup" : { "Type" : "AWS::AutoScaling::AutoScalingGroup", "Properties" : { "AvailabilityZones" : { "Fn::GetAZs" : ""}, "LaunchConfigurationName" : { "Ref" : "LaunchConfig" }, "MinSize" : "0", "MaxSize" : "4", "LoadBalancerNames" : [ "load4" ], "NotificationConfiguration" : { "TopicARN" : { "Ref" : "NotificationTopic" }, "NotificationTypes" : [ "autoscaling:EC2_INSTANCE_LAUNCH","autoscaling:EC2_INSTANCE_LAUNCH_ERROR","autoscaling:EC2_INSTANCE_TERMINATE", "autoscaling:EC2_INSTANCE_TERMINATE_ERROR"] } } }, "CfnUser" : { "Type" : "AWS::IAM::User", "Properties" : { "Path": "/", "Policies": [ { "PolicyName": "root", "PolicyDocument": { "Statement": [ { "Effect":"Allow", "Action":"cloudformation:DescribeStackResource", "Resource":"*" } ] } } ] } }, "HostKeys" : { "Type" : "AWS::IAM::AccessKey", "Properties" : { "UserName" : { "Ref" : "CfnUser" } } }, "LaunchConfig" : { "Type" : "AWS::AutoScaling::LaunchConfiguration", "Metadata" : { "Comment" : "Create a single webserver", "AWS::CloudFormation::Init" : { "config" : { "packages" : { "yum" : { } }, "files" : { } } } }, "Properties" : { "KeyName" : { "Ref" : "KeyName" }, "SpotPrice" : { "Ref" : "SpotPrice" }, "ImageId" : { "Fn::FindInMap" : [ "AWSRegionArch2AMI", { "Ref" : "AWS::Region" }, { "Fn::FindInMap" : [ "AWSInstanceType2Arch", { "Ref" : "InstanceType" }, "Arch" ] } ] }, "SecurityGroups" : [ "webserver" ], "InstanceType" : { "Ref" : "InstanceType" }, "UserData" : { "Fn::Base64" : { "Fn::Join" : ["", [ "#!/bin/bash\n", "yum update -y aws-cfn-bootstrap\n", "# Install the Worker application\n", "/opt/aws/bin/cfn-init ", " --stack ", { "Ref" : "AWS::StackId" }, " --resource LaunchConfig ", " --configset ALL", " --region ", { "Ref" : "AWS::Region" }, "\n" ]]}} } }, "WorkerGroup" : { "Type" : "AWS::AutoScaling::AutoScalingGroup", "Properties" : { "AvailabilityZones" : { "Fn::GetAZs" : ""}, "LaunchConfigurationName" : { "Ref" : "LaunchConfig" }, "MinSize" : { "Ref" : "MinInstances" }, "MaxSize" : { "Ref" : "MaxInstances" } } }, "WebServerScaleUpPolicy" : { "Type" : "AWS::AutoScaling::ScalingPolicy", "Properties" : { "AdjustmentType" : "ChangeInCapacity", "AutoScalingGroupName" : { "Ref" : "WorkerGroup" }, "Cooldown" : "60", "ScalingAdjustment" : "1" } }, "WebServerScaleDownPolicy" : { "Type" : "AWS::AutoScaling::ScalingPolicy", "Properties" : { "AdjustmentType" : "ChangeInCapacity", "AutoScalingGroupName" : { "Ref" : "WorkerGroup" }, "Cooldown" : "60", "ScalingAdjustment" : "-1" } }, ... "WorkerThreadHigh": { "Type": "AWS::CloudWatch::Alarm", "Properties": { "AlarmDescription": "Scale-up if Worker Thread Vs. Idle Percent &gt; 80% for 10min", "MetricName": "PctActiveWorkers", "Namespace": "EC2", "Statistic": "Average", "Period": "300", "EvaluationPeriods": "2", "Threshold": "80", "AlarmActions": [ { "Ref": "WebServerScaleUpPolicy" } ], "Dimensions": [ { "Name": "AutoScalingGroupName", "Value": { "Ref": "WebServerGroup" } } ], "ComparisonOperator": "GreaterThanThreshold" } }, "WorkerThreadLow": { "Type": "AWS::CloudWatch::Alarm", "Properties": { "AlarmDescription": "Scale-down if CPU &lt; 50% for 10 minutes", "MetricName": "PctActiveWorkers", "Namespace": "EC2", "Statistic": "Average", "Period": "300", "EvaluationPeriods": "2", "Threshold": "50", "AlarmActions": [ { "Ref": "WebServerScaleDownPolicy" } ], "Dimensions": [ { "Name": "AutoScalingGroupName", "Value": { "Ref": "WebServerGroup" } } ], "ComparisonOperator": "LessThanThreshold" } } } } </code></pre>
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