Question

我已经配置了Elastic Load Balancer端口和SSL证书等，并且路由53设置为将我的站点的流量路由到它。

我想知道是否有一个示例cloudFormation模板可以创建一个ec2实例的自动扩展组，其中每个实例都添加到现有负载均衡器中或从中删除。

我在网上浏览了一些例子 - 下面的例子几乎就是我所需要的，但是它的问题（以及所有其他看起来使用这种变体的人）都假定你想要创建一个新的负载均衡器。我没有。

https://s3.amazonaws.com/cloudformation-templates-us-east-1/AutoScalingMultiAZWithNotifications.template

是否有可能做我的建议？有人有例子吗？

我的CloudFormation脚本如下所示（我删除了实际的服务器包配置部分）。这成功创建了一个新实例，但它没有添加到负载均衡器“load4”。我可以手动将主机添加到负载均衡器，但这显然违背了目的。

{
"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 >=0"
},

"MaxInstances" : {
  "Description" : "The maximum number of Workers",
  "Type" : "Number",
  "MinValue" : "1",
  "Default"  : "4",
  "ConstraintDescription" : "Enter a number >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 > 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 < 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"
    }
  }
}

}

Answer 1

参数LoadBalancerNames仅表示与此自动缩放组关联的负载均衡器列表。您引用的示例AWS CloudFormation模板（以及我所知道的所有其他示例）都将此配置为LoadBalancer资源的结果，如下所示：

"LoadBalancerNames": [
    {
        "Ref": "ElasticLoadBalancer"
    }
],

Ref函数的结果在LoadBalancer底部的返回值部分中定义：

当此资源的逻辑ID提供给Ref内在时函数，它返回资源名称。例如， mystack-myelb-1WQN7BJGDB5YQ。

这只是AWS Management Console中显示的负载均衡器名称，因此您可以直接提供其名称来使用在CloudFormation外部创建的任何Elastic Load Balancer，例如：< / p>

"LoadBalancerNames": [ "existing-load-balancer-1" ],

Answer 2

你无法解耦这两者。我已经通过亚马逊支持验证了一个不相关的用例。很糟糕。

以下是我们的讨论。 https://forums.aws.amazon.com/thread.jspa?messageID=362467&#362467亚马逊最后没有回复他们的说法，我们不支持。

更新我的答案不再正确。亚马逊已添加此功能。见其他讨论。

Answer 3

我可以确认以下工作，当添加到“Type”资源的配置时：“AWS :: AutoScaling :: AutoScalingGroup”：

"LoadBalancerNames" : [ "YourELBNameHere" ]

或者，如果您将名称作为参数，

"LoadBalancerNames" : [ {"Ref" : "YourELBParameterNameHere"} ]

ASG创建的实例将添加到/注册到ELB，如果终止堆栈，则会自动删除/注销。

创建自动扩展webserver组添加到现有elb

3 个答案: