amazon-web-services - 创建自动缩放 Web 服务器组添加到现有 elb

Question

我的弹性负载均衡器已配置了端口和 SSL 证书等，并且 Route 53 设置为将我的站点流量路由到它。

我想知道是否有一个示例 cloudFormation 模板，它创建一个自动扩展的 ec2 实例组，其中每个实例都添加到现有的负载均衡器或从中删除。

我在网上查找了示例 - 下面的示例似乎几乎是我所需要的，但它的问题(以及所有其他似乎使用此变体的示例)是它假设您想要创建一个新的负载平衡器。我不知道。

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

是否可以按照我的建议进行操作？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，但这显然达不到目的。

{
"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仅表示与此自动扩展组关联的负载均衡器列表。 sample AWS CloudFormation您引用的模板(实际上是我知道的所有其他示例)已将此配置为 LoadBalancer 的结果资源如下:

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

Ref的结果函数在 LoadBalancer 底部的返回值部分定义:

When the logical ID of this resource is provided to the Ref intrinsic function, it returns the resource name. For example, mystack-myelb-1WQN7BJGDB5YQ.

这只是负载均衡器名称，如 AWS Management Console 中所示，因此您可以使用任何 Elastic Load Balancer通过直接提供其名称在 CloudFormation 外部创建，例如:

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