带有负载均衡器和 Auto Scaling Group 的 AWS CloudFormation 一直在加载网站

Question

我正在部署 AWS CloudFormation 模板。我正在部署一个指向 Auto Scaling 组的负载均衡器。我可以成功部署我的模板。但是当我使用 Load Balancer 的 DNS 访问该网站时，它一直在加载、加载和加载。

这是我的模板。

AWSTemplateFormatVersion: '2010-09-09'
Description: "Simple 3 tier web application template"
Parameters:
  KeyName:
    Default: 'MyanEatTesting2'
    Type: String
  VpcCidr:
    Default: '10.1.0.0/16'
    Type: String
    AllowedPattern: '(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/(\d{1,2})'
  InstanceType:
    Default: 't2.micro'
    Type: String
  SSHLocation:
    Description: The IP address range that can be used to SSH to the EC2 instances
    Type: String
    MinLength: '9'
    MaxLength: '18'
    Default: 0.0.0.0/0
    AllowedPattern: "(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/(\d{1,2})"
    ConstraintDescription: Must be a valid IP CIDR range of the form x.x.x.x/x
Mappings:
  AWSInstanceType2Arch:
    t1.micro:
      Arch: HVM64
    t2.nano:
      Arch: HVM64
    t2.micro:
      Arch: HVM64
    t2.small:
      Arch: HVM64
    t2.medium:
      Arch: HVM64
    t2.large:
      Arch: HVM64
    m1.small:
      Arch: HVM64
    m1.medium:
      Arch: HVM64
    m1.large:
      Arch: HVM64
    m1.xlarge:
      Arch: HVM64
    m2.xlarge:
      Arch: HVM64
    m2.2xlarge:
      Arch: HVM64
    m2.4xlarge:
      Arch: HVM64
    m3.medium:
      Arch: HVM64
    m3.large:
      Arch: HVM64
    m3.xlarge:
      Arch: HVM64
    m3.2xlarge:
      Arch: HVM64
    m4.large:
      Arch: HVM64
    m4.xlarge:
      Arch: HVM64
    m4.2xlarge:
      Arch: HVM64
    m4.4xlarge:
      Arch: HVM64
    m4.10xlarge:
      Arch: HVM64
    c1.medium:
      Arch: HVM64
    c1.xlarge:
      Arch: HVM64
    c3.large:
      Arch: HVM64
    c3.xlarge:
      Arch: HVM64
    c3.2xlarge:
      Arch: HVM64
    c3.4xlarge:
      Arch: HVM64
    c3.8xlarge:
      Arch: HVM64
    c4.large:
      Arch: HVM64
    c4.xlarge:
      Arch: HVM64
    c4.2xlarge:
      Arch: HVM64
    c4.4xlarge:
      Arch: HVM64
    c4.8xlarge:
      Arch: HVM64
    g2.2xlarge:
      Arch: HVMG2
    g2.8xlarge:
      Arch: HVMG2
    r3.large:
      Arch: HVM64
    r3.xlarge:
      Arch: HVM64
    r3.2xlarge:
      Arch: HVM64
    r3.4xlarge:
      Arch: HVM64
    r3.8xlarge:
      Arch: HVM64
    i2.xlarge:
      Arch: HVM64
    i2.2xlarge:
      Arch: HVM64
    i2.4xlarge:
      Arch: HVM64
    i2.8xlarge:
      Arch: HVM64
    d2.xlarge:
      Arch: HVM64
    d2.2xlarge:
      Arch: HVM64
    d2.4xlarge:
      Arch: HVM64
    d2.8xlarge:
      Arch: HVM64
    hi1.4xlarge:
      Arch: HVM64
    hs1.8xlarge:
      Arch: HVM64
    cr1.8xlarge:
      Arch: HVM64
    cc2.8xlarge:
      Arch: HVM64
  AWSRegionArch2AMI:
    us-east-1:
      HVM64: ami-0ff8a91507f77f867
      HVMG2: ami-0a584ac55a7631c0c
    us-west-2:
      HVM64: ami-a0cfeed8
      HVMG2: ami-0e09505bc235aa82d
    us-west-1:
      HVM64: ami-0bdb828fd58c52235
      HVMG2: ami-066ee5fd4a9ef77f1
    eu-west-1:
      HVM64: ami-047bb4163c506cd98
      HVMG2: ami-0a7c483d527806435
    eu-west-2:
      HVM64: ami-f976839e
      HVMG2: NOT_SUPPORTED
    eu-west-3:
      HVM64: ami-0ebc281c20e89ba4b
      HVMG2: NOT_SUPPORTED
    eu-central-1:
      HVM64: ami-0233214e13e500f77
      HVMG2: ami-06223d46a6d0661c7
    ap-northeast-1:
      HVM64: ami-06cd52961ce9f0d85
      HVMG2: ami-053cdd503598e4a9d
    ap-northeast-2:
      HVM64: ami-0a10b2721688ce9d2
      HVMG2: NOT_SUPPORTED
    ap-northeast-3:
      HVM64: ami-0d98120a9fb693f07
      HVMG2: NOT_SUPPORTED
    ap-southeast-1:
      HVM64: ami-08569b978cc4dfa10
      HVMG2: ami-0be9df32ae9f92309
    ap-southeast-2:
      HVM64: ami-09b42976632b27e9b
      HVMG2: ami-0a9ce9fecc3d1daf8
    ap-south-1:
      HVM64: ami-0912f71e06545ad88
      HVMG2: ami-097b15e89dbdcfcf4
    us-east-2:
      HVM64: ami-0b59bfac6be064b78
      HVMG2: NOT_SUPPORTED
    ca-central-1:
      HVM64: ami-0b18956f
      HVMG2: NOT_SUPPORTED
    sa-east-1:
      HVM64: ami-07b14488da8ea02a0
      HVMG2: NOT_SUPPORTED
    cn-north-1:
      HVM64: ami-0a4eaf6c4454eda75
      HVMG2: NOT_SUPPORTED
    cn-northwest-1:
      HVM64: ami-6b6a7d09
      HVMG2: NOT_SUPPORTED
Resources:
  Vpc:
    Type: AWS::EC2::VPC
    Properties:
      CidrBlock: !Ref VpcCidr
      EnableDnsHostnames: True
      EnableDnsSupport: True
  PublicSubnet1:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref Vpc
      CidrBlock: !Select [ 0, !Cidr [ !Ref VpcCidr, 12, 8 ] ]
      MapPublicIpOnLaunch: True
      AvailabilityZone: !Select
        - 0
        - Fn::GetAZs: !Ref AWS::Region
  PublicSubnet2:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref Vpc
      CidrBlock: !Select [ 1, !Cidr [ !Ref VpcCidr, 12, 8 ] ]
      MapPublicIpOnLaunch: True
      AvailabilityZone: !Select
        - 1
        - Fn::GetAZs: !Ref AWS::Region
  PublicSubnet3:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref Vpc
      CidrBlock: !Select [ 2, !Cidr [ !Ref VpcCidr, 12, 8 ] ]
      MapPublicIpOnLaunch: True
      AvailabilityZone: !Select
        - 2
        - Fn::GetAZs: !Ref AWS::Region
  DatabaseSubnet1:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref Vpc
      CidrBlock: !Select [ 3, !Cidr [ !Ref VpcCidr, 12, 8 ] ]
      AvailabilityZone: !Select
        - 0
        - Fn::GetAZs: !Ref AWS::Region
  DatabaseSubnet2:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref Vpc
      CidrBlock: !Select [ 4, !Cidr [ !Ref VpcCidr, 12, 8 ] ]
      AvailabilityZone: !Select
        - 1
        - Fn::GetAZs: !Ref AWS::Region
  MiddlewareSubnet1:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref Vpc
      CidrBlock: !Select [ 5, !Cidr [ !Ref VpcCidr, 12, 8 ] ]
      MapPublicIpOnLaunch: False
      AvailabilityZone: !Select
        - 0
        - Fn::GetAZs: !Ref AWS::Region
  MiddlewareSubnet2:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref Vpc
      CidrBlock: !Select [ 6, !Cidr [ !Ref VpcCidr, 12, 8 ] ]
      MapPublicIpOnLaunch: False
      AvailabilityZone: !Select
        - 1
        - Fn::GetAZs: !Ref AWS::Region
  MiddlewareSubnet3:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref Vpc
      CidrBlock: !Select [ 7, !Cidr [ !Ref VpcCidr, 12, 8 ] ]
      MapPublicIpOnLaunch: False
      AvailabilityZone: !Select
        - 2
        - Fn::GetAZs: !Ref AWS::Region
  InternetGateway:
    Type: AWS::EC2::InternetGateway
  AttachGateway:
    Type: AWS::EC2::VPCGatewayAttachment
    Properties:
      VpcId: !Ref Vpc
      InternetGatewayId: !Ref InternetGateway
  RouteTable:
    Type: AWS::EC2::RouteTable
    Properties:
      VpcId: !Ref Vpc
  Route:
    Type: AWS::EC2::Route
    DependsOn: InternetGateway
    Properties:
      RouteTableId: !Ref RouteTable
      DestinationCidrBlock: 0.0.0.0/0
      GatewayId: !Ref InternetGateway
  SubnetRouteTableAssociation1:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      SubnetId: !Ref PublicSubnet1
      RouteTableId: !Ref RouteTable
  SubnetRouteTableAssociation2:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      SubnetId: !Ref PublicSubnet2
      RouteTableId: !Ref RouteTable
  SubnetRouteTableAssociation3:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      SubnetId: !Ref PublicSubnet2
      RouteTableId: !Ref RouteTable
  AsgLaunchTemplate:
    Type: AWS::EC2::LaunchTemplate
    Properties:
      LaunchTemplateName: !Sub ${AWS::StackName}-launch-template
      LaunchTemplateData:
        CreditSpecification:
          CpuCredits: Unlimited
        ImageId:
          Fn::FindInMap:
            - AWSRegionArch2AMI
            - Ref: AWS::Region
            - Fn::FindInMap:
                - AWSInstanceType2Arch
                - Ref: InstanceType
                - Arch
        InstanceType: !Ref InstanceType
        KeyName: !Ref KeyName
        Monitoring:
          Enabled: True
        SecurityGroupIds:
          - !Ref WebServerSecurityGroup
        UserData:
          Fn::Base64: !Sub |
            #!/bin/bash -xe
            cd /tmp
            yum update -y
            yum install -y httpd24
            echo "Welcome from the instance" > /var/www/html/index.html
            sudo -u root service httpd start
  ApplicationAsg:
    Type: AWS::AutoScaling::AutoScalingGroup
    Properties:
      AutoScalingGroupName: ApplicationAsg
      MinSize: '1'
      MaxSize: '5'
      DesiredCapacity: '2'
      HealthCheckGracePeriod: 300
      LaunchTemplate:
        LaunchTemplateId: !Ref AsgLaunchTemplate
        Version: !GetAtt AsgLaunchTemplate.LatestVersionNumber
      VPCZoneIdentifier:
        - !Ref MiddlewareSubnet1
        - !Ref MiddlewareSubnet2
        - !Ref MiddlewareSubnet3
      LoadBalancerNames:
        - !Ref LoadBalancer
  WebServerSecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupDescription: Enable HTTP access via port 80
      SecurityGroupIngress:
        - IpProtocol: tcp
          FromPort: '80'
          ToPort: '80'
          CidrIp: 0.0.0.0/0
        - IpProtocol: tcp
          FromPort: '22'
          ToPort: '22'
          CidrIp:
            Ref: SSHLocation
      VpcId: !Ref Vpc
  LoadBalancer:
    Type: AWS::ElasticLoadBalancing::LoadBalancer
    Properties:
      Subnets:
        - !Ref PublicSubnet1
        - !Ref PublicSubnet2
        - !Ref PublicSubnet3
      CrossZone: 'true'
      Listeners:
        - LoadBalancerPort: '80'
          InstancePort: '80'
          Protocol: HTTP
      HealthCheck:
        Target: HTTP:80/
        HealthyThreshold: '3'
        UnhealthyThreshold: '5'
        Interval: '30'
        Timeout: '5'

我的模板中缺少什么，我该如何修复？

Answer 1

这最终归结为健康检查失败，因为您的主机上没有网络服务器运行。

主机在没有 NAT Gateway or NAT instance 的子网中是私有的。没有这个，他们就无法设置 apache 和服务流量。

要纠正此问题，请执行以下操作之一：

将 NAT 添加到私有实例子网的路由 table。
创建一个已包含您的配置的预烘焙 AMI，然后在您的启动配置中引用此 AMI。
将实例作为 public 启动（仅当上述两种情况都不适合您时）

Answer 2

我在我的沙盒帐户中启动了您的模板。

已部署，但由于缺少 AWS::EC2::NatGateway 和关联的 EIP、路由表，实例无法连接到互联网以下载 http24 在运行 UserData 成功。

我还修复了（或者可能改进了）您的UserData，缺少安全组，并添加了DependsOn 发送给您的 ASG。

您可以查看以下内容。我验证它在 us-east-1:

中有效

AWSTemplateFormatVersion: '2010-09-09'
Description: "Simple 3 tier web application template"
Parameters:
  KeyName:
    Default: 'MyanEatTesting2'
    Type: String
  VpcCidr:
    Default: '10.1.0.0/16'
    Type: String
    AllowedPattern: '(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/(\d{1,2})'
  InstanceType:
    Default: 't2.micro'
    Type: String
  SSHLocation:
    Description: The IP address range that can be used to SSH to the EC2 instances
    Type: String
    MinLength: '9'
    MaxLength: '18'
    Default: 0.0.0.0/0
    AllowedPattern: "(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/(\d{1,2})"
    ConstraintDescription: Must be a valid IP CIDR range of the form x.x.x.x/x
Mappings:
  AWSInstanceType2Arch:
    t1.micro:
      Arch: HVM64
    t2.nano:
      Arch: HVM64
    t2.micro:
      Arch: HVM64
    t2.small:
      Arch: HVM64
    t2.medium:
      Arch: HVM64
    t2.large:
      Arch: HVM64
    m1.small:
      Arch: HVM64
    m1.medium:
      Arch: HVM64
    m1.large:
      Arch: HVM64
    m1.xlarge:
      Arch: HVM64
    m2.xlarge:
      Arch: HVM64
    m2.2xlarge:
      Arch: HVM64
    m2.4xlarge:
      Arch: HVM64
    m3.medium:
      Arch: HVM64
    m3.large:
      Arch: HVM64
    m3.xlarge:
      Arch: HVM64
    m3.2xlarge:
      Arch: HVM64
    m4.large:
      Arch: HVM64
    m4.xlarge:
      Arch: HVM64
    m4.2xlarge:
      Arch: HVM64
    m4.4xlarge:
      Arch: HVM64
    m4.10xlarge:
      Arch: HVM64
    c1.medium:
      Arch: HVM64
    c1.xlarge:
      Arch: HVM64
    c3.large:
      Arch: HVM64
    c3.xlarge:
      Arch: HVM64
    c3.2xlarge:
      Arch: HVM64
    c3.4xlarge:
      Arch: HVM64
    c3.8xlarge:
      Arch: HVM64
    c4.large:
      Arch: HVM64
    c4.xlarge:
      Arch: HVM64
    c4.2xlarge:
      Arch: HVM64
    c4.4xlarge:
      Arch: HVM64
    c4.8xlarge:
      Arch: HVM64
    g2.2xlarge:
      Arch: HVMG2
    g2.8xlarge:
      Arch: HVMG2
    r3.large:
      Arch: HVM64
    r3.xlarge:
      Arch: HVM64
    r3.2xlarge:
      Arch: HVM64
    r3.4xlarge:
      Arch: HVM64
    r3.8xlarge:
      Arch: HVM64
    i2.xlarge:
      Arch: HVM64
    i2.2xlarge:
      Arch: HVM64
    i2.4xlarge:
      Arch: HVM64
    i2.8xlarge:
      Arch: HVM64
    d2.xlarge:
      Arch: HVM64
    d2.2xlarge:
      Arch: HVM64
    d2.4xlarge:
      Arch: HVM64
    d2.8xlarge:
      Arch: HVM64
    hi1.4xlarge:
      Arch: HVM64
    hs1.8xlarge:
      Arch: HVM64
    cr1.8xlarge:
      Arch: HVM64
    cc2.8xlarge:
      Arch: HVM64
  AWSRegionArch2AMI:
    us-east-1:
      HVM64: ami-0ff8a91507f77f867
      HVMG2: ami-0a584ac55a7631c0c
    us-west-2:
      HVM64: ami-a0cfeed8
      HVMG2: ami-0e09505bc235aa82d
    us-west-1:
      HVM64: ami-0bdb828fd58c52235
      HVMG2: ami-066ee5fd4a9ef77f1
    eu-west-1:
      HVM64: ami-047bb4163c506cd98
      HVMG2: ami-0a7c483d527806435
    eu-west-2:
      HVM64: ami-f976839e
      HVMG2: NOT_SUPPORTED
    eu-west-3:
      HVM64: ami-0ebc281c20e89ba4b
      HVMG2: NOT_SUPPORTED
    eu-central-1:
      HVM64: ami-0233214e13e500f77
      HVMG2: ami-06223d46a6d0661c7
    ap-northeast-1:
      HVM64: ami-06cd52961ce9f0d85
      HVMG2: ami-053cdd503598e4a9d
    ap-northeast-2:
      HVM64: ami-0a10b2721688ce9d2
      HVMG2: NOT_SUPPORTED
    ap-northeast-3:
      HVM64: ami-0d98120a9fb693f07
      HVMG2: NOT_SUPPORTED
    ap-southeast-1:
      HVM64: ami-08569b978cc4dfa10
      HVMG2: ami-0be9df32ae9f92309
    ap-southeast-2:
      HVM64: ami-09b42976632b27e9b
      HVMG2: ami-0a9ce9fecc3d1daf8
    ap-south-1:
      HVM64: ami-0912f71e06545ad88
      HVMG2: ami-097b15e89dbdcfcf4
    us-east-2:
      HVM64: ami-0b59bfac6be064b78
      HVMG2: NOT_SUPPORTED
    ca-central-1:
      HVM64: ami-0b18956f
      HVMG2: NOT_SUPPORTED
    sa-east-1:
      HVM64: ami-07b14488da8ea02a0
      HVMG2: NOT_SUPPORTED
    cn-north-1:
      HVM64: ami-0a4eaf6c4454eda75
      HVMG2: NOT_SUPPORTED
    cn-northwest-1:
      HVM64: ami-6b6a7d09
      HVMG2: NOT_SUPPORTED
Resources:
  Vpc:
    Type: AWS::EC2::VPC
    Properties:
      CidrBlock: !Ref VpcCidr
      EnableDnsHostnames: True
      EnableDnsSupport: True
  PublicSubnet1:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref Vpc
      CidrBlock: !Select [ 0, !Cidr [ !Ref VpcCidr, 12, 8 ] ]
      MapPublicIpOnLaunch: True
      AvailabilityZone: !Select
        - 0
        - Fn::GetAZs: !Ref AWS::Region
  PublicSubnet2:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref Vpc
      CidrBlock: !Select [ 1, !Cidr [ !Ref VpcCidr, 12, 8 ] ]
      MapPublicIpOnLaunch: True
      AvailabilityZone: !Select
        - 1
        - Fn::GetAZs: !Ref AWS::Region
  PublicSubnet3:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref Vpc
      CidrBlock: !Select [ 2, !Cidr [ !Ref VpcCidr, 12, 8 ] ]
      MapPublicIpOnLaunch: True
      AvailabilityZone: !Select
        - 2
        - Fn::GetAZs: !Ref AWS::Region
  DatabaseSubnet1:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref Vpc
      CidrBlock: !Select [ 3, !Cidr [ !Ref VpcCidr, 12, 8 ] ]
      AvailabilityZone: !Select
        - 0
        - Fn::GetAZs: !Ref AWS::Region
  DatabaseSubnet2:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref Vpc
      CidrBlock: !Select [ 4, !Cidr [ !Ref VpcCidr, 12, 8 ] ]
      AvailabilityZone: !Select
        - 1
        - Fn::GetAZs: !Ref AWS::Region
  MiddlewareSubnet1:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref Vpc
      CidrBlock: !Select [ 5, !Cidr [ !Ref VpcCidr, 12, 8 ] ]
      MapPublicIpOnLaunch: False
      AvailabilityZone: !Select
        - 0
        - Fn::GetAZs: !Ref AWS::Region
  MiddlewareSubnet2:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref Vpc
      CidrBlock: !Select [ 6, !Cidr [ !Ref VpcCidr, 12, 8 ] ]
      MapPublicIpOnLaunch: False
      AvailabilityZone: !Select
        - 1
        - Fn::GetAZs: !Ref AWS::Region
  MiddlewareSubnet3:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref Vpc
      CidrBlock: !Select [ 7, !Cidr [ !Ref VpcCidr, 12, 8 ] ]
      MapPublicIpOnLaunch: False
      AvailabilityZone: !Select
        - 2
        - Fn::GetAZs: !Ref AWS::Region
  InternetGateway:
    Type: AWS::EC2::InternetGateway
  AttachGateway:
    Type: AWS::EC2::VPCGatewayAttachment
    Properties:
      VpcId: !Ref Vpc
      InternetGatewayId: !Ref InternetGateway
  RouteTable:
    Type: AWS::EC2::RouteTable
    Properties:
      VpcId: !Ref Vpc
  Route:
    Type: AWS::EC2::Route
    DependsOn: InternetGateway
    Properties:
      RouteTableId: !Ref RouteTable
      DestinationCidrBlock: 0.0.0.0/0
      GatewayId: !Ref InternetGateway
  SubnetRouteTableAssociation1:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      SubnetId: !Ref PublicSubnet1
      RouteTableId: !Ref RouteTable
  SubnetRouteTableAssociation2:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      SubnetId: !Ref PublicSubnet2
      RouteTableId: !Ref RouteTable
  SubnetRouteTableAssociation3:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      SubnetId: !Ref PublicSubnet3
      RouteTableId: !Ref RouteTable
  AsgLaunchTemplate:
    Type: AWS::EC2::LaunchTemplate
    Properties:
      LaunchTemplateName: !Sub ${AWS::StackName}-launch-template
      LaunchTemplateData:
        CreditSpecification:
          CpuCredits: Unlimited
        ImageId:
          Fn::FindInMap:
            - AWSRegionArch2AMI
            - Ref: AWS::Region
            - Fn::FindInMap:
                - AWSInstanceType2Arch
                - Ref: InstanceType
                - Arch
        InstanceType: !Ref InstanceType
        KeyName: !Ref KeyName
        Monitoring:
          Enabled: True
        SecurityGroupIds:
          - !Ref WebServerSecurityGroup
        UserData:
          Fn::Base64: |
            #!/bin/bash -xe
   
            yum update -y
            yum install -y httpd24
            echo "Welcome from the instance $(hostname -f)" > /var/www/html/index.html
            service httpd start


  MyEIP:
    Type: AWS::EC2::EIP
    DependsOn: AttachGateway
    Properties: {}

  MyNAT:
    Type: AWS::EC2::NatGateway
    Properties: 
      AllocationId: !GetAtt MyEIP.AllocationId
      SubnetId: !Ref PublicSubnet1

  RouteToNat:
    Type: AWS::EC2::Route
    DependsOn: InternetGateway
    Properties:
      RouteTableId: !Ref PrivateRouteTable
      DestinationCidrBlock: 0.0.0.0/0
      NatGatewayId: !Ref MyNAT  

  PrivateRouteTable:
    Type: AWS::EC2::RouteTable
    Properties:
      VpcId: !Ref Vpc

  PrivateSubnetRouteTableAssociation1:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      SubnetId: !Ref MiddlewareSubnet1
      RouteTableId: !Ref PrivateRouteTable

  PrivateSubnetRouteTableAssociation2:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      SubnetId: !Ref MiddlewareSubnet2
      RouteTableId: !Ref PrivateRouteTable

  PrivateSubnetRouteTableAssociation3:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      SubnetId: !Ref MiddlewareSubnet3
      RouteTableId: !Ref PrivateRouteTable

  ELBWebServerSecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupDescription: Enable HTTP access via port 80
      SecurityGroupIngress:
        - IpProtocol: tcp
          FromPort: '80'
          ToPort: '80'
          CidrIp: 0.0.0.0/0
      VpcId: !Ref Vpc



  ApplicationAsg:
    Type: AWS::AutoScaling::AutoScalingGroup
    DependsOn: 
        - RouteToNat
        - PrivateSubnetRouteTableAssociation1
        - PrivateSubnetRouteTableAssociation2
        - PrivateSubnetRouteTableAssociation3
    Properties:
      AutoScalingGroupName: ApplicationAsg
      MinSize: '1'
      MaxSize: '5'
      DesiredCapacity: '2'
      HealthCheckGracePeriod: 300
      LaunchTemplate:
        LaunchTemplateId: !Ref AsgLaunchTemplate
        Version: !GetAtt AsgLaunchTemplate.LatestVersionNumber
      VPCZoneIdentifier:
        - !Ref MiddlewareSubnet1
        - !Ref MiddlewareSubnet2
        - !Ref MiddlewareSubnet3
      LoadBalancerNames:
        - !Ref LoadBalancer
  WebServerSecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupDescription: Enable HTTP access via port 80
      SecurityGroupIngress:
        - IpProtocol: tcp
          FromPort: '80'
          ToPort: '80'
          CidrIp: 0.0.0.0/0
        - IpProtocol: tcp
          FromPort: '22'
          ToPort: '22'
          CidrIp:
            Ref: SSHLocation
      VpcId: !Ref Vpc

  LoadBalancer:
    Type: AWS::ElasticLoadBalancing::LoadBalancer
    Properties:
      Subnets:
        - !Ref PublicSubnet1
        - !Ref PublicSubnet2
        - !Ref PublicSubnet3
      CrossZone: 'true'
      Listeners:
        - LoadBalancerPort: '80'
          InstancePort: '80'
          Protocol: HTTP
      HealthCheck:
        Target: HTTP:80/
        HealthyThreshold: '3'
        UnhealthyThreshold: '5'
        Interval: '30'
        Timeout: '5'
      SecurityGroups:
        - !Ref ELBWebServerSecurityGroup

带有负载均衡器和 Auto Scaling Group 的 AWS CloudFormation 一直在加载网站

AWS CloudFormation with Load Balancer and Auto Scaling Group is just keeping loading the website

amazon-web-services

amazon-elb

amazon-cloudformation

aws-auto-scaling