EC2實例上的靜態頁面未在CloudFormation中的負載均衡器后面提供

Question

我很難進行故障排除，為什么不能通過負載均衡器為EC2實例上托管的靜態頁面提供服務。

我確定EC2實例配置正確，原因是：-當關聯的安全組中允許入站ICMP時，我可以ping實例-將實例的公共名稱添加到“輸出”部分時，我可以瀏覽網頁（盡管我可以不想直接執行此操作，因為該實例應該位於負載平衡器的后面）。

因此，我認為安全組和/或網絡路由存在問題。

這是CloudFormation模板的簡化版本（假定在eu-west-1 ）：

AWSTemplateFormatVersion: 2010-09-09
Resources:
  VPC:
    Type: 'AWS::EC2::VPC'
    Properties:
      CidrBlock: 10.0.0.0/16
      InstanceTenancy: default
      EnableDnsSupport: 'true'
      EnableDnsHostnames: 'true'

  IGW:
    Type: 'AWS::EC2::InternetGateway'

  IGWAttachment:
    Type: 'AWS::EC2::VPCGatewayAttachment'
    Properties:
      VpcId: !Ref VPC
      InternetGatewayId: !Ref IGW

  PublicSubnet:
    Type: 'AWS::EC2::Subnet'
    Properties:
      CidrBlock: 10.0.0.0/24
      AvailabilityZone: eu-west-1a
      MapPublicIpOnLaunch: 'True'
      VpcId: !Ref VPC

  App:
    Type: 'AWS::EC2::Instance'
    Properties:
      DisableApiTermination: 'false'
      InstanceInitiatedShutdownBehavior: stop
      ImageId: ami-70edb016
      InstanceType: t2.micro
      Monitoring: 'false'
      UserData: >-
        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
      NetworkInterfaces:
        - AssociatePublicIpAddress: 'true'
          DeleteOnTermination: 'true'
          Description: Primary network interface
          DeviceIndex: 0
          SubnetId: !Ref PublicSubnet
          GroupSet:
            - !Ref SGApp

  ELB:
    Type: 'AWS::ElasticLoadBalancing::LoadBalancer'
    Properties:
      Subnets:
        - !Ref PublicSubnet
      Instances:
        - !Ref App
      SecurityGroups:
        - !Ref SGELB
      Listeners:
        - LoadBalancerPort: '80'
          InstancePort: '80'
          Protocol: HTTP
      HealthCheck:
        Target: 'HTTP:80/'
        HealthyThreshold: '3'
        UnhealthyThreshold: '5'
        Interval: '15'
        Timeout: '5'

  SGELB:
    Type: 'AWS::EC2::SecurityGroup'
    Properties:
      VpcId: !Ref VPC

  AllowInboundHTTPToELB:
    Type: 'AWS::EC2::SecurityGroupIngress'
    Properties:
      GroupId: !Ref SGELB
      IpProtocol: tcp
      FromPort: '80'
      ToPort: '80'
      CidrIp: 0.0.0.0/0

  SGApp:
    Type: 'AWS::EC2::SecurityGroup'
    Properties:
      VpcId: !Ref VPC

  AllowInboundHTTPFromELB:
    Type: 'AWS::EC2::SecurityGroupIngress'
    Properties:
      GroupId: !Ref SGApp
      IpProtocol: tcp
      FromPort: '80'
      ToPort: '80'
      SourceSecurityGroupId: !Ref SGELB
  RouteTable:
    Type: 'AWS::EC2::RouteTable'
    Properties:
      VpcId: !Ref VPC

  PublicRoute:
    Type: 'AWS::EC2::Route'
    Properties:
      DestinationCidrBlock: 0.0.0.0/0
      RouteTableId: !Ref RouteTable
      GatewayId: !Ref IGW

  SubnetRouteTableAssociation:
    Type: 'AWS::EC2::SubnetRouteTableAssociation'
    Properties:
      RouteTableId: !Ref RouteTable
      SubnetId: !Ref PublicSubnet

Outputs:
  LoadBalancerDNSName:
    Value: !GetAtt ELB.DNSName

Answer 1

我解密了您的UserData ，發現您沒有index.html， HTTP:80/默認會查找index.html。 由於沒有index.html，因此httpd會重定向到帶有不unhealthy 302響應代碼的測試頁，正如您在注釋中提到的那樣，TCP：80可以工作或使用HTTP:80/demo.html

#!/bin/bash
yum update -y
yum install -y httpd24
service httpd start
chkconfig httpd on
groupadd www
usermod -a -G www ec2-user
chown -R root:www /var/www
chmod 2775 /var/www
find /var/www -type d -exec chmod 2775 {} +
find /var/www -type f -exec chmod 0664 {} +
echo '<html><head><title>Success!</title></head><body>Success!</body></html>' > /var/www/html/demo.html

Answer 2

一旦您的CF模板創建了資源，就去檢查負載均衡器控制台下ELB中EC2實例是否處於正常狀態。 如果不健康，則不會將流量路由到該站點。

EC2實例上的靜態頁面未在CloudFormation中的負載均衡器后面提供

問題描述

2 個解決方案

解決方案1
1 2018-05-24 16:44:57

解決方案2
1 已采納 2018-05-25 15:21:09

EC2實例上的靜態頁面未在CloudFormation中的負載均衡器后面提供

問題描述

2 個解決方案

解決方案1 1 2018-05-24 16:44:57

解決方案2 1 已采納 2018-05-25 15:21:09

解決方案1
1 2018-05-24 16:44:57

解決方案2
1 已采納 2018-05-25 15:21:09