scalable web server

webserver.yaml

AWSTemplateFormatVersion: 2010-09-09

Description: Sample Nginx scalable webserver

Parameters: 
  
  VpcCidrBlock:
      Description: VPC cidr block
      Type: String
      Default: 192.168.0.0/20

  InstanceType : 
      Description : WebServer EC2 instance type
      Type : String
      Default : t2.large
      AllowedValues :
      - t1.micro
      - t2.nano
      - t2.micro
      - t2.small 
      - t2.medium
      - t2.large
      - m1.small 
      - m1.medium 
      - m1.large 
      - m1.xlarge
      - m2.xlarge 
      - m2.2xlarge 
      - m2.4xlarge 
      - m3.medium
      - m3.large 
      - m3.xlarge 
      - m3.2xlarge 
      - m4.large
      - m4.xlarge 
      - m4.2xlarge 
      - m4.4xlarge
      - m4.10xlarge 
      - c1.medium 
      - c1.xlarge 
      - c3.large 
      - c3.xlarge 
      - c3.2xlarge
      - c3.4xlarge
      - c3.8xlarge
      - c4.large 
      - c4.xlarge
      - c4.2xlarge 
      - c4.4xlarge
      - c4.8xlarge  
      - g2.2xlarge
      - g2.8xlarge
      - r3.large
      - r3.xlarge 
      - r3.2xlarge
      - r3.4xlarge
      - r3.8xlarge
      - i2.xlarge
      - i2.2xlarge 
      - i2.4xlarge
      - i2.8xlarge
      - d2.xlarge
      - d2.2xlarge
      - d2.4xlarge 
      - d2.8xlarge 
      - hs1.8xlarge
      - cr1.8xlarge 
      - cc2.8xlarge
      ConstraintDescription : must be a valid EC2 instance type.
  
Mappings:  
  RegionMap: 
    us-east-1:
      HVM64: ami-047a51fa27710816e
    us-west-1:
      HVM64: ami-005c06c6de69aee84
    us-east-2:
      HVM64: ami-01aab85a5e4a5a0fe
    us-west-2:
      HVM64: ami-0e999cbd62129e3b1     

Resources:
#vpc
  SampleVPC:
          Type: AWS::EC2::VPC
          Properties:
            CidrBlock: !Ref VpcCidrBlock
            InstanceTenancy: default
            Tags:
            - Key: name
              Value: pipeline-factory
#public subnet
  SamplePublicSubnet1:
    Type: AWS::EC2::Subnet
    Properties:
      AvailabilityZone: 
        Fn::Select: 
          - 0
          - Fn::GetAZs: ""
      VpcId: !Ref SampleVPC
      CidrBlock: 192.168.0.0/24
      Tags:
      - Key: name
        Value: pipeline-factory

  SamplePublicSubnet2:
    Type: AWS::EC2::Subnet
    Properties:
      AvailabilityZone:
        Fn::Select: 
          - 1
          - Fn::GetAZs: ""
      VpcId: !Ref SampleVPC
      CidrBlock: 192.168.1.0/24
      Tags:
      - Key: name
        Value: pipeline-factory

#internet Gateway
  SampleInternetGateway:
    Type: AWS::EC2::InternetGateway
    Properties:
      Tags:
      - Key: name
        Value: pipeline-factory

#Internet Gateway attachement
  InternetGatewayAttachement:
        Type: AWS::EC2::VPCGatewayAttachment
        Properties: 
          InternetGatewayId: !Ref SampleInternetGateway
          VpcId: !Ref SampleVPC
    
#route table
  SampleRouteTable:
      Type: AWS::EC2::RouteTable
      Properties: 
        Tags: 
        - Key: name
          Value: pipeline-factory
        VpcId: !Ref SampleVPC

#subnet route table associations(public subnet)
  PBSubnet1RouteTableAssociation:
      Type: AWS::EC2::SubnetRouteTableAssociation
      Properties: 
          RouteTableId: !Ref SampleRouteTable
          SubnetId: !Ref SamplePublicSubnet1
  
  PBSubnet2RouteTableAssociation:
      Type: AWS::EC2::SubnetRouteTableAssociation
      Properties: 
          RouteTableId: !Ref SampleRouteTable
          SubnetId: !Ref SamplePublicSubnet2

#routes
     #internet gateway route
  SampleRoute:
      Type: AWS::EC2::Route
      Properties:
        GatewayId: !Ref SampleInternetGateway
        RouteTableId: !Ref SampleRouteTable
        DestinationCidrBlock: 0.0.0.0/0

#security group
  SampleSecurityGroup:
      Type: AWS::EC2::SecurityGroup
      Properties: 
        GroupDescription: Allow HTTP trafic
        SecurityGroupIngress: 
        - Description: Allow HTTP traffic from everywhere
          CidrIp: 0.0.0.0/0
          IpProtocol: tcp
          FromPort: 80
          ToPort: 80
        VpcId: !Ref SampleVPC

#auto scaling group
  WebServerAutoScalingGroup:
    Type: 'AWS::AutoScaling::AutoScalingGroup'
    Properties:
      AutoScalingGroupName: 'AutomationBoxes'
      VPCZoneIdentifier:
        - !Ref SamplePublicSubnet1  
        - !Ref SamplePublicSubnet2
      DesiredCapacity: '3'
      HealthCheckType: 'ELB'
      HealthCheckGracePeriod: 30 
      LaunchConfigurationName: !Ref WebServersLaunchConfiguration
      MaxSize: '3'
      MinSize: '3'
      TargetGroupARNs: 
      - !Ref MyApplicationLoadBalancerTargetGrp 

#load balancer target group 
  MyApplicationLoadBalancerTargetGrp:
    Type: AWS::ElasticLoadBalancingV2::TargetGroup
    Properties: 
      HealthCheckEnabled: true
      HealthCheckIntervalSeconds: 15
      HealthCheckPath: /index.html
      HealthCheckPort: traffic-port
      HealthCheckProtocol: HTTP
      HealthCheckTimeoutSeconds: 6
      HealthyThresholdCount: 5
      Name: MyalbTargetGroup
      Port: 80
      Protocol: HTTP
      Tags: 
        - Key: name
          Value: pipeline-factory
      TargetType: instance
      UnhealthyThresholdCount: 2
      VpcId: !Ref SampleVPC

#application load balancer
  MyAppLoadBalancer:
    Type: AWS::ElasticLoadBalancingV2::LoadBalancer
    Properties: 
      IpAddressType: ipv4
      Scheme: internet-facing
      SecurityGroups: 
        - !GetAtt SampleSecurityGroup.GroupId
      Subnets: 
      - !Ref SamplePublicSubnet1  
      - !Ref SamplePublicSubnet2
      Tags: 
        - Key: name
          Value: pipeline-factory
      Type: application

#load balancing listener
  MyAlbListener:
    Type: AWS::ElasticLoadBalancingV2::Listener
    Properties: 
      DefaultActions: 
      - TargetGroupArn: !Ref MyApplicationLoadBalancerTargetGrp
        Type: forward
      LoadBalancerArn: !Ref MyAppLoadBalancer
      Port: 80
      Protocol: HTTP

#auto scaling launch config
  WebServersLaunchConfiguration:
    Type: 'AWS::AutoScaling::LaunchConfiguration'
    Properties:
      ImageId: !FindInMap [RegionMap, !Ref "AWS::Region", HVM64]
      InstanceType: !Ref InstanceType
      #KeyName: dez.pem 
      LaunchConfigurationName: NginxWebServerLaunchConfig
      SecurityGroups:
        - !GetAtt SampleSecurityGroup.GroupId
      UserData: 
        Fn::Base64:
          Fn::Sub: |
            #!/bin/bash -xe

            yum install -y aws-cfn-bootstrap

            # Install the files and packages from the metadata
            /opt/aws/bin/cfn-init -v \
              --stack ${AWS::StackName} \
              --resource WebServersLaunchConfiguration \
              --configsets All \
              --region ${AWS::Region}

            # Signal the status from cfn-init
            /opt/aws/bin/cfn-signal -e $? \
              --stack ${AWS::StackName} \
              --resource WebServersLaunchConfiguration \
              --region ${AWS::Region}
    Metadata:
      'AWS::CloudFormation::Init':
        configSets:
          All:
            - ConfigureStelligentProject
        ConfigureStelligentProject:
          packages:
            yum:
              nginx: []
          files:
            /usr/share/nginx/html/index.html:
              content: '<p>Automation for the People</p>'
              mode: '000644'
              owner: root
              group: root
          services:
            sysvinit:
              nginx:
                enabled: 'true'
                ensureRunning: 'true'

Outputs:
  LoadBalancerDNSName:
     Description: load balancer DNS endpoint
     Value: !GetAtt MyAppLoadBalancer.DNSName