servers.yml

Description: >
    Mahmoud Sami / Udacity Project-2
    

Parameters:

    EnvironmentName:
        Description: An environment name that will be prefixed to resources
        Type: String

    InstanceType:
        Description: 
            "The EC2 instance type of general purpose"
        Type: String
        AllowedValues: [t3.nano, t3.micro, t3.small, t3.medium, t3.large, t3.xlarge, t3.2xlarge]

Resources:
    LoadBalancerSecGroup:
            Type: AWS::EC2::SecurityGroup
            Properties:
                GroupDescription: Allow http traffic to and from load balancer
                VpcId:
                    Fn::ImportValue:
                        !Sub "${EnvironmentName}-VPCID"
                SecurityGroupIngress:
                -   IpProtocol: tcp
                    FromPort: 80
                    ToPort: 80
                    CidrIp: 0.0.0.0/0
                SecurityGroupEgress:
                -   IpProtocol: tcp
                    FromPort: 80
                    ToPort: 80
                    CidrIp: 0.0.0.0/0

    WebServerSecGroup:
        Type: AWS::EC2::SecurityGroup
        Properties:
            GroupDescription: Allow http and ssh to our load balancer
            VpcId: 
                Fn::ImportValue:
                    !Sub "${EnvironmentName}-VPCID"
            SecurityGroupIngress:
            -   IpProtocol: tcp
                FromPort: 80
                ToPort: 80
                CidrIp: 0.0.0.0/0
            SecurityGroupEgress:
            -   IpProtocol: tcp
                FromPort: 0
                ToPort: 65535
                CidrIp: 0.0.0.0/0

    WebAppLaunchConfig:
        Type: AWS::AutoScaling::LaunchConfiguration
        Properties:
            UserData:
                Fn::Base64: !Sub |
                    #!/bin/bash
                    apt-get update -y
                    apt-get install unzip awscli -y
                    apt-get install apache2 -y
                    systemctl start apache2.service
                    cd /var/www/html
                    echo "it works! Udagram, Udacity" > index.html

            ImageId: ami-00ddb0e5626798373
            SecurityGroups:
            -   Ref: WebServerSecGroup
            InstanceType: !Ref 'InstanceType'
            BlockDeviceMappings:
            -   DeviceName: "/dev/sdk"
                Ebs:
                    VolumeSize: '10' #10GB

    WebAppGroup:
        Type: AWS::AutoScaling::AutoScalingGroup
        Properties:
            VPCZoneIdentifier:
            -   Fn::ImportValue:
                    !Sub "${EnvironmentName}-PRIV-NETS"
            LaunchConfigurationName:
                Ref: WebAppLaunchConfig
            MinSize: '4'
            MaxSize: '4'
            TargetGroupARNs:
            -   Ref: WebAppTargetGroup

    WebAppLB:
        Type: AWS::ElasticLoadBalancingV2::LoadBalancer
        Properties:
            SecurityGroups:
            -   Ref: LoadBalancerSecGroup
            Subnets:
            -   Fn::ImportValue: !Sub "${EnvironmentName}-PUB1-SN"
            -   Fn::ImportValue: !Sub "${EnvironmentName}-PUB2-SN"

    WebAppTargetGroup:
            Type: AWS::ElasticLoadBalancingV2::TargetGroup
            Properties:
                HealthCheckIntervalSeconds: 10
                HealthCheckPath: /
                HealthCheckProtocol: HTTP
                HealthCheckTimeoutSeconds: 8
                HealthyThresholdCount: 2
                Port: 80
                Protocol: HTTP
                UnhealthyThresholdCount: 5
                VpcId:
                    Fn::ImportValue:
                        Fn::Sub: "${EnvironmentName}-VPCID"
    Listener:
        Type: AWS::ElasticLoadBalancingV2::Listener
        Properties:
            DefaultActions:
            -   Type: forward
                TargetGroupArn:
                    Ref: WebAppTargetGroup
            LoadBalancerArn:
                Ref: WebAppLB
            Port: '80'
            Protocol: HTTP

    ALBListenerRule:
        Type: AWS::ElasticLoadBalancingV2::ListenerRule
        Properties:
            Actions:
            -   Type: forward
                TargetGroupArn: !Ref 'WebAppTargetGroup'
            Conditions:
            -   Field: path-pattern
                Values: [/]
            ListenerArn: !Ref 'Listener'
            Priority: 1

Outputs:
    WebAppLoadBalancerDNSName:
        Description: DNS name or Public URL of the Load Balancer
        Value: !Join [ "", [ 'http://', !GetAtt WebAppLB.DNSName ]]
        Export:
            Name: !Sub ${EnvironmentName}-LB-DNSName