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servers.yml
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servers.yml
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Description: >
Oluwasegun Adesanya / Udagram Projects
Parameters:
EnvironmentName:
Description: An environment name that will be prefixed to resource names
Type: String
WebServerAMI:
Description: The machine image to be used for web servers.
Type: String
Default: ami-0e472ba40eb589f49
WebServerInstanceType:
Description: The web server EC2 instance type to be used.
Type: String
Default: t2.medium
Resources:
LBSecGroup:
Type: AWS::EC2::SecurityGroup
Properties:
GroupDescription: Allow http to our load balancer
VpcId:
Fn::ImportValue:
!Sub "${EnvironmentName}-VPCID"
SecurityGroupIngress:
- IpProtocol: tcp
FromPort: 80
ToPort: 80
CidrIp: 0.0.0.0/0
SecurityGroupEgress:
- IpProtocol: tcp
FromPort: 80
ToPort: 80
CidrIp: 0.0.0.0/0
WebServerSecGroup:
Type: AWS::EC2::SecurityGroup
Properties:
GroupDescription: Allow http to our hosts and SSH from local only
VpcId:
Fn::ImportValue:
!Sub "${EnvironmentName}-VPCID"
SecurityGroupIngress:
- IpProtocol: tcp
FromPort: 8080
ToPort: 8080
CidrIp: 0.0.0.0/0
- IpProtocol: tcp
FromPort: 22
ToPort: 22
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
sudo apt-get update -y
sudo apt-get install apache2 -y
sudo systemctl start apache2.service
ImageId: ami-0e472ba40eb589f49
SecurityGroups:
- Ref: WebServerSecGroup
InstanceType: t2.medium
BlockDeviceMappings:
- DeviceName: "/dev/sdk"
Ebs:
VolumeSize: '10'
WebAppGroup:
Type: AWS::AutoScaling::AutoScalingGroup
Properties:
VPCZoneIdentifier:
- Fn::ImportValue:
!Sub "${EnvironmentName}-PRIV-NETS"
LaunchConfigurationName:
Ref: WebAppLaunchConfig
MinSize: '4'
MaxSize: '6'
TargetGroupARNs:
- Ref: WebAppTargetGroup
WebAppLB:
Type: AWS::ElasticLoadBalancingV2::LoadBalancer
Properties:
Subnets:
- Fn::ImportValue: !Sub "${EnvironmentName}-PUB1-SN"
- Fn::ImportValue: !Sub "${EnvironmentName}-PUB2-SN"
SecurityGroups:
- Ref: LBSecGroup
Listener:
Type: AWS::ElasticLoadBalancingV2::Listener
Properties:
DefaultActions:
- Type: forward
TargetGroupArn:
Ref: WebAppTargetGroup
LoadBalancerArn:
Ref: WebAppLB
Port: '80'
Protocol: HTTP
ALBListenerRule:
Type: AWS::ElasticLoadBalancingV2::ListenerRule
Properties:
Actions:
- Type: forward
TargetGroupArn: !Ref 'WebAppTargetGroup'
Conditions:
- Field: path-pattern
Values: [/]
ListenerArn: !Ref 'Listener'
Priority: 1
WebAppTargetGroup:
Type: AWS::ElasticLoadBalancingV2::TargetGroup
Properties:
HealthCheckIntervalSeconds: 10
HealthCheckPath: /
HealthCheckProtocol: HTTP
HealthCheckTimeoutSeconds: 8
HealthyThresholdCount: 2
Port: 8080
Protocol: HTTP
UnhealthyThresholdCount: 5
VpcId:
Fn::ImportValue:
Fn::Sub: "${EnvironmentName}-VPCID"
WebServerScaleUpPolicy:
Type: AWS::AutoScaling::ScalingPolicy
Properties:
AdjustmentType: ChangeInCapacity
AutoScalingGroupName:
Ref: WebAppGroup
Cooldown: '60'
ScalingAdjustment: '1'
WebServerScaleDownPolicy:
Type: AWS::AutoScaling::ScalingPolicy
Properties:
AdjustmentType: ChangeInCapacity
AutoScalingGroupName:
Ref: WebAppGroup
Cooldown: '60'
ScalingAdjustment: "-1"
CPUAlarmHigh:
Type: AWS::CloudWatch::Alarm
Properties:
AlarmDescription: Scale-up if CPU > 90% for 10 minutes
MetricName: CPUUtilization
Namespace: AWS/EC2
Statistic: Average
Period: '300'
EvaluationPeriods: '2'
Threshold: '90'
AlarmActions:
- Ref: WebServerScaleUpPolicy
Dimensions:
- Name: AutoScalingGroupName
Value:
Ref: WebAppGroup
ComparisonOperator: GreaterThanThreshold
CPUAlarmLow:
Type: AWS::CloudWatch::Alarm
Properties:
AlarmDescription: Scale-down if CPU < 70% for 10 minutes
MetricName: CPUUtilization
Namespace: AWS/EC2
Statistic: Average
Period: '300'
EvaluationPeriods: '2'
Threshold: '70'
AlarmActions:
- Ref: WebServerScaleDownPolicy
Dimensions:
- Name: AutoScalingGroupName
Value:
Ref: WebAppGroup
ComparisonOperator: LessThanThreshold
UdagramS3ReadOnlyEC2:
Type: 'AWS::IAM::Role'
Properties:
ManagedPolicyArns:
- "arn:aws:iam::aws:policy/AmazonS3ReadOnlyAccess"
- "arn:aws:iam::aws:policy/AmazonSSMFullAccess"
AssumeRolePolicyDocument:
Version: 2012-10-17
Statement:
- Effect: Allow
Principal:
Service:
- ec2.amazonaws.com
Action:
- 'sts:AssumeRole'
Path: "/"
ProfileWithRolesForApp:
Type: AWS::IAM::InstanceProfile
Properties:
Path: "/"
Roles:
- !Ref UdagramS3ReadOnlyEC2