Provides AWS CloudFormation templates for Auto Scaling Groups on EC2, ECS, and Lambda, including launch configurations/templates, scaling policies, lifecycle hooks, predictive scaling, and best practices for high availability.
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Create production-ready Auto Scaling infrastructure using AWS CloudFormation templates. This skill covers Auto Scaling Groups for EC2, ECS, and Lambda, launch configurations, launch templates, scaling policies, lifecycle hooks, and best practices for high availability and cost optimization.
Use this skill when:
Follow these steps to create Auto Scaling infrastructure with CloudFormation:
Specify capacity and instance settings with AWS-specific parameter types:
Parameters:
MinSize:
Type: Number
Default: 2
Description: Minimum number of instances
MaxSize:
Type: Number
Default: 10
Description: Maximum number of instances
DesiredCapacity:
Type: Number
Default: 2
Description: Desired number of instances
InstanceType:
Type: AWS::EC2::Instance::Type
Default: t3.micro
Description: EC2 instance type
AmiId:
Type: AWS::EC2::Image::Id
Description: AMI ID for instances
SubnetIds:
Type: List<AWS::EC2::Subnet::Id>
Description: Subnets for Auto Scaling group
Define instance launch settings:
Resources:
MyLaunchConfiguration:
Type: AWS::AutoScaling::LaunchConfiguration
Properties:
LaunchConfigurationName: !Sub "${AWS::StackName}-lc"
ImageId: !Ref AmiId
InstanceType: !Ref InstanceType
KeyName: !Ref KeyName
SecurityGroups:
- !Ref InstanceSecurityGroup
InstanceMonitoring: Enabled
UserData:
Fn::Base64: |
#!/bin/bash
yum update -y
yum install -y httpd
systemctl start httpd
Specify min/max/desired capacity and networking:
Resources:
MyAutoScalingGroup:
Type: AWS::AutoScaling::AutoScalingGroup
Properties:
AutoScalingGroupName: !Sub "${AWS::StackName}-asg"
MinSize: !Ref MinSize
MaxSize: !Ref MaxSize
DesiredCapacity: !Ref DesiredCapacity
VPCZoneIdentifier: !Ref SubnetIds
LaunchConfigurationName: !Ref MyLaunchConfiguration
TargetGroupARNs:
- !Ref MyTargetGroup
HealthCheckType: ELB
HealthCheckGracePeriod: 300
Tags:
- Key: Environment
Value: !Ref Environment
PropagateAtLaunch: true
Set up ALB for traffic distribution:
Resources:
MyTargetGroup:
Type: AWS::ElasticLoadBalancingV2::TargetGroup
Properties:
Name: !Sub "${AWS::StackName}-tg"
Port: 80
Protocol: HTTP
VpcId: !Ref VPCId
HealthCheckPath: /
TargetType: instance
MyLoadBalancer:
Type: AWS::ElasticLoadBalancingV2::LoadBalancer
Properties:
Name: !Sub "${AWS::StackName}-alb"
Scheme: internet-facing
Type: application
Subnets:
- !Ref PublicSubnet1
- !Ref PublicSubnet2
Implement target tracking scaling:
Resources:
TargetTrackingPolicy:
Type: AWS::AutoScaling::ScalingPolicy
Properties:
PolicyName: !Sub "${AWS::StackName}-target-tracking"
PolicyType: TargetTrackingScaling
AutoScalingGroupName: !Ref MyAutoScalingGroup
TargetTrackingConfiguration:
PredefinedMetricSpecification:
PredefinedMetricType: ASGAverageCPUUtilization
TargetValue: 70
DisableScaleIn: false
Implement hooks for graceful instance management:
Resources:
LifecycleHookTermination:
Type: AWS::AutoScaling::LifecycleHook
Properties:
LifecycleHookName: !Sub "${AWS::StackName}-termination-hook"
AutoScalingGroupName: !Ref MyAutoScalingGroup
LifecycleTransition: autoscaling:EC2_INSTANCE_TERMINATING
HeartbeatTimeout: 300
NotificationTargetARN: !Ref SNSTopic
RoleARN: !Ref LifecycleHookRole
Configure CloudWatch alarms for scaling triggers:
Resources:
HighCpuAlarm:
Type: AWS::CloudWatch::Alarm
Properties:
AlarmName: !Sub "${AWS::StackName}-high-cpu"
MetricName: CPUUtilization
Namespace: AWS/EC2
Dimensions:
- Name: AutoScalingGroupName
Value: !Ref MyAutoScalingGroup
Statistic: Average
Period: 60
EvaluationPeriods: 3
Threshold: 70
ComparisonOperator: GreaterThanThreshold
Export ASG configuration for other stacks:
Outputs:
AutoScalingGroupName:
Description: Name of the Auto Scaling Group
Value: !Ref MyAutoScalingGroup
Export:
Name: !Sub "${AWS::StackName}-AutoScalingGroupName"
AutoScalingGroupArn:
Description: ARN of the Auto Scaling Group
Value: !GetAtt MyAutoScalingGroup.AutoScalingGroupArn
Export:
Name: !Sub "${AWS::StackName}-AutoScalingGroupArn"
Full end-to-end template with VPC, ASG, ALB, and scaling policies:
AWSTemplateFormatVersion: '2010-09-09'
Description: Auto Scaling Group with ALB integration
Parameters:
Environment:
Type: String
Default: production
InstanceType:
Type: AWS::EC2::Instance::Type
Default: t3.micro
AmiId:
Type: AWS::EC2::Image::Id
VpcId:
Type: AWS::EC2::VPC::Id
SubnetIds:
Type: List<AWS::EC2::Subnet::Id>
Resources:
InstanceSecurityGroup:
Type: AWS::EC2::SecurityGroup
Properties:
GroupDescription: Security group for ASG instances
VpcId: !Ref VpcId
SecurityGroupEgress:
- CidrIp: 0.0.0.0/0
IpProtocol: "-1"
TargetGroup:
Type: AWS::ElasticLoadBalancingV2::TargetGroup
Properties:
Name: !Sub "${AWS::StackName}-tg"
Port: 80
Protocol: HTTP
VpcId: !Ref VpcId
HealthCheckPath: /health
TargetType: instance
LaunchTemplate:
Type: AWS::EC2::LaunchTemplate
Properties:
LaunchTemplateName: !Sub "${AWS::StackName}-lt"
ImageId: !Ref AmiId
InstanceType: !Ref InstanceType
SecurityGroupIds:
- !Ref InstanceSecurityGroup
AutoScalingGroup:
Type: AWS::AutoScaling::AutoScalingGroup
Properties:
AutoScalingGroupName: !Sub "${AWS::StackName}-asg"
MinSize: 2
MaxSize: 10
DesiredCapacity: 4
LaunchTemplate:
LaunchTemplateId: !Ref LaunchTemplate
Version: !GetAtt LaunchTemplate.LatestVersionNumber
VPCZoneIdentifier: !Ref SubnetIds
TargetGroupARNs:
- !Ref TargetGroup
HealthCheckType: ELB
HealthCheckGracePeriod: 300
Tags:
- Key: Name
Value: !Sub "${AWS::StackName}-instance"
PropagateAtLaunch: true
ScalingPolicy:
Type: AWS::AutoScaling::ScalingPolicy
Properties:
PolicyName: !Sub "${AWS::StackName}-cpu-policy"
PolicyType: TargetTrackingScaling
AutoScalingGroupName: !Ref AutoScalingGroup
TargetTrackingConfiguration:
PredefinedMetricSpecification:
PredefinedMetricType: ASGAverageCPUUtilization
TargetValue: 70
Outputs:
AutoScalingGroupName:
Value: !Ref AutoScalingGroup
Export:
Name: !Sub "${AWS::StackName}-ASG-Name"
Validate template and test changes before deployment:
# Validate CloudFormation template
aws cloudformation validate-template --template-body file://template.yaml
# Create change set to preview changes
aws cloudformation create-change-set \
--stack-name my-asg-stack \
--template-body file://template.yaml \
--change-set-type CREATE
# Describe change set
aws cloudformation describe-change-set \
--stack-name my-asg-stack \
--change-set-name <change-set-id>
# Execute change set
aws cloudformation execute-change-set \
--stack-name my-asg-stack \
--change-set-name <change-set-id>
Verify ASG health and configuration after deployment:
# Describe Auto Scaling Groups
aws autoscaling describe-auto-scaling-groups \
--auto-scaling-group-names my-asg-stack-asg
# Check instance health
aws autoscaling describe-auto-scaling-instances \
--instance-ids <instance-id>
# Verify scaling policies
aws autoscaling describe-policies \
--auto-scaling-group-name my-asg-stack-asg
# Review scaling activities
aws autoscaling describe-scaling-activities \
--auto-scaling-group-name my-asg-stack-asg
UpdatePolicy for graceful updates and instance refreshHealthCheckGracePeriod >= expected instance initialization timeInstanceMaintenancePolicy to avoid unexpected terminationsaws-autoscaling.amazonaws.com)For detailed implementation guidance, see: