Auto Scaling

Overview

CloudMock emulates Amazon EC2 Auto Scaling, supporting launch configurations, auto scaling groups with capacity management, scaling policies, and instance lifecycle operations.

Supported Operations

Operation	Status	Notes
CreateLaunchConfiguration	Supported	Creates a launch configuration
DescribeLaunchConfigurations	Supported	Lists launch configurations
DeleteLaunchConfiguration	Supported	Deletes a launch configuration
CreateAutoScalingGroup	Supported	Creates an auto scaling group
DescribeAutoScalingGroups	Supported	Lists auto scaling groups
UpdateAutoScalingGroup	Supported	Updates group configuration
DeleteAutoScalingGroup	Supported	Deletes an auto scaling group
SetDesiredCapacity	Supported	Sets the desired instance count
DescribeAutoScalingInstances	Supported	Lists instances in ASGs
AttachInstances	Supported	Attaches instances to an ASG
DetachInstances	Supported	Detaches instances from an ASG
PutScalingPolicy	Supported	Creates or updates a scaling policy
DescribePolicies	Supported	Lists scaling policies
DeletePolicy	Supported	Deletes a scaling policy
CreateOrUpdateTags	Supported	Creates or updates ASG tags
DescribeTags	Supported	Lists ASG tags
DeleteTags	Supported	Deletes ASG tags

Quick Start

Node.js

import { AutoScalingClient, CreateAutoScalingGroupCommand } from '@aws-sdk/client-auto-scaling';

const client = new AutoScalingClient({
  endpoint: 'http://localhost:4566',
  region: 'us-east-1',
  credentials: { accessKeyId: 'test', secretAccessKey: 'test' },
});

await client.send(new CreateAutoScalingGroupCommand({
  AutoScalingGroupName: 'my-asg',
  LaunchConfigurationName: 'my-lc',
  MinSize: 1,
  MaxSize: 5,
  DesiredCapacity: 2,
  AvailabilityZones: ['us-east-1a'],
}));

Python

import boto3

client = boto3.client('autoscaling',
    endpoint_url='http://localhost:4566',
    region_name='us-east-1',
    aws_access_key_id='test',
    aws_secret_access_key='test')

client.create_auto_scaling_group(
    AutoScalingGroupName='my-asg',
    LaunchConfigurationName='my-lc',
    MinSize=1,
    MaxSize=5,
    DesiredCapacity=2,
    AvailabilityZones=['us-east-1a'])

Configuration

cloudmock.yml

services:
  autoscaling:
    enabled: true

Known Differences from AWS

• Scaling policies are stored but automatic scaling based on metrics is not performed
• Instance reconciliation is simulated but does not launch real EC2 instances
• Health checks are simplified