# Auto Scaling examples using SDK for Ruby
<a name="ruby_auto-scaling_code_examples"></a>

The following code examples show you how to perform actions and implement common scenarios by using the Amazon SDK for Ruby with Auto Scaling.

Each example includes a link to the complete source code, where you can find instructions on how to set up and run the code in context.

**Topics**
+ [Get started](#get_started)

## Get started
<a name="get_started"></a>

### Hello Auto Scaling
<a name="auto-scaling_Hello_ruby_topic"></a>

The following code example shows how to get started using Auto Scaling.

**SDK for Ruby**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [Amazon Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/ruby/example_code/auto-scaling#code-examples). 

```
require 'aws-sdk-autoscaling'
require 'logger'

# AutoScalingManager is a class responsible for managing AWS Auto Scaling operations
# such as listing all Auto Scaling groups in the current AWS account.
class AutoScalingManager
  def initialize(client)
    @client = client
    @logger = Logger.new($stdout)
  end

  # Gets and prints a list of Auto Scaling groups for the account.
  def list_auto_scaling_groups
    paginator = @client.describe_auto_scaling_groups
    auto_scaling_groups = []
    paginator.each_page do |page|
      auto_scaling_groups.concat(page.auto_scaling_groups)
    end

    if auto_scaling_groups.empty?
      @logger.info('No Auto Scaling groups found for this account.')
    else
      auto_scaling_groups.each do |group|
        @logger.info("Auto Scaling group name: #{group.auto_scaling_group_name}")
        @logger.info("  Group ARN:             #{group.auto_scaling_group_arn}")
        @logger.info("  Min/max/desired:       #{group.min_size}/#{group.max_size}/#{group.desired_capacity}")
        @logger.info("\n")
      end
    end
  end
end

if $PROGRAM_NAME == __FILE__
  autoscaling_client = Aws::AutoScaling::Client.new
  manager = AutoScalingManager.new(autoscaling_client)
  manager.list_auto_scaling_groups
end
```
+  For API details, see [DescribeAutoScalingGroups](https://docs.amazonaws.cn/goto/SdkForRubyV3/autoscaling-2011-01-01/DescribeAutoScalingGroups) in *Amazon SDK for Ruby API Reference*.