Class: RightAws::AsInterface

Inherits:
RightAwsBase show all
Includes:
RightAwsBaseInterface
Defined in:
lib/as/right_as_interface.rb

Overview

RightAWS::AsInterface – RightScale Amazon Auto Scaling interface

The RightAws::AsInterface class provides a complete interface to Amazon Auto Scaling service.

For explanations of the semantics of each call, please refer to Amazon’s documentation at docs.amazonwebservices.com/AutoScaling/latest/DeveloperGuide/

Create an interface handle:

as = RightAws::AsInterface.new(aws_access_key_id, aws_security_access_key)

Create a launch configuration:

as.create_launch_configuration('CentOS.5.1-c', 'ami-08f41161', 'm1.small',
                               :key_name        => 'kd-moo-test',
                               :security_groups => ['default'],
                               :user_data       => "Woohoo: CentOS.5.1-c" )

Create an AutoScaling group:

as.create_auto_scaling_group('CentOS.5.1-c-array', 'CentOS.5.1-c', 'us-east-1c',
                             :min_size => 2,
                             :max_size => 5)

Create a new trigger:

as.create_or_update_scaling_trigger('kd.tr.1', 'CentOS.5.1-c-array',
                                    :measure_name => 'CPUUtilization',
                                    :statistic => :average,
                                    :dimensions => {
                                       'AutoScalingGroupName' => 'CentOS.5.1-c-array',
                                       'Namespace' => 'AWS',
                                       'Service' => 'EC2' },
                                    :period => 60,
                                    :lower_threshold => 5,
                                    :lower_breach_scale_increment => -1,
                                    :upper_threshold => 60,
                                    :upper_breach_scale_increment => 1,
                                    :breach_duration => 300 )

Describe scaling activity:

as.incrementally_describe_scaling_activities('CentOS.5.1-c-array') #=> List of activities

Describe the Auto Scaling group status:

as.describe_auto_scaling_groups('CentOS.5.1-c-array') #=> Current group status

Defined Under Namespace

Classes: DescribeAutoScalingGroupsParser, DescribeLaunchConfigurationsParser, DescribeScalingActivitiesParser, DescribeTriggersParser

Constant Summary collapse

API_VERSION =

Amazon AS API version being used

'2009-05-15'
DEFAULT_HOST = 
'autoscaling.amazonaws.com'
DEFAULT_PATH = 
'/'
DEFAULT_PROTOCOL = 
'https'
DEFAULT_PORT = 
443
@@bench = 
AwsBenchmarkingBlock.new

Constants included from RightAwsBaseInterface

RightAwsBaseInterface::BLOCK_DEVICE_KEY_MAPPING, RightAwsBaseInterface::DEFAULT_SIGNATURE_VERSION

Constants inherited from RightAwsBase

RightAwsBase::AMAZON_PROBLEMS, RightAwsBase::RAISE_ON_TIMEOUT_ON_ACTIONS

Instance Attribute Summary

Attributes included from RightAwsBaseInterface

#aws_access_key_id, #aws_secret_access_key, #cache, #connection, #last_errors, #last_request, #last_request_id, #last_response, #logger, #params, #signature_version

Class Method Summary collapse

Instance Method Summary collapse

Methods included from RightAwsBaseInterface

#amazonize_block_device_mappings, #amazonize_hash_with_key_mapping, #amazonize_list, #amazonize_list_with_key_mapping, #cache_hits?, caching, caching=, #caching?, #destroy_connection, #generate_request_impl, #get_connection, #get_connections_storage, #get_server_url, #incrementally_list_items, #init, #map_api_keys_and_values, #on_exception, #request_cache_or_info, #request_info_impl, #signed_service_params, #update_cache, #with_connection_options

Methods inherited from RightAwsBase

amazon_problems, amazon_problems=, raise_on_timeout_on_actions, raise_on_timeout_on_actions=

Constructor Details

#initialize(aws_access_key_id = nil, aws_secret_access_key = nil, params = {}) ⇒ AsInterface

Create a new handle to an CSLS account. All handles share the same per process or per thread HTTP connection to Amazon CSLS. Each handle is for a specific account. The params have the following options:

  • :endpoint_url a fully qualified url to Amazon API endpoint (this overwrites: :server, :port, :service, :protocol). Example: ‘autoscaling.amazonaws.com/’

  • :server: AS service host, default: DEFAULT_HOST

  • :port: AS service port, default: DEFAULT_PORT

  • :protocol: ‘http’ or ‘https’, default: DEFAULT_PROTOCOL

  • :logger: for log messages, default: RAILS_DEFAULT_LOGGER else STDOUT

  • :signature_version: The signature version : ‘0’,‘1’ or ‘2’(default)

  • :cache: true/false(default): describe_auto_scaling_groups



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# File 'lib/as/right_as_interface.rb', line 102

def initialize(aws_access_key_id=nil, aws_secret_access_key=nil, params={})
  init({ :name                => 'AS',
         :default_host        => ENV['AS_URL'] ? URI.parse(ENV['AS_URL']).host   : DEFAULT_HOST,
         :default_port        => ENV['AS_URL'] ? URI.parse(ENV['AS_URL']).port   : DEFAULT_PORT,
         :default_service     => ENV['AS_URL'] ? URI.parse(ENV['AS_URL']).path   : DEFAULT_PATH,
         :default_protocol    => ENV['AS_URL'] ? URI.parse(ENV['AS_URL']).scheme : DEFAULT_PROTOCOL,
         :default_api_version => ENV['AS_API_VERSION'] || API_VERSION },
       aws_access_key_id    || ENV['AWS_ACCESS_KEY_ID'] ,
       aws_secret_access_key|| ENV['AWS_SECRET_ACCESS_KEY'],
       params)
end

Class Method Details

.bench_service ⇒ Object 



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# File 'lib/as/right_as_interface.rb', line 87

def self.bench_service
  @@bench.service
end

.bench_xml ⇒ Object 



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# File 'lib/as/right_as_interface.rb', line 84

def self.bench_xml
  @@bench.xml
end

Instance Method Details

#create_auto_scaling_group(auto_scaling_group_name, launch_configuration_name, availability_zones, options = {}) ⇒ Object

Creates a new auto scaling group with the specified name. Returns true or raises an exception.

Options: :min_size, :max_size, :cooldown, :load_balancer_names

as.create_auto_scaling_group('CentOS.5.1-c-array', 'CentOS.5.1-c', 'us-east-1c',
                             :min_size => 2,
                             :max_size => 5)  #=> true

Amazon’s notice: Constraints: Restricted to one Availability Zone



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# File 'lib/as/right_as_interface.rb', line 151

def create_auto_scaling_group(auto_scaling_group_name, launch_configuration_name, availability_zones, options={})
  options[:min_size] ||= 1
  options[:max_size] ||= 20
  options[:cooldown] ||= 0
  request_hash = amazonize_list('AvailabilityZones.member', availability_zones)
  request_hash.merge!( amazonize_list('LoadBalancerNames.member', options[:load_balancer_names]) )
  request_hash.merge!( 'AutoScalingGroupName'    => auto_scaling_group_name,
                       'LaunchConfigurationName' => launch_configuration_name,
                       'MinSize'                 => options[:min_size],
                       'MaxSize'                 => options[:max_size],
                       'Cooldown'                => options[:cooldown] )
  link = generate_request("CreateAutoScalingGroup", request_hash)
  request_info(link, RightHttp2xxParser.new(:logger => @logger))
end

#create_launch_configuration(launch_configuration_name, image_id, instance_type, options = {}) ⇒ Object

Creates a new Launch Configuration. Please note that the launch configuration name used must be unique, within the scope of your Amazon Web Services AWS account, and the maximum limit of launch configurations must not yet have been met, or else the call will fail.

Once created, the new launch configuration is available for immediate use.

Options: :security_groups, :block_device_mappings, :key_name, :user_data, :kernel_id, :ramdisk_id

as.create_launch_configuration('kd: CentOS.5.1-c.1', 'ami-08f41161', 'c1.medium',
  :key_name        => 'tim',
  :security_groups => ['default'],
  :user_data       => "Woohoo: CentOS.5.1-c",
  :block_device_mappings => [ { :device_name     => '/dev/sdk',
                                :ebs_snapshot_id => 'snap-145cbc7d',
        :ebs_delete_on_termination => true,
        :ebs_volume_size => 3,
        :virtual_name => 'ephemeral2'
                              } ]
  ) #=> true



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# File 'lib/as/right_as_interface.rb', line 353

def create_launch_configuration(launch_configuration_name, image_id, instance_type, options={})
  request_hash = { 'LaunchConfigurationName' => launch_configuration_name,
                   'ImageId'                 => image_id,
                   'InstanceType'            => instance_type }
  request_hash.merge!(amazonize_list('SecurityGroups.member',      options[:security_groups]))       unless options[:security_groups].right_blank?
  request_hash.merge!(amazonize_block_device_mappings(options[:block_device_mappings], 'BlockDeviceMappings.member'))
  request_hash['KeyName']   = options[:key_name]   if options[:key_name]
  request_hash['UserData']  = Base64.encode64(options[:user_data]).delete("\n") unless options[:user_data].right_blank? if options[:user_data]
  request_hash['KernelId']  = options[:kernel_id]  if options[:kernel_id]
  request_hash['RamdiskId'] = options[:ramdisk_id] if options[:ramdisk_id]
  link = generate_request("CreateLaunchConfiguration", request_hash)
  request_info(link, RightHttp2xxParser.new(:logger => @logger))
end

#create_or_update_scaling_trigger(trigger_name, auto_scaling_group_name, options = {}) ⇒ Object

Create or update specified trigger. This call sets the parameters that governs when and how to scale an AutoScalingGroup. If the Trigger, within the scope of the caller’s AWS account, specified already exists, it will be updated. If a trigger with a different name already exists, this call will fail.

Returns true or an exception.

Options: :measure_name, :statistic, :period, :lower_threshold, :lower_breach_scale_increment, :upper_threshold, :upper_breach_scale_increment, :dimensions, :breach_duration, :unit, :custom_unit

as.create_or_update_scaling_trigger('kd.tr.1', 'CentOS.5.1-c-array',
                                    :measure_name => 'CPUUtilization',
                                    :statistic => :average,
                                    :dimensions => {
                                       'AutoScalingGroupName' => 'CentOS.5.1-c-array',
                                       'Namespace' => 'AWS',
                                       'Service' => 'EC2' },
                                    :period => 60,
                                    :lower_threshold => 5,
                                    :lower_breach_scale_increment => -1,
                                    :upper_threshold => 60,
                                    :upper_breach_scale_increment => 1,
                                    :breach_duration => 300 ) #=> true



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# File 'lib/as/right_as_interface.rb', line 473

def create_or_update_scaling_trigger(trigger_name, auto_scaling_group_name, options={})
  request_hash = { 'TriggerName'               => trigger_name,
                   'AutoScalingGroupName'      => auto_scaling_group_name,
                   'MeasureName'               => options[:measure_name],
                   'Statistic'                 => options[:statistic].to_s.capitalize,
                   'Period'                    => options[:period],
                   'LowerThreshold'            => options[:lower_threshold],
                   'LowerBreachScaleIncrement' => options[:lower_breach_scale_increment],
                   'UpperThreshold'            => options[:upper_threshold],
                   'UpperBreachScaleIncrement' => options[:upper_breach_scale_increment],
                   'BreachDuration'            => options[:breach_duration] }
  request_hash['Unit']       = options[:unit]        if options[:unit]
  request_hash['CustomUnit'] = options[:custom_unit] if options[:custom_unit]
  dimensions = []
  (options[:dimensions] || {}).each do |key, values|
    Array(values).each { |value| dimensions << [key, value] }
  end
  request_hash.merge!(amazonize_list(['Dimensions.member.?.Name', 'Dimensions.member.?.Value'], dimensions))
  link = generate_request("CreateOrUpdateScalingTrigger", request_hash)
  request_info(link, RightHttp2xxParser.new(:logger => @logger))
end

#delete_auto_scaling_group(auto_scaling_group_name) ⇒ Object

Deletes all configuration for this auto scaling group and also deletes the group. Returns true or raises an exception.



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# File 'lib/as/right_as_interface.rb', line 169

def delete_auto_scaling_group(auto_scaling_group_name)
  link = generate_request('DeleteAutoScalingGroup', 'AutoScalingGroupName' => auto_scaling_group_name)
  request_info(link, RightHttp2xxParser.new(:logger => @logger))
end

#delete_launch_configuration(launch_configuration_name) ⇒ Object

Delete launch configuration. Returns true or an exception.

as.delete_launch_configuration('CentOS.5.1') #=> true



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# File 'lib/as/right_as_interface.rb', line 440

def delete_launch_configuration(launch_configuration_name)
  link = generate_request('DeleteLaunchConfiguration', 'LaunchConfigurationName' => launch_configuration_name)
  request_info(link, RightHttp2xxParser.new(:logger => @logger))
end

#delete_trigger(trigger_name, auto_scaling_group_name) ⇒ Object

Delete specified trigger. Returns true or an exception.

as.delete_trigger('kd.tr.1', 'CentOS.5.1-c-array') #=> true



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# File 'lib/as/right_as_interface.rb', line 526

def delete_trigger(trigger_name, auto_scaling_group_name)
  link = generate_request('DeleteTrigger', 'TriggerName'          => trigger_name,
                                           'AutoScalingGroupName' => auto_scaling_group_name)
  request_info(link, RightHttp2xxParser.new(:logger => @logger))
end

#describe_auto_scaling_groups(*auto_scaling_group_names) ⇒ Object

Describe auto scaling groups. Returns a full description of the AutoScalingGroups from the given list. This includes all EC2 instances that are members of the group. If a list of names is not provided, then the full details of all AutoScalingGroups is returned. This style conforms to the EC2 DescribeInstances API behavior.



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# File 'lib/as/right_as_interface.rb', line 134

def describe_auto_scaling_groups(*auto_scaling_group_names)
  auto_scaling_group_names = auto_scaling_group_names.flatten.compact
  request_hash = amazonize_list('AutoScalingGroupNames.member', auto_scaling_group_names)
  link = generate_request("DescribeAutoScalingGroups", request_hash)
  request_cache_or_info(:describe_auto_scaling_groups, link,  DescribeAutoScalingGroupsParser, @@bench, auto_scaling_group_names.right_blank?)
end

#describe_launch_configurations(*launch_configuration_names) ⇒ Object

Describe all Launch Configurations. Returns an array of configurations.

as.describe_launch_configurations #=>
  [{:security_groups=>["default"],
    :ramdisk_id=>"",
    :user_data=>"V29vaG9vOiBDZW50T1MuNS4xLWM=",
    :instance_type=>"c1.medium",
    :block_device_mappings=>
     [{:virtual_name=>"ephemeral2", :device_name=>"/dev/sdk"}],
    :launch_configuration_name=>"kd: CentOS.5.1-c.1",
    :created_time=>"2010-03-29T10:00:32.742Z",
    :image_id=>"ami-08f41161",
    :key_name=>"tim",
    :kernel_id=>""}, ...]



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# File 'lib/as/right_as_interface.rb', line 384

def describe_launch_configurations(*launch_configuration_names)
  result = []
  incrementally_describe_launch_configurations(*launch_configuration_names) do |response|
    result += response[:launch_configurations]
    true
  end
  result
end

#describe_scaling_activities(auto_scaling_group_name, *activity_ids) ⇒ Object

Describe all Scaling Activities.

describe_scaling_activities('CentOS.5.1-c-array') #=>
      [{:cause=>
          "At 2009-05-28 10:11:35Z trigger kd.tr.1 breached high threshold value for
           CPUUtilization, 10.0, adjusting the desired capacity from 1 to 2.  At 2009-05-28 10:11:35Z
           a breaching trigger explicitly set group desired capacity changing the desired capacity
           from 1 to 2.  At 2009-05-28 10:11:40Z an instance was started in response to a difference
           between desired and actual capacity, increasing the capacity from 1 to 2.",
        :activity_id=>"067c9abb-f8a7-4cf8-8f3c-dc6f280457c4",
        :progress=>0,
        :description=>"Launching a new EC2 instance",
        :status_code=>"InProgress",
        :start_time=>Thu May 28 10:11:40 UTC 2009},
       {:end_time=>Thu May 28 09:35:23 UTC 2009,
        :cause=>
          "At 2009-05-28 09:31:21Z a user request created an AutoScalingGroup changing the desired
           capacity from 0 to 1.  At 2009-05-28 09:32:35Z an instance was started in response to a
           difference between desired and actual capacity, increasing the capacity from 0 to 1.",
        :activity_id=>"90d506ba-1b75-4d29-8739-0a75b1ba8030",
        :progress=>100,
        :description=>"Launching a new EC2 instance",
        :status_code=>"Successful",
        :start_time=>Thu May 28 09:32:35 UTC 2009}]}



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# File 'lib/as/right_as_interface.rb', line 245

def describe_scaling_activities(auto_scaling_group_name, *activity_ids)
  result = []
  incrementally_describe_scaling_activities(auto_scaling_group_name, *activity_ids) do |response|
    result += response[:scaling_activities]
    true
  end
  result
end

#describe_triggers(auto_scaling_group_name) ⇒ Object

Describe triggers. Returns a full description of the trigger in the specified Auto Scaling Group.

as.describe_triggers('CentOS.5.1-c-array') #=>
    [{:status=>"HighBreaching",
      :breach_duration=>300,
      :measure_name=>"CPUUtilization",
      :trigger_name=>"kd.tr.1",
      :period=>60,
      :lower_threshold=>0.0,
      :lower_breach_scale_increment=>-1,
      :dimensions=>
       {"Namespace"=>"AWS",
        "AutoScalingGroupName"=>"CentOS.5.1-c-array",
        "Service"=>"EC2"},
      :statistic=>"Average",
      :upper_threshold=>10.0,
      :created_time=>Thu May 28 09:48:46 UTC 2009,
      :auto_scaling_group_name=>"CentOS.5.1-c-array",
      :upper_breach_scale_increment=>1}]



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# File 'lib/as/right_as_interface.rb', line 516

def describe_triggers(auto_scaling_group_name)
  link = generate_request("DescribeTriggers", 'AutoScalingGroupName' => auto_scaling_group_name)
  request_info(link, DescribeTriggersParser.new(:logger => @logger))
end

#generate_request(action, params = {}) ⇒ Object

:nodoc:



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# File 'lib/as/right_as_interface.rb', line 114

def generate_request(action, params={}) #:nodoc:
  generate_request_impl(:get, action, params )
end

#incrementally_describe_launch_configurations(*launch_configuration_names, &block) ⇒ Object

Incrementally describe Launch Configurations. Returns a full description of the launch configurations given the specified names. If no names are specified, then the full details of all launch configurations are returned.

Optional params: :max_records, :next_token.

# get max 100 first configurations
as.incrementally_describe_launch_configurations #=>
    {:launch_configurations=>
      [{:created_time=>Thu May 28 09:31:20 UTC 2009,
        :kernel_id=>"",
        :launch_configuration_name=>"CentOS.5.1-c",
        :ramdisk_id=>"",
        :security_groups=>["default"],
        :key_name=>"kd-moo-test",
        :user_data=>"Woohoo: CentOS.5.1-c-array",
        :image_id=>"ami-08f41161",
        :block_device_mappings=>[],
        :instance_type=>"m1.small"}, ... ]}

# list by 5 records
incrementally_describe_launch_configurations(:max_records => 5) do |response|
  puts response.inspect
  true
end



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# File 'lib/as/right_as_interface.rb', line 419

def incrementally_describe_launch_configurations(*launch_configuration_names, &block)
  launch_configuration_names = launch_configuration_names.flatten.compact
  params = launch_configuration_names.last.kind_of?(Hash) ? launch_configuration_names.pop : {}
  request_hash = amazonize_list('LaunchConfigurationNames.member', launch_configuration_names)
  request_hash['MaxRecords'] = params[:max_records] if params[:max_records]
  request_hash['NextToken']  = params[:next_token]  if params[:next_token]
  last_response = nil
  loop do
    link = generate_request("DescribeLaunchConfigurations", request_hash)
    last_response = request_info( link, DescribeLaunchConfigurationsParser.new(:logger => @logger) )
    request_hash['NextToken'] = last_response[:next_token]
    break unless block && block.call(last_response) && !last_response[:next_token].right_blank?
  end
  last_response
end

#incrementally_describe_scaling_activities(auto_scaling_group_name, *activity_ids, &block) ⇒ Object

Incrementally describe Scaling Activities. Returns the scaling activities specified for the given group. If the input list is empty, all the activities from the past six weeks will be returned. Activities will be sorted by completion time. Activities that have no completion time will be considered as using the most recent possible time.

Optional params: :max_records, :next_token.

# get max 100 first activities
as.incrementally_describe_scaling_activities('CentOS.5.1-c-array') #=>
    {:scaling_activities=>
      [{:cause=>
          "At 2009-05-28 10:11:35Z trigger kd.tr.1 breached high threshold value for
           CPUUtilization, 10.0, adjusting the desired capacity from 1 to 2.  At 2009-05-28 10:11:35Z
           a breaching trigger explicitly set group desired capacity changing the desired capacity
           from 1 to 2.  At 2009-05-28 10:11:40Z an instance was started in response to a difference
           between desired and actual capacity, increasing the capacity from 1 to 2.",
        :activity_id=>"067c9abb-f8a7-4cf8-8f3c-dc6f280457c4",
        :progress=>0,
        :description=>"Launching a new EC2 instance",
        :status_code=>"InProgress",
        :start_time=>Thu May 28 10:11:40 UTC 2009},
       {:end_time=>Thu May 28 09:35:23 UTC 2009,
        :cause=>
          "At 2009-05-28 09:31:21Z a user request created an AutoScalingGroup changing the desired
           capacity from 0 to 1.  At 2009-05-28 09:32:35Z an instance was started in response to a
           difference between desired and actual capacity, increasing the capacity from 0 to 1.",
        :activity_id=>"90d506ba-1b75-4d29-8739-0a75b1ba8030",
        :progress=>100,
        :description=>"Launching a new EC2 instance",
        :status_code=>"Successful",
        :start_time=>Thu May 28 09:32:35 UTC 2009}]}

# list by 5 records
incrementally_describe_scaling_activities('CentOS.5.1-c-array', :max_records => 5) do |response|
  puts response.inspect
  true
end



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# File 'lib/as/right_as_interface.rb', line 292

def incrementally_describe_scaling_activities(auto_scaling_group_name, *activity_ids, &block)
  activity_ids = activity_ids.flatten.compact
  params = activity_ids.last.kind_of?(Hash) ? activity_ids.pop : {}
  request_hash = amazonize_list('ActivityIds.member', activity_ids)
  request_hash['AutoScalingGroupName'] = auto_scaling_group_name
  request_hash['MaxRecords'] = params[:max_records] if params[:max_records]
  request_hash['NextToken']  = params[:next_token]  if params[:next_token]
  last_response = nil
  loop do
    link = generate_request("DescribeScalingActivities", request_hash)
    last_response = request_info( link,  DescribeScalingActivitiesParser.new(:logger => @logger))
    request_hash['NextToken'] = last_response[:next_token]
    break unless block && block.call(last_response) && !last_response[:next_token].right_blank?
  end
  last_response
end

#request_info(request, parser) ⇒ Object

Sends request to Amazon and parses the response Raises AwsError if any banana happened



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# File 'lib/as/right_as_interface.rb', line 120

def request_info(request, parser)  #:nodoc:
  request_info_impl(:aass_connection, @@bench, request, parser)
end

#set_desired_capacity(auto_scaling_group_name, desired_capacity) ⇒ Object

Adjusts the desired size of the Capacity Group by using scaling actions, as necessary. When adjusting the size of the group downward, it is not possible to define which EC2 instances will be terminated. This also applies to any auto-scaling decisions that might result in the termination of instances.

Returns true or raises an exception.

as.set_desired_capacity('CentOS.5.1-c',3) #=> 3



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# File 'lib/as/right_as_interface.rb', line 183

def set_desired_capacity(auto_scaling_group_name, desired_capacity)
  link = generate_request('SetDesiredCapacity', 'AutoScalingGroupName' => auto_scaling_group_name,
                                                'DesiredCapacity'      => desired_capacity )
  request_info(link, RightHttp2xxParser.new(:logger => @logger))
end

#terminate_instance_in_auto_scaling_group(instance_id, should_decrement_desired_capacity = true) ⇒ Object

This call will terminate the specified Instance. Optionally, the desired group size can be adjusted. If set to true, the default, the AutoScalingGroup size will decrease by one. If the AutoScalingGroup is associated with a LoadBalancer, the system will deregister the instance before terminating it. This call simply registers a termination request. The termination of the instance can not happen immediately.

Returns the activity to terminate the instance.



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# File 'lib/as/right_as_interface.rb', line 321

def terminate_instance_in_auto_scaling_group(instance_id, should_decrement_desired_capacity=true)
  request_hash = { 'InstanceId' => instance_id }
  request_hash['ShouldDecrementDesiredCapacity'] = should_decrement_desired_capacity
  link = generate_request('TerminateInstanceInAutoScalingGroup', request_hash )
  request_info(link, DescribeScalingActivitiesParser.new(:logger => @logger))[:scaling_activities].first
end

#update_auto_scaling_group(auto_scaling_group_name, options = {}) ⇒ Object

Updates the configuration for the given AutoScalingGroup. If MaxSize is lower than the current size, then there will be an implicit call to SetDesiredCapacity to set the group to the new MaxSize. The same is true for MinSize there will also be an implicit call to SetDesiredCapacity. All optional parameters are left unchanged if not passed in the request.

The new settings are registered upon the completion of this call. Any launch configuration settings will take effect on any triggers after this call returns. However, triggers that are currently in progress can not be affected. See key term Trigger.

Returns true or raises an exception.

Options: :launch_configuration_name, :min_size, :max_size, :cooldown, :availability_zones. (Amazon’s notice: :availability_zones is reserved for future use.)

as.update_auto_scaling_group('CentOS.5.1-c', :min_size => 1, :max_size => 4) #=> true



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# File 'lib/as/right_as_interface.rb', line 205

def update_auto_scaling_group(auto_scaling_group_name, options={})
  request_hash = amazonize_list('AvailabilityZones.member', options[:availability_zones])
  request_hash['AutoScalingGroupName']    = auto_scaling_group_name
  request_hash['LaunchConfigurationName'] = options[:launch_configuration_name] if options[:launch_configuration_name]
  request_hash['MinSize']  = options[:min_size] if options[:min_size]
  request_hash['MaxSize']  = options[:max_size] if options[:max_size]
  request_hash['Cooldown'] = options[:cooldown] if options[:cooldown]
  link = generate_request("UpdateAutoScalingGroup", request_hash)
  request_info(link, RightHttp2xxParser.new(:logger => @logger))
end