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

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_list, #cache_hits?, caching, caching=, #caching?, #destroy_connection, #generate_request_impl, #get_connection, #get_connections_storage, #get_server_url, #init, #on_exception, #request_cache_or_info, #request_info_impl, #signed_service_params, #update_cache

Methods inherited from RightAwsBase

amazon_problems, amazon_problems=

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

  • :multi_thread: true=HTTP connection per thread, false=per process

  • :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



103
104
105
106
107
108
109
110
111
112
113
# File 'lib/as/right_as_interface.rb', line 103

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_serviceObject



87
88
89
# File 'lib/as/right_as_interface.rb', line 87

def self.bench_service
  @@bench.service
end

.bench_xmlObject



84
85
86
# 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



152
153
154
155
156
157
158
159
160
161
162
163
164
165
# File 'lib/as/right_as_interface.rb', line 152

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


354
355
356
357
358
359
360
361
362
363
364
365
366
# File 'lib/as/right_as_interface.rb', line 354

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].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].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


474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
# File 'lib/as/right_as_interface.rb', line 474

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.



170
171
172
173
# File 'lib/as/right_as_interface.rb', line 170

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


441
442
443
444
# File 'lib/as/right_as_interface.rb', line 441

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


527
528
529
530
531
# File 'lib/as/right_as_interface.rb', line 527

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.



135
136
137
138
139
140
# File 'lib/as/right_as_interface.rb', line 135

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.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=>""}, ...]


385
386
387
388
389
390
391
392
# File 'lib/as/right_as_interface.rb', line 385

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}]}


246
247
248
249
250
251
252
253
# File 'lib/as/right_as_interface.rb', line 246

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}]


517
518
519
520
# File 'lib/as/right_as_interface.rb', line 517

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:



115
116
117
# File 'lib/as/right_as_interface.rb', line 115

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


420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
# File 'lib/as/right_as_interface.rb', line 420

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].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


293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
# File 'lib/as/right_as_interface.rb', line 293

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].blank?
  end
  last_response
end

#request_info(request, parser) ⇒ Object

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



121
122
123
# File 'lib/as/right_as_interface.rb', line 121

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


184
185
186
187
188
# File 'lib/as/right_as_interface.rb', line 184

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.



322
323
324
325
326
327
# File 'lib/as/right_as_interface.rb', line 322

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


206
207
208
209
210
211
212
213
214
215
# File 'lib/as/right_as_interface.rb', line 206

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