You are viewing documentation for version 3 of the AWS SDK for Ruby. Version 2 documentation can be found here.

Class: Aws::AutoScaling::Instance

Inherits:
Object
  • Object
show all
Defined in:
gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb

Defined Under Namespace

Classes: Collection

Actions collapse

Associations collapse

Read-Only Attributes collapse

Instance Method Summary collapse

Constructor Details

#initialize(group_name, id, options = {}) ⇒ Instance #initialize(options = {}) ⇒ Instance

Returns a new instance of Instance

Overloads:

  • #initialize(group_name, id, options = {}) ⇒ Instance

    Parameters:

    • group_name (String)
    • id (String)

    Options Hash (options):

  • #initialize(options = {}) ⇒ Instance

    Options Hash (options):

    • :group_name (required, String)
    • :id (required, String)
    • :client (Client) 


21
22
23
24
25
26
27
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 21

def initialize(*args)
  options = Hash === args.last ? args.pop.dup : {}
  @group_name = extract_group_name(args, options)
  @id = extract_id(args, options)
  @data = options.delete(:data)
  @client = options.delete(:client) || Client.new(options)
end

Instance Method Details

#attach(options = {}) ⇒ EmptyStructure

Examples:

Request syntax with placeholder values


instance.attach()

Parameters:

  • options (Hash) (defaults to: {}) —

    ({})

Returns:

  • (EmptyStructure) 


221
222
223
224
225
226
227
228
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 221

def attach(options = {})
  options = Aws::Util.deep_merge(options,
    auto_scaling_group_name: @group_name,
    instance_ids: [@id]
  )
  resp = @client.attach_instances(options)
  resp.data
end

#availability_zone ⇒ String

The Availability Zone for the instance.

Returns:

  • (String) 


45
46
47
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 45

def availability_zone
  data[:availability_zone]
end

#client ⇒ Client

Returns:



87
88
89
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 87

def client
  @client
end

#data ⇒ Types::AutoScalingInstanceDetails

Returns the data for this Aws::AutoScaling::Instance. Calls Client#describe_auto_scaling_instances if #data_loaded? is false.

Returns:



107
108
109
110
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 107

def data
  load unless @data
  @data
end

#data_loaded? ⇒ Boolean

Returns true if this resource is loaded. Accessing attributes or #data on an unloaded resource will trigger a call to #load.

Returns:

  • (Boolean) —

    Returns true if this resource is loaded. Accessing attributes or #data on an unloaded resource will trigger a call to #load.



115
116
117
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 115

def data_loaded?
  !!@data
end

#detach(options = {}) ⇒ Activity::Collection

Examples:

Request syntax with placeholder values


activity = instance.detach({
  should_decrement_desired_capacity: false, # required
})

Parameters:

  • options (Hash) (defaults to: {}) —

    ({})

Options Hash (options):

  • :should_decrement_desired_capacity (required, Boolean) —

    Indicates whether the Auto Scaling group decrements the desired capacity value by the number of instances detached.

Returns:



240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 240

def detach(options = {})
  batch = []
  options = Aws::Util.deep_merge(options,
    auto_scaling_group_name: @group_name,
    instance_ids: [@id]
  )
  resp = @client.detach_instances(options)
  resp.data.activities.each do |a|
    batch << Activity.new(
      id: a.activity_id,
      data: a,
      client: @client
    )
  end
  Activity::Collection.new([batch], size: batch.size)
end

#enter_standby(options = {}) ⇒ Activity::Collection

Examples:

Request syntax with placeholder values


activity = instance.enter_standby({
  should_decrement_desired_capacity: false, # required
})

Parameters:

  • options (Hash) (defaults to: {}) —

    ({})

Options Hash (options):

  • :should_decrement_desired_capacity (required, Boolean) —

    Indicates whether to decrement the desired capacity of the Auto Scaling group by the number of instances moved to Standby mode.

Returns:



267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 267

def enter_standby(options = {})
  batch = []
  options = Aws::Util.deep_merge(options,
    auto_scaling_group_name: @group_name,
    instance_ids: [@id]
  )
  resp = @client.enter_standby(options)
  resp.data.activities.each do |a|
    batch << Activity.new(
      id: a.activity_id,
      data: a,
      client: @client
    )
  end
  Activity::Collection.new([batch], size: batch.size)
end

#exit_standby(options = {}) ⇒ Activity::Collection

Examples:

Request syntax with placeholder values


instance.exit_standby()

Parameters:

  • options (Hash) (defaults to: {}) —

    ({})

Returns:



289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 289

def exit_standby(options = {})
  batch = []
  options = Aws::Util.deep_merge(options,
    auto_scaling_group_name: @group_name,
    instance_ids: [@id]
  )
  resp = @client.exit_standby(options)
  resp.data.activities.each do |a|
    batch << Activity.new(
      id: a.activity_id,
      data: a,
      client: @client
    )
  end
  Activity::Collection.new([batch], size: batch.size)
end

#group ⇒ AutoScalingGroup

Returns:



356
357
358
359
360
361
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 356

def group
  AutoScalingGroup.new(
    name: @group_name,
    client: @client
  )
end

#group_name ⇒ String Also known as: auto_scaling_group_name

Returns:

  • (String) 


32
33
34
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 32

def group_name
  @group_name
end

#health_status ⇒ String

The last reported health status of this instance. "Healthy" means that the instance is healthy and should remain in service. "Unhealthy" means that the instance is unhealthy and Amazon EC2 Auto Scaling should terminate and replace it.

Returns:

  • (String) 


60
61
62
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 60

def health_status
  data[:health_status]
end

#id ⇒ String Also known as: instance_id

Returns:

  • (String) 


38
39
40
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 38

def id
  @id
end

#launch_configuration ⇒ LaunchConfiguration?

Returns:



364
365
366
367
368
369
370
371
372
373
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 364

def launch_configuration
  if data[:launch_configuration_name]
    LaunchConfiguration.new(
      name: data[:launch_configuration_name],
      client: @client
    )
  else
    nil
  end
end

#launch_configuration_name ⇒ String

The launch configuration used to launch the instance. This value is not available if you attached the instance to the Auto Scaling group.

Returns:

  • (String) 


67
68
69
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 67

def launch_configuration_name
  data[:launch_configuration_name]
end

#launch_template ⇒ Types::LaunchTemplateSpecification

The launch template for the instance.

Returns:



73
74
75
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 73

def launch_template
  data[:launch_template]
end

#lifecycle_state ⇒ String

The lifecycle state for the instance.

Returns:

  • (String) 


51
52
53
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 51

def lifecycle_state
  data[:lifecycle_state]
end

#load ⇒ self Also known as: reload

Loads, or reloads #data for the current Aws::AutoScaling::Instance. Returns self making it possible to chain methods.

instance.reload.data

Returns:

  • (self) 


97
98
99
100
101
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 97

def load
  resp = @client.describe_auto_scaling_instances(instance_ids: [@id])
  @data = resp.auto_scaling_instances[0]
  self
end

#protected_from_scale_in ⇒ Boolean

Indicates whether the instance is protected from termination by Amazon EC2 Auto Scaling when scaling in.

Returns:

  • (Boolean) 


80
81
82
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 80

def protected_from_scale_in
  data[:protected_from_scale_in]
end

#set_health(options = {}) ⇒ EmptyStructure

Examples:

Request syntax with placeholder values


instance.set_health({
  health_status: "XmlStringMaxLen32", # required
  should_respect_grace_period: false,
})

Parameters:

  • options (Hash) (defaults to: {}) —

    ({})

Options Hash (options):

  • :health_status (required, String) —

    The health status of the instance. Set to Healthy to have the instance remain in service. Set to Unhealthy to have the instance be out of service. Amazon EC2 Auto Scaling terminates and replaces the unhealthy instance.

  • :should_respect_grace_period (Boolean) —

    If the Auto Scaling group of the specified instance has a HealthCheckGracePeriod specified for the group, by default, this call respects the grace period. Set this to False, to have the call not respect the grace period associated with the group.

    For more information about the health check grace period, see CreateAutoScalingGroup.

Returns:

  • (EmptyStructure) 


327
328
329
330
331
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 327

def set_health(options = {})
  options = options.merge(instance_id: @id)
  resp = @client.set_instance_health(options)
  resp.data
end

#terminate(options = {}) ⇒ Activity

Examples:

Request syntax with placeholder values


activity = instance.terminate({
  should_decrement_desired_capacity: false, # required
})

Parameters:

  • options (Hash) (defaults to: {}) —

    ({})

Options Hash (options):

  • :should_decrement_desired_capacity (required, Boolean) —

    Indicates whether terminating the instance also decrements the size of the Auto Scaling group.

Returns:



343
344
345
346
347
348
349
350
351
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 343

def terminate(options = {})
  options = options.merge(instance_id: @id)
  resp = @client.terminate_instance_in_auto_scaling_group(options)
  Activity.new(
    id: resp.data.activity.activity_id,
    data: resp.data.activity,
    client: @client
  )
end

#wait_until(options = {}, &block) ⇒ Resource

Deprecated.

Use [Aws::AutoScaling::Client] #wait_until instead

Note:

The waiting operation is performed on a copy. The original resource remains unchanged

Waiter polls an API operation until a resource enters a desired state.

Basic Usage

Waiter will polls until it is successful, it fails by entering a terminal state, or until a maximum number of attempts are made.

# polls in a loop until condition is true
resource.wait_until(options) {|resource| condition}

Example

instance.wait_until(max_attempts:10, delay:5) {|instance| instance.state.name == 'running' }

Configuration

You can configure the maximum number of polling attempts, and the delay (in seconds) between each polling attempt. The waiting condition is set by passing a block to #wait_until:

# poll for ~25 seconds
resource.wait_until(max_attempts:5,delay:5) {|resource|...}

Callbacks

You can be notified before each polling attempt and before each delay. If you throw :success or :failure from these callbacks, it will terminate the waiter.

started_at = Time.now
# poll for 1 hour, instead of a number of attempts
proc = Proc.new do |attempts, response|
  throw :failure if Time.now - started_at > 3600
end

  # disable max attempts
instance.wait_until(before_wait:proc, max_attempts:nil) {...}

Handling Errors

When a waiter is successful, it returns the Resource. When a waiter fails, it raises an error.

begin
  resource.wait_until(...)
rescue Aws::Waiters::Errors::WaiterFailed
  # resource did not enter the desired state in time
end

attempts attempt in seconds invoked before each attempt invoked before each wait

Parameters:

  • options (Hash) (defaults to: {}) —

    a customizable set of options

Options Hash (options):

  • :max_attempts (Integer) — default: 10 —

    Maximum number of

  • :delay (Integer) — default: 10 —

    Delay between each

  • :before_attempt (Proc) — default: nil —

    Callback

  • :before_wait (Proc) — default: nil —

    Callback

Returns:

  • (Resource) —

    if the waiter was successful

Raises:

  • (Aws::Waiters::Errors::FailureStateError) —

    Raised when the waiter terminates because the waiter has entered a state that it will not transition out of, preventing success.

    yet successful.

  • (Aws::Waiters::Errors::UnexpectedError) —

    Raised when an error is encountered while polling for a resource that is not expected.

  • (NotImplementedError) —

    Raised when the resource does not



197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
 
# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 197

def wait_until(options = {}, &block)
  self_copy = self.dup
  attempts = 0
  options[:max_attempts] = 10 unless options.key?(:max_attempts)
  options[:delay] ||= 10
  options[:poller] = Proc.new do
    attempts += 1
    if block.call(self_copy)
      [:success, self_copy]
    else
      self_copy.reload unless attempts == options[:max_attempts]
      :retry
    end
  end
  Aws::Waiters::Waiter.new(options).wait({})
end