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

Read-Only Attributes collapse

Actions collapse

Associations 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)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 24

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)
  @waiter_block_warned = false
end

Instance Method Details

#attach(options = {}) ⇒ EmptyStructure

Examples:

Request syntax with placeholder values


instance.attach()

Parameters:

  • options (Hash) (defaults to: {})

    ({})

Returns:

  • (EmptyStructure)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 257

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_zoneString

The Availability Zone for the instance.

Returns:

  • (String)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 55

def availability_zone
  data[:availability_zone]
end

#clientClient

Returns:



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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 121

def client
  @client
end

#dataTypes::AutoScalingInstanceDetails



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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 141

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.



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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 149

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:



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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 276

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:



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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 303

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:



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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 325

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

#groupAutoScalingGroup

Returns:



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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 397

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

#group_nameString Also known as: auto_scaling_group_name

Returns:

  • (String)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 36

def group_name
  @group_name
end

#health_statusString

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)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 85

def health_status
  data[:health_status]
end

#idString Also known as: instance_id

Returns:

  • (String)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 42

def id
  @id
end

#instance_typeString

The instance type of the EC2 instance.

Returns:

  • (String)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 49

def instance_type
  data[:instance_type]
end

#launch_configurationLaunchConfiguration?

Returns:



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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 405

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

#launch_configuration_nameString

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)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 92

def launch_configuration_name
  data[:launch_configuration_name]
end

#launch_templateTypes::LaunchTemplateSpecification

The launch template for the instance.



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

def launch_template
  data[:launch_template]
end

#lifecycle_stateString

The lifecycle state for the instance. The Quarantined state is not used. For information about lifecycle states, see Instance lifecycle in the Amazon EC2 Auto Scaling User Guide.

Valid Values: Pending | Pending:Wait | Pending:Proceed | Quarantined | InService | Terminating | Terminating:Wait | Terminating:Proceed | Terminated | Detaching | Detached | EnteringStandby | Standby | Warmed:Pending | Warmed:Pending:Wait | Warmed:Pending:Proceed | Warmed:Terminating | Warmed:Terminating:Wait | Warmed:Terminating:Proceed | Warmed:Terminated | Warmed:Stopped | Warmed:Running

Returns:

  • (String)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 76

def lifecycle_state
  data[:lifecycle_state]
end

#loadself 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)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 131

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

#protected_from_scale_inBoolean

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

Returns:

  • (Boolean)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 105

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 in the Amazon EC2 Auto Scaling API Reference.

Returns:

  • (EmptyStructure)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 368

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:



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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 384

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 = {}) {|resource| ... } ⇒ 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) do |instance|
  instance.state.name == 'running'
end

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

Yield Parameters:

  • resource (Resource)

    to be used in the waiting condition.

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



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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 233

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

#weighted_capacityString

The number of capacity units contributed by the instance based on its instance type.

Valid Range: Minimum value of 1. Maximum value of 999.

Returns:

  • (String)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/instance.rb', line 114

def weighted_capacity
  data[:weighted_capacity]
end