Lincoln D. Stein > VM-EC2-1.23 > VM::EC2::ELB

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NAME ^

VM::EC2::ELB -- Object describing an Elastic Load Balancer

SYNOPSIS ^

  use VM::EC2;

  $ec2       = VM::EC2->new(...);
  $lb = $ec2->create_load_balancer(%args);
    or
  $lb = $ec2->describe_load_balancers(-load_balancer_name=>'my-lb');

  @zones        = $lb->AvailabilityZones;
  $created      = $lb->CreatedTime;
  $dns_name     = $lb->DNSName;
  $health_check = $lb->HealthCheck;
  @instances    = $lb->Instances;
  @list_desc    = $lb->ListenerDescriptions;
  $name         = $lb->LoadBalancerName;
  @policies_obj = $lb->Policies;
  @policies     = $lb->describe_policies(-policy_names=>'mypolicy'); 
  $scheme       = $lb->Scheme;
  $sg_name      = $lb->SourceSecurityGroup;
  $success      = $lb->create_load_balancer_listeners(%args);
  $success      = $lb->enable_availability_zones_for_load_balancer(@zones);
  @list         = $lb->register_instances_with_load_balancer(-instances => 'i-12345678');
  $state        = $lb->describe_instance_health(-instances => 'i-12345678')
  $success      = $lb->delete_load_balancer;

DESCRIPTION ^

This object represents an Amazon Elastic Load Balancer and is returned by VM::EC2->describe_load_balancers() and VM::EC2->create_load_balancer(). In addition to methods to query the ELB's attributes, there are methods that manage the ELB's lifecycle and properties.

METHODS ^

The following object methods are supported:

 AvailabilityZones         -- The enabled availability zones for the ELB in the
                              form of an array of L<VM::EC2::AvailabilityZone>
                              objects.
 BackendServerDescriptions -- The backend server descriptions.
 CreatedTime               -- The creation date of the ELB.
 DNSName                   -- The DNS name of the ELB.
 HealthCheck               -- The health check associated with the ELB in the
                              form of a L<VM::EC2::ELB::HealthCheck> object.
 Instances                 -- The instances that the ELB points to, in the form
                              of an array of L<VM::EC2::Instance> objects.
 ListenerDescriptions      -- An array of L<VM::EC2::ELB::ListenerDescription>
                              objects.
 LoadBalancerName          -- The name of the ELB
 Policies                  -- The policies of the ELB in the form of a
                              L<VM::EC2::ELB::Policies> object.
 Scheme                    -- Specifies the type of ELB ('internal' is for VPC
                              only.)
 SecurityGroups            -- The security groups the ELB is a member of (VPC
                              only) in the form of L<VM::EC2::SecurityGroup>
                              objects.
 SourceSecurityGroup       -- The security group that the ELB is a member of
 Subnets                   -- Provides an array of VPC subnet objects
                              (L<VM::EC2::VPC::Subnet>) that the ELB is part of.
 VPCId                     -- Provides the ID of the VPC attached to the ELB.

"Unimplemented/untested" object methods related to Route 53 (return raw data/ data structures):

 CanonicalHostedZoneName   -- The name of the Amazon Route 53 hosted zone that
                              is associated with the ELB.
 CanonicalHostedZoneNameID -- The ID of the Amazon Route 53 hosted zone name
                              that is associated with the ELB.

The following convenience methods are supported;

 active_policies           -- Returns the policies that are actively in use by
                              the ELB in the form of L<VM::EC2::ELB::PolicyDescription>
                              objects.
 all_policies              -- Returns all policies that are associated with the
                              ELB in the form of L<VM::EC2::ELB::PolicyDescription>
                              objects.
 listeners                 -- Provides the L<VM::EC2::ELB::Listener> objects
                              associated with the ELB

LIFECYCLE METHODS ^

$success = $elb->delete_load_balancer =head2 $success = $elb->delete

This method deletes the ELB. Returns true on success.

$success = $elb->create_app_cookie_stickiness_policy(-cookie_name=>$cookie_name,-policy_name=>$policy_name)

Generates a stickiness policy with sticky session lifetimes that follow that of an application-generated cookie. This policy can be associated only with HTTP/HTTPS listeners. Returns true on success.

$success = $elb->create_lb_cookie_stickiness_policy(-cookie_expiration_period=>$secs,-policy_name=>$name)

Generates a stickiness policy with sticky session lifetimes controlled by the lifetime of the browser (user-agent) or a specified expiration period. This policy can be associated only with HTTP/HTTPS listeners. Returns true on success.

$success = $elb->create_load_balancer_listeners(-listeners=>\%listener_hash); =head2 $success = $elb->create_listeners(\%listener_hash);

Creates one or more listeners on a ELB for the specified port. If a listener with the given port does not already exist, it will be created; otherwise, the properties of the new listener must match the properties of the existing listener. Returns true on success.

The passed argument must either be a VM::EC2::ELB:Listener object (or arrayref of objects) or a hash (or arrayref of hashes) containing the following keys:

 Protocol            -- Value as one of: HTTP, HTTPS, TCP, or SSL
 LoadBalancerPort    -- Value in range 1-65535
 InstancePort        -- Value in range 1-65535
  and optionally:
 InstanceProtocol    -- Value as one of: HTTP, HTTPS, TCP, or SSL
 SSLCertificateId    -- Certificate ID from AWS IAM certificate list

$success = $elb->delete_load_balancer_listeners(-load_balancer_ports=>\@ports) =head2 $success = $elb->delete_listeners(@ports)

Deletes listeners from the ELB for the specified port. Returns true on success.

@zones = $elb->disable_availability_zones_for_load_balancer(-zones=>\@zones) =head2 @zones = $elb->disable_availability_zones(@zones) =head2 @zones = $elb->disable_zones(@zones)

Removes the specified EC2 Availability Zones from the set of configured Availability Zones for the ELB. Returns a series of VM::EC2::AvailabilityZone objects now associated with the ELB.

@zones = $elb->enable_availability_zones_for_load_balancer(-zones=>\@zones) =head2 @zones = $elb->enable_availability_zones(@zones) =head2 @zones = $elb->enable_zones(@zones)

Adds the specified EC2 Availability Zones to the set of configured Availability Zones for the ELB. Returns a series of VM::EC2::AvailabilityZone objects now associated with the ELB.

@instance_ids = $elb->register_instances_with_load_balancer(-instances=>\@instance_ids) =head2 @instance_ids = $elb->register_instances(@instance_ids)

Adds new instances to the ELB. If the instance is in an availability zone that is not registered with the ELB will be in the OutOfService state. Once the zone is added to the ELB the instance will go into the InService state. Returns an array of instance IDs now associated with the ELB.

@instance_ids = $elb->deregister_instances_from_load_balancer(-instances=>\@instance_ids) =head2 @instance_ids = $elb->deregister_instances(@instance_ids)

Deregisters instances from the ELB. Once the instance is deregistered, it will stop receiving traffic from the ELB. Returns an array of instance IDs now associated with the ELB.

@states = $elb->describe_instance_health(-instances=>\@instance_ids) =head2 @states = $elb->describe_instance_health(@instance_ids)

Provides the current state of the instances of the specified LoadBalancer. If no instances are specified, the state of all the instances for the ELB is returned. Returns an array of VM::EC2::ELB::InstanceState objects.

$success = $elb->create_load_balancer_policy(-policy_name=>$name,-policy_type_name=>$type_name,-policy_attributes=>\@attrs) =head2 $success = $elb->create_policy(-policy_name=>$name,-policy_type_name=>$type_name,-policy_attributes=>\@attrs)

Creates a new policy that contains the necessary attributes depending on the policy type. Policies are settings that are saved for your ELB and that can be applied to the front-end listener, or the back-end application server, depending on your policy type. Returns true on success.

$success = $elb->delete_load_balancer_policy(-policy_name=>$policy_name) =head2 $success = $elb->delete_policy($policy_name)

Deletes a policy from the ELB. The specified policy must not be enabled for any listeners. Returns true on success.

CONFIGURATION METHODS ^

$health_check = $elb->configure_health_check(-healthy_threshold=>$cnt,-interval=>$secs,-target=>$target,-timeout=>$secs,-unhealthy_threshold=>$cnt)

This method configures the health check for a particular target service.

-target must be in the format Protocol:Port[/PathToPing]: - Valid Protocol types are: HTTP, HTTPS, TCP, SSL - Port must be in range 0-65535 - PathToPing is only applicable to HTTP or HTTPS protocol types and must be 1024 characters long or fewer.

 ex: HTTP:80/index.html

$success = $elb->create_policy(-policy_name=>$name,-policy_type_name=>$type_name)

Creates a new policy that contains the necessary attributes depending on the policy type. Returns true on success.

$success = $elb->set_load_balancer_listener_ssl_certificate(-port=>$port,-cert_id=>$cert_id)

Sets the certificate that terminates the specified listener's SSL connections. The specified certificate replaces any prior certificate that was used on the same ELB and port. Returns true on success.

$success = $elb->set_load_balancer_policies_of_listener(-port=>$port,-policy_names=>\@names) =head2 $success = $elb->set_policies_of_listener(-port=>$port,-policy_names=>\@names)

Associates, updates, or disables a policy with a listener on the ELB. Multiple policies may be associated with a listener. Returns true on success.

@groups = $elb->apply_security_groups_to_load_balancer(-security_groups=>\@groups) =head2 @groups = $elb->apply_security_groups(@groups)

Associates one or more security groups with your ELB in VPC. The provided security group IDs will override any currently applied security groups. Returns a list of VM::EC2::SecurityGroup objects.

@subnets = $elb->attach_load_balancer_to_subnets(-subnets=>\@subnets) =head2 @subnets = $elb->attach_to_subnets(@subnets)

Adds one or more subnets to the set of configured subnets for the ELB. Returns a series of VM::EC2::VPC::Subnet objects corresponding to the subnets the ELB is now attached to.

@subnets = $elb->detach_load_balancer_from_subnets(-subnets=>\@subnets) =head2 @subnets = $elb->detach_from_subnets(@subnets)

Removes subnets from the set of configured subnets in the VPC for the ELB. Returns a series of VM::EC2::VPC::Subnet objects corresponding to the subnets the ELB is now attached to.

$success = $elb->set_load_balancer_policies_for_backend_server(-port=>$port,-policy_names=>$names) =head2 $success = $elb->set_policies_for_backend_server(-port=>$port,-policy_names=>$names)

Replaces the current set of policies associated with a port on which the back- end server is listening with a new set of policies. After the policies have been created, they can be applied here as a list. At this time, only the back- end server authentication policy type can be applied to the back-end ports; this policy type is composed of multiple public key policies. Returns true on success.

INFORMATION METHODS ^

$state = $lb->describe_instance_health(-instances=>\@instances) =head2 $state = $lb->describe_instance_health(@instances) =head2 $state = $lb->describe_instance_health

Returns the current state of the instances registered with the ELB.

@policies = $lb->describe_load_balancer_policies(-policy_names=>\@names) =head2 @policies = $lb->describe_load_balancer_policies;

STRING OVERLOADING ^

When used in a string context, this object will interpolate the Elastic Load Balancer Name.

SEE ALSO ^

VM::EC2 VM::EC2::Generic VM::EC2::ELB::HealthCheck VM::EC2::ELB::ListenerDescription VM::EC2::ELB::BackendServerDescription VM::EC2::ELB::Policies

AUTHOR ^

Lance Kinley <lkinley@loyaltymethods.com>.

Copyright (c) 2012 Loyalty Methods, Inc.

This package and its accompanying libraries is free software; you can redistribute it and/or modify it under the terms of the GPL (either version 1, or at your option, any later version) or the Artistic License 2.0. Refer to LICENSE for the full license text. In addition, please see DISCLAIMER.txt for disclaimers of warranty.

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