baiji v0.6.11 Baiji.ElasticLoadBalancing

Elastic Load Balancing

A load balancer distributes incoming traffic across your EC2 instances. This enables you to increase the availability of your application. The load balancer also monitors the health of its registered instances and ensures that it routes traffic only to healthy instances. You configure your load balancer to accept incoming traffic by specifying one or more listeners, which are configured with a protocol and port number for connections from clients to the load balancer and a protocol and port number for connections from the load balancer to the instances.

Elastic Load Balancing supports two types of load balancers: Classic Load Balancers and Application Load Balancers (new). A Classic Load Balancer makes routing and load balancing decisions either at the transport layer (TCP/SSL) or the application layer (HTTP/HTTPS), and supports either EC2-Classic or a VPC. An Application Load Balancer makes routing and load balancing decisions at the application layer (HTTP/HTTPS), supports path-based routing, and can route requests to one or more ports on each EC2 instance or container instance in your virtual private cloud (VPC). For more information, see the Elastic Load Balancing User Guide.

This reference covers the 2012-06-01 API, which supports Classic Load Balancers. The 2015-12-01 API supports Application Load Balancers.

To get started, create a load balancer with one or more listeners using CreateLoadBalancer. Register your instances with the load balancer using RegisterInstancesWithLoadBalancer.

All Elastic Load Balancing operations are idempotent, which means that they complete at most one time. If you repeat an operation, it succeeds with a 200 OK response code.

Link to this section Summary

Functions

Returns a map containing the input/output shapes for this endpoint

Outputs values common to all actions

Adds the specified tags to the specified load balancer. Each load balancer can have a maximum of 10 tags

Associates one or more security groups with your load balancer in a virtual private cloud (VPC). The specified security groups override the previously associated security groups

Adds one or more subnets to the set of configured subnets for the specified load balancer

Specifies the health check settings to use when evaluating the health state of your EC2 instances

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

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

Creates a Classic Load Balancer

Creates one or more listeners for the specified load balancer. If a listener with the specified port does not already exist, it is created; otherwise, the properties of the new listener must match the properties of the existing listener

Creates a policy with the specified attributes for the specified load balancer

Deletes the specified load balancer

Deletes the specified listeners from the specified load balancer

Deletes the specified policy from the specified load balancer. This policy must not be enabled for any listeners

Deregisters the specified instances from the specified load balancer. After the instance is deregistered, it no longer receives traffic from the load balancer

Describes the current Elastic Load Balancing resource limits for your AWS account

Describes the state of the specified instances with respect to the specified load balancer. If no instances are specified, the call describes the state of all instances that are currently registered with the load balancer. If instances are specified, their state is returned even if they are no longer registered with the load balancer. The state of terminated instances is not returned

Describes the attributes for the specified load balancer

Describes the specified load balancer policy types or all load balancer policy types

Describes the specified the load balancers. If no load balancers are specified, the call describes all of your load balancers

Describes the tags associated with the specified load balancers

Removes the specified subnets from the set of configured subnets for the load balancer

Removes the specified Availability Zones from the set of Availability Zones for the specified load balancer

Adds the specified Availability Zones to the set of Availability Zones for the specified load balancer

Modifies the attributes of the specified load balancer

Adds the specified instances to the specified load balancer

Removes one or more tags from the specified load balancer

Sets the certificate that terminates the specified listener’s SSL connections. The specified certificate replaces any prior certificate that was used on the same load balancer and port

Replaces the set of policies associated with the specified port on which the EC2 instance is listening with a new set of policies. At this time, only the back-end server authentication policy type can be applied to the instance ports; this policy type is composed of multiple public key policies

Replaces the current set of policies for the specified load balancer port with the specified set of policies

Link to this section Functions

Returns a map containing the input/output shapes for this endpoint

Outputs values common to all actions

Link to this function add_tags(input \\ %{}, options \\ [])

Adds the specified tags to the specified load balancer. Each load balancer can have a maximum of 10 tags.

Each tag consists of a key and an optional value. If a tag with the same key is already associated with the load balancer, AddTags updates its value.

For more information, see Tag Your Classic Load Balancer in the Classic Load Balancer Guide.

Link to this function apply_security_groups_to_load_balancer(input \\ %{}, options \\ [])

Associates one or more security groups with your load balancer in a virtual private cloud (VPC). The specified security groups override the previously associated security groups.

For more information, see Security Groups for Load Balancers in a VPC in the Classic Load Balancer Guide.

Link to this function attach_load_balancer_to_subnets(input \\ %{}, options \\ [])

Adds one or more subnets to the set of configured subnets for the specified load balancer.

The load balancer evenly distributes requests across all registered subnets. For more information, see Add or Remove Subnets for Your Load Balancer in a VPC in the Classic Load Balancer Guide.

Link to this function configure_health_check(input \\ %{}, options \\ [])

Specifies the health check settings to use when evaluating the health state of your EC2 instances.

For more information, see Configure Health Checks for Your Load Balancer in the Classic Load Balancer Guide.

Link to this function create_load_balancer(input \\ %{}, options \\ [])

Creates a Classic Load Balancer.

You can add listeners, security groups, subnets, and tags when you create your load balancer, or you can add them later using CreateLoadBalancerListeners, ApplySecurityGroupsToLoadBalancer, AttachLoadBalancerToSubnets, and AddTags.

To describe your current load balancers, see DescribeLoadBalancers. When you are finished with a load balancer, you can delete it using DeleteLoadBalancer.

You can create up to 20 load balancers per region per account. You can request an increase for the number of load balancers for your account. For more information, see Limits for Your Classic Load Balancer in the Classic Load Balancer Guide.

Link to this function create_load_balancer_listeners(input \\ %{}, options \\ [])

Creates one or more listeners for the specified load balancer. If a listener with the specified port does not already exist, it is created; otherwise, the properties of the new listener must match the properties of the existing listener.

For more information, see Listeners for Your Classic Load Balancer in the Classic Load Balancer Guide.

Link to this function create_load_balancer_policy(input \\ %{}, options \\ [])

Creates a policy with the specified attributes for the specified load balancer.

Policies are settings that are saved for your load balancer and that can be applied to the listener or the application server, depending on the policy type.

Link to this function delete_load_balancer(input \\ %{}, options \\ [])

Deletes the specified load balancer.

If you are attempting to recreate a load balancer, you must reconfigure all settings. The DNS name associated with a deleted load balancer are no longer usable. The name and associated DNS record of the deleted load balancer no longer exist and traffic sent to any of its IP addresses is no longer delivered to your instances.

If the load balancer does not exist or has already been deleted, the call to DeleteLoadBalancer still succeeds.

Link to this function delete_load_balancer_listeners(input \\ %{}, options \\ [])

Deletes the specified listeners from the specified load balancer.

Link to this function delete_load_balancer_policy(input \\ %{}, options \\ [])

Deletes the specified policy from the specified load balancer. This policy must not be enabled for any listeners.

Link to this function deregister_instances_from_load_balancer(input \\ %{}, options \\ [])

Deregisters the specified instances from the specified load balancer. After the instance is deregistered, it no longer receives traffic from the load balancer.

You can use DescribeLoadBalancers to verify that the instance is deregistered from the load balancer.

For more information, see Register or De-Register EC2 Instances in the Classic Load Balancer Guide.

Link to this function describe_account_limits(input \\ %{}, options \\ [])

Describes the current Elastic Load Balancing resource limits for your AWS account.

For more information, see Limits for Your Classic Load Balancer in the Classic Load Balancer Guide.

Link to this function describe_instance_health(input \\ %{}, options \\ [])

Describes the state of the specified instances with respect to the specified load balancer. If no instances are specified, the call describes the state of all instances that are currently registered with the load balancer. If instances are specified, their state is returned even if they are no longer registered with the load balancer. The state of terminated instances is not returned.

Link to this function describe_load_balancer_attributes(input \\ %{}, options \\ [])

Describes the attributes for the specified load balancer.

Link to this function describe_load_balancer_policies(input \\ %{}, options \\ [])

Describes the specified policies.

If you specify a load balancer name, the action returns the descriptions of all policies created for the load balancer. If you specify a policy name associated with your load balancer, the action returns the description of that policy. If you don’t specify a load balancer name, the action returns descriptions of the specified sample policies, or descriptions of all sample policies. The names of the sample policies have the ELBSample- prefix.

Link to this function describe_load_balancer_policy_types(input \\ %{}, options \\ [])

Describes the specified load balancer policy types or all load balancer policy types.

The description of each type indicates how it can be used. For example, some policies can be used only with layer 7 listeners, some policies can be used only with layer 4 listeners, and some policies can be used only with your EC2 instances.

You can use CreateLoadBalancerPolicy to create a policy configuration for any of these policy types. Then, depending on the policy type, use either SetLoadBalancerPoliciesOfListener or SetLoadBalancerPoliciesForBackendServer to set the policy.

Link to this function describe_load_balancers(input \\ %{}, options \\ [])

Describes the specified the load balancers. If no load balancers are specified, the call describes all of your load balancers.

Link to this function describe_tags(input \\ %{}, options \\ [])

Describes the tags associated with the specified load balancers.

Link to this function detach_load_balancer_from_subnets(input \\ %{}, options \\ [])

Removes the specified subnets from the set of configured subnets for the load balancer.

After a subnet is removed, all EC2 instances registered with the load balancer in the removed subnet go into the OutOfService state. Then, the load balancer balances the traffic among the remaining routable subnets.

Link to this function disable_availability_zones_for_load_balancer(input \\ %{}, options \\ [])

Removes the specified Availability Zones from the set of Availability Zones for the specified load balancer.

There must be at least one Availability Zone registered with a load balancer at all times. After an Availability Zone is removed, all instances registered with the load balancer that are in the removed Availability Zone go into the OutOfService state. Then, the load balancer attempts to equally balance the traffic among its remaining Availability Zones.

For more information, see Add or Remove Availability Zones in the Classic Load Balancer Guide.

Link to this function enable_availability_zones_for_load_balancer(input \\ %{}, options \\ [])

Adds the specified Availability Zones to the set of Availability Zones for the specified load balancer.

The load balancer evenly distributes requests across all its registered Availability Zones that contain instances.

For more information, see Add or Remove Availability Zones in the Classic Load Balancer Guide.

Link to this function modify_load_balancer_attributes(input \\ %{}, options \\ [])

Modifies the attributes of the specified load balancer.

You can modify the load balancer attributes, such as AccessLogs, ConnectionDraining, and CrossZoneLoadBalancing by either enabling or disabling them. Or, you can modify the load balancer attribute ConnectionSettings by specifying an idle connection timeout value for your load balancer.

For more information, see the following in the Classic Load Balancer Guide:

  • [Cross-Zone Load Balancing](http://docs.aws.amazon.com/elasticloadbalancing/latest/classic/enable-disable-crosszone-lb.html)
  • [Connection Draining](http://docs.aws.amazon.com/elasticloadbalancing/latest/classic/config-conn-drain.html)
  • [Access Logs](http://docs.aws.amazon.com/elasticloadbalancing/latest/classic/access-log-collection.html)
  • [Idle Connection Timeout](http://docs.aws.amazon.com/elasticloadbalancing/latest/classic/config-idle-timeout.html)
Link to this function register_instances_with_load_balancer(input \\ %{}, options \\ [])

Adds the specified instances to the specified load balancer.

The instance must be a running instance in the same network as the load balancer (EC2-Classic or the same VPC). If you have EC2-Classic instances and a load balancer in a VPC with ClassicLink enabled, you can link the EC2-Classic instances to that VPC and then register the linked EC2-Classic instances with the load balancer in the VPC.

Note that RegisterInstanceWithLoadBalancer completes when the request has been registered. Instance registration takes a little time to complete. To check the state of the registered instances, use DescribeLoadBalancers or DescribeInstanceHealth.

After the instance is registered, it starts receiving traffic and requests from the load balancer. Any instance that is not in one of the Availability Zones registered for the load balancer is moved to the OutOfService state. If an Availability Zone is added to the load balancer later, any instances registered with the load balancer move to the InService state.

To deregister instances from a load balancer, use DeregisterInstancesFromLoadBalancer.

For more information, see Register or De-Register EC2 Instances in the Classic Load Balancer Guide.

Link to this function remove_tags(input \\ %{}, options \\ [])

Removes one or more tags from the specified load balancer.

Link to this function set_load_balancer_listener_s_s_l_certificate(input \\ %{}, options \\ [])

Sets the certificate that terminates the specified listener’s SSL connections. The specified certificate replaces any prior certificate that was used on the same load balancer and port.

For more information about updating your SSL certificate, see Replace the SSL Certificate for Your Load Balancer in the Classic Load Balancer Guide.

Link to this function set_load_balancer_policies_for_backend_server(input \\ %{}, options \\ [])

Replaces the set of policies associated with the specified port on which the EC2 instance is listening with a new set of policies. At this time, only the back-end server authentication policy type can be applied to the instance ports; this policy type is composed of multiple public key policies.

Each time you use SetLoadBalancerPoliciesForBackendServer to enable the policies, use the PolicyNames parameter to list the policies that you want to enable.

You can use DescribeLoadBalancers or DescribeLoadBalancerPolicies to verify that the policy is associated with the EC2 instance.

For more information about enabling back-end instance authentication, see Configure Back-end Instance Authentication in the Classic Load Balancer Guide. For more information about Proxy Protocol, see Configure Proxy Protocol Support in the Classic Load Balancer Guide.

Link to this function set_load_balancer_policies_of_listener(input \\ %{}, options \\ [])

Replaces the current set of policies for the specified load balancer port with the specified set of policies.

To enable back-end server authentication, use SetLoadBalancerPoliciesForBackendServer.

For more information about setting policies, see Update the SSL Negotiation Configuration, Duration-Based Session Stickiness, and Application-Controlled Session Stickiness in the Classic Load Balancer Guide.