baiji v0.6.7 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 policies
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
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.
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.
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.
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.
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.
This policy is similar to the policy created by
CreateLBCookieStickinessPolicy
, except that the lifetime of the special
Elastic Load Balancing cookie, AWSELB
, follows the lifetime of the
application-generated cookie specified in the policy configuration. The
load balancer only inserts a new stickiness cookie when the application
response includes a new application cookie.
If the application cookie is explicitly removed or expires, the session stops being sticky until a new application cookie is issued.
For more information, see Application-Controlled Session Stickiness in the Classic Load Balancer Guide.
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.
When a load balancer implements this policy, the load balancer uses a special cookie to track the instance for each request. When the load balancer receives a request, it first checks to see if this cookie is present in the request. If so, the load balancer sends the request to the application server specified in the cookie. If not, the load balancer sends the request to a server that is chosen based on the existing load-balancing algorithm.
A cookie is inserted into the response for binding subsequent requests from the same user to that server. The validity of the cookie is based on the cookie expiration time, which is specified in the policy configuration.
For more information, see Duration-Based Session Stickiness in the Classic Load Balancer Guide.
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.
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.
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.
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.
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.
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.
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.
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 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.
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.
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.
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.
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.
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.
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)
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.
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.
For more information about updating your SSL certificate, see Replace the SSL Certificate for Your Load Balancer in the Classic Load Balancer Guide.
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.
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.