describe-load-balancers¶

Description¶

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

Synopsis¶

  describe-load-balancers
[--load-balancer-names <value>]
[--page-size <value>]
[--cli-input-json | --cli-input-yaml]
[--starting-token <value>]
[--max-items <value>]
[--generate-cli-skeleton <value>]

Options¶

--load-balancer-names (list)

The names of the load balancers.

(string)

Syntax:

"string" "string" ...

--page-size (integer)

The size of each page to get in the AWS service call. This does not affect the number of items returned in the command’s output. Setting a smaller page size results in more calls to the AWS service, retrieving fewer items in each call. This can help prevent the AWS service calls from timing out.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--cli-input-json | --cli-input-yaml (string) Reads arguments from the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, those values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally. This may not be specified along with --cli-input-yaml.

--starting-token (string)

A token to specify where to start paginating. This is the NextToken from a previously truncated response.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--max-items (integer)

The total number of items to return in the command’s output. If the total number of items available is more than the value specified, a NextToken is provided in the command’s output. To resume pagination, provide the NextToken value in the starting-token argument of a subsequent command. Do not use the NextToken response element directly outside of the AWS CLI.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. Similarly, if provided yaml-input it will print a sample input YAML that can be used with --cli-input-yaml. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command. The generated JSON skeleton is not stable between versions of the AWS CLI and there are no backwards compatibility guarantees in the JSON skeleton generated.

See ‘aws help’ for descriptions of global parameters.

Examples¶

Note

To use the following examples, you must have the AWS CLI installed and configured. See the Getting started guide in the AWS CLI User Guide for more information.

Unless otherwise stated, all examples have unix-like quotation rules. These examples will need to be adapted to your terminal’s quoting rules. See Using quotation marks with strings in the AWS CLI User Guide .

To describe your load balancers

This example describes all of your load balancers.

Command:

aws elb describe-load-balancers

To describe one of your load balancers

This example describes the specified load balancer.

Command:

aws elb describe-load-balancers --load-balancer-name my-load-balancer

The following example response is for an HTTPS load balancer in a VPC.

Output:

{
  "LoadBalancerDescriptions": [
    {
      "Subnets": [
          "subnet-15aaab61"
      ],
      "CanonicalHostedZoneNameID": "Z3DZXE0EXAMPLE",
      "CanonicalHostedZoneName": "my-load-balancer-1234567890.us-west-2.elb.amazonaws.com",
      "ListenerDescriptions": [
          {
              "Listener": {
                  "InstancePort": 80,
                  "LoadBalancerPort": 80,
                  "Protocol": "HTTP",
                  "InstanceProtocol": "HTTP"
              },
              "PolicyNames": []
          },
          {
              "Listener": {
                  "InstancePort": 443,
                  "SSLCertificateId": "arn:aws:iam::123456789012:server-certificate/my-server-cert",
                  "LoadBalancerPort": 443,
                  "Protocol": "HTTPS",
                  "InstanceProtocol": "HTTPS"
              },
              "PolicyNames": [
                  "ELBSecurityPolicy-2015-03"
              ]
          }
      ],
      "HealthCheck": {
          "HealthyThreshold": 2,
          "Interval": 30,
          "Target": "HTTP:80/png",
          "Timeout": 3,
          "UnhealthyThreshold": 2
      },
      "VPCId": "vpc-a01106c2",
      "BackendServerDescriptions": [
          {
              "InstancePort": 80,
              "PolicyNames": [
                  "my-ProxyProtocol-policy"
              ]
          }
      ],
      "Instances": [
          {
              "InstanceId": "i-207d9717"
          },
          {
              "InstanceId": "i-afefb49b"
          }
      ],
      "DNSName": "my-load-balancer-1234567890.us-west-2.elb.amazonaws.com",
      "SecurityGroups": [
          "sg-a61988c3"
      ],
      "Policies": {
          "LBCookieStickinessPolicies": [
              {
                  "PolicyName": "my-duration-cookie-policy",
                  "CookieExpirationPeriod": 60
              }
          ],
          "AppCookieStickinessPolicies": [],
          "OtherPolicies": [
              "my-PublicKey-policy",
              "my-authentication-policy",
              "my-SSLNegotiation-policy",
              "my-ProxyProtocol-policy",
              "ELBSecurityPolicy-2015-03"
          ]
      },
      "LoadBalancerName": "my-load-balancer",
      "CreatedTime": "2015-03-19T03:24:02.650Z",
      "AvailabilityZones": [
          "us-west-2a"
      ],
      "Scheme": "internet-facing",
      "SourceSecurityGroup": {
          "OwnerAlias": "123456789012",
          "GroupName": "my-elb-sg"
      }
    }
  ]
}

Output¶

LoadBalancerDescriptions -> (list)

Information about the load balancers.

(structure)

Information about a load balancer.

LoadBalancerName -> (string)

The name of the load balancer.

DNSName -> (string)

The DNS name of the load balancer.

CanonicalHostedZoneName -> (string)

The DNS name of the load balancer.

For more information, see Configure a Custom Domain Name in the Classic Load Balancers Guide .

CanonicalHostedZoneNameID -> (string)

The ID of the Amazon Route 53 hosted zone for the load balancer.

ListenerDescriptions -> (list)

The listeners for the load balancer.

(structure)

The policies enabled for a listener.

Listener -> (structure)

The listener.

Protocol -> (string)

The load balancer transport protocol to use for routing: HTTP, HTTPS, TCP, or SSL.

LoadBalancerPort -> (integer)

The port on which the load balancer is listening. On EC2-VPC, you can specify any port from the range 1-65535. On EC2-Classic, you can specify any port from the following list: 25, 80, 443, 465, 587, 1024-65535.

InstanceProtocol -> (string)

The protocol to use for routing traffic to instances: HTTP, HTTPS, TCP, or SSL.

If the front-end protocol is TCP or SSL, the back-end protocol must be TCP or SSL. If the front-end protocol is HTTP or HTTPS, the back-end protocol must be HTTP or HTTPS.

If there is another listener with the same InstancePort whose InstanceProtocol is secure, (HTTPS or SSL), the listener’s InstanceProtocol must also be secure.

If there is another listener with the same InstancePort whose InstanceProtocol is HTTP or TCP, the listener’s InstanceProtocol must be HTTP or TCP.

InstancePort -> (integer)

The port on which the instance is listening.

SSLCertificateId -> (string)

The Amazon Resource Name (ARN) of the server certificate.

PolicyNames -> (list)

The policies. If there are no policies enabled, the list is empty.

(string)

Policies -> (structure)

The policies defined for the load balancer.

AppCookieStickinessPolicies -> (list)

The stickiness policies created using CreateAppCookieStickinessPolicy .

(structure)

Information about a policy for application-controlled session stickiness.

PolicyName -> (string)

The mnemonic name for the policy being created. The name must be unique within a set of policies for this load balancer.

CookieName -> (string)

The name of the application cookie used for stickiness.

LBCookieStickinessPolicies -> (list)

The stickiness policies created using CreateLBCookieStickinessPolicy .

(structure)

Information about a policy for duration-based session stickiness.

PolicyName -> (string)

The name of the policy. This name must be unique within the set of policies for this load balancer.

CookieExpirationPeriod -> (long)

The time period, in seconds, after which the cookie should be considered stale. If this parameter is not specified, the stickiness session lasts for the duration of the browser session.

OtherPolicies -> (list)

The policies other than the stickiness policies.

(string)

BackendServerDescriptions -> (list)

Information about your EC2 instances.

(structure)

Information about the configuration of an EC2 instance.

InstancePort -> (integer)

The port on which the EC2 instance is listening.

PolicyNames -> (list)

The names of the policies enabled for the EC2 instance.

(string)

AvailabilityZones -> (list)

The Availability Zones for the load balancer.

(string)

Subnets -> (list)

The IDs of the subnets for the load balancer.

(string)

VPCId -> (string)

The ID of the VPC for the load balancer.

Instances -> (list)

The IDs of the instances for the load balancer.

(structure)

The ID of an EC2 instance.

InstanceId -> (string)

The instance ID.

HealthCheck -> (structure)

Information about the health checks conducted on the load balancer.

Target -> (string)

The instance being checked. The protocol is either TCP, HTTP, HTTPS, or SSL. The range of valid ports is one (1) through 65535.

TCP is the default, specified as a TCP: port pair, for example “TCP:5000”. In this case, a health check simply attempts to open a TCP connection to the instance on the specified port. Failure to connect within the configured timeout is considered unhealthy.

SSL is also specified as SSL: port pair, for example, SSL:5000.

For HTTP/HTTPS, you must include a ping path in the string. HTTP is specified as a HTTP:port;/;PathToPing; grouping, for example “HTTP:80/weather/us/wa/seattle”. In this case, a HTTP GET request is issued to the instance on the given port and path. Any answer other than “200 OK” within the timeout period is considered unhealthy.

The total length of the HTTP ping target must be 1024 16-bit Unicode characters or less.

Interval -> (integer)

The approximate interval, in seconds, between health checks of an individual instance.

Timeout -> (integer)

The amount of time, in seconds, during which no response means a failed health check.

This value must be less than the Interval value.

UnhealthyThreshold -> (integer)

The number of consecutive health check failures required before moving the instance to the Unhealthy state.

HealthyThreshold -> (integer)

The number of consecutive health checks successes required before moving the instance to the Healthy state.

SourceSecurityGroup -> (structure)

The security group for the load balancer, which you can use as part of your inbound rules for your registered instances. To only allow traffic from load balancers, add a security group rule that specifies this source security group as the inbound source.

OwnerAlias -> (string)

The owner of the security group.

GroupName -> (string)

The name of the security group.

SecurityGroups -> (list)

The security groups for the load balancer. Valid only for load balancers in a VPC.

(string)

CreatedTime -> (timestamp)

The date and time the load balancer was created.

Scheme -> (string)

The type of load balancer. Valid only for load balancers in a VPC.

If Scheme is internet-facing , the load balancer has a public DNS name that resolves to a public IP address.

If Scheme is internal , the load balancer has a public DNS name that resolves to a private IP address.

NextMarker -> (string)

The marker to use when requesting the next set of results. If there are no additional results, the string is empty.

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