Knowledge Base  /  General  /  LBaaS
Knowledge Base  /  General  /  LBaaS

Getting Started with Load Balancer as a Service

Updated by Matthew Farrell on Aug 25, 2016
Article Code: kb/437

Audience

Cloud Network Administrators, Application Developers

Overview

Lumen Load-Balancer-as-a-Service (LBaaS) helps you build highly scalable and highly available applications by providing application-level (HTTP & TCP) load balancing. It also offers various persistence methods to ensure that a user, once connected, continues to be connected to the same application instance.

What is Load-Balancer-as-a-Service?

LBaaS is a load balancing solution that is meant to provide both server load balancing and high availability in an industry standard manner.

LBaaS Feature List

  • Programmable API
    • Create, Read, Update, Delete
  • Highly Available, Resilient Infrastructure
  • Load Balancing Protocols: HTTP (any port), TCP (any port)
  • Load Balancing Algorithms: Round Robin, Least Connections, Source IP Hash
  • Persistence: Source IP
  • Health Checks: SSL, HTTP & TCP
  • Port Forwarding/Redirect

Create a Load Balancer: User Interface

To get started with the User Interface (UI), select the Network Icon
inside of Control Portal:

Next, select Load Balancer from list of Network objects:

Now, let’s get started creating a Load Balancer. Click ‘create load
balancer’

  • (1)Select a location (Data Center) you wish to deploy the load balancer
    to
  • (2) Provide it a Name
  • (3) Provide description (if needed)
  • (4) Select Create Load Balancer

Upon creating your load balancer, the UI will refresh to show you the
status of your load balancer

Once status has changed from ‘creating’ to ‘active’ your Load Balancer
is ready to add pools (Please note, a manual refresh of the page may be
required to see an updated status).

Adding Pool(s) – User Interface

Now that the Load Balancer is created, we need to add pools. After
selecting the Load Balancer from the previous screen, click on either of
the ‘add pool’ buttons.

After selecting ‘add pool’, you will now need to populate the following
fields:

  1. mode/port: For LBaaS enabled data centers, users can select
    either http or TCP for mode and can populate any port (above 23) to
    load balance against. (Please note for all non-LBaaS enabled
    centers, users will only be offered a selection of http for mode and
    will only be able to load balance against port 80 or 443).

  2. Method: Select between round robin, least connection or Source IP

  3. Persistence: Select between None and Source IP

Adding Node(s) – User Interface

At this point it is time to add node(s), do so by selecting the ‘add
node’ button. Enter the IP of the node and the desired port (to add
additional nodes to the pool, simply repeat this step).

Health Checks – User Interface

LBaaS uses health checks to determine if a backend server is available
to process requests. This avoids having to manually remove a server from
the backend if it becomes unavailable. The default health check is to
try to establish a TCP connection to the server (i.e. it checks if the
backend server is listening on the configured IP address and port).

If a server fails a health check, and therefore is unable to serve
requests, it is automatically disabled in the backend i.e. traffic will
not be forwarded to it until it becomes healthy again. If all servers in
a backend fail, the service will become unavailable until at least one
of those backend servers becomes healthy again.

Configure Health Checks via UI

To enable health checks in the UI, simply slide the enable health checks
button from ‘no’ to ‘yes’ (Please note non-LBaaS enabled data centers
will be able to see the health check button, but will be unable to
enable health checks at this time). Simply set the health check
parameters based on the definitions provided below.

Health Check Definitions

Target Port: This is the target protocol and port pair. Either HTTP or
TCP and a selection in the range of valid ports from 1 through 65535.
The format is “http:3381”, for example.

Unhealthy Threshold: The number of consecutive health check failures
before moving the instance to the unhealthy state. Integer values
between 2 and 10 are allowed.

Healthy Threshold: The number of consecutive health check successes
requires before moving the instance to the healthy state. Integer values
between 2 and 10 are allowed.

Health Check Interval Seconds: The interval in seconds between health
checks. Integer values between 5 and 300 are allowed.

After adding health checks, if desired, you will be redirected back to
the list of available pools. At this point, the status will be set to
creating. Within minutes the status will be set to active. And that’s
it!

Updating a Pool via the UI

To update a pool, first, select the load balancer instance the pool is
associated to.

Next, drill in to the appropriate pool:

Once in the pool, make any necessary changes and when finished select
‘save’ to commit the changes. Once the changes are committed, you will
be redirected back to the list of pools, which will show a status of
‘updating’

Once the updates are complete, the status will change to ‘active’.

Delete a Pool via UI

To delete a pool, select the appropriate load balancer the pool is
associated to.

From the list of available pools, select the pool you wish to delete.

Once in the pool, select the delete pool button.

Upon selecting delete, you will be prompted to confirm your decision to
complete. Upon selecting ‘Yes, I am sure’, you will be redirected back
to the list of pools, to which you can see a status of ‘deleting’ on the
pool in question.

Once the pool has successfully been deleted, the page will refresh and
the deleted pool will no longer appear in the list of available pools.

Deleting or Updating a Load Balancer via UI

To Delete or Update a load balancer, select the appropriate Load
Balancer.

Select the ‘settings’ button.

Once inside of the settings, you can update the name and/or description
of the Load Balancer. To commit your changes, select save.

Alternatively, if you wish to delete the load balancer in question,
select the delete button.

API Configuration and Management

Manage your LBaaS from anywhere with an API. Create LBaaS VIPs and pools, add/remove servers from pool, and delete LBaaS configurations through a REST API that supports only JSON for all operations.

This API is RESTful, using JSON messages over HTTP and relying on the standard HTTP verbs including GET, POST, PUT, and DELETE. The general URL format of the service is:
https://api.loadbalancer.ctl.io/{accountAlias}/{datacenter}/loadbalancers

The request format is specified using the ‘Content-Type’ header and is required for operations that have a request body. The response format should be specified in requests using the ‘Accept’ header.

Authenticate Against the API

Authentication to the API is done with the same credentials used to access the Lumen Cloud Control Portal. The username and password are provided to the API and in return, the user gets back a credentials object. This object contains a valid bearer token, which must be provided on each subsequent API request and can be reused for up to 2 weeks. The HTTP request must also include a Content-Type header set to application/json.

Configure the Load Balancer-as-a-Service (LBaaS)

Create LBaaS

To create the LBaaS framework and to get a VIP assigned, use the Create LBaaS function.

Structure:

POST https://api.loadbalancer.ctl.io/{accountAlias}/{datacenter}/loadbalancers
Name Type Description Req.
AccountAlias string Short code for a particular account Yes
DataCenter string Short string representing the data center where the load balancer is. Valid codes can be retrieved from the Get Data Center List API operation. Yes

Example

POST  https://api.loadbalancer.ctl.io/DV01/NY1/loadbalancers

{  
  "name":"ExampleGroup",
  "description":"Example Group for demo purposes"
}  

RESPONSE:  
{  
  "id": "d685c028-5852-4b6f-8511-a407147db0e4",
  "status": "ACTIVE",  
  "description": "Create Load Balancer a4ad7c71-1575-400e-8eb2-cef74ed557ad",  
  "requestDate": 1450383770701,  
  "completionDate": null,  
  "links": [  
    {  
      "rel": "loadbalancer",  
      "href": "",  
      "resourceId": "a4ad7c71-1575-400e-8eb2-cef74ed557ad"  
    }  
  ]  
}  

Entity Definition

Name Type Description
id string ID of the LBaaS load balancer create request
status string Initially the response will show a status for the request of "ACTIVE". A status of "COMPLETE" will show in the Response of a function when the Group has been created with the new configuration.
description string Describes the activity running within the LBaaS Group create process
requestDate string Date-time stamp of the request
completionDate string Date-time stamp of LBaaS Group creation. Null value returned until process has completed
links array Collection of entity links that point to resources related to this LBaaS Group

View Status of LBaaS requestDate

To check on the status of the request, use the same URL used to create the load balancer appended with </requests/{id}>.

Structure:

https://api.loadbalancer.ctl.io/{accountAlias}/{datacenter}/loadbalancers/requests/{id}
Name Type Description Req.
AccountAlias string Short code for a particular account Yes
DataCenter string Short string representing the data center where the load balancer is. Valid codes can be retrieved from the Get Data Center List API operation. Yes
id string The id of the request the user is interested in. This id was provided in the response to the Create LBaaS Group API call. Yes

Example

GET https://api.loadbalancer.ctl.io/DV01/NY1/loadbalancers/requests/d685c028-5852-4b6f-8511-a407147db0e4  

{  
  "id": "d685c028-5852-4b6f-8511-a407147db0e4",  
  "status": "COMPLETE",  
  "description": "Create Load Balancer a4ad7c71-1575-400e-8eb2-cef74ed557ad",  
  "requestDate": 1450383770701,  
  "completionDate": null,  
  "links": [  
    {  
      "rel": "loadbalancer",  
      "href": "",  
      "resourceId": "a4ad7c71-1575-400e-8eb2-cef74ed557ad"  
    }  
  ]  
}

Entity Definition

Name Type Description
id string ID of the LBaaS group create request
status string Initially the response will show a status for the request of "ACTIVE". A status of "COMPLETE" will show in the Response of a GET LBaaS group function when the Group has been created with the new configuration.
description string Describes the activity running within the LBaaS Group create process
requestDate string Date-time stamp of the request
completionDate string Date-time stamp of LBaaS Group creation. Null value returned until process has completed
links array Collection of entity links that point to resources related to this LBaaS Group

View Details of LBaaS (within a given datacenter)

To see the status and details of a single LBaaS, use the GET function with the same basic URL as the Create LBaaS appended with the Load Balancer ID.

Structure:

GET https://api.loadbalancer.ctl.io/{accountAlias}/{DataCenter}/loadbalancers/{loadBalancerId}
Name Type Description Req.
accountAlias string Short code for a particular account Yes
DataCenter string Short string representing the data center where the load balancer is. Valid codes can be retrieved from the Get Data Center List API operation. Yes
loadBalancerId string The id of the Load Balancer for which details are to be returned Yes

Example

GET https://api.loadbalancer.ctl.io/DV01/NY1/loadbalancers/a4ad7c71-1575-400e-8eb2-cef74ed557ad

RESPONSE:
{
  "id": "a4ad7c71-1575-400e-8eb2-cef74ed557ad",  
  "name": "TomGroup2",  
  "description": "TomDemo2",  
  "publicIPAddress": "10.72.76.199",  
  "privateIPAddress": "10.72.76.199",  
  "pools": [],  
  "status": "READY",  
  "accountAlias": "DV01",  
  "dataCenter": "NY1",  
  "keepalivedRouterId": "199",  
  "version": "7d6f11193ef05e6e"  
}

Entity Definitions

Name Type Description
id string ID of the LBaaS Load Balancer
name string Customer given name of LBaaS Load Balancer
description string Customer given description of LBaaS Load Balancer
publicIPAddress string IP address of the LBaaS Load Balancer public interface (Internet facing network)
pools array Collection of entity values that describe load balanced pools configured on the Load Balancer
(pools) id string ID of the LBaaS Load Balancer pool
(pools) port string Port the LBaaS Load Balancer pool will be listening on
(pools) loadBalancingMethod string Load balancing method configured for the pool - "roundrobin" or "leastconn."
(pools) persistence string Load balancing persistence type configured for the pool
(pools) idleTimeout integer Number of milliseconds to allow before disconnecting an idle session
(pools) loadBalancingMode string Load balancing mode indicates the network layer being load balanced - "tcp" or "http". Layer 4 - TCP, Layer 7 - HTTP(S)
(pools) nodes array Collection of entity values that describe the customer backend nodes being load balanced
(pools / nodes) ipAddress string IP address of the backend node being load balanced
(pools / nodes) privatePort string Port on the backend node where load balanced transactions are to be sent
(pools) healthCheck string Health check configuration for the backend node pool members
status string Status of the LBaaS Load Balancer - "READY", "DELETED", "UNDER_CONSTRUCTION", "UPDATING_CONFIGURATION", "FAILED"
accountAlias string Short code for a particular account
dataCenter string Short string representing the data center where the load balancer is. Valid codes can be retrieved from the Get Data Center List API operation.

View Details for All LBaaS (within a given account alias)

To see the status and details of all LBaaS instances for a given account, use the GET function with the same API call as used in the Create LBaaS Group.

Structure:

GET https://api.loadbalancer.ctl.io/{accountAlias}/loadbalancers
Name Type Description Req.
AccountAlias string Short code for a particular account Yes

Example

GET https://api.loadbalancer.ctl.io/DV01/loadbalancers

RESPONSE:
{
  "values": [  
  {
    "id": "a4ad7c71-1575-400e-8eb2-cef74ed557ad",
    "name": "TomGroup2",
    "description": "TomDemo2",
    "publicIPAddress": "10.72.76.199",
    "privateIPAddress": "10.72.76.199",
    "pools": [],
    "status": "READY",
    "accountAlias": "DV01",
    "dataCenter": "NY1",
    "keepalivedRouterId": "199",
    "version": "7d6f11193ef05e6e"
  },
  {
    "id": "8f65e075-7f72-4b4a-ace8-af69552b10a2",
    "name": "LBAAS_API_LB",
    "description": "Load balancer for LBAAS API servers",
    "publicIPAddress": "10.72.76.224",
    "privateIPAddress": "10.72.76.224",
    "pools": [  
      {
        "id": "42a65738-780f-4539-a02e-29ae0b8c5f44",
        "port": 443,
        "loadBalancingMethod": "roundrobin",
        "persistence": "none",
        "idleTimeout": 50000,
        "loadBalancingMode": "tcp",
        "nodes": [
          {
            "ipAddress": "10.71.250.13",
            "privatePort": 8443
          }
        ],
        "healthCheck": null
      }
    ],
    "status": "READY",
    "accountAlias": "DV01",
    "dataCenter": "NY1",
    "keepalivedRouterId": "224",
    "version": "c0ed2dc00c2aa735"
   }
  ]  
}

Entity Definition

Name Type Description
id string ID of the LBaaS Load Balancer
name string Customer given name of LBaaS Load Balancer
description string Customer given description of LBaaS Load Balancer
publicIPAddress string IP address of the LBaaS Load Balancer public interface (Internet facing network)
pools array Collection of entity values that describe load balanced pools configured on the Load Balancer
(pools) id string ID of the LBaaS Load Balancer pool
(pools) port string Port the LBaaS Load Balancer pool will be listening on
(pools) loadBalancingMethod string Load balancing method configured for the pool - "roundrobin" or "leastconn."
(pools) persistence string Load balancing persistence type configured for the pool
(pools) idleTimeout integer Number of milliseconds to allow before disconnecting an idle session
(pools) loadBalancingMode string Load balancing mode indicates the network layer being load balanced - "tcp" or "http". Layer 4 - TCP, Layer 7 - HTTP(S)
(pools) nodes array Collection of entity values that describe the customer backend nodes being load balanced
(pools / nodes) ipAddress string IP address of the backend node being load balanced
(pools / nodes) privatePort string Port on the backend node where load balanced transactions are to be sent
(pools) healthCheck string Health check configuration for the backend node pool members
status string Status of the LBaaS Load Balancer - "READY", "DELETED", "UNDER_CONSTRUCTION", "UPDATING_CONFIGURATION", "FAILED"
accountAlias string Short code for a particular account
dataCenter string Short string representing the data center where the load balancer is. Valid codes can be retrieved from the Get Data Center List API operation.

Create pool

Append the URL with the Group ID that was provided in the Create Group POST response followed by .

Structure:

POST https://api.loadbalancer.clt.io/{accountAlias}/{dataCenter}/loadbalancers/{loadBalancerId}/pools/
Name Type Description Req.
AccountAlias string Short code for a particular account Yes
DataCenter string Short string representing the data center where the load balancer is. Valid codes can be retrieved from the Get Data Center List API operation. Yes
loadBalancerId string The id of the Load Balancer for which details are to be returned Yes

Example:

POST https://api.loadbalancer.ctl.io/test1/NY1/loadbalancers/d8490ee7-fd57-4df3-b932-f32f0a785da8/pools  

{
  "port":"443",
  "loadBalancingMethod":"roundrobin",
  "loadBalancingMode":"http",
  "healthCheck":{"unhealthyThreshold": 2, "healthyThreshold": 2, "intervalSeconds": 5, "targetPort": 80},
  "persistence":"source_ip",
  "idleTimeout": 3600,
  "nodes":[
  {
   "ipAddress":"204.79.197.200",
   "privatePort":"8080"
  },
  {
   "ipAddress":"216.146.46.11",
   "privatePort":"8080"
  }
 ]
}

Entity Definitions:

Name Type Description Req.
port string The port on which incoming traffic will send requests Yes
loadBalancingMethod string Method for load balancing – “roundrobin” or “leastconn” No
loadBalancingMode string Indicates the type of Load Balancing – TCP or HTTP(S) (layer4-TCP or Layer7-HTTP(s)) Yes
healthCheck string Configures a TCP health check for the pool with the variable settings noted below in the Health Checks section of this document No
persistence array Persistence method for client connections to backend nodes – “none” or “source_ip” No
idleTimeout integer Timeout value for idle client connections to backend nodes No
nodes string Collection of entity values that describe the customer backend nodes being load balanced No
(nodes) ipAddress string IP of the server that will be load balanced No
(nodes) privatePort integer Port on which the server that will be load balanced is listening No
RESPONSE:
{
  "id": "7290dd68-be87-404b-8fc6-e4fa2e8aded6",
  "status": "ACTIVE",
  "description": "Update Pool to Load Balancer a712200e-9504-43db-994f-f5b2e485b078",
  "requestDate": 1444330761475,
  "completionDate": null,
  "links": [
    {
      "rel": "loadbalancer",
      "href": "",
      "resourceId": "a712200e-9504-43db-994f-f5b2e485b078"
    },
    {
      "rel": "pool",
      "href": "",
      "resourceId": "6db7c15c-e954-4b7a-9d24-523b10db2db6"
    }
  ]
}

Update Pool

Append the URL with the Group ID that was provided in the Create Group POST response followed by . Further append the URL with the Pools ID that was provided in the Create Pools POST response.

Structure:

PUT https://api.loadbalancer.clt.io/{accountAlias}/{dataCenter}/loadbalancers/{loadBalancerId}/pools/{poolId}
Name Type Description Req.
accountAlias string Short code for a particular account Yes
dataCenter string Short string representing the data center where the load balancer is. Valid codes can be retrieved from the Get Data Center List API operation. Yes
loadBalancerId string The id of the Load Balancer for which details are to be returned Yes
poolId string The id of the Load Balancer for which configuration is to be updated Yes

Example:

PUT  https://api.loadbalancer.ctl.io/test1/NY1/loadbalancers/d8490ee7-fd57-4df3-b932-f32f0a785da8/pools/786b6438-48fd-45df-9e9c-68b98610fe06

{
  "port":"443",
  "loadBalancingMethod":"leastconn",
  "loadBalancingMode":"tcp",
  "healthCheck":{"unhealthyThreshold": 2, "healthyThreshold": 2, "intervalSeconds": 5, "targetPort": 80},
  "persistence":"none",
  "idleTimeout": 3600,
  "nodes":[
    {
      "ipAddress":"204.79.197.200",
      "privatePort":"8080"
    },
    {
      "ipAddress":"173.194.46.49",
      "privatePort":"8080"
    }
   ]
  }

Entity Definition

Name Type Description Req.
port string The port on which incoming traffic will send requests Yes
loadBalancingMethod string Method for load balancing – “roundrobin” or “leastconn” No
loadBalancingMode string Indicates the type of Load Balancing – TCP or HTTP(S) (layer4-TCP or Layer7-HTTP(s))
healthCheck string Configures a TCP health check for the pool with the variable settings noted below in the Health Checks section of this document
persistence array Persistence method for client connections to backend nodes – “none” or “source_ip”
idleTimeout integer Timeout value for idle client connections to backend nodes
nodes string Collection of entity values that describe the customer backend nodes being load balanced
(nodes) ipAddress string IP of the server that will be load balanced
(nodes) privatePort integer Port on which the server that will be load balanced is listening
RESPONSE:
{
  "id": "351a23be-2ace-454e-8910-f31a357ceb0f",
  "status": "ACTIVE",
  "description": "Update Pool to Load Balancer a712200e-9504-43db-994f-f5b2e485b078",
  "requestDate": 1444331344021,
  "completionDate": null,
  "links": [
      {
          "rel": "loadbalancer",
          "href": "",
          "resourceId": "a712200e-9504-43db-994f-f5b2e485b078"
      },
      {
          "rel": "pool",
          "href": "",
          "resourceId": "6db7c15c-e954-4b7a-9d24-523b10db2db6"
      }
  ]
}

Delete Pool

Simply use the URL with the Group ID followed by . Further append the URL with the Pools ID that was provided in the Create Pools POST response. No request body is required.

Structure:

DELETE https://api.loadbalancer.clt.io/{accountAlias}/{dataCenter}/loadbalancers/{loadBalancerId}/pools/{poolId}

Example

DELETE  https://api.loadbalancer.ctl.io/test1/NY1/loadbalancers/d8490ee7-fd57-4df3-b932-f32f0a785da8/pools/786b6438-48fd-45df-9e9c-68b98610fe06

RESPONSE:
{
  "id": "5257d0f9-eb60-4bf8-9b47-6bd510358cd9",
  "status": "ACTIVE",
  "description": "Delete Load Balancer a712200e-9504-43db-994f-f5b2e485b078",
  "requestDate": 1444331474296,
  "completionDate": null,
  "links": [
      {
          "rel": "loadbalancer",
          "href": "",
          "resourceId": "a712200e-9504-43db-994f-f5b2e485b078"
      }
  ]
}
Name Type Description
id string ID of the LBaaS load balancer pool delete request
status string Initially the response will show a status for the request of "ACTIVE". A status of "COMPLETE" will show in the Response of a GET LBaaS group function when the pool has been deleted.
description string Describes the activity running within the LBaaS load balancer pool delete process
requestDate string Date-time stamp of the request
completionDate string Date-time stamp of request completion. Null value returned until process has completed
links array Collection of entity links that point to resources related to this LBaaS load balancer pool
rel array Describes the entity - "loadbalancer" or "pool"
resourceId string ID of the load balancer or pool entity

Delete LBaaS

Deletes a LBaaS Load Balancer configuration including any pools configured on the Load Balancer.

Simply use the URL with the Group ID. No request body is required.

Structure:

DELETE https://api.loadbalancer.clt.io/{accountAlias}/{dataCenter}/loadbalancers/{loadBalancerId}
Name Type Description Req.
AccountAlias string Short code for a particular account Yes
DataCenter string Short string representing the data center where the load balancer is. Valid codes can be retrieved from the Get Data Center List API operation. Yes
loadBalancerId string The id of the Load Balancer to be deleted Yes

Example

DELETE  https://api.loadbalancer.ctl.io/DV01/NY1/loadbalancers/47bb8d61-2a3f-4de8-9f93-5c6a4805e7da

RESPONSE:
{
  "id": "24d70fdc-965b-48fe-8aa2-9571db3d46a0",  
  "status": "ACTIVE",
  "description": "Delete Load Balancer 47bb8d61-2a3f-4de8-9f93-5c6a4805e7da",
  "requestDate": 1450795381033,
  "completionDate": null,
  "links": [
    {
      "rel": "loadbalancer",
      "href": "",
      "resourceId": "47bb8d61-2a3f-4de8-9f93-5c6a4805e7da"
    }
  ]
}
Name Type Description
id string ID of the LBaaS load balancer delete request
status string Initially the response will show a status for the request of "ACTIVE". A status of "COMPLETE" will show in the Response of a GET LBaaS group function when the pool has been deleted.
description string Describes the activity running within the LBaaS load balancer delete process
requestDate string Date-time stamp of the request
completionDate string Date-time stamp of request completion. Null value returned until process has completed
links array Collection of entity links that point to resources related to this LBaaS load balancer pool
rel array Describes the entity - "loadbalancer" or "pool"
resourceId string ID of the load balancer or pool entity
If you delete a LBaaS Load Balancer that has an existing pool, the pool will be deleted at the same time.

Health Checks

LBaaS uses health checks to determine if a backend server is available to process requests. This avoids having to manually remove a server from the backend if it becomes unavailable. The default health check is to try to establish a TCP connection to the server (i.e. it checks if the backend server is listening on the configured IP address and port).

If a server fails a health check, and therefore is unable to serve requests, it is automatically disabled in the backend i.e. traffic will not be forwarded to it until it becomes healthy again. If all servers in a backend fail, the service will become unavailable until at least one of those backend servers becomes healthy again.

Users can also apply custom health checks at both the pool and node level. Applying a health check at the pool level applies to all of the nodes in the pool. A custom health check applied at the node level will on be relevant on the designated node and will supersede any health check applied at the pool level.

Health Check Configurations

Unhealthy Threshold: The number of consecutive health check failures before moving the instance to the unhealthy state. Integer values between 2 and 10 are allowed.

Healthy Threshold: The number of consecutive health check successes requires before moving the instance to the healthy state. Integer values between 2 and 10 are allowed.

Interval Seconds: The interval in seconds between health checks. Integer values between 5 and 300 are allowed.

Target Port: This is the target protocol and port pair. Either HTTP or TCP and a selection in the range of valid ports from 1 through 65535. The format is “http:3381”, for example.