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Tracking Connections

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Stephanie R.
  • Updated

Learn about several ways you can configure tracking connections to your services on the OVHcloud Load Balancer.

Each session on the OVHcloud Load Balancer service is maintained by a persistent connection system. The system is configured on the application layer of the OVHcloud Load Balancer service, and it maintains a persistent connection to the server. This guide is merely an introduction to how you can configure these options.

 

Requirements

 

Instructions

The different types of connection tracking

There are two main connection tracking methods that can be configured on your services:

Tracking connections Details
Cookie Configures a session cookie, which will be used to distribute traffic from a single HTTP session to the same server in the cluster.
SourceIp A hash algorithm will be applied to the source IP address of the request received by the OVHcloud Load Balancer.

The following elements will affect traffic redirection:

  • if the configured weight changes
  • if a server in the cluster is re-enabled
  • if a server in the cluster is no longer responding
NOTE: Once you have refreshed your configuration, the connections will be rebalanced, and your HTTP sessions will be lost as a result.

 

Modify a server cluster's connection tracking method

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From the OVHcloud Control Panel:

  1. Select Bare Metal Cloud from the top navigation bar.
  2. Expand the Network section in the left-hand menu.
  3. Click Load Balancer and choose your Load Balancer service.
  4. Select the Server cluster tab.
  5. Click the more options ... button to the right of the server cluster you wish to modify and choose Edit from the menu.

network_LB_setup_connections01***.png

 

On the next screen, you can modify session tracking in the Advanced settings area. Once you have finished your configuration, click Update.

network_LB_setup_connections02*.png

 

Finalize your changes by clicking Apply configuration in the yellow banner.

network_LB_setup_connections03*.png

 

On the next screen, select ☑ your Datacenter and click Apply configuration.

network_LB_apply01*.PNG

View details on a server cluster

With this call instruction, you can view details on a server cluster if you know its ID. In this example, we will work on an HTTP cluster.

GET /ipLoadbalancing/{serviceName}/http/farm/{farmId}

Setting Meaning
serviceName* Your Load Balancer service ID
farmId* The server cluster's ID number

 

Response (BackendHttp) Meaning
farmId The server luster's ID number
balance Balance type currently enabled for the cluster
zone Name of the zone in which the cluster is configured
port Port used to contact the servers configured on the cluster
probe Type of probe currently configured on the cluster
displayName Name given to this cluster
stickiness Connection tracking method currently set for the cluster

 

Modify a server cluster's connection tracking method

With this call instruction, you can edit the settings of a server cluster if you know its ID. In this example, we will work on an HTTP cluster. To modify the tracking method, the BackendHttp.stickiness field must be updated with an available connection tracking method:

PUT /ipLoadbalancing/{serviceName}/http/farm/{farmId}

Setting Meaning
serviceName* Your Load Balancer service ID
farmId* The server cluster's ID number
BackendHttp.stickiness Connection tracking method chosen for the cluster

 

Apply the modifications

POST /ipLoadbalancing/{serviceName}/refresh

Setting Meaning
serviceName* Your Load Balancer service ID
zone Name of the zone in which to deploy the configuration, e.g. "all" or "rbx"

 

Go further

For more information and tutorials, please see our other OVHcloud Load Balancer guides or explore the guides for other OVHcloud products and services.

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