Tracking connections on the OVHcloud Load Balancer

Objective

The OVHcloud Load Balancer service offers several methods for tracking connections (also known as session persistence or stickiness) to your services.

Each session on the OVHcloud Load Balancer service is maintained by a persistent connection system. This system is configured at the application layer of the OVHcloud Load Balancer service to ensure persistent connections to the server.

This guide provides different methods to configure connection tracking for the OVHcloud Load Balancer.

Requirements

• An OVHcloud Load Balancer
• Access to the OVHcloud Control Panel, or
• Access to the OVHcloud API

Instructions

The different types of connection tracking

There are two primary connection tracking methods that can be configured for your services:

The following elements will affect traffic redirection:

• if the configured server weight changes
• if a server in the farm is re-enabled
• if a server in the farm is no longer responding

Modify a server farm’s connection tracking method via the OVHcloud Control Panel

To modify connection tracking for a server farm, navigate to the Server clusters tab, then click the options button ... to the right of the desired farm and select Edit:

In the Advanced settings section, you will be able to access the Track session section:

Once you have configured the farm, click Add or Edit, depending on whether you are configuring a new or modifying an existing farm.

Please remember to deploy the configuration afterward. There are two ways to do so:

• via the Status section of the Control Panel, by clicking on your Load Balancer’s ... button, then selecting Apply configuration

• via the reminder box in the Control Panel, notifying you that the configuration has not been applied, by clicking Apply configuration

Modify a server farm’s connection tracking method via the API

View details on a server farm

This API call allows you to view details for a server farm if you know its ID. For this example, we will work on an HTTP farm.

Modify a server farm’s connection tracking method

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

Apply the modifications

This API call is required to deploy the configuration changes to the Load Balancer service.

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