HAProxy cookie persistence allows HAProxy to maintain a consistent client-to-server relationship. At Bobcares, with our Server Management Service, we can handle your HAProxy issues.

What Is HAProxy Cookie Persistence?

A feature that enables HAProxy to keep a steady client-to-server connection based on a cookie value is called HAProxy cookie persistence. Other name include session stickiness or session affinity. By enabling cookie persistence, HAProxy can ensure that a client’s subsequent requests reach the same backend server that did the original request processing. Thus resulting in a consistent user experience.

Working

1. HAProxy looks through the request headers when a client sends a request to the load balancer to see if it includes a certain cookie. A distinct identity found in this cookie links the client to a certain backend server.

2. HAProxy retrieves the cookie value from the request, if any, and uses it to identify the backend server connected to the client’s session. After that, HAProxy routes the request to the designated backend server.

3. In HAProxy, we must set up a “sticky session” based on the requested cookie in order to allow cookie persistence.

4. The backend servers, represented by servers 1 and 2 in the example, should be set up to accept and process incoming requests while taking the cookie’s session affinity into account.

The backend servers must be set up to respect the session affinity that HAProxy provides. Based on the received cookie value, they ought to be able to recognize and associate the client’s session. HAProxy also makes sure that requests from a client with a particular cookie reach the same backend server that processed the initial request by using cookie persistence. This will be an advantage.

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Conclusion

Depending on the needs and HAProxy version, the exact setup and parameters for the HAProxy Cookie Persistence might change.