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Google Cloud has sticky sessions for network load balancing, but how to enable stickiness for HTTP load balancing. Just can not find...
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Session affinity, also known as “sticky sessions”, is the function of the load balancer that directs subsequent requests from each unique session to the same Dgraph in the load balancer pool.
External TCP Proxy Load Balancing supports Session Affinity and offers client IP affinity, which forwards all requests from the same client IP address to the same backend.
Session stickiness, a.k.a., session persistence, is a process in which a load balancer creates an affinity between a client and a specific network server for the duration of a session, (i.e., the time a specific IP spends on a website).
Google's global load balancer knows where the clients are located and directs packets to the closest web service, providing low latency to users while using a single virtual IP (VIP). Using a single VIP means we can increase the time to live (TTL) of our DNS records, which further reduces latency.
Now the feature of sticky session is extended to Google Cloud HTTP(S) Load balancer. We can have session affinity either by Client IP or Client Cookie. For more information please refer this documentation.
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This feature has been released, but is currently in alpha phase.
Client IP affinity
Note: Generated cookie affinity seems like a much better option. Solves two of the issues related to IP affinity, as mentioned in the link.
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Well, unfortunately session affinity is only available for Network load balancing. Just left a feature request at: https://code.google.com/p/google-compute-engine/issues/detail?id=240&thanks=240&ts=1442238732.
Please, vote!
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