Reference documentation and code samples for the Compute Engine v1 API enum BackendServiceConnectionTrackingPolicy.Types.ConnectionPersistenceOnUnhealthyBackends.
Specifies connection persistence when backends are unhealthy. The default value is DEFAULT_FOR_PROTOCOL. If set to DEFAULT_FOR_PROTOCOL, the existing connections persist on unhealthy backends only for connection-oriented protocols (TCP and SCTP) and only if the Tracking Mode is PER_CONNECTION (default tracking mode) or the Session Affinity is configured for 5-tuple. They do not persist for UDP. If set to NEVER_PERSIST, after a backend becomes unhealthy, the existing connections on the unhealthy backend are never persisted on the unhealthy backend. They are always diverted to newly selected healthy backends (unless all backends are unhealthy). If set to ALWAYS_PERSIST, existing connections always persist on unhealthy backends regardless of protocol and session affinity. It is generally not recommended to use this mode overriding the default. For more details, see Connection Persistence for Network Load Balancing and Connection Persistence for Internal TCP/UDP Load Balancing.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-03-21 UTC."],[[["This document provides reference information for the `ConnectionPersistenceOnUnhealthyBackends` enum within the Google Cloud Compute Engine v1 API, detailing how connections are managed when backends become unhealthy."],["The enum `ConnectionPersistenceOnUnhealthyBackends` has three defined fields: `AlwaysPersist`, `DefaultForProtocol`, and `NeverPersist`, each controlling connection behavior in scenarios where backends are unhealthy."],["The latest documented version of this specific component of Google Cloud Compute Engine V1 API is 3.6.0, with access to versions ranging from 1.0.0 to the latest."],["`DefaultForProtocol` is the default behavior, allowing existing connections to persist on unhealthy backends only for connection-oriented protocols like TCP and SCTP, and when the Tracking Mode is PER_CONNECTION or Session Affinity is configured for 5-tuple."],["The `AlwaysPersist` option will keep existing connections on unhealthy backends regardless of protocol or affinity, and `NeverPersist` will always divert connections away from unhealthy backends, unless all backends are unhealthy."]]],[]]
