Class Backend (1.23.0)

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Backend(mapping=None, *, ignore_unknown_fields=False, **kwargs)

Message containing information of one individual backend.

.. _oneof: https://proto-plus-python.readthedocs.io/en/stable/fields.html#oneofs-mutually-exclusive-fields

Attributes
Name	Description
balancing_mode	str Specifies how to determine whether the backend of a load balancer can handle additional traffic or is fully loaded. For usage guidelines, see Connection balancing mode. Backends must use compatible balancing modes. For more information, see Supported balancing modes and target capacity settings and Restrictions and guidance for instance groups. Note: Currently, if you use the API to configure incompatible balancing modes, the configuration might be accepted even though it has no impact and is ignored. Specifically, Backend.maxUtilization is ignored when Backend.balancingMode is RATE. In the future, this incompatible combination will be rejected. Check the BalancingMode enum for the list of possible values. This field is a member of oneof_ _balancing_mode.
capacity_scaler	float A multiplier applied to the backend's target capacity of its balancing mode. The default value is 1, which means the group serves up to 100% of its configured capacity (depending on balancingMode). A setting of 0 means the group is completely drained, offering 0% of its available capacity. The valid ranges are 0.0 and [0.1,1.0]. You cannot configure a setting larger than 0 and smaller than 0.1. You cannot configure a setting of 0 when there is only one backend attached to the backend service. Not available with backends that don't support using a balancingMode. This includes backends such as global internet NEGs, regional serverless NEGs, and PSC NEGs. This field is a member of oneof_ _capacity_scaler.
description	str An optional description of this resource. Provide this property when you create the resource. This field is a member of oneof_ _description.
failover	bool This field designates whether this is a failover backend. More than one failover backend can be configured for a given BackendService. This field is a member of oneof_ _failover.
group	str The fully-qualified URL of an instance group or network endpoint group (NEG) resource. To determine what types of backends a load balancer supports, see the `Backend services overview
max_connections	int Defines a target maximum number of simultaneous connections. For usage guidelines, see Connection balancing mode and Utilization balancing mode. Not available if the backend's balancingMode is RATE. This field is a member of oneof_ _max_connections.
max_connections_per_endpoint	int Defines a target maximum number of simultaneous connections. For usage guidelines, see Connection balancing mode and Utilization balancing mode. Not available if the backend's balancingMode is RATE. This field is a member of oneof_ _max_connections_per_endpoint.
max_connections_per_instance	int Defines a target maximum number of simultaneous connections. For usage guidelines, see Connection balancing mode and Utilization balancing mode. Not available if the backend's balancingMode is RATE. This field is a member of oneof_ _max_connections_per_instance.
max_rate	int Defines a maximum number of HTTP requests per second (RPS). For usage guidelines, see Rate balancing mode and Utilization balancing mode. Not available if the backend's balancingMode is CONNECTION. This field is a member of oneof_ _max_rate.
max_rate_per_endpoint	float Defines a maximum target for requests per second (RPS). For usage guidelines, see Rate balancing mode and Utilization balancing mode. Not available if the backend's balancingMode is CONNECTION. This field is a member of oneof_ _max_rate_per_endpoint.
max_rate_per_instance	float Defines a maximum target for requests per second (RPS). For usage guidelines, see Rate balancing mode and Utilization balancing mode. Not available if the backend's balancingMode is CONNECTION. This field is a member of oneof_ _max_rate_per_instance.
max_utilization	float Optional parameter to define a target capacity for the UTILIZATION balancing mode. The valid range is [0.0, 1.0]. For usage guidelines, see Utilization balancing mode. This field is a member of oneof_ _max_utilization.
preference	str This field indicates whether this backend should be fully utilized before sending traffic to backends with default preference. The possible values are: - PREFERRED: Backends with this preference level will be filled up to their capacity limits first, based on RTT. - DEFAULT: If preferred backends don't have enough capacity, backends in this layer would be used and traffic would be assigned based on the load balancing algorithm you use. This is the default Check the Preference enum for the list of possible values. This field is a member of oneof_ _preference.

Classes

BalancingMode

BalancingMode(value)

Specifies how to determine whether the backend of a load balancer can handle additional traffic or is fully loaded. For usage guidelines, see Connection balancing mode. Backends must use compatible balancing modes. For more information, see Supported balancing modes and target capacity settings and Restrictions and guidance for instance groups. Note: Currently, if you use the API to configure incompatible balancing modes, the configuration might be accepted even though it has no impact and is ignored. Specifically, Backend.maxUtilization is ignored when Backend.balancingMode is RATE. In the future, this incompatible combination will be rejected.

Preference

Preference(value)

This field indicates whether this backend should be fully utilized before sending traffic to backends with default preference. The possible values are: - PREFERRED: Backends with this preference level will be filled up to their capacity limits first, based on RTT. - DEFAULT: If preferred backends don't have enough capacity, backends in this layer would be used and traffic would be assigned based on the load balancing algorithm you use. This is the default