haPolicy property

Configures self-managed High Availability (HA) for External and Internal Protocol Forwarding.

The backends of this regional backend service must only specify zonal network endpoint groups (NEGs) of type GCE_VM_IP. When haPolicy is set for an Internal Passthrough Network Load Balancer, the regional backend service must set the network field. All zonal NEGs must belong to the same network. However, individual NEGs can belong to different subnetworks of that network. When haPolicy is specified, the set of attached network endpoints across all backends comprise an High Availability domain from which one endpoint is selected as the active endpoint (the leader) that receives all traffic. haPolicy can be added only at backend service creation time. Once set up, it cannot be deleted. Note that haPolicy is not for load balancing, and therefore cannot be specified with sessionAffinity, connectionTrackingPolicy, and failoverPolicy. haPolicy requires customers to be responsible for tracking backend endpoint health and electing a leader among the healthy endpoints. Therefore, haPolicy cannot be specified with healthChecks. haPolicy can only be specified for External Passthrough Network Load Balancers and Internal Passthrough Network Load Balancers.