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Update content/en/docs/concepts/services-networking/service.md 

Co-authored-by: Qiming Teng <tengqm@outlook.com>
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Xudong Liu 2021-03-28 21:35:20 -07:00 committed by GitHub
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@ -632,7 +632,10 @@ You must enable the `ServiceLBNodePortControl` feature gate to use this field.
{{< feature-state for_k8s_version="v1.21" state="alpha" >}}
Starting in v1.21, you can optionally specify class of load balancer implementation for a Service Type=LoadBalancer by setting field `spec.loadBalancerClass` value. By default, `spec.loadBalancerClass` is `nil` and type LoadBalacner Services will use the cloud providers' default load balancer implementation.
Starting in v1.21, you can optionally specify the class of a load balancer implementation for
`LoadBalancer` type of Service by setting the field `spec.loadBalancerClass`.
By default, `spec.loadBalancerClass` is `nil` and a `LoadBalancer` type of Service uses
the cloud provider's default load balancer implementation.
If `spec.loadBalancerClass` is specified, it is assumed that a matching class load balancer implementation is watching for Services and any default load balancer implementation (e.g. cloud providers) will ignore Services that set this field. `spec.loadBalancerClass` can only be set when creating or updating a Service to type 'LoadBalancer'. Once set, it can not be changed.
The value of `spec.loadBalancerClass` must be a label-style identifier, with an optional prefix, e.g. "internal-vip" or "example.com/internal-vip". Unprefixed names are reserved for end-users.
You must enable the `ServiceLoadBalancerClass` feature gate to use this field.