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Bug 1929314: detect if the cluster has endpoint slices #436

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Bug 1929314: detect if the cluster has endpoint slices #436

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18 changes: 3 additions & 15 deletions go-controller/pkg/util/kube.go
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,6 @@ package util
import (
"encoding/json"
"fmt"
"strconv"
"strings"

kapi "k8s.io/api/core/v1"
Expand Down Expand Up @@ -240,22 +239,11 @@ func EventRecorder(kubeClient kubernetes.Interface) record.EventRecorder {
return recorder
}

// UseEndpointSlices if the EndpointSlice API is available
// and if the kubernetes versions supports DualStack (Kubernetes >= 1.20)
// UseEndpointSlices detect if Endpoints Slices are enabled in the cluster
func UseEndpointSlices(kubeClient kubernetes.Interface) bool {
endpointSlicesEnabled := false
if _, err := kubeClient.Discovery().ServerResourcesForGroupVersion(discovery.SchemeGroupVersion.String()); err == nil {
// The EndpointSlice API is enabled check if is running in a supported version
klog.V(2).Infof("Kubernetes Endpoint Slices enabled on the cluster: %s", discovery.SchemeGroupVersion.String())
endpointSlicesEnabled = true
return true
}
// We only use Slices if > 1.19 since we only need them for Dual Stack
sv, _ := kubeClient.Discovery().ServerVersion()
major, _ := strconv.Atoi(sv.Major)
minor, _ := strconv.Atoi(sv.Minor)
klog.Infof("Kubernetes running with version %d.%d", major, minor)
if major <= 1 && minor < 20 || !endpointSlicesEnabled {
return false
}
return true
return false
}