remove kubelet unused run container options

Author: HirazawaUi

pkg/kubelet/container/runtime.go

@@ -516,8 +516,6 @@ type RunContainerOptions struct {
 	PodContainerDir string
 	// The type of container rootfs
 	ReadOnly bool
-	// hostname for pod containers
-	Hostname string
 }
 
 // VolumeInfo contains information about the volume.

pkg/kubelet/kubelet_pods.go

@@ -61,7 +61,6 @@ import (
 	"k8s.io/kubernetes/pkg/kubelet/metrics"
 	"k8s.io/kubernetes/pkg/kubelet/status"
 	kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
-	"k8s.io/kubernetes/pkg/kubelet/util"
 	utilfs "k8s.io/kubernetes/pkg/util/filesystem"
 	utilkernel "k8s.io/kubernetes/pkg/util/kernel"
 	utilpod "k8s.io/kubernetes/pkg/util/pod"
@@ -587,13 +586,7 @@ func (kl *Kubelet) GenerateRunContainerOptions(ctx context.Context, pod *v1.Pod,
 	if err != nil {
 		return nil, nil, err
 	}
-	// nodename will be equal to hostname if SetHostnameAsFQDN is nil or false. If SetHostnameFQDN
-	// is true and hostDomainName is defined, nodename will be the FQDN (hostname.hostDomainName)
-	nodename, err := util.GetNodenameForKernel(hostname, hostDomainName, pod.Spec.SetHostnameAsFQDN)
-	if err != nil {
-		return nil, nil, err
-	}
-	opts.Hostname = nodename
+
 	podName := volumeutil.GetUniquePodName(pod)
 	volumes := kl.volumeManager.GetMountedVolumesForPod(podName)