make forceSystemd private

pkg/minikube/cruntime/containerd.go

@@ -429,8 +429,3 @@ func addRepoTagToImageName(imgName string) string {
 	} // else it already has repo name dont add anything
 	return imgName
 }
-
-// TODO: Implement for containerd
-func (r *Containerd) ForceSystemd() error {
-	return nil
-}

pkg/minikube/cruntime/crio.go

@@ -229,8 +229,3 @@ func (r *CRIO) Preload(cfg config.KubernetesConfig) error {
 	}
 	return fmt.Errorf("not yet implemented for %s", r.Name())
 }
-
-// ForceSystemd does nothing for crio since it already uses systemd as cgroup manager
-func (r *CRIO) ForceSystemd() error {
-	return nil
-}

pkg/minikube/cruntime/cruntime.go

@@ -104,8 +104,6 @@ type Manager interface {
 	SystemLogCmd(int) string
 	// Preload preloads the container runtime with k8s images
 	Preload(config.KubernetesConfig) error
-	// ForceSystemd forces the container runtime to use systemd as cgroup manager
-	ForceSystemd() error
 }
 
 // Config is runtime configuration

pkg/minikube/cruntime/docker.go

@@ -111,7 +111,7 @@ func (r *Docker) Enable(disOthers, forceSystemd bool) error {
 	}
 
 	if forceSystemd {
-		if err := r.ForceSystemd(); err != nil {
+		if err := r.forceSystemd(); err != nil {
 			return err
 		}
 	}
@@ -281,7 +281,7 @@ func (r *Docker) SystemLogCmd(len int) string {
 }
 
 // ForceSystemd forces the docker daemon to use systemd as cgroup manager
-func (r *Docker) ForceSystemd() error {
+func (r *Docker) forceSystemd() error {
 	daemonConfig := `{
 "exec-opts": ["native.cgroupdriver=systemd"],
 "log-driver": "json-file",