gpu: add updateStrategy to daemonSet

Signed-off-by: Hyeongju Johannes Lee <hyeongju.lee@intel.com>

deployments/gpu_plugin/base/intel-gpu-plugin.yaml

@@ -8,6 +8,11 @@ spec:
   selector:
     matchLabels:
       app: intel-gpu-plugin
+  updateStrategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxSurge: 0
+      maxUnavailable: 1
   template:
     metadata:
       labels:

pkg/controllers/gpu/controller_test.go

@@ -24,6 +24,7 @@ import (
 	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/util/diff"
+	"k8s.io/apimachinery/pkg/util/intstr"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 
 	devicepluginv1 "github.com/intel/intel-device-plugins-for-kubernetes/pkg/apis/deviceplugin/v1"
@@ -38,6 +39,9 @@ func (c *controller) newDaemonSetExpected(rawObj client.Object) *apps.DaemonSet
 
 	yes := true
 	no := false
+	maxUnavailable := intstr.FromInt(1)
+	maxSurge := intstr.FromInt(0)
+
 	daemonSet := apps.DaemonSet{
 		TypeMeta: metav1.TypeMeta{
 			Kind:       "DaemonSet",
@@ -56,6 +60,13 @@ func (c *controller) newDaemonSetExpected(rawObj client.Object) *apps.DaemonSet
 					"app": appLabel,
 				},
 			},
+			UpdateStrategy: apps.DaemonSetUpdateStrategy{
+				Type: "RollingUpdate",
+				RollingUpdate: &apps.RollingUpdateDaemonSet{
+					MaxUnavailable: &maxUnavailable,
+					MaxSurge:       &maxSurge,
+				},
+			},
 			Template: v1.PodTemplateSpec{
 				ObjectMeta: metav1.ObjectMeta{
 					Labels: map[string]string{