Update limit ranging to handle init containers

plugin/pkg/admission/limitranger/admission.go

@@ -208,13 +208,8 @@ func defaultContainerResourceRequirements(limitRange *api.LimitRange) api.Resour
 	return requirements
 }
 
-// mergePodResourceRequirements merges enumerated requirements with default requirements
+// mergeContainerResources handles defaulting all of the resources on a container.
-// it annotates the pod with information about what requirements were modified
+func mergeContainerResources(container *api.Container, defaultRequirements *api.ResourceRequirements, annotationPrefix string, annotations []string) []string {
-func mergePodResourceRequirements(pod *api.Pod, defaultRequirements *api.ResourceRequirements) {
-	annotations := []string{}
-
-	for i := range pod.Spec.Containers {
-		container := &pod.Spec.Containers[i]
 	setRequests := []string{}
 	setLimits := []string{}
 	if container.Resources.Limits == nil {
@@ -239,14 +234,28 @@ func mergePodResourceRequirements(pod *api.Pod, defaultRequirements *api.Resourc
 	}
 	if len(setRequests) > 0 {
 		sort.Strings(setRequests)
-			a := strings.Join(setRequests, ", ") + " request for container " + container.Name
+		a := strings.Join(setRequests, ", ") + fmt.Sprintf(" request for %s %s", annotationPrefix, container.Name)
 		annotations = append(annotations, a)
 	}
 	if len(setLimits) > 0 {
 		sort.Strings(setLimits)
-			a := strings.Join(setLimits, ", ") + " limit for container " + container.Name
+		a := strings.Join(setLimits, ", ") + fmt.Sprintf(" limit for %s %s", annotationPrefix, container.Name)
 		annotations = append(annotations, a)
 	}
+	return annotations
+}
+
+// mergePodResourceRequirements merges enumerated requirements with default requirements
+// it annotates the pod with information about what requirements were modified
+func mergePodResourceRequirements(pod *api.Pod, defaultRequirements *api.ResourceRequirements) {
+	annotations := []string{}
+
+	for i := range pod.Spec.Containers {
+		annotations = mergeContainerResources(&pod.Spec.Containers[i], defaultRequirements, "container", annotations)
+	}
+
+	for i := range pod.Spec.InitContainers {
+		annotations = mergeContainerResources(&pod.Spec.InitContainers[i], defaultRequirements, "init container", annotations)
 	}
 
 	if len(annotations) > 0 {
@@ -441,7 +450,7 @@ func PodLimitFunc(limitRange *api.LimitRange, pod *api.Pod) error {
 			}
 		}
 
-		// enforce pod limits
+		// enforce pod limits on init containers
 		if limitType == api.LimitTypePod {
 			containerRequests, containerLimits := []api.ResourceList{}, []api.ResourceList{}
 			for j := range pod.Spec.Containers {
@@ -451,6 +460,28 @@ func PodLimitFunc(limitRange *api.LimitRange, pod *api.Pod) error {
 			}
 			podRequests := sum(containerRequests)
 			podLimits := sum(containerLimits)
+			for j := range pod.Spec.InitContainers {
+				container := &pod.Spec.InitContainers[j]
+				// take max(sum_containers, any_init_container)
+				for k, v := range container.Resources.Requests {
+					if v2, ok := podRequests[k]; ok {
+						if v.Cmp(v2) > 0 {
+							podRequests[k] = v
+						}
+					} else {
+						podRequests[k] = v
+					}
+				}
+				for k, v := range container.Resources.Limits {
+					if v2, ok := podLimits[k]; ok {
+						if v.Cmp(v2) > 0 {
+							podLimits[k] = v
+						}
+					} else {
+						podLimits[k] = v
+					}
+				}
+			}
 			for k, v := range limit.Min {
 				if err := minConstraint(limitType, k, v, podRequests, podLimits); err != nil {
 					errs = append(errs, err)

plugin/pkg/admission/limitranger/admission_test.go

@@ -134,6 +134,17 @@ func validPod(name string, numContainers int, resources api.ResourceRequirements
 	return pod
 }
 
+func validPodInit(pod api.Pod, resources ...api.ResourceRequirements) api.Pod {
+	for i := 0; i < len(resources); i++ {
+		pod.Spec.InitContainers = append(pod.Spec.InitContainers, api.Container{
+			Image:     "foo:V" + strconv.Itoa(i),
+			Resources: resources[i],
+			Name:      "foo-" + strconv.Itoa(i),
+		})
+	}
+	return pod
+}
+
 func TestDefaultContainerResourceRequirements(t *testing.T) {
 	limitRange := validLimitRange()
 	expected := api.ResourceRequirements{
@@ -183,7 +194,7 @@ func TestMergePodResourceRequirements(t *testing.T) {
 
 	// pod with some resources enumerated should only merge empty
 	input := getResourceRequirements(getResourceList("", "512Mi"), getResourceList("", ""))
-	pod = validPod("limit-memory", 1, input)
+	pod = validPodInit(validPod("limit-memory", 1, input), input)
 	expected = api.ResourceRequirements{
 		Requests: api.ResourceList{
 			api.ResourceCPU:    defaultRequirements.Requests[api.ResourceCPU],
@@ -198,11 +209,18 @@ func TestMergePodResourceRequirements(t *testing.T) {
 			t.Errorf("pod %v, expected != actual; %v != %v", pod.Name, expected, actual)
 		}
 	}
+	for i := range pod.Spec.InitContainers {
+		actual := pod.Spec.InitContainers[i].Resources
+		if !api.Semantic.DeepEqual(expected, actual) {
+			t.Errorf("pod %v, expected != actual; %v != %v", pod.Name, expected, actual)
+		}
+	}
 	verifyAnnotation(t, &pod, "LimitRanger plugin set: cpu request for container foo-0; cpu, memory limit for container foo-0")
 
 	// pod with all resources enumerated should not merge anything
 	input = getResourceRequirements(getResourceList("100m", "512Mi"), getResourceList("200m", "1G"))
-	pod = validPod("limit-memory", 1, input)
+	initInputs := []api.ResourceRequirements{getResourceRequirements(getResourceList("200m", "1G"), getResourceList("400m", "2G"))}
+	pod = validPodInit(validPod("limit-memory", 1, input), initInputs...)
 	expected = input
 	mergePodResourceRequirements(&pod, &defaultRequirements)
 	for i := range pod.Spec.Containers {
@@ -211,6 +229,12 @@ func TestMergePodResourceRequirements(t *testing.T) {
 			t.Errorf("pod %v, expected != actual; %v != %v", pod.Name, expected, actual)
 		}
 	}
+	for i := range pod.Spec.InitContainers {
+		actual := pod.Spec.InitContainers[i].Resources
+		if !api.Semantic.DeepEqual(initInputs[i], actual) {
+			t.Errorf("pod %v, expected != actual; %v != %v", pod.Name, initInputs[i], actual)
+		}
+	}
 	expectNoAnnotation(t, &pod)
 }
 
@@ -273,6 +297,20 @@ func TestPodLimitFunc(t *testing.T) {
 			pod:        validPod("pod-min-memory-request-limit", 2, getResourceRequirements(getResourceList("", "60Mi"), getResourceList("", "100Mi"))),
 			limitRange: createLimitRange(api.LimitTypePod, getResourceList("", "100Mi"), api.ResourceList{}, api.ResourceList{}, api.ResourceList{}, api.ResourceList{}),
 		},
+		{
+			pod: validPodInit(
+				validPod("pod-init-min-memory-request", 2, getResourceRequirements(getResourceList("", "60Mi"), getResourceList("", ""))),
+				getResourceRequirements(getResourceList("", "100Mi"), getResourceList("", "")),
+			),
+			limitRange: createLimitRange(api.LimitTypePod, getResourceList("", "100Mi"), api.ResourceList{}, api.ResourceList{}, api.ResourceList{}, api.ResourceList{}),
+		},
+		{
+			pod: validPodInit(
+				validPod("pod-init-min-memory-request-limit", 2, getResourceRequirements(getResourceList("", "60Mi"), getResourceList("", "100Mi"))),
+				getResourceRequirements(getResourceList("", "80Mi"), getResourceList("", "100Mi")),
+			),
+			limitRange: createLimitRange(api.LimitTypePod, getResourceList("", "100Mi"), api.ResourceList{}, api.ResourceList{}, api.ResourceList{}, api.ResourceList{}),
+		},
 		{
 			pod:        validPod("pod-max-cpu-request-limit", 2, getResourceRequirements(getResourceList("500m", ""), getResourceList("1", ""))),
 			limitRange: createLimitRange(api.LimitTypePod, api.ResourceList{}, getResourceList("2", ""), api.ResourceList{}, api.ResourceList{}, api.ResourceList{}),
@@ -281,6 +319,22 @@ func TestPodLimitFunc(t *testing.T) {
 			pod:        validPod("pod-max-cpu-limit", 2, getResourceRequirements(getResourceList("", ""), getResourceList("1", ""))),
 			limitRange: createLimitRange(api.LimitTypePod, api.ResourceList{}, getResourceList("2", ""), api.ResourceList{}, api.ResourceList{}, api.ResourceList{}),
 		},
+		{
+			pod: validPodInit(
+				validPod("pod-init-max-cpu-request-limit", 2, getResourceRequirements(getResourceList("500m", ""), getResourceList("1", ""))),
+				getResourceRequirements(getResourceList("1", ""), getResourceList("2", "")),
+				getResourceRequirements(getResourceList("1", ""), getResourceList("1", "")),
+			),
+			limitRange: createLimitRange(api.LimitTypePod, api.ResourceList{}, getResourceList("2", ""), api.ResourceList{}, api.ResourceList{}, api.ResourceList{}),
+		},
+		{
+			pod: validPodInit(
+				validPod("pod-init-max-cpu-limit", 2, getResourceRequirements(getResourceList("", ""), getResourceList("1", ""))),
+				getResourceRequirements(getResourceList("", ""), getResourceList("2", "")),
+				getResourceRequirements(getResourceList("", ""), getResourceList("2", "")),
+			),
+			limitRange: createLimitRange(api.LimitTypePod, api.ResourceList{}, getResourceList("2", ""), api.ResourceList{}, api.ResourceList{}, api.ResourceList{}),
+		},
 		{
 			pod:        validPod("pod-max-mem-request-limit", 2, getResourceRequirements(getResourceList("", "250Mi"), getResourceList("", "500Mi"))),
 			limitRange: createLimitRange(api.LimitTypePod, api.ResourceList{}, getResourceList("", "1Gi"), api.ResourceList{}, api.ResourceList{}, api.ResourceList{}),
@@ -387,6 +441,13 @@ func TestPodLimitFunc(t *testing.T) {
 			pod:        validPod("pod-max-mem-limit", 3, getResourceRequirements(getResourceList("", ""), getResourceList("", "500Mi"))),
 			limitRange: createLimitRange(api.LimitTypePod, api.ResourceList{}, getResourceList("", "1Gi"), api.ResourceList{}, api.ResourceList{}, api.ResourceList{}),
 		},
+		{
+			pod: validPodInit(
+				validPod("pod-init-max-mem-limit", 1, getResourceRequirements(getResourceList("", ""), getResourceList("", "500Mi"))),
+				getResourceRequirements(getResourceList("", ""), getResourceList("", "1.5Gi")),
+			),
+			limitRange: createLimitRange(api.LimitTypePod, api.ResourceList{}, getResourceList("", "1Gi"), api.ResourceList{}, api.ResourceList{}, api.ResourceList{}),
+		},
 		{
 			pod:        validPod("pod-max-mem-ratio", 3, getResourceRequirements(getResourceList("", "250Mi"), getResourceList("", "500Mi"))),
 			limitRange: createLimitRange(api.LimitTypePod, api.ResourceList{}, getResourceList("", "2Gi"), api.ResourceList{}, api.ResourceList{}, getResourceList("", "1.5")),
@@ -403,7 +464,7 @@ func TestPodLimitFunc(t *testing.T) {
 
 func TestPodLimitFuncApplyDefault(t *testing.T) {
 	limitRange := validLimitRange()
-	testPod := validPod("foo", 1, getResourceRequirements(api.ResourceList{}, api.ResourceList{}))
+	testPod := validPodInit(validPod("foo", 1, getResourceRequirements(api.ResourceList{}, api.ResourceList{})), getResourceRequirements(api.ResourceList{}, api.ResourceList{}))
 	err := PodLimitFunc(&limitRange, &testPod)
 	if err != nil {
 		t.Errorf("Unexpected error for valid pod: %v, %v", testPod.Name, err)
@@ -429,6 +490,27 @@ func TestPodLimitFuncApplyDefault(t *testing.T) {
 			t.Errorf("Unexpected cpu value %s", requestCpu)
 		}
 	}
+
+	for i := range testPod.Spec.InitContainers {
+		container := testPod.Spec.InitContainers[i]
+		limitMemory := container.Resources.Limits.Memory().String()
+		limitCpu := container.Resources.Limits.Cpu().String()
+		requestMemory := container.Resources.Requests.Memory().String()
+		requestCpu := container.Resources.Requests.Cpu().String()
+
+		if limitMemory != "10Mi" {
+			t.Errorf("Unexpected memory value %s", limitMemory)
+		}
+		if limitCpu != "75m" {
+			t.Errorf("Unexpected cpu value %s", limitCpu)
+		}
+		if requestMemory != "5Mi" {
+			t.Errorf("Unexpected memory value %s", requestMemory)
+		}
+		if requestCpu != "50m" {
+			t.Errorf("Unexpected cpu value %s", requestCpu)
+		}
+	}
 }
 
 func TestLimitRangerIgnoresSubresource(t *testing.T) {