While calculating pod's cpu limits, need to count in init-container.

Need to count in init-container when calculating a pod's cpu limits.
Otherwise, may cause pod start failure due to "invalid argument"
error while trying to write "cpu.cfs_quota_us" file.

pkg/kubelet/cm/helpers_linux.go

@@ -26,6 +26,7 @@ import (
 	libcontainercgroups "github.com/opencontainers/runc/libcontainer/cgroups"
 
 	"k8s.io/kubernetes/pkg/api/v1"
+	"k8s.io/kubernetes/pkg/api/v1/resource"
 	"k8s.io/kubernetes/pkg/kubelet/qos"
 )
 
@@ -84,28 +85,41 @@ func MilliCPUToShares(milliCPU int64) int64 {
 
 // ResourceConfigForPod takes the input pod and outputs the cgroup resource config.
 func ResourceConfigForPod(pod *v1.Pod) *ResourceConfig {
-	// sum requests and limits, track if limits were applied for each resource.
+	// sum requests and limits.
+	reqs, limits, err := resource.PodRequestsAndLimits(pod)
+	if err != nil {
+		return &ResourceConfig{}
+	}
+
 	cpuRequests := int64(0)
 	cpuLimits := int64(0)
 	memoryLimits := int64(0)
-	memoryLimitsDeclared := true
-	cpuLimitsDeclared := true
-	for _, container := range pod.Spec.Containers {
-		cpuRequests += container.Resources.Requests.Cpu().MilliValue()
-		cpuLimits += container.Resources.Limits.Cpu().MilliValue()
-		if container.Resources.Limits.Cpu().IsZero() {
-			cpuLimitsDeclared = false
+	if request, found := reqs[v1.ResourceCPU]; found {
+		cpuRequests = request.MilliValue()
 	}
-		memoryLimits += container.Resources.Limits.Memory().Value()
-		if container.Resources.Limits.Memory().IsZero() {
-			memoryLimitsDeclared = false
+	if limit, found := limits[v1.ResourceCPU]; found {
+		cpuLimits = limit.MilliValue()
 	}
+	if limit, found := limits[v1.ResourceMemory]; found {
+		memoryLimits = limit.Value()
 	}
 
 	// convert to CFS values
 	cpuShares := MilliCPUToShares(cpuRequests)
 	cpuQuota, cpuPeriod := MilliCPUToQuota(cpuLimits)
 
+	// track if limits were applied for each resource.
+	memoryLimitsDeclared := true
+	cpuLimitsDeclared := true
+	for _, container := range pod.Spec.Containers {
+		if container.Resources.Limits.Cpu().IsZero() {
+			cpuLimitsDeclared = false
+		}
+		if container.Resources.Limits.Memory().IsZero() {
+			memoryLimitsDeclared = false
+		}
+	}
+
 	// determine the qos class
 	qosClass := qos.GetPodQOS(pod)