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pod.go
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pod.go
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package utils
import (
"fmt"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/klog/v2"
)
// GetResourceRequest finds and returns the request value for a specific resource.
func GetResourceRequest(pod *v1.Pod, resource v1.ResourceName) int64 {
if resource == v1.ResourcePods {
return 1
}
requestQuantity := GetResourceRequestQuantity(pod, resource)
if resource == v1.ResourceCPU {
return requestQuantity.MilliValue()
}
return requestQuantity.Value()
}
// GetResourceRequestQuantity finds and returns the request quantity for a specific resource.
func GetResourceRequestQuantity(pod *v1.Pod, resourceName v1.ResourceName) resource.Quantity {
requestQuantity := resource.Quantity{}
switch resourceName {
case v1.ResourceCPU:
requestQuantity = resource.Quantity{Format: resource.DecimalSI}
case v1.ResourceMemory, v1.ResourceStorage, v1.ResourceEphemeralStorage:
requestQuantity = resource.Quantity{Format: resource.BinarySI}
default:
requestQuantity = resource.Quantity{Format: resource.DecimalSI}
}
for _, container := range pod.Spec.Containers {
if rQuantity, ok := container.Resources.Requests[resourceName]; ok {
requestQuantity.Add(rQuantity)
}
}
for _, container := range pod.Spec.InitContainers {
if rQuantity, ok := container.Resources.Requests[resourceName]; ok {
if requestQuantity.Cmp(rQuantity) < 0 {
requestQuantity = rQuantity.DeepCopy()
}
}
}
// We assume pod overhead feature gate is enabled.
// We can't import the scheduler settings so we will inherit the default.
if pod.Spec.Overhead != nil {
if podOverhead, ok := pod.Spec.Overhead[resourceName]; ok && !requestQuantity.IsZero() {
requestQuantity.Add(podOverhead)
}
}
return requestQuantity
}
// IsMirrorPod returns true if the pod is a Mirror Pod.
func IsMirrorPod(pod *v1.Pod) bool {
_, ok := pod.Annotations[v1.MirrorPodAnnotationKey]
return ok
}
// IsPodTerminating returns true if the pod DeletionTimestamp is set.
func IsPodTerminating(pod *v1.Pod) bool {
return pod.DeletionTimestamp != nil
}
// IsStaticPod returns true if the pod is a static pod.
func IsStaticPod(pod *v1.Pod) bool {
source, err := GetPodSource(pod)
return err == nil && source != "api"
}
// IsCriticalPriorityPod returns true if the pod has critical priority.
func IsCriticalPriorityPod(pod *v1.Pod) bool {
return pod.Spec.Priority != nil && *pod.Spec.Priority >= SystemCriticalPriority
}
// IsDaemonsetPod returns true if the pod is a IsDaemonsetPod.
func IsDaemonsetPod(ownerRefList []metav1.OwnerReference) bool {
for _, ownerRef := range ownerRefList {
if ownerRef.Kind == "DaemonSet" {
return true
}
}
return false
}
// IsPodWithLocalStorage returns true if the pod has local storage.
func IsPodWithLocalStorage(pod *v1.Pod) bool {
for _, volume := range pod.Spec.Volumes {
if volume.HostPath != nil || volume.EmptyDir != nil {
return true
}
}
return false
}
// IsPodWithPVC returns true if the pod has claimed a persistent volume.
func IsPodWithPVC(pod *v1.Pod) bool {
for _, volume := range pod.Spec.Volumes {
if volume.PersistentVolumeClaim != nil {
return true
}
}
return false
}
// GetPodSource returns the source of the pod based on the annotation.
func GetPodSource(pod *v1.Pod) (string, error) {
if pod.Annotations != nil {
if source, ok := pod.Annotations["kubernetes.io/config.source"]; ok {
return source, nil
}
}
return "", fmt.Errorf("cannot get source of pod %q", pod.UID)
}
// PodRequestsAndLimits returns a dictionary of all defined resources summed up for all
// containers of the pod. If PodOverhead feature is enabled, pod overhead is added to the
// total container resource requests and to the total container limits which have a
// non-zero quantity.
func PodRequestsAndLimits(pod *v1.Pod) (reqs, limits v1.ResourceList) {
reqs, limits = v1.ResourceList{}, v1.ResourceList{}
for _, container := range pod.Spec.Containers {
addResourceList(reqs, container.Resources.Requests)
addResourceList(limits, container.Resources.Limits)
}
// init containers define the minimum of any resource
for _, container := range pod.Spec.InitContainers {
maxResourceList(reqs, container.Resources.Requests)
maxResourceList(limits, container.Resources.Limits)
}
// We assume pod overhead feature gate is enabled.
// We can't import the scheduler settings so we will inherit the default.
if pod.Spec.Overhead != nil {
addResourceList(reqs, pod.Spec.Overhead)
for name, quantity := range pod.Spec.Overhead {
if value, ok := limits[name]; ok && !value.IsZero() {
value.Add(quantity)
limits[name] = value
}
}
}
return
}
// addResourceList adds the resources in newList to list
func addResourceList(list, newList v1.ResourceList) {
for name, quantity := range newList {
if value, ok := list[name]; !ok {
list[name] = quantity.DeepCopy()
} else {
value.Add(quantity)
list[name] = value
}
}
}
// maxResourceList sets list to the greater of list/newList for every resource
// either list
func maxResourceList(list, new v1.ResourceList) {
for name, quantity := range new {
if value, ok := list[name]; !ok {
list[name] = quantity.DeepCopy()
continue
} else {
if quantity.Cmp(value) > 0 {
list[name] = quantity.DeepCopy()
}
}
}
}
// PodToleratesTaints returns true if a pod tolerates one node's taints
func PodToleratesTaints(pod *v1.Pod, taintsOfNodes map[string][]v1.Taint) bool {
for nodeName, taintsForNode := range taintsOfNodes {
if len(pod.Spec.Tolerations) >= len(taintsForNode) {
if TolerationsTolerateTaintsWithFilter(pod.Spec.Tolerations, taintsForNode, nil) {
return true
}
if klog.V(5).Enabled() {
for i := range taintsForNode {
if !TolerationsTolerateTaint(pod.Spec.Tolerations, &taintsForNode[i]) {
klog.V(5).InfoS("Pod doesn't tolerate node taint",
"pod", klog.KObj(pod),
"nodeName", nodeName,
"taint", fmt.Sprintf("%s:%s=%s", taintsForNode[i].Key, taintsForNode[i].Value, taintsForNode[i].Effect),
)
}
}
}
} else {
klog.V(5).InfoS("Pod doesn't tolerate nodes taint, count mismatch",
"pod", klog.KObj(pod),
"nodeName", nodeName,
)
}
}
return false
}
// PodHasNodeAffinity returns true if the pod has a node affinity of type
// `nodeAffinityType` defined. The nodeAffinityType param can take this two values:
// "requiredDuringSchedulingIgnoredDuringExecution" or "requiredDuringSchedulingIgnoredDuringExecution"
func PodHasNodeAffinity(pod *v1.Pod, nodeAffinityType NodeAffinityType) bool {
if pod.Spec.Affinity == nil {
return false
}
if pod.Spec.Affinity.NodeAffinity == nil {
return false
}
if nodeAffinityType == RequiredDuringSchedulingIgnoredDuringExecution {
return pod.Spec.Affinity.NodeAffinity.RequiredDuringSchedulingIgnoredDuringExecution != nil
} else if nodeAffinityType == PreferredDuringSchedulingIgnoredDuringExecution {
return len(pod.Spec.Affinity.NodeAffinity.PreferredDuringSchedulingIgnoredDuringExecution) > 0
}
return false
}
type NodeAffinityType string
const (
RequiredDuringSchedulingIgnoredDuringExecution NodeAffinityType = "requiredDuringSchedulingIgnoredDuringExecution"
PreferredDuringSchedulingIgnoredDuringExecution NodeAffinityType = "preferredDuringSchedulingIgnoredDuringExecution"
)