Sok3t/descheduler
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Descheduler can evict all types of pods with special annotation

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When pod has this annotation, descheduler will always try to evict this pod.
User can control which pods (only pods with this annotation) will be evicted.
Signed-off-by: ksimon1 <ksimon@redhat.com>
This commit is contained in:
ksimon1
2019-10-03 16:41:07 +02:00
parent f1127541aa
commit dc7f9efc19
2 changed files with 15 additions and 2 deletions
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3
README.md
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@@ -259,6 +259,9 @@ never evicted because these pods won't be recreated.
* Pods associated with DaemonSets are never evicted. * Pods associated with DaemonSets are never evicted.
* Pods with local storage are never evicted. * Pods with local storage are never evicted.
* Best efforts pods are evicted before Burstable and Guaranteed pods. * Best efforts pods are evicted before Burstable and Guaranteed pods.
* All types of pods with annotation descheduler.alpha.kubernetes.io/evict are evicted. This
annotation is used to override checks which prevent eviction and user can select which pod is evicted.
User should know how and if the pod will be recreated.
### Pod disruption Budget (PDB) ### Pod disruption Budget (PDB)
Pods subject to Pod Disruption Budget (PDB) are not evicted if descheduling violates its pod Pods subject to Pod Disruption Budget (PDB) are not evicted if descheduling violates its pod

14
pkg/descheduler/pod/pods.go
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@@ -17,7 +17,7 @@ limitations under the License.
package pod package pod
import ( import (
"k8s.io/api/core/v1" v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields" "k8s.io/apimachinery/pkg/fields"
clientset "k8s.io/client-go/kubernetes" clientset "k8s.io/client-go/kubernetes"
@@ -26,6 +26,10 @@ import (
"k8s.io/kubernetes/pkg/kubelet/types" "k8s.io/kubernetes/pkg/kubelet/types"
) )
const (
evictPodAnnotationKey = "descheduler.alpha.kubernetes.io/evict"
)
// checkLatencySensitiveResourcesForAContainer checks if there are any latency sensitive resources like GPUs. // checkLatencySensitiveResourcesForAContainer checks if there are any latency sensitive resources like GPUs.
func checkLatencySensitiveResourcesForAContainer(rl v1.ResourceList) bool { func checkLatencySensitiveResourcesForAContainer(rl v1.ResourceList) bool {
if rl == nil { if rl == nil {
@@ -54,7 +58,7 @@ func IsLatencySensitivePod(pod *v1.Pod) bool {
// IsEvictable checks if a pod is evictable or not. // IsEvictable checks if a pod is evictable or not.
func IsEvictable(pod *v1.Pod, evictLocalStoragePods bool) bool { func IsEvictable(pod *v1.Pod, evictLocalStoragePods bool) bool {
ownerRefList := OwnerRef(pod) ownerRefList := OwnerRef(pod)
if IsMirrorPod(pod) || (!evictLocalStoragePods && IsPodWithLocalStorage(pod)) || len(ownerRefList) == 0 || IsDaemonsetPod(ownerRefList) || IsCriticalPod(pod) { if !HaveEvictAnnotation(pod) && (IsMirrorPod(pod) || (!evictLocalStoragePods && IsPodWithLocalStorage(pod)) || len(ownerRefList) == 0 || IsDaemonsetPod(ownerRefList) || IsCriticalPod(pod)) {
return false return false
} }
return true return true
@@ -127,6 +131,12 @@ func IsMirrorPod(pod *v1.Pod) bool {
return found return found
} }
// HaveEvictAnnotation checks if the pod have evict annotation
func HaveEvictAnnotation(pod *v1.Pod) bool {
_, found := pod.ObjectMeta.Annotations[evictPodAnnotationKey]
return found
}
func IsPodWithLocalStorage(pod *v1.Pod) bool { func IsPodWithLocalStorage(pod *v1.Pod) bool {
for _, volume := range pod.Spec.Volumes { for _, volume := range pod.Spec.Volumes {
if volume.HostPath != nil || volume.EmptyDir != nil { if volume.HostPath != nil || volume.EmptyDir != nil {