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eviction.go
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eviction.go
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package kubernetes
import (
"math/rand"
"github.com/golang/glog"
corev1 "k8s.io/api/core/v1"
policy "k8s.io/api/policy/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/client-go/kubernetes"
)
type nodeEvicter struct {
client kubernetes.Interface
node *Node
}
func (n *nodeEvicter) Process() error {
glog.Infof("Evicting node %s", n.node.Name)
err := n.markNodeUnschedulable()
if err != nil {
return err
}
pods, err := n.nodePods()
if err != nil {
return err
}
for _, p := range pods.Items {
err = n.evictPod(&p)
if err != nil {
return err
}
}
return nil
}
func (n *nodeEvicter) markNodeUnschedulable() error {
node := n.node
node.Spec.Unschedulable = true
_, err := n.client.CoreV1().Nodes().Update(node.Node)
return err
}
func (n *nodeEvicter) evictPod(pod *corev1.Pod) error {
return n.client.PolicyV1beta1().Evictions(pod.Namespace).Evict(&policy.Eviction{
ObjectMeta: pod.ObjectMeta,
})
}
func (n *nodeEvicter) nodePods() (*corev1.PodList, error) {
nodeName := n.node.ObjectMeta.Name
return n.client.CoreV1().Pods(metav1.NamespaceAll).List(metav1.ListOptions{
FieldSelector: fields.SelectorFromSet(fields.Set{"spec.nodeName": nodeName}).String(),
})
}
// EvictNodes finds a set number of random nodes to evict, and drains them of all their pods
func EvictNodes(client kubernetes.Interface, count int) (int, error) {
nodes, err := GetNodes(client)
if err != nil {
return 0, err
}
flagged := []*Node{}
notReady := map[string]*Node{}
for _, n := range nodes {
if !n.IsReady() {
notReady[n.Name] = n
} else if n.IsFlagged() {
flagged = append(flagged, n)
}
}
var evictedCount int
for len(flagged) > 0 && len(notReady) < count {
i := rand.Intn(len(flagged))
eNode := flagged[i]
ev := &nodeEvicter{client, eNode}
err := ev.Process()
if err != nil {
return evictedCount, err
}
notReady[eNode.Name] = eNode
flagged = append(flagged[:i], flagged[i+1:]...)
evictedCount = evictedCount + 1
}
return evictedCount, nil
}