/
tainter_taint.go
102 lines (81 loc) · 2.53 KB
/
tainter_taint.go
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package loadwatcher
import (
"fmt"
"github.com/golang/glog"
"github.com/mittwald/kubernetes-loadwatcher/pkg/jsonpatch"
"k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
)
func (t *Tainter) IsNodeTainted() (bool, error) {
node, err := t.client.CoreV1().Nodes().Get(t.nodeName, metav1.GetOptions{})
if err != nil {
return false, err
}
for i := range node.Spec.Taints {
if node.Spec.Taints[i].Key == TaintKey {
return true, nil
}
}
return false, nil
}
func (t *Tainter) TaintNode(evt LoadThresholdEvent) error {
node, err := t.client.CoreV1().Nodes().Get(t.nodeName, metav1.GetOptions{})
if err != nil {
return err
}
nodeCopy := node.DeepCopy()
if nodeCopy.Spec.Taints == nil {
nodeCopy.Spec.Taints = make([]v1.Taint, 0, 1)
}
for i := range nodeCopy.Spec.Taints {
if nodeCopy.Spec.Taints[i].Key == TaintKey {
glog.Infof("wanted to taint node %s, but taint already exists", nodeCopy.Name)
return nil
}
}
nodeCopy.Spec.Taints = append(nodeCopy.Spec.Taints, v1.Taint{
Key: TaintKey,
Value: "true",
Effect: v1.TaintEffectPreferNoSchedule,
})
_, err = t.client.CoreV1().Nodes().Update(nodeCopy)
t.recorder.Eventf(t.nodeRef, v1.EventTypeWarning, "LoadThresholdExceeded", "load5 on node was %.2f; exceeded threshold of %.2f. tainting node", evt.Load5, evt.LoadThreshold)
if err != nil {
t.recorder.Eventf(t.nodeRef, v1.EventTypeWarning, "NodePatchError", "could not patch node: %s", err.Error())
return err
}
return nil
}
func (t *Tainter) UntaintNode(evt LoadThresholdEvent) error {
node, err := t.client.CoreV1().Nodes().Get(t.nodeName, metav1.GetOptions{})
if err != nil {
return err
}
taintIndex := -1
for i, t := range node.Spec.Taints {
if t.Key == TaintKey {
taintIndex = i
break
}
}
if taintIndex == -1 {
glog.Infof("wanted to remove taint from node %s, but taint was already gone", node.Name)
return nil
}
t.recorder.Eventf(t.nodeRef, v1.EventTypeNormal, "LoadThresholdDeceeded", "load15 on node was %.2f; deceeded threshold of %.2f. untainting node", evt.Load15, evt.LoadThreshold)
_, err = t.client.CoreV1().Nodes().Patch(t.nodeName, types.JSONPatchType, jsonpatch.PatchList{{
Op: "test",
Path: fmt.Sprintf("/spec/taints/%d/key", taintIndex),
Value: TaintKey,
}, {
Op: "remove",
Path: fmt.Sprintf("/spec/taints/%d", taintIndex),
Value: "",
}}.ToJSON())
if err != nil {
t.recorder.Eventf(t.nodeRef, v1.EventTypeWarning, "NodePatchError", "could not patch node: %s", err.Error())
return err
}
return nil
}