99 lines
2.9 KiB
Go
99 lines
2.9 KiB
Go
/*
|
|
Copyright 2017 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package markmaster
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
|
|
"k8s.io/api/core/v1"
|
|
apierrs "k8s.io/apimachinery/pkg/api/errors"
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
"k8s.io/apimachinery/pkg/types"
|
|
"k8s.io/apimachinery/pkg/util/strategicpatch"
|
|
"k8s.io/apimachinery/pkg/util/wait"
|
|
clientset "k8s.io/client-go/kubernetes"
|
|
kubeadmconstants "k8s.io/kubernetes/cmd/kubeadm/app/constants"
|
|
kubeletapis "k8s.io/kubernetes/pkg/kubelet/apis"
|
|
)
|
|
|
|
// MarkMaster taints the master and sets the master label
|
|
func MarkMaster(client clientset.Interface, masterName string) error {
|
|
|
|
fmt.Printf("[markmaster] Will mark node %s as master by adding a label and a taint\n", masterName)
|
|
|
|
// Loop on every falsy return. Return with an error if raised. Exit successfully if true is returned.
|
|
return wait.Poll(kubeadmconstants.APICallRetryInterval, kubeadmconstants.MarkMasterTimeout, func() (bool, error) {
|
|
// First get the node object
|
|
n, err := client.CoreV1().Nodes().Get(masterName, metav1.GetOptions{})
|
|
if err != nil {
|
|
return false, nil
|
|
}
|
|
|
|
// The node may appear to have no labels at first,
|
|
// so we wait for it to get hostname label.
|
|
if _, found := n.ObjectMeta.Labels[kubeletapis.LabelHostname]; !found {
|
|
return false, nil
|
|
}
|
|
|
|
oldData, err := json.Marshal(n)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
|
|
// The master node should be tainted and labelled accordingly
|
|
markMasterNode(n)
|
|
|
|
newData, err := json.Marshal(n)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
|
|
patchBytes, err := strategicpatch.CreateTwoWayMergePatch(oldData, newData, v1.Node{})
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
|
|
if _, err := client.CoreV1().Nodes().Patch(n.Name, types.StrategicMergePatchType, patchBytes); err != nil {
|
|
if apierrs.IsConflict(err) {
|
|
fmt.Println("[markmaster] Temporarily unable to update master node metadata due to conflict (will retry)")
|
|
return false, nil
|
|
}
|
|
return false, err
|
|
}
|
|
|
|
fmt.Printf("[markmaster] Master %s tainted and labelled with key/value: %s=%q\n", masterName, kubeadmconstants.LabelNodeRoleMaster, "")
|
|
|
|
return true, nil
|
|
})
|
|
}
|
|
|
|
func markMasterNode(n *v1.Node) {
|
|
n.ObjectMeta.Labels[kubeadmconstants.LabelNodeRoleMaster] = ""
|
|
addTaintIfNotExists(n, kubeadmconstants.MasterTaint)
|
|
}
|
|
|
|
func addTaintIfNotExists(n *v1.Node, t v1.Taint) {
|
|
for _, taint := range n.Spec.Taints {
|
|
if taint == t {
|
|
return
|
|
}
|
|
}
|
|
|
|
n.Spec.Taints = append(n.Spec.Taints, t)
|
|
}
|