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nodes.go
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nodes.go
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/*
* Copyright (c) 2019 SUSE LLC. All rights reserved.
*
* 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 kubernetes
import (
"fmt"
"k8s.io/klog"
"os/exec"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
kubeadmconstants "k8s.io/kubernetes/cmd/kubeadm/app/constants"
"github.com/SUSE/caaspctl/pkg/caaspctl"
)
func GetMasterNodes() (*v1.NodeList, error) {
return GetAdminClientSet().CoreV1().Nodes().List(metav1.ListOptions{
LabelSelector: fmt.Sprintf("%s=", kubeadmconstants.LabelNodeRoleMaster),
})
}
func IsMaster(node *v1.Node) bool {
_, isMaster := node.ObjectMeta.Labels[kubeadmconstants.LabelNodeRoleMaster]
return isMaster
}
func DrainNode(node *v1.Node) error {
// Drain node (shelling out, FIXME after https://github.com/kubernetes/kubernetes/pull/72827 can be used [1.14])
cmd := exec.Command("kubectl",
fmt.Sprintf("--kubeconfig=%s", caaspctl.KubeConfigAdminFile()),
"drain", "--delete-local-data=true", "--force=true", "--ignore-daemonsets=true", node.ObjectMeta.Name)
if err := cmd.Run(); err != nil {
klog.Infof("could not drain node %s, aborting (use --force if you want to ignore this error)\n", node.ObjectMeta.Name)
return err
} else {
klog.Infof("node %s correctly drained\n", node.ObjectMeta.Name)
}
return nil
}