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k8sutil.go
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k8sutil.go
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/*
Copyright 2016 The Rook Authors. 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.
Some of the code below came from https://github.com/coreos/etcd-operator
which also has the apache 2.0 license.
*/
// Package k8sutil for Kubernetes helpers.
package k8sutil
import (
"fmt"
"github.com/coreos/pkg/capnslog"
"k8s.io/client-go/kubernetes"
"k8s.io/kubernetes/pkg/util/version"
)
var logger = capnslog.NewPackageLogger("github.com/rook/rook", "op-k8sutil")
const (
// V1Alpha1 version for kubernetes resources
V1Alpha1 = "v1alpha1"
// V1Beta1 version for kubernetes resources
V1Beta1 = "v1beta1"
// V1 version for kubernetes resources
V1 = "v1"
)
const (
// Namespace for rook
Namespace = "rook"
// CustomResourceGroup for rook CRD
CustomResourceGroup = "rook.io"
// DefaultNamespace for the cluster
DefaultNamespace = "default"
// DataDirVolume data dir volume
DataDirVolume = "rook-data"
// DataDir folder
DataDir = "/var/lib/rook"
// RookType for the CRD
RookType = "kubernetes.io/rook"
// PodNameEnvVar is the env variable for getting the pod name via downward api
PodNameEnvVar = "POD_NAME"
// PodNamespaceEnvVar is the env variable for getting the pod namespace via downward api
PodNamespaceEnvVar = "POD_NAMESPACE"
// NodeNameEnvVar is the env variable for getting the node via downward api
NodeNameEnvVar = "NODE_NAME"
)
// GetK8SVersion gets the version of the running K8S cluster
func GetK8SVersion(clientset kubernetes.Interface) (*version.Version, error) {
serverVersion, err := clientset.Discovery().ServerVersion()
if err != nil {
return nil, fmt.Errorf("Error getting server version: %v", err)
}
return version.MustParseSemantic(serverVersion.GitVersion), nil
}