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node.go
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node.go
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package utils
import (
"fmt"
"os"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
apiv1 "k8s.io/client-go/pkg/api/v1"
)
func GetNodeObject(clientset *kubernetes.Clientset, hostnameOverride string) (*apiv1.Node, error) {
// assuming kube-router is running as pod, first check env NODE_NAME
nodeName := os.Getenv("NODE_NAME")
if nodeName != "" {
node, err := clientset.Core().Nodes().Get(nodeName, metav1.GetOptions{})
if err == nil {
return node, nil
}
}
// if env NODE_NAME is not set then check if node is register with hostname
hostName, _ := os.Hostname()
node, err := clientset.Core().Nodes().Get(hostName, metav1.GetOptions{})
if err == nil {
return node, nil
}
// if env NODE_NAME is not set and node is not registered with hostname, then use host name override
if hostnameOverride != "" {
node, err = clientset.Core().Nodes().Get(hostnameOverride, metav1.GetOptions{})
if err == nil {
return node, nil
}
}
return nil, fmt.Errorf("Failed to identify the node by NODE_NAME, hostname or --hostname-override")
}