mirror of
https://github.com/k3s-io/k3s.git
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67 lines
2.1 KiB
Go
67 lines
2.1 KiB
Go
// Apache License v2.0 (copyright Cloud Native Labs & Rancher Labs)
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// - modified from https://github.com/cloudnativelabs/kube-router/blob/73b1b03b32c5755b240f6c077bb097abe3888314/pkg/utils/node.go
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// +build !windows
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package utils
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import (
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"context"
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"errors"
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"fmt"
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"net"
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"os"
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apiv1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/client-go/kubernetes"
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)
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// GetNodeObject returns the node API object for the node
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func GetNodeObject(clientset kubernetes.Interface, hostnameOverride string) (*apiv1.Node, error) {
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// assuming kube-router is running as pod, first check env NODE_NAME
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nodeName := os.Getenv("NODE_NAME")
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if nodeName != "" {
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node, err := clientset.CoreV1().Nodes().Get(context.Background(), nodeName, metav1.GetOptions{})
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if err == nil {
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return node, nil
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}
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}
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// if env NODE_NAME is not set then check if node is register with hostname
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hostName, _ := os.Hostname()
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node, err := clientset.CoreV1().Nodes().Get(context.Background(), hostName, metav1.GetOptions{})
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if err == nil {
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return node, nil
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}
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// if env NODE_NAME is not set and node is not registered with hostname, then use host name override
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if hostnameOverride != "" {
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node, err = clientset.CoreV1().Nodes().Get(context.Background(), hostnameOverride, metav1.GetOptions{})
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if err == nil {
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return node, nil
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}
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}
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return nil, fmt.Errorf("failed to identify the node by NODE_NAME, hostname or --hostname-override")
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}
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// GetNodeIP returns the most valid external facing IP address for a node.
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// Order of preference:
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// 1. NodeInternalIP
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// 2. NodeExternalIP (Only set on cloud providers usually)
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func GetNodeIP(node *apiv1.Node) (net.IP, error) {
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addresses := node.Status.Addresses
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addressMap := make(map[apiv1.NodeAddressType][]apiv1.NodeAddress)
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for i := range addresses {
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addressMap[addresses[i].Type] = append(addressMap[addresses[i].Type], addresses[i])
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}
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if addresses, ok := addressMap[apiv1.NodeInternalIP]; ok {
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return net.ParseIP(addresses[0].Address), nil
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}
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if addresses, ok := addressMap[apiv1.NodeExternalIP]; ok {
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return net.ParseIP(addresses[0].Address), nil
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}
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return nil, errors.New("host IP unknown")
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}
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