mirror of https://github.com/k3s-io/k3s
131 lines
4.3 KiB
Go
131 lines
4.3 KiB
Go
// +build !providerless
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/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package azure
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import (
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"context"
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"fmt"
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"os"
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"strconv"
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"strings"
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"k8s.io/apimachinery/pkg/types"
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cloudprovider "k8s.io/cloud-provider"
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"k8s.io/klog/v2"
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azcache "k8s.io/legacy-cloud-providers/azure/cache"
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)
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// makeZone returns the zone value in format of <region>-<zone-id>.
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func (az *Cloud) makeZone(location string, zoneID int) string {
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return fmt.Sprintf("%s-%d", strings.ToLower(location), zoneID)
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}
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// isAvailabilityZone returns true if the zone is in format of <region>-<zone-id>.
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func (az *Cloud) isAvailabilityZone(zone string) bool {
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return strings.HasPrefix(zone, fmt.Sprintf("%s-", az.Location))
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}
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// GetZoneID returns the ID of zone from node's zone label.
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func (az *Cloud) GetZoneID(zoneLabel string) string {
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if !az.isAvailabilityZone(zoneLabel) {
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return ""
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}
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return strings.TrimPrefix(zoneLabel, fmt.Sprintf("%s-", az.Location))
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}
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// GetZone returns the Zone containing the current availability zone and locality region that the program is running in.
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// If the node is not running with availability zones, then it will fall back to fault domain.
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func (az *Cloud) GetZone(ctx context.Context) (cloudprovider.Zone, error) {
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if az.UseInstanceMetadata {
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metadata, err := az.metadata.GetMetadata(azcache.CacheReadTypeUnsafe)
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if err != nil {
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return cloudprovider.Zone{}, err
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}
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if metadata.Compute == nil {
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az.metadata.imsCache.Delete(metadataCacheKey)
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return cloudprovider.Zone{}, fmt.Errorf("failure of getting compute information from instance metadata")
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}
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zone := ""
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location := metadata.Compute.Location
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if metadata.Compute.Zone != "" {
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zoneID, err := strconv.Atoi(metadata.Compute.Zone)
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if err != nil {
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return cloudprovider.Zone{}, fmt.Errorf("failed to parse zone ID %q: %v", metadata.Compute.Zone, err)
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}
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zone = az.makeZone(location, zoneID)
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} else {
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klog.V(3).Infof("Availability zone is not enabled for the node, falling back to fault domain")
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zone = metadata.Compute.FaultDomain
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}
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return cloudprovider.Zone{
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FailureDomain: strings.ToLower(zone),
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Region: strings.ToLower(location),
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}, nil
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}
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// if UseInstanceMetadata is false, get Zone name by calling ARM
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hostname, err := os.Hostname()
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if err != nil {
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return cloudprovider.Zone{}, fmt.Errorf("failure getting hostname from kernel")
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}
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return az.VMSet.GetZoneByNodeName(strings.ToLower(hostname))
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}
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// GetZoneByProviderID implements Zones.GetZoneByProviderID
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// This is particularly useful in external cloud providers where the kubelet
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// does not initialize node data.
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func (az *Cloud) GetZoneByProviderID(ctx context.Context, providerID string) (cloudprovider.Zone, error) {
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if providerID == "" {
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return cloudprovider.Zone{}, errNodeNotInitialized
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}
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// Returns nil for unmanaged nodes because azure cloud provider couldn't fetch information for them.
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if az.IsNodeUnmanagedByProviderID(providerID) {
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klog.V(2).Infof("GetZoneByProviderID: omitting unmanaged node %q", providerID)
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return cloudprovider.Zone{}, nil
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}
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nodeName, err := az.VMSet.GetNodeNameByProviderID(providerID)
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if err != nil {
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return cloudprovider.Zone{}, err
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}
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return az.GetZoneByNodeName(ctx, nodeName)
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}
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// GetZoneByNodeName implements Zones.GetZoneByNodeName
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// This is particularly useful in external cloud providers where the kubelet
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// does not initialize node data.
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func (az *Cloud) GetZoneByNodeName(ctx context.Context, nodeName types.NodeName) (cloudprovider.Zone, error) {
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// Returns "" for unmanaged nodes because azure cloud provider couldn't fetch information for them.
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unmanaged, err := az.IsNodeUnmanaged(string(nodeName))
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if err != nil {
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return cloudprovider.Zone{}, err
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}
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if unmanaged {
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klog.V(2).Infof("GetZoneByNodeName: omitting unmanaged node %q", nodeName)
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return cloudprovider.Zone{}, nil
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}
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return az.VMSet.GetZoneByNodeName(string(nodeName))
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}
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