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Label nodes with Zone information, if available

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This lays the groundwork for simple multizone capabilities.

In a cloud environment, nodes are typically created by the kubelet
registering with the API server.  When creating a new node, we now query
the cloudprovider to see if it can provide Zone information, and if so
we add some well-known labels to the Node we are creating.
This commit is contained in:
Justin Santa Barbara 2015-11-05 14:32:06 -05:00
parent 4711a87323
commit b2c2d617cf
2 changed files with 37 additions and 0 deletions
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20
pkg/api/unversioned/well_known_labels.go Normal file
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@ -0,0 +1,20 @@
/*
Copyright 2015 The Kubernetes 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.
*/
package unversioned
const LabelZoneFailureDomain = "kubernetes.io/zone-failure-domain"
const LabelZoneRegion = "kubernetes.io/zone-region"

17
pkg/kubelet/kubelet.go
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@ -901,6 +901,23 @@ func (kl *Kubelet) initialNodeStatus() (*api.Node, error) {
if err != nil { if err != nil {
return nil, err return nil, err
} }
// If the cloud has zone information, label the node with the zone information
zones, ok := kl.cloud.Zones()
if ok {
zone, err := zones.GetZone()
if err != nil {
return nil, fmt.Errorf("failed to get zone from cloud provider: %v", err)
}
if zone.FailureDomain != "" {
glog.Infof("Adding node label from cloud provider: %s=%s", unversioned.LabelZoneFailureDomain, zone.FailureDomain)
node.ObjectMeta.Labels[unversioned.LabelZoneFailureDomain] = zone.FailureDomain
}
if zone.Region != "" {
glog.Infof("Adding node label from cloud provider: %s=%s", unversioned.LabelZoneRegion, zone.Region)
node.ObjectMeta.Labels[unversioned.LabelZoneRegion] = zone.Region
}
}
} else { } else {
node.Spec.ExternalID = kl.hostname node.Spec.ExternalID = kl.hostname
} }