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For kubelet, differentiate between the nodeName and the hostname

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This will allow us to use a nodeName that is not the hostname,
for example on clouds where the hostname is not the natural identifier
for a node.
This commit is contained in:
Justin Santa Barbara
2015-06-12 11:40:34 -04:00
parent 43889c612c
commit c28cdfbd43
6 changed files with 49 additions and 40 deletions
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43
pkg/kubelet/kubelet.go
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@@ -114,6 +114,7 @@ func waitUntilRuntimeIsUp(cr kubecontainer.Runtime, timeout time.Duration) error
// New creates a new Kubelet for use in main
func NewMainKubelet(
hostname string,
nodeName string,
dockerClient dockertools.DockerInterface,
kubeClient client.Interface,
rootDirectory string,
@@ -179,7 +180,7 @@ func NewMainKubelet(
if kubeClient != nil {
// TODO: cache.NewListWatchFromClient is limited as it takes a client implementation rather
// than an interface. There is no way to construct a list+watcher using resource name.
fieldSelector := fields.Set{client.ObjectNameField: hostname}.AsSelector()
fieldSelector := fields.Set{client.ObjectNameField: nodeName}.AsSelector()
listWatch := &cache.ListWatch{
ListFunc: func() (runtime.Object, error) {
return kubeClient.Nodes().List(labels.Everything(), fieldSelector)
@@ -197,8 +198,8 @@ func NewMainKubelet(
// TODO: what is namespace for node?
nodeRef := &api.ObjectReference{
Kind: "Node",
Name: hostname,
UID: types.UID(hostname),
Name: nodeName,
UID: types.UID(nodeName),
Namespace: "",
}
@@ -224,6 +225,7 @@ func NewMainKubelet(
klet := &Kubelet{
hostname: hostname,
nodeName: nodeName,
dockerClient: dockerClient,
kubeClient: kubeClient,
rootDirectory: rootDirectory,
@@ -362,6 +364,7 @@ type nodeLister interface {
// Kubelet is the main kubelet implementation.
type Kubelet struct {
hostname string
nodeName string
dockerClient dockertools.DockerInterface
runtimeCache kubecontainer.RuntimeCache
kubeClient client.Interface
@@ -637,13 +640,13 @@ func (kl *Kubelet) GetNode() (*api.Node, error) {
if err != nil {
return nil, errors.New("cannot list nodes")
}
host := kl.GetHostname()
nodeName := kl.nodeName
for _, n := range l.Items {
if n.Name == host {
if n.Name == nodeName {
return &n, nil
}
}
return nil, fmt.Errorf("node %v not found", host)
return nil, fmt.Errorf("node %v not found", nodeName)
}
// Starts garbage collection theads.
@@ -709,7 +712,7 @@ func (kl *Kubelet) Run(updates <-chan PodUpdate) {
func (kl *Kubelet) initialNodeStatus() (*api.Node, error) {
node := &api.Node{
ObjectMeta: api.ObjectMeta{
Name: kl.hostname,
Name: kl.nodeName,
Labels: map[string]string{"kubernetes.io/hostname": kl.hostname},
},
}
@@ -718,18 +721,20 @@ func (kl *Kubelet) initialNodeStatus() (*api.Node, error) {
if !ok {
return nil, fmt.Errorf("failed to get instances from cloud provider")
}
// TODO(roberthbailey): Can we do this without having credentials to talk
// to the cloud provider?
// TODO: ExternalID is deprecated, we'll have to drop this code
externalID, err := instances.ExternalID(kl.hostname)
externalID, err := instances.ExternalID(kl.nodeName)
if err != nil {
return nil, fmt.Errorf("failed to get external ID from cloud provider: %v", err)
}
node.Spec.ExternalID = externalID
// TODO: We can't assume that the node has credentials to talk to the
// cloudprovider from arbitrary nodes. At most, we should talk to a
// local metadata server here.
node.Spec.ProviderID, err = cloudprovider.GetInstanceProviderID(kl.cloud, kl.hostname)
node.Spec.ProviderID, err = cloudprovider.GetInstanceProviderID(kl.cloud, kl.nodeName)
if err != nil {
return nil, err
}
@@ -760,13 +765,13 @@ func (kl *Kubelet) registerWithApiserver() {
glog.V(2).Infof("Attempting to register node %s", node.Name)
if _, err := kl.kubeClient.Nodes().Create(node); err != nil {
if apierrors.IsAlreadyExists(err) {
currentNode, err := kl.kubeClient.Nodes().Get(kl.hostname)
currentNode, err := kl.kubeClient.Nodes().Get(kl.nodeName)
if err != nil {
glog.Errorf("error getting node %q: %v", kl.hostname, err)
glog.Errorf("error getting node %q: %v", kl.nodeName, err)
continue
}
if currentNode == nil {
glog.Errorf("no node instance returned for %q", kl.hostname)
glog.Errorf("no node instance returned for %q", kl.nodeName)
continue
}
if currentNode.Spec.ExternalID == node.Spec.ExternalID {
@@ -1824,10 +1829,10 @@ func (kl *Kubelet) updateNodeStatus() error {
}
func (kl *Kubelet) recordNodeStatusEvent(event string) {
glog.V(2).Infof("Recording %s event message for node %s", event, kl.hostname)
glog.V(2).Infof("Recording %s event message for node %s", event, kl.nodeName)
// TODO: This requires a transaction, either both node status is updated
// and event is recorded or neither should happen, see issue #6055.
kl.recorder.Eventf(kl.nodeRef, event, "Node %s status is now: %s", kl.hostname, event)
kl.recorder.Eventf(kl.nodeRef, event, "Node %s status is now: %s", kl.nodeName, event)
}
// Maintains Node.Spec.Unschedulable value from previous run of tryUpdateNodeStatus()
@@ -1844,7 +1849,7 @@ func (kl *Kubelet) setNodeStatus(node *api.Node) error {
}
// TODO(roberthbailey): Can we do this without having credentials to talk
// to the cloud provider?
nodeAddresses, err := instances.NodeAddresses(kl.hostname)
nodeAddresses, err := instances.NodeAddresses(kl.nodeName)
if err != nil {
return fmt.Errorf("failed to get node address from cloud provider: %v", err)
}
@@ -1898,7 +1903,7 @@ func (kl *Kubelet) setNodeStatus(node *api.Node) error {
// TODO: This requires a transaction, either both node status is updated
// and event is recorded or neither should happen, see issue #6055.
kl.recorder.Eventf(kl.nodeRef, "rebooted",
"Node %s has been rebooted, boot id: %s", kl.hostname, info.BootID)
"Node %s has been rebooted, boot id: %s", kl.nodeName, info.BootID)
}
node.Status.NodeInfo.BootID = info.BootID
}
@@ -1987,12 +1992,12 @@ func (kl *Kubelet) setNodeStatus(node *api.Node) error {
// tryUpdateNodeStatus tries to update node status to master. If ReconcileCBR0
// is set, this function will also confirm that cbr0 is configured correctly.
func (kl *Kubelet) tryUpdateNodeStatus() error {
node, err := kl.kubeClient.Nodes().Get(kl.hostname)
node, err := kl.kubeClient.Nodes().Get(kl.nodeName)
if err != nil {
return fmt.Errorf("error getting node %q: %v", kl.hostname, err)
return fmt.Errorf("error getting node %q: %v", kl.nodeName, err)
}
if node == nil {
return fmt.Errorf("no node instance returned for %q", kl.hostname)
return fmt.Errorf("no node instance returned for %q", kl.nodeName)
}
if err := kl.setNodeStatus(node); err != nil {
return err