Exemplo n.º 1
0
func (p *podNodeSelector) getNodeSelectorMap(namespace *api.Namespace) (labels.Set, error) {
	selector := labels.Set{}
	labelsMap := labels.Set{}
	var err error
	found := false
	if len(namespace.ObjectMeta.Annotations) > 0 {
		for _, annotation := range NamespaceNodeSelectors {
			if ns, ok := namespace.ObjectMeta.Annotations[annotation]; ok {
				labelsMap, err = labels.ConvertSelectorToLabelsMap(ns)
				if err != nil {
					return labels.Set{}, err
				}

				if labels.Conflicts(selector, labelsMap) {
					nsName := namespace.ObjectMeta.Name
					return labels.Set{}, fmt.Errorf("%s annotations' node label selectors conflict", nsName)
				}
				selector = labels.Merge(selector, labelsMap)
				found = true
			}
		}
	}
	if !found {
		selector, err = labels.ConvertSelectorToLabelsMap(p.clusterNodeSelectors["clusterDefaultNodeSelector"])
		if err != nil {
			return labels.Set{}, err
		}
	}
	return selector, nil
}
Exemplo n.º 2
0
// Admit enforces that pod and its namespace node label selectors matches at least a node in the cluster.
func (p *podNodeSelector) Admit(a admission.Attributes) error {
	resource := a.GetResource().GroupResource()
	if resource != api.Resource("pods") {
		return nil
	}
	if a.GetSubresource() != "" {
		// only run the checks below on pods proper and not subresources
		return nil
	}

	obj := a.GetObject()
	pod, ok := obj.(*api.Pod)
	if !ok {
		glog.Errorf("expected pod but got %s", a.GetKind().Kind)
		return nil
	}

	if !p.WaitForReady() {
		return admission.NewForbidden(a, fmt.Errorf("not yet ready to handle request"))
	}

	name := pod.Name
	nsName := a.GetNamespace()
	var namespace *api.Namespace

	namespaceObj, exists, err := p.namespaceInformer.GetStore().Get(&api.Namespace{
		ObjectMeta: api.ObjectMeta{
			Name:      nsName,
			Namespace: "",
		},
	})
	if err != nil {
		return errors.NewInternalError(err)
	}
	if exists {
		namespace = namespaceObj.(*api.Namespace)
	} else {
		namespace, err = p.defaultGetNamespace(nsName)
		if err != nil {
			if errors.IsNotFound(err) {
				return err
			}
			return errors.NewInternalError(err)
		}
	}
	namespaceNodeSelector, err := p.getNodeSelectorMap(namespace)
	if err != nil {
		return err
	}

	if labels.Conflicts(namespaceNodeSelector, labels.Set(pod.Spec.NodeSelector)) {
		return errors.NewForbidden(resource, name, fmt.Errorf("pod node label selector conflicts with its namespace node label selector"))
	}

	whitelist, err := labels.ConvertSelectorToLabelsMap(p.clusterNodeSelectors[namespace.Name])
	if err != nil {
		return err
	}

	// Merge pod node selector = namespace node selector + current pod node selector
	podNodeSelectorLabels := labels.Merge(namespaceNodeSelector, pod.Spec.NodeSelector)

	// whitelist verification
	if !labels.AreLabelsInWhiteList(podNodeSelectorLabels, whitelist) {
		return errors.NewForbidden(resource, name, fmt.Errorf("pod node label selector labels conflict with its namespace whitelist"))
	}

	// Updated pod node selector = namespace node selector + current pod node selector
	pod.Spec.NodeSelector = map[string]string(podNodeSelectorLabels)
	return nil
}