mirror of
https://github.com/k3s-io/kubernetes.git
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247 lines
8.4 KiB
Go
247 lines
8.4 KiB
Go
/*
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Copyright 2015 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 route
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import (
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"fmt"
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"net"
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"sync"
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"time"
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"github.com/golang/glog"
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"k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/types"
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utilruntime "k8s.io/apimachinery/pkg/util/runtime"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/client-go/tools/cache"
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"k8s.io/kubernetes/pkg/api/v1"
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v1node "k8s.io/kubernetes/pkg/api/v1/node"
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"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
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coreinformers "k8s.io/kubernetes/pkg/client/informers/informers_generated/externalversions/core/v1"
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corelisters "k8s.io/kubernetes/pkg/client/listers/core/v1"
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"k8s.io/kubernetes/pkg/cloudprovider"
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"k8s.io/kubernetes/pkg/controller"
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"k8s.io/kubernetes/pkg/util/metrics"
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nodeutil "k8s.io/kubernetes/pkg/util/node"
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)
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const (
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// Maximal number of concurrent CreateRoute API calls.
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// TODO: This should be per-provider.
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maxConcurrentRouteCreations int = 200
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// Maximum number of retries of route creations.
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maxRetries int = 5
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// Maximum number of retries of node status update.
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updateNodeStatusMaxRetries int = 3
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)
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type RouteController struct {
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routes cloudprovider.Routes
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kubeClient clientset.Interface
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clusterName string
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clusterCIDR *net.IPNet
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nodeLister corelisters.NodeLister
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nodeListerSynced cache.InformerSynced
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}
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func New(routes cloudprovider.Routes, kubeClient clientset.Interface, nodeInformer coreinformers.NodeInformer, clusterName string, clusterCIDR *net.IPNet) *RouteController {
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if kubeClient != nil && kubeClient.Core().RESTClient().GetRateLimiter() != nil {
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metrics.RegisterMetricAndTrackRateLimiterUsage("route_controller", kubeClient.Core().RESTClient().GetRateLimiter())
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}
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rc := &RouteController{
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routes: routes,
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kubeClient: kubeClient,
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clusterName: clusterName,
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clusterCIDR: clusterCIDR,
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nodeLister: nodeInformer.Lister(),
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nodeListerSynced: nodeInformer.Informer().HasSynced,
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}
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return rc
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}
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func (rc *RouteController) Run(stopCh <-chan struct{}, syncPeriod time.Duration) {
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defer utilruntime.HandleCrash()
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glog.Info("Starting route controller")
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defer glog.Info("Shutting down route controller")
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if !controller.WaitForCacheSync("route", stopCh, rc.nodeListerSynced) {
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return
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}
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// TODO: If we do just the full Resync every 5 minutes (default value)
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// that means that we may wait up to 5 minutes before even starting
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// creating a route for it. This is bad.
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// We should have a watch on node and if we observe a new node (with CIDR?)
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// trigger reconciliation for that node.
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go wait.NonSlidingUntil(func() {
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if err := rc.reconcileNodeRoutes(); err != nil {
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glog.Errorf("Couldn't reconcile node routes: %v", err)
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}
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}, syncPeriod, wait.NeverStop)
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<-stopCh
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}
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func (rc *RouteController) reconcileNodeRoutes() error {
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routeList, err := rc.routes.ListRoutes(rc.clusterName)
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if err != nil {
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return fmt.Errorf("error listing routes: %v", err)
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}
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nodes, err := rc.nodeLister.List(labels.Everything())
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if err != nil {
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return fmt.Errorf("error listing nodes: %v", err)
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}
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return rc.reconcile(nodes, routeList)
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}
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func (rc *RouteController) reconcile(nodes []*v1.Node, routes []*cloudprovider.Route) error {
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// nodeCIDRs maps nodeName->nodeCIDR
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nodeCIDRs := make(map[types.NodeName]string)
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// routeMap maps routeTargetNode->route
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routeMap := make(map[types.NodeName]*cloudprovider.Route)
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for _, route := range routes {
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routeMap[route.TargetNode] = route
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}
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wg := sync.WaitGroup{}
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rateLimiter := make(chan struct{}, maxConcurrentRouteCreations)
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for _, node := range nodes {
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// Skip if the node hasn't been assigned a CIDR yet.
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if node.Spec.PodCIDR == "" {
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continue
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}
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nodeName := types.NodeName(node.Name)
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// Check if we have a route for this node w/ the correct CIDR.
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r := routeMap[nodeName]
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if r == nil || r.DestinationCIDR != node.Spec.PodCIDR {
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// If not, create the route.
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route := &cloudprovider.Route{
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TargetNode: nodeName,
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DestinationCIDR: node.Spec.PodCIDR,
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}
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nameHint := string(node.UID)
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wg.Add(1)
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go func(nodeName types.NodeName, nameHint string, route *cloudprovider.Route) {
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defer wg.Done()
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for i := 0; i < maxRetries; i++ {
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startTime := time.Now()
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// Ensure that we don't have more than maxConcurrentRouteCreations
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// CreateRoute calls in flight.
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rateLimiter <- struct{}{}
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glog.Infof("Creating route for node %s %s with hint %s, throttled %v", nodeName, route.DestinationCIDR, nameHint, time.Now().Sub(startTime))
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err := rc.routes.CreateRoute(rc.clusterName, nameHint, route)
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<-rateLimiter
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rc.updateNetworkingCondition(nodeName, err == nil)
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if err != nil {
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glog.Errorf("Could not create route %s %s for node %s after %v: %v", nameHint, route.DestinationCIDR, nodeName, time.Now().Sub(startTime), err)
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} else {
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glog.Infof("Created route for node %s %s with hint %s after %v", nodeName, route.DestinationCIDR, nameHint, time.Now().Sub(startTime))
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return
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}
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}
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}(nodeName, nameHint, route)
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} else {
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// Update condition only if it doesn't reflect the current state.
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_, condition := v1node.GetNodeCondition(&node.Status, v1.NodeNetworkUnavailable)
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if condition == nil || condition.Status != v1.ConditionFalse {
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rc.updateNetworkingCondition(types.NodeName(node.Name), true)
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}
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}
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nodeCIDRs[nodeName] = node.Spec.PodCIDR
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}
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for _, route := range routes {
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if rc.isResponsibleForRoute(route) {
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// Check if this route applies to a node we know about & has correct CIDR.
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if nodeCIDRs[route.TargetNode] != route.DestinationCIDR {
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wg.Add(1)
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// Delete the route.
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go func(route *cloudprovider.Route, startTime time.Time) {
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glog.Infof("Deleting route %s %s", route.Name, route.DestinationCIDR)
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if err := rc.routes.DeleteRoute(rc.clusterName, route); err != nil {
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glog.Errorf("Could not delete route %s %s after %v: %v", route.Name, route.DestinationCIDR, time.Now().Sub(startTime), err)
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} else {
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glog.Infof("Deleted route %s %s after %v", route.Name, route.DestinationCIDR, time.Now().Sub(startTime))
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}
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wg.Done()
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}(route, time.Now())
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}
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}
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}
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wg.Wait()
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return nil
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}
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func (rc *RouteController) updateNetworkingCondition(nodeName types.NodeName, routeCreated bool) error {
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var err error
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for i := 0; i < updateNodeStatusMaxRetries; i++ {
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// Patch could also fail, even though the chance is very slim. So we still do
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// patch in the retry loop.
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currentTime := metav1.Now()
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if routeCreated {
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err = nodeutil.SetNodeCondition(rc.kubeClient, nodeName, v1.NodeCondition{
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Type: v1.NodeNetworkUnavailable,
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Status: v1.ConditionFalse,
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Reason: "RouteCreated",
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Message: "RouteController created a route",
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LastTransitionTime: currentTime,
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})
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} else {
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err = nodeutil.SetNodeCondition(rc.kubeClient, nodeName, v1.NodeCondition{
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Type: v1.NodeNetworkUnavailable,
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Status: v1.ConditionTrue,
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Reason: "NoRouteCreated",
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Message: "RouteController failed to create a route",
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LastTransitionTime: currentTime,
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})
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}
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if err == nil {
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return nil
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}
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if !errors.IsConflict(err) {
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glog.Errorf("Error updating node %s: %v", nodeName, err)
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return err
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}
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glog.Errorf("Error updating node %s, retrying: %v", nodeName, err)
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}
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glog.Errorf("Error updating node %s: %v", nodeName, err)
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return err
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}
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func (rc *RouteController) isResponsibleForRoute(route *cloudprovider.Route) bool {
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_, cidr, err := net.ParseCIDR(route.DestinationCIDR)
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if err != nil {
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glog.Errorf("Ignoring route %s, unparsable CIDR: %v", route.Name, err)
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return false
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}
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// Not responsible if this route's CIDR is not within our clusterCIDR
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lastIP := make([]byte, len(cidr.IP))
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for i := range lastIP {
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lastIP[i] = cidr.IP[i] | ^cidr.Mask[i]
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}
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if !rc.clusterCIDR.Contains(cidr.IP) || !rc.clusterCIDR.Contains(lastIP) {
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return false
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}
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return true
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}
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