forked from k3s-io/k3s
/
node_ipam_controller.go
134 lines (105 loc) · 3.87 KB
/
node_ipam_controller.go
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/*
Copyright 2014 The Kubernetes Authors.
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 nodeipam
import (
"net"
"github.com/golang/glog"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
v1core "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/api/core/v1"
coreinformers "k8s.io/client-go/informers/core/v1"
clientset "k8s.io/client-go/kubernetes"
corelisters "k8s.io/client-go/listers/core/v1"
"k8s.io/kubernetes/pkg/controller"
"k8s.io/kubernetes/pkg/controller/nodeipam/ipam"
"k8s.io/kubernetes/pkg/util/metrics"
)
func init() {
// Register prometheus metrics
Register()
}
// Controller is the controller that manages node ipam state.
type Controller struct {
allocatorType ipam.CIDRAllocatorType
clusterCIDR *net.IPNet
serviceCIDR *net.IPNet
kubeClient clientset.Interface
// Method for easy mocking in unittest.
lookupIP func(host string) ([]net.IP, error)
nodeLister corelisters.NodeLister
nodeInformerSynced cache.InformerSynced
cidrAllocator ipam.CIDRAllocator
forcefullyDeletePod func(*v1.Pod) error
}
// NewNodeIpamController returns a new node IP Address Management controller to
// sync instances from cloudprovider.
// This method returns an error if it is unable to initialize the CIDR bitmap with
// podCIDRs it has already allocated to nodes. Since we don't allow podCIDR changes
// currently, this should be handled as a fatal error.
func NewNodeIpamController(
nodeInformer coreinformers.NodeInformer,
kubeClient clientset.Interface,
clusterCIDR *net.IPNet,
serviceCIDR *net.IPNet,
nodeCIDRMaskSize int,
allocatorType ipam.CIDRAllocatorType) (*Controller, error) {
if kubeClient == nil {
glog.Fatalf("kubeClient is nil when starting Controller")
}
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartLogging(glog.Infof)
glog.V(0).Infof("Sending events to api server.")
eventBroadcaster.StartRecordingToSink(
&v1core.EventSinkImpl{
Interface: v1core.New(kubeClient.CoreV1().RESTClient()).Events(""),
})
if kubeClient != nil && kubeClient.CoreV1().RESTClient().GetRateLimiter() != nil {
metrics.RegisterMetricAndTrackRateLimiterUsage("node_ipam_controller", kubeClient.CoreV1().RESTClient().GetRateLimiter())
}
if clusterCIDR == nil {
glog.Fatal("Controller: Must specify --cluster-cidr if --allocate-node-cidrs is set")
}
mask := clusterCIDR.Mask
if maskSize, _ := mask.Size(); maskSize > nodeCIDRMaskSize {
glog.Fatal("Controller: Invalid --cluster-cidr, mask size of cluster CIDR must be less than --node-cidr-mask-size")
}
ic := &Controller{
kubeClient: kubeClient,
lookupIP: net.LookupIP,
clusterCIDR: clusterCIDR,
serviceCIDR: serviceCIDR,
allocatorType: allocatorType,
}
var err error
ic.cidrAllocator, err = ipam.New(
kubeClient, nodeInformer, ic.allocatorType, ic.clusterCIDR, ic.serviceCIDR, nodeCIDRMaskSize)
if err != nil {
return nil, err
}
ic.nodeLister = nodeInformer.Lister()
ic.nodeInformerSynced = nodeInformer.Informer().HasSynced
return ic, nil
}
// Run starts an asynchronous loop that monitors the status of cluster nodes.
func (nc *Controller) Run(stopCh <-chan struct{}) {
defer utilruntime.HandleCrash()
glog.Infof("Starting ipam controller")
defer glog.Infof("Shutting down ipam controller")
if !controller.WaitForCacheSync("node", stopCh, nc.nodeInformerSynced) {
return
}
go nc.cidrAllocator.Run(stopCh)
<-stopCh
}