mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-22 21:10:22 +00:00
286 lines
11 KiB
Go
286 lines
11 KiB
Go
/*
|
|
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 master
|
|
|
|
import (
|
|
"fmt"
|
|
"net"
|
|
"time"
|
|
|
|
"github.com/golang/glog"
|
|
"k8s.io/apimachinery/pkg/api/errors"
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
"k8s.io/apimachinery/pkg/util/intstr"
|
|
utilnet "k8s.io/apimachinery/pkg/util/net"
|
|
"k8s.io/apimachinery/pkg/util/runtime"
|
|
"k8s.io/apimachinery/pkg/util/wait"
|
|
genericapiserver "k8s.io/apiserver/pkg/server"
|
|
api "k8s.io/kubernetes/pkg/apis/core"
|
|
coreclient "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/core/internalversion"
|
|
"k8s.io/kubernetes/pkg/master/reconcilers"
|
|
"k8s.io/kubernetes/pkg/registry/core/rangeallocation"
|
|
corerest "k8s.io/kubernetes/pkg/registry/core/rest"
|
|
servicecontroller "k8s.io/kubernetes/pkg/registry/core/service/ipallocator/controller"
|
|
portallocatorcontroller "k8s.io/kubernetes/pkg/registry/core/service/portallocator/controller"
|
|
"k8s.io/kubernetes/pkg/util/async"
|
|
)
|
|
|
|
const kubernetesServiceName = "kubernetes"
|
|
|
|
// Controller is the controller manager for the core bootstrap Kubernetes
|
|
// controller loops, which manage creating the "kubernetes" service, the
|
|
// "default", "kube-system" and "kube-public" namespaces, and provide the IP
|
|
// repair check on service IPs
|
|
type Controller struct {
|
|
ServiceClient coreclient.ServicesGetter
|
|
NamespaceClient coreclient.NamespacesGetter
|
|
EventClient coreclient.EventsGetter
|
|
|
|
ServiceClusterIPRegistry rangeallocation.RangeRegistry
|
|
ServiceClusterIPInterval time.Duration
|
|
ServiceClusterIPRange net.IPNet
|
|
|
|
ServiceNodePortRegistry rangeallocation.RangeRegistry
|
|
ServiceNodePortInterval time.Duration
|
|
ServiceNodePortRange utilnet.PortRange
|
|
|
|
EndpointReconciler reconcilers.EndpointReconciler
|
|
EndpointInterval time.Duration
|
|
|
|
SystemNamespaces []string
|
|
SystemNamespacesInterval time.Duration
|
|
|
|
PublicIP net.IP
|
|
|
|
// ServiceIP indicates where the kubernetes service will live. It may not be nil.
|
|
ServiceIP net.IP
|
|
ServicePort int
|
|
ExtraServicePorts []api.ServicePort
|
|
ExtraEndpointPorts []api.EndpointPort
|
|
PublicServicePort int
|
|
KubernetesServiceNodePort int
|
|
|
|
runner *async.Runner
|
|
}
|
|
|
|
// NewBootstrapController returns a controller for watching the core capabilities of the master
|
|
func (c *completedConfig) NewBootstrapController(legacyRESTStorage corerest.LegacyRESTStorage, serviceClient coreclient.ServicesGetter, nsClient coreclient.NamespacesGetter, eventClient coreclient.EventsGetter) *Controller {
|
|
return &Controller{
|
|
ServiceClient: serviceClient,
|
|
NamespaceClient: nsClient,
|
|
EventClient: eventClient,
|
|
|
|
EndpointReconciler: c.ExtraConfig.EndpointReconcilerConfig.Reconciler,
|
|
EndpointInterval: c.ExtraConfig.EndpointReconcilerConfig.Interval,
|
|
|
|
SystemNamespaces: []string{metav1.NamespaceSystem, metav1.NamespacePublic},
|
|
SystemNamespacesInterval: 1 * time.Minute,
|
|
|
|
ServiceClusterIPRegistry: legacyRESTStorage.ServiceClusterIPAllocator,
|
|
ServiceClusterIPRange: c.ExtraConfig.ServiceIPRange,
|
|
ServiceClusterIPInterval: 3 * time.Minute,
|
|
|
|
ServiceNodePortRegistry: legacyRESTStorage.ServiceNodePortAllocator,
|
|
ServiceNodePortRange: c.ExtraConfig.ServiceNodePortRange,
|
|
ServiceNodePortInterval: 3 * time.Minute,
|
|
|
|
PublicIP: c.GenericConfig.PublicAddress,
|
|
|
|
ServiceIP: c.ExtraConfig.APIServerServiceIP,
|
|
ServicePort: c.ExtraConfig.APIServerServicePort,
|
|
ExtraServicePorts: c.ExtraConfig.ExtraServicePorts,
|
|
ExtraEndpointPorts: c.ExtraConfig.ExtraEndpointPorts,
|
|
PublicServicePort: c.GenericConfig.ReadWritePort,
|
|
KubernetesServiceNodePort: c.ExtraConfig.KubernetesServiceNodePort,
|
|
}
|
|
}
|
|
|
|
func (c *Controller) PostStartHook(hookContext genericapiserver.PostStartHookContext) error {
|
|
c.Start()
|
|
return nil
|
|
}
|
|
|
|
func (c *Controller) PreShutdownHook() error {
|
|
c.Stop()
|
|
return nil
|
|
}
|
|
|
|
// Start begins the core controller loops that must exist for bootstrapping
|
|
// a cluster.
|
|
func (c *Controller) Start() {
|
|
if c.runner != nil {
|
|
return
|
|
}
|
|
|
|
repairClusterIPs := servicecontroller.NewRepair(c.ServiceClusterIPInterval, c.ServiceClient, c.EventClient, &c.ServiceClusterIPRange, c.ServiceClusterIPRegistry)
|
|
repairNodePorts := portallocatorcontroller.NewRepair(c.ServiceNodePortInterval, c.ServiceClient, c.EventClient, c.ServiceNodePortRange, c.ServiceNodePortRegistry)
|
|
|
|
// run all of the controllers once prior to returning from Start.
|
|
if err := repairClusterIPs.RunOnce(); err != nil {
|
|
// If we fail to repair cluster IPs apiserver is useless. We should restart and retry.
|
|
glog.Fatalf("Unable to perform initial IP allocation check: %v", err)
|
|
}
|
|
if err := repairNodePorts.RunOnce(); err != nil {
|
|
// If we fail to repair node ports apiserver is useless. We should restart and retry.
|
|
glog.Fatalf("Unable to perform initial service nodePort check: %v", err)
|
|
}
|
|
// Service definition is reconciled during first run to correct port and type per expectations.
|
|
if err := c.UpdateKubernetesService(true); err != nil {
|
|
glog.Errorf("Unable to perform initial Kubernetes service initialization: %v", err)
|
|
}
|
|
|
|
c.runner = async.NewRunner(c.RunKubernetesNamespaces, c.RunKubernetesService, repairClusterIPs.RunUntil, repairNodePorts.RunUntil)
|
|
c.runner.Start()
|
|
}
|
|
|
|
func (c *Controller) Stop() {
|
|
if c.runner != nil {
|
|
c.runner.Stop()
|
|
}
|
|
endpointPorts := createEndpointPortSpec(c.PublicServicePort, "https", c.ExtraEndpointPorts)
|
|
finishedReconciling := make(chan struct{})
|
|
go func() {
|
|
defer close(finishedReconciling)
|
|
glog.Infof("Shutting down kubernetes service endpoint reconciler")
|
|
if err := c.EndpointReconciler.StopReconciling("kubernetes", c.PublicIP, endpointPorts); err != nil {
|
|
glog.Error(err)
|
|
}
|
|
}()
|
|
|
|
select {
|
|
case <-finishedReconciling:
|
|
// done
|
|
case <-time.After(2 * c.EndpointInterval):
|
|
// don't block server shutdown forever if we can't reach etcd to remove ourselves
|
|
glog.Warning("StopReconciling() timed out")
|
|
}
|
|
}
|
|
|
|
// RunKubernetesNamespaces periodically makes sure that all internal namespaces exist
|
|
func (c *Controller) RunKubernetesNamespaces(ch chan struct{}) {
|
|
wait.Until(func() {
|
|
// Loop the system namespace list, and create them if they do not exist
|
|
for _, ns := range c.SystemNamespaces {
|
|
if err := createNamespaceIfNeeded(c.NamespaceClient, ns); err != nil {
|
|
runtime.HandleError(fmt.Errorf("unable to create required kubernetes system namespace %s: %v", ns, err))
|
|
}
|
|
}
|
|
}, c.SystemNamespacesInterval, ch)
|
|
}
|
|
|
|
// RunKubernetesService periodically updates the kubernetes service
|
|
func (c *Controller) RunKubernetesService(ch chan struct{}) {
|
|
wait.Until(func() {
|
|
// Service definition is not reconciled after first
|
|
// run, ports and type will be corrected only during
|
|
// start.
|
|
if err := c.UpdateKubernetesService(false); err != nil {
|
|
runtime.HandleError(fmt.Errorf("unable to sync kubernetes service: %v", err))
|
|
}
|
|
}, c.EndpointInterval, ch)
|
|
}
|
|
|
|
// UpdateKubernetesService attempts to update the default Kube service.
|
|
func (c *Controller) UpdateKubernetesService(reconcile bool) error {
|
|
// Update service & endpoint records.
|
|
// TODO: when it becomes possible to change this stuff,
|
|
// stop polling and start watching.
|
|
// TODO: add endpoints of all replicas, not just the elected master.
|
|
if err := createNamespaceIfNeeded(c.NamespaceClient, metav1.NamespaceDefault); err != nil {
|
|
return err
|
|
}
|
|
|
|
servicePorts, serviceType := createPortAndServiceSpec(c.ServicePort, c.PublicServicePort, c.KubernetesServiceNodePort, "https", c.ExtraServicePorts)
|
|
if err := c.CreateOrUpdateMasterServiceIfNeeded(kubernetesServiceName, c.ServiceIP, servicePorts, serviceType, reconcile); err != nil {
|
|
return err
|
|
}
|
|
endpointPorts := createEndpointPortSpec(c.PublicServicePort, "https", c.ExtraEndpointPorts)
|
|
if err := c.EndpointReconciler.ReconcileEndpoints(kubernetesServiceName, c.PublicIP, endpointPorts, reconcile); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// createPortAndServiceSpec creates an array of service ports.
|
|
// If the NodePort value is 0, just the servicePort is used, otherwise, a node port is exposed.
|
|
func createPortAndServiceSpec(servicePort int, targetServicePort int, nodePort int, servicePortName string, extraServicePorts []api.ServicePort) ([]api.ServicePort, api.ServiceType) {
|
|
//Use the Cluster IP type for the service port if NodePort isn't provided.
|
|
//Otherwise, we will be binding the master service to a NodePort.
|
|
servicePorts := []api.ServicePort{{Protocol: api.ProtocolTCP,
|
|
Port: int32(servicePort),
|
|
Name: servicePortName,
|
|
TargetPort: intstr.FromInt(targetServicePort)}}
|
|
serviceType := api.ServiceTypeClusterIP
|
|
if nodePort > 0 {
|
|
servicePorts[0].NodePort = int32(nodePort)
|
|
serviceType = api.ServiceTypeNodePort
|
|
}
|
|
if extraServicePorts != nil {
|
|
servicePorts = append(servicePorts, extraServicePorts...)
|
|
}
|
|
return servicePorts, serviceType
|
|
}
|
|
|
|
// createEndpointPortSpec creates an array of endpoint ports
|
|
func createEndpointPortSpec(endpointPort int, endpointPortName string, extraEndpointPorts []api.EndpointPort) []api.EndpointPort {
|
|
endpointPorts := []api.EndpointPort{{Protocol: api.ProtocolTCP,
|
|
Port: int32(endpointPort),
|
|
Name: endpointPortName,
|
|
}}
|
|
if extraEndpointPorts != nil {
|
|
endpointPorts = append(endpointPorts, extraEndpointPorts...)
|
|
}
|
|
return endpointPorts
|
|
}
|
|
|
|
// CreateMasterServiceIfNeeded will create the specified service if it
|
|
// doesn't already exist.
|
|
func (c *Controller) CreateOrUpdateMasterServiceIfNeeded(serviceName string, serviceIP net.IP, servicePorts []api.ServicePort, serviceType api.ServiceType, reconcile bool) error {
|
|
if s, err := c.ServiceClient.Services(metav1.NamespaceDefault).Get(serviceName, metav1.GetOptions{}); err == nil {
|
|
// The service already exists.
|
|
if reconcile {
|
|
if svc, updated := reconcilers.GetMasterServiceUpdateIfNeeded(s, servicePorts, serviceType); updated {
|
|
glog.Warningf("Resetting master service %q to %#v", serviceName, svc)
|
|
_, err := c.ServiceClient.Services(metav1.NamespaceDefault).Update(svc)
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
svc := &api.Service{
|
|
ObjectMeta: metav1.ObjectMeta{
|
|
Name: serviceName,
|
|
Namespace: metav1.NamespaceDefault,
|
|
Labels: map[string]string{"provider": "kubernetes", "component": "apiserver"},
|
|
},
|
|
Spec: api.ServiceSpec{
|
|
Ports: servicePorts,
|
|
// maintained by this code, not by the pod selector
|
|
Selector: nil,
|
|
ClusterIP: serviceIP.String(),
|
|
SessionAffinity: api.ServiceAffinityNone,
|
|
Type: serviceType,
|
|
},
|
|
}
|
|
|
|
_, err := c.ServiceClient.Services(metav1.NamespaceDefault).Create(svc)
|
|
if errors.IsAlreadyExists(err) {
|
|
return c.CreateOrUpdateMasterServiceIfNeeded(serviceName, serviceIP, servicePorts, serviceType, reconcile)
|
|
}
|
|
return err
|
|
}
|