343 lines
14 KiB
Go
343 lines
14 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 app does all of the work necessary to create a Kubernetes
|
||
|
|
// APIServer by binding together the API, master and APIServer infrastructure.
|
||
|
|
// It can be configured and called directly or via the hyperkube framework.
|
||
|
|
package app
|
||
|
|
|
||
|
|
import (
|
||
|
|
"crypto/tls"
|
||
|
|
"fmt"
|
||
|
|
"net"
|
||
|
|
"net/http"
|
||
|
|
"net/url"
|
||
|
|
"os"
|
||
|
|
"strconv"
|
||
|
|
"strings"
|
||
|
|
"time"
|
||
|
|
|
||
|
|
"github.com/golang/glog"
|
||
|
|
"github.com/pborman/uuid"
|
||
|
|
"github.com/spf13/cobra"
|
||
|
|
"github.com/spf13/pflag"
|
||
|
|
|
||
|
|
"k8s.io/apimachinery/pkg/runtime/schema"
|
||
|
|
utilerrors "k8s.io/apimachinery/pkg/util/errors"
|
||
|
|
utilnet "k8s.io/apimachinery/pkg/util/net"
|
||
|
|
"k8s.io/apimachinery/pkg/util/sets"
|
||
|
|
"k8s.io/apimachinery/pkg/util/wait"
|
||
|
|
"k8s.io/kubernetes/cmd/kube-apiserver/app/options"
|
||
|
|
"k8s.io/kubernetes/pkg/admission"
|
||
|
|
"k8s.io/kubernetes/pkg/api"
|
||
|
|
"k8s.io/kubernetes/pkg/apis/autoscaling"
|
||
|
|
"k8s.io/kubernetes/pkg/apis/batch"
|
||
|
|
"k8s.io/kubernetes/pkg/apis/extensions"
|
||
|
|
"k8s.io/kubernetes/pkg/capabilities"
|
||
|
|
"k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
|
||
|
|
"k8s.io/kubernetes/pkg/cloudprovider"
|
||
|
|
"k8s.io/kubernetes/pkg/controller/informers"
|
||
|
|
serviceaccountcontroller "k8s.io/kubernetes/pkg/controller/serviceaccount"
|
||
|
|
generatedopenapi "k8s.io/kubernetes/pkg/generated/openapi"
|
||
|
|
"k8s.io/kubernetes/pkg/genericapiserver"
|
||
|
|
"k8s.io/kubernetes/pkg/genericapiserver/filters"
|
||
|
|
"k8s.io/kubernetes/pkg/kubeapiserver"
|
||
|
|
kubeadmission "k8s.io/kubernetes/pkg/kubeapiserver/admission"
|
||
|
|
kubeauthenticator "k8s.io/kubernetes/pkg/kubeapiserver/authenticator"
|
||
|
|
"k8s.io/kubernetes/pkg/master"
|
||
|
|
"k8s.io/kubernetes/pkg/master/tunneler"
|
||
|
|
"k8s.io/kubernetes/pkg/registry/cachesize"
|
||
|
|
"k8s.io/kubernetes/pkg/version"
|
||
|
|
)
|
||
|
|
|
||
|
|
// NewAPIServerCommand creates a *cobra.Command object with default parameters
|
||
|
|
func NewAPIServerCommand() *cobra.Command {
|
||
|
|
s := options.NewServerRunOptions()
|
||
|
|
s.AddFlags(pflag.CommandLine)
|
||
|
|
cmd := &cobra.Command{
|
||
|
|
Use: "kube-apiserver",
|
||
|
|
Long: `The Kubernetes API server validates and configures data
|
||
|
|
for the api objects which include pods, services, replicationcontrollers, and
|
||
|
|
others. The API Server services REST operations and provides the frontend to the
|
||
|
|
cluster's shared state through which all other components interact.`,
|
||
|
|
Run: func(cmd *cobra.Command, args []string) {
|
||
|
|
},
|
||
|
|
}
|
||
|
|
|
||
|
|
return cmd
|
||
|
|
}
|
||
|
|
|
||
|
|
// Run runs the specified APIServer. This should never exit.
|
||
|
|
func Run(s *options.ServerRunOptions) error {
|
||
|
|
// set defaults
|
||
|
|
if err := s.GenericServerRunOptions.DefaultAdvertiseAddress(s.SecureServing, s.InsecureServing); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
serviceIPRange, apiServerServiceIP, err := master.DefaultServiceIPRange(s.ServiceClusterIPRange)
|
||
|
|
if err != nil {
|
||
|
|
return fmt.Errorf("error determining service IP ranges: %v", err)
|
||
|
|
}
|
||
|
|
if err := s.SecureServing.MaybeDefaultWithSelfSignedCerts(s.GenericServerRunOptions.AdvertiseAddress.String(), apiServerServiceIP); err != nil {
|
||
|
|
return fmt.Errorf("error creating self-signed certificates: %v", err)
|
||
|
|
}
|
||
|
|
if err := s.CloudProvider.DefaultExternalHost(s.GenericServerRunOptions); err != nil {
|
||
|
|
return fmt.Errorf("error setting the external host value: %v", err)
|
||
|
|
}
|
||
|
|
|
||
|
|
// validate options
|
||
|
|
if errs := s.Validate(); len(errs) != 0 {
|
||
|
|
return utilerrors.NewAggregate(errs)
|
||
|
|
}
|
||
|
|
|
||
|
|
// create config from options
|
||
|
|
genericConfig := genericapiserver.NewConfig().
|
||
|
|
ApplyOptions(s.GenericServerRunOptions).
|
||
|
|
ApplyInsecureServingOptions(s.InsecureServing)
|
||
|
|
|
||
|
|
if _, err := genericConfig.ApplySecureServingOptions(s.SecureServing); err != nil {
|
||
|
|
return fmt.Errorf("failed to configure https: %s", err)
|
||
|
|
}
|
||
|
|
if err = s.Authentication.Apply(genericConfig); err != nil {
|
||
|
|
return fmt.Errorf("failed to configure authentication: %s", err)
|
||
|
|
}
|
||
|
|
|
||
|
|
capabilities.Initialize(capabilities.Capabilities{
|
||
|
|
AllowPrivileged: s.AllowPrivileged,
|
||
|
|
// TODO(vmarmol): Implement support for HostNetworkSources.
|
||
|
|
PrivilegedSources: capabilities.PrivilegedSources{
|
||
|
|
HostNetworkSources: []string{},
|
||
|
|
HostPIDSources: []string{},
|
||
|
|
HostIPCSources: []string{},
|
||
|
|
},
|
||
|
|
PerConnectionBandwidthLimitBytesPerSec: s.MaxConnectionBytesPerSec,
|
||
|
|
})
|
||
|
|
|
||
|
|
// Setup nodeTunneler if needed
|
||
|
|
var nodeTunneler tunneler.Tunneler
|
||
|
|
var proxyDialerFn utilnet.DialFunc
|
||
|
|
if len(s.SSHUser) > 0 {
|
||
|
|
// Get ssh key distribution func, if supported
|
||
|
|
var installSSHKey tunneler.InstallSSHKey
|
||
|
|
cloud, err := cloudprovider.InitCloudProvider(s.CloudProvider.CloudProvider, s.CloudProvider.CloudConfigFile)
|
||
|
|
if err != nil {
|
||
|
|
return fmt.Errorf("cloud provider could not be initialized: %v", err)
|
||
|
|
}
|
||
|
|
if cloud != nil {
|
||
|
|
if instances, supported := cloud.Instances(); supported {
|
||
|
|
installSSHKey = instances.AddSSHKeyToAllInstances
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if s.KubeletConfig.Port == 0 {
|
||
|
|
return fmt.Errorf("must enable kubelet port if proxy ssh-tunneling is specified")
|
||
|
|
}
|
||
|
|
if s.KubeletConfig.ReadOnlyPort == 0 {
|
||
|
|
return fmt.Errorf("must enable kubelet readonly port if proxy ssh-tunneling is specified")
|
||
|
|
}
|
||
|
|
// Set up the nodeTunneler
|
||
|
|
// TODO(cjcullen): If we want this to handle per-kubelet ports or other
|
||
|
|
// kubelet listen-addresses, we need to plumb through options.
|
||
|
|
healthCheckPath := &url.URL{
|
||
|
|
Scheme: "http",
|
||
|
|
Host: net.JoinHostPort("127.0.0.1", strconv.FormatUint(uint64(s.KubeletConfig.ReadOnlyPort), 10)),
|
||
|
|
Path: "healthz",
|
||
|
|
}
|
||
|
|
nodeTunneler = tunneler.New(s.SSHUser, s.SSHKeyfile, healthCheckPath, installSSHKey)
|
||
|
|
|
||
|
|
// Use the nodeTunneler's dialer to connect to the kubelet
|
||
|
|
s.KubeletConfig.Dial = nodeTunneler.Dial
|
||
|
|
// Use the nodeTunneler's dialer when proxying to pods, services, and nodes
|
||
|
|
proxyDialerFn = nodeTunneler.Dial
|
||
|
|
}
|
||
|
|
|
||
|
|
// Proxying to pods and services is IP-based... don't expect to be able to verify the hostname
|
||
|
|
proxyTLSClientConfig := &tls.Config{InsecureSkipVerify: true}
|
||
|
|
|
||
|
|
if s.Etcd.StorageConfig.DeserializationCacheSize == 0 {
|
||
|
|
// When size of cache is not explicitly set, estimate its size based on
|
||
|
|
// target memory usage.
|
||
|
|
glog.V(2).Infof("Initializing deserialization cache size based on %dMB limit", s.GenericServerRunOptions.TargetRAMMB)
|
||
|
|
|
||
|
|
// This is the heuristics that from memory capacity is trying to infer
|
||
|
|
// the maximum number of nodes in the cluster and set cache sizes based
|
||
|
|
// on that value.
|
||
|
|
// From our documentation, we officially recomment 120GB machines for
|
||
|
|
// 2000 nodes, and we scale from that point. Thus we assume ~60MB of
|
||
|
|
// capacity per node.
|
||
|
|
// TODO: We may consider deciding that some percentage of memory will
|
||
|
|
// be used for the deserialization cache and divide it by the max object
|
||
|
|
// size to compute its size. We may even go further and measure
|
||
|
|
// collective sizes of the objects in the cache.
|
||
|
|
clusterSize := s.GenericServerRunOptions.TargetRAMMB / 60
|
||
|
|
s.Etcd.StorageConfig.DeserializationCacheSize = 25 * clusterSize
|
||
|
|
if s.Etcd.StorageConfig.DeserializationCacheSize < 1000 {
|
||
|
|
s.Etcd.StorageConfig.DeserializationCacheSize = 1000
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
storageGroupsToEncodingVersion, err := s.GenericServerRunOptions.StorageGroupsToEncodingVersion()
|
||
|
|
if err != nil {
|
||
|
|
return fmt.Errorf("error generating storage version map: %s", err)
|
||
|
|
}
|
||
|
|
storageFactory, err := kubeapiserver.BuildDefaultStorageFactory(
|
||
|
|
s.Etcd.StorageConfig, s.GenericServerRunOptions.DefaultStorageMediaType, api.Codecs,
|
||
|
|
genericapiserver.NewDefaultResourceEncodingConfig(), storageGroupsToEncodingVersion,
|
||
|
|
// FIXME: this GroupVersionResource override should be configurable
|
||
|
|
[]schema.GroupVersionResource{batch.Resource("cronjobs").WithVersion("v2alpha1")},
|
||
|
|
master.DefaultAPIResourceConfigSource(), s.GenericServerRunOptions.RuntimeConfig)
|
||
|
|
if err != nil {
|
||
|
|
return fmt.Errorf("error in initializing storage factory: %s", err)
|
||
|
|
}
|
||
|
|
storageFactory.AddCohabitatingResources(autoscaling.Resource("horizontalpodautoscalers"), extensions.Resource("horizontalpodautoscalers"))
|
||
|
|
for _, override := range s.Etcd.EtcdServersOverrides {
|
||
|
|
tokens := strings.Split(override, "#")
|
||
|
|
if len(tokens) != 2 {
|
||
|
|
glog.Errorf("invalid value of etcd server overrides: %s", override)
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
apiresource := strings.Split(tokens[0], "/")
|
||
|
|
if len(apiresource) != 2 {
|
||
|
|
glog.Errorf("invalid resource definition: %s", tokens[0])
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
group := apiresource[0]
|
||
|
|
resource := apiresource[1]
|
||
|
|
groupResource := schema.GroupResource{Group: group, Resource: resource}
|
||
|
|
|
||
|
|
servers := strings.Split(tokens[1], ";")
|
||
|
|
storageFactory.SetEtcdLocation(groupResource, servers)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Default to the private server key for service account token signing
|
||
|
|
if len(s.Authentication.ServiceAccounts.KeyFiles) == 0 && s.SecureServing.ServerCert.CertKey.KeyFile != "" {
|
||
|
|
if kubeauthenticator.IsValidServiceAccountKeyFile(s.SecureServing.ServerCert.CertKey.KeyFile) {
|
||
|
|
s.Authentication.ServiceAccounts.KeyFiles = []string{s.SecureServing.ServerCert.CertKey.KeyFile}
|
||
|
|
} else {
|
||
|
|
glog.Warning("No TLS key provided, service account token authentication disabled")
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
authenticatorConfig := s.Authentication.ToAuthenticationConfig()
|
||
|
|
if s.Authentication.ServiceAccounts.Lookup {
|
||
|
|
// If we need to look up service accounts and tokens,
|
||
|
|
// go directly to etcd to avoid recursive auth insanity
|
||
|
|
storageConfig, err := storageFactory.NewConfig(api.Resource("serviceaccounts"))
|
||
|
|
if err != nil {
|
||
|
|
return fmt.Errorf("unable to get serviceaccounts storage: %v", err)
|
||
|
|
}
|
||
|
|
authenticatorConfig.ServiceAccountTokenGetter = serviceaccountcontroller.NewGetterFromStorageInterface(storageConfig, storageFactory.ResourcePrefix(api.Resource("serviceaccounts")), storageFactory.ResourcePrefix(api.Resource("secrets")))
|
||
|
|
}
|
||
|
|
|
||
|
|
apiAuthenticator, securityDefinitions, err := authenticatorConfig.New()
|
||
|
|
if err != nil {
|
||
|
|
return fmt.Errorf("invalid Authentication Config: %v", err)
|
||
|
|
}
|
||
|
|
|
||
|
|
privilegedLoopbackToken := uuid.NewRandom().String()
|
||
|
|
selfClientConfig, err := genericapiserver.NewSelfClientConfig(genericConfig.SecureServingInfo, genericConfig.InsecureServingInfo, privilegedLoopbackToken)
|
||
|
|
if err != nil {
|
||
|
|
return fmt.Errorf("failed to create clientset: %v", err)
|
||
|
|
}
|
||
|
|
client, err := internalclientset.NewForConfig(selfClientConfig)
|
||
|
|
if err != nil {
|
||
|
|
kubeAPIVersions := os.Getenv("KUBE_API_VERSIONS")
|
||
|
|
if len(kubeAPIVersions) == 0 {
|
||
|
|
return fmt.Errorf("failed to create clientset: %v", err)
|
||
|
|
}
|
||
|
|
|
||
|
|
// KUBE_API_VERSIONS is used in test-update-storage-objects.sh, disabling a number of API
|
||
|
|
// groups. This leads to a nil client above and undefined behaviour further down.
|
||
|
|
// TODO: get rid of KUBE_API_VERSIONS or define sane behaviour if set
|
||
|
|
glog.Errorf("Failed to create clientset with KUBE_API_VERSIONS=%q. KUBE_API_VERSIONS is only for testing. Things will break.", kubeAPIVersions)
|
||
|
|
}
|
||
|
|
sharedInformers := informers.NewSharedInformerFactory(nil, client, 10*time.Minute)
|
||
|
|
|
||
|
|
authorizationConfig := s.Authorization.ToAuthorizationConfig(sharedInformers)
|
||
|
|
apiAuthorizer, err := authorizationConfig.New()
|
||
|
|
if err != nil {
|
||
|
|
return fmt.Errorf("invalid Authorization Config: %v", err)
|
||
|
|
}
|
||
|
|
|
||
|
|
admissionControlPluginNames := strings.Split(s.GenericServerRunOptions.AdmissionControl, ",")
|
||
|
|
pluginInitializer := kubeadmission.NewPluginInitializer(client, sharedInformers, apiAuthorizer)
|
||
|
|
admissionController, err := admission.NewFromPlugins(admissionControlPluginNames, s.GenericServerRunOptions.AdmissionControlConfigFile, pluginInitializer)
|
||
|
|
if err != nil {
|
||
|
|
return fmt.Errorf("failed to initialize plugins: %v", err)
|
||
|
|
}
|
||
|
|
|
||
|
|
proxyTransport := utilnet.SetTransportDefaults(&http.Transport{
|
||
|
|
Dial: proxyDialerFn,
|
||
|
|
TLSClientConfig: proxyTLSClientConfig,
|
||
|
|
})
|
||
|
|
kubeVersion := version.Get()
|
||
|
|
|
||
|
|
genericConfig.Version = &kubeVersion
|
||
|
|
genericConfig.LoopbackClientConfig = selfClientConfig
|
||
|
|
genericConfig.Authenticator = apiAuthenticator
|
||
|
|
genericConfig.Authorizer = apiAuthorizer
|
||
|
|
genericConfig.AdmissionControl = admissionController
|
||
|
|
genericConfig.OpenAPIConfig = genericapiserver.DefaultOpenAPIConfig(generatedopenapi.OpenAPIDefinitions)
|
||
|
|
genericConfig.OpenAPIConfig.SecurityDefinitions = securityDefinitions
|
||
|
|
genericConfig.OpenAPIConfig.Info.Title = "Kubernetes"
|
||
|
|
genericConfig.SwaggerConfig = genericapiserver.DefaultSwaggerConfig()
|
||
|
|
genericConfig.EnableMetrics = true
|
||
|
|
genericConfig.LongRunningFunc = filters.BasicLongRunningRequestCheck(
|
||
|
|
sets.NewString("watch", "proxy"),
|
||
|
|
sets.NewString("attach", "exec", "proxy", "log", "portforward"),
|
||
|
|
)
|
||
|
|
|
||
|
|
config := &master.Config{
|
||
|
|
GenericConfig: genericConfig,
|
||
|
|
|
||
|
|
APIResourceConfigSource: storageFactory.APIResourceConfigSource,
|
||
|
|
StorageFactory: storageFactory,
|
||
|
|
EnableWatchCache: s.GenericServerRunOptions.EnableWatchCache,
|
||
|
|
EnableCoreControllers: true,
|
||
|
|
DeleteCollectionWorkers: s.GenericServerRunOptions.DeleteCollectionWorkers,
|
||
|
|
EventTTL: s.EventTTL,
|
||
|
|
KubeletClientConfig: s.KubeletConfig,
|
||
|
|
EnableUISupport: true,
|
||
|
|
EnableLogsSupport: true,
|
||
|
|
ProxyTransport: proxyTransport,
|
||
|
|
|
||
|
|
Tunneler: nodeTunneler,
|
||
|
|
|
||
|
|
ServiceIPRange: serviceIPRange,
|
||
|
|
APIServerServiceIP: apiServerServiceIP,
|
||
|
|
APIServerServicePort: 443,
|
||
|
|
|
||
|
|
ServiceNodePortRange: s.ServiceNodePortRange,
|
||
|
|
KubernetesServiceNodePort: s.KubernetesServiceNodePort,
|
||
|
|
|
||
|
|
MasterCount: s.MasterCount,
|
||
|
|
}
|
||
|
|
|
||
|
|
if s.GenericServerRunOptions.EnableWatchCache {
|
||
|
|
glog.V(2).Infof("Initializing cache sizes based on %dMB limit", s.GenericServerRunOptions.TargetRAMMB)
|
||
|
|
cachesize.InitializeWatchCacheSizes(s.GenericServerRunOptions.TargetRAMMB)
|
||
|
|
cachesize.SetWatchCacheSizes(s.GenericServerRunOptions.WatchCacheSizes)
|
||
|
|
}
|
||
|
|
|
||
|
|
m, err := config.Complete().New()
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
sharedInformers.Start(wait.NeverStop)
|
||
|
|
m.GenericAPIServer.PrepareRun().Run(wait.NeverStop)
|
||
|
|
return nil
|
||
|
|
}
|