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main.go
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main.go
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// Copyright 2018-2019 Authors of Cilium
//
// 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 main
import (
"flag"
"fmt"
"os"
"os/signal"
"syscall"
"time"
"github.com/cilium/cilium/pkg/defaults"
"github.com/cilium/cilium/pkg/k8s"
clientset "github.com/cilium/cilium/pkg/k8s/client/clientset/versioned"
k8sversion "github.com/cilium/cilium/pkg/k8s/version"
"github.com/cilium/cilium/pkg/kvstore"
"github.com/cilium/cilium/pkg/logging"
"github.com/cilium/cilium/pkg/logging/logfields"
"github.com/cilium/cilium/pkg/option"
"github.com/cilium/cilium/pkg/version"
gops "github.com/google/gops/agent"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"github.com/spf13/viper"
"k8s.io/klog"
)
var (
log = logging.DefaultLogger.WithField(logfields.LogSubsys, "cilium-operator")
rootCmd = &cobra.Command{
Use: "cilium-operator",
Short: "Run the cilium-operator",
Run: func(cmd *cobra.Command, args []string) {
runOperator(cmd)
},
}
k8sAPIServer string
k8sKubeConfigPath string
kvStore string
kvStoreOpts = make(map[string]string)
apiServerPort uint16
shutdownSignal = make(chan struct{})
synchronizeServices bool
enableCepGC bool
ciliumK8sClient clientset.Interface
)
func main() {
signals := make(chan os.Signal, 1)
signal.Notify(signals, syscall.SIGINT, syscall.SIGTERM)
go func() {
<-signals
close(shutdownSignal)
}()
// Open socket for using gops to get stacktraces of the agent.
if err := gops.Listen(gops.Options{}); err != nil {
errorString := fmt.Sprintf("unable to start gops: %s", err)
fmt.Println(errorString)
os.Exit(-1)
}
if err := rootCmd.Execute(); err != nil {
fmt.Println(err)
os.Exit(-1)
}
}
func init() {
cobra.OnInitialize(initConfig)
flags := rootCmd.Flags()
flags.Bool("version", false, "Print version information")
flags.Int(option.ClusterIDName, 0, "Unique identifier of the cluster")
option.BindEnv(option.ClusterIDName)
flags.String(option.ClusterName, defaults.ClusterName, "Name of the cluster")
option.BindEnv(option.ClusterName)
flags.BoolP("debug", "D", false, "Enable debugging mode")
flags.StringVar(&k8sAPIServer, "k8s-api-server", "", "Kubernetes api address server (for https use --k8s-kubeconfig-path instead)")
flags.StringVar(&k8sKubeConfigPath, "k8s-kubeconfig-path", "", "Absolute path of the kubernetes kubeconfig file")
flags.StringVar(&kvStore, "kvstore", "", "Key-value store type")
flags.Var(option.NewNamedMapOptions("kvstore-opts", &kvStoreOpts, nil), "kvstore-opt", "Key-value store options")
flags.Uint16Var(&apiServerPort, "api-server-port", 9234, "Port on which the operator should serve API requests")
flags.BoolVar(&synchronizeServices, "synchronize-k8s-services", true, "Synchronize Kubernetes services to kvstore")
flags.BoolVar(&enableCepGC, "cilium-endpoint-gc", true, "Enable CiliumEndpoint garbage collector")
flags.DurationVar(&identityGCInterval, "identity-gc-interval", time.Minute*10, "GC interval for security identities")
flags.DurationVar(&kvNodeGCInterval, "nodes-gc-interval", time.Minute*2, "GC interval for nodes store in the kvstore")
flags.IntVar(&unmanagedKubeDnsWatcherInterval, "unmanaged-pod-watcher-interval", 15, "Interval to check for unmanaged kube-dns pods (0 to disable)")
// We need to obtain from Cilium ConfigMap if the CiliumEndpointCRD option
// is enabled or disabled. This option is marked as hidden because the
// Cilium Endpoint CRD controller is not in this program and by having it
// being printed by operator --help could confuse users.
flags.Bool(option.DisableCiliumEndpointCRDName, false, "")
flags.MarkHidden(option.DisableCiliumEndpointCRDName)
option.BindEnv(option.DisableCiliumEndpointCRDName)
viper.BindPFlags(flags)
// Make sure that klog logging variables are initialized so that we can
// update them from this file.
klog.InitFlags(nil)
// Make sure klog (used by the client-go dependency) logs to stderr, as it
// will try to log to directories that may not exist in the cilium-operator
// container (/tmp) and cause the cilium-operator to exit.
flag.Set("logtostderr", "true")
}
// initConfig reads in config file and ENV variables if set.
func initConfig() {
if viper.GetBool("version") {
fmt.Printf("Cilium %s\n", version.Version)
os.Exit(0)
}
option.Config.ClusterName = viper.GetString(option.ClusterName)
option.Config.ClusterID = viper.GetInt(option.ClusterIDName)
option.Config.DisableCiliumEndpointCRD = viper.GetBool(option.DisableCiliumEndpointCRDName)
viper.SetEnvPrefix("cilium")
viper.SetConfigName("cilium-operator")
}
func runOperator(cmd *cobra.Command) {
logging.SetupLogging([]string{}, map[string]string{}, "cilium-operator", viper.GetBool("debug"))
log.Infof("Cilium Operator %s", version.Version)
go startServer(fmt.Sprintf(":%d", apiServerPort), shutdownSignal)
if err := kvstore.Setup(kvStore, kvStoreOpts, nil); err != nil {
log.WithError(err).WithFields(logrus.Fields{
"kvstore": kvStore,
"address": kvStoreOpts[fmt.Sprintf("%s.address", kvStore)],
}).Fatal("Unable to setup kvstore")
}
k8s.Configure(k8sAPIServer, k8sKubeConfigPath)
if err := k8s.Init(); err != nil {
log.WithError(err).Fatal("Unable to connect to Kubernetes apiserver")
}
ciliumK8sClient = k8s.CiliumClient()
k8sversion.Update(k8s.Client())
if !k8sversion.Capabilities().MinimalVersionMet {
log.Fatalf("Minimal kubernetes version not met: %s < %s",
k8sversion.Version(), k8sversion.MinimalVersionConstraint)
}
// Restart kube-dns as soon as possible since it helps etcd-operator to be
// properly setup. If kube-dns is not managed by Cilium it can prevent
// etcd from reaching out kube-dns in EKS.
if option.Config.DisableCiliumEndpointCRD {
log.Infof("KubeDNS unmanaged pods controller disabled as %q option is set to 'disabled' in Cilium ConfigMap", option.DisableCiliumEndpointCRDName)
} else {
enableUnmanagedKubeDNSController()
}
if synchronizeServices {
startSynchronizingServices()
}
if enableCepGC {
enableCiliumEndpointSyncGC()
}
if err := runNodeWatcher(); err != nil {
log.WithError(err).Error("Unable to setup node watcher")
}
if identityGCInterval != time.Duration(0) {
startIdentityGC()
}
err := enableCNPWatcher()
if err != nil {
log.WithError(err).WithField("subsys", "CNPWatcher").Fatal(
"Cannot connect to Kubernetes apiserver ")
}
for {
select {
case <-shutdownSignal:
// graceful exit
log.Info("Received termination signal. Shutting down")
return
case <-time.After(time.Second):
}
}
}