forked from projectcalico/kube-controllers
/
main.go
210 lines (180 loc) · 6.73 KB
/
main.go
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// Copyright (c) 2017 Tigera, Inc. All rights reserved.
//
// 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 (
"context"
"flag"
"fmt"
"os"
"strings"
"time"
"github.com/coreos/etcd/clientv3"
"github.com/coreos/etcd/pkg/transport"
"github.com/projectcalico/kube-controllers/pkg/config"
"github.com/projectcalico/kube-controllers/pkg/controllers/namespace"
"github.com/projectcalico/kube-controllers/pkg/controllers/networkpolicy"
"github.com/projectcalico/kube-controllers/pkg/controllers/node"
"github.com/projectcalico/kube-controllers/pkg/controllers/pod"
"github.com/projectcalico/libcalico-go/lib/apiconfig"
client "github.com/projectcalico/libcalico-go/lib/clientv3"
"github.com/projectcalico/libcalico-go/lib/logutils"
log "github.com/sirupsen/logrus"
"k8s.io/apiserver/pkg/storage/etcd3"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
)
// VERSION is filled out during the build process (using git describe output)
var VERSION string
func main() {
// Configure log formatting.
log.SetFormatter(&logutils.Formatter{})
// Install a hook that adds file/line no information.
log.AddHook(&logutils.ContextHook{})
// If `-v` is passed, display the version and exit.
// Use a new flag set so as not to conflict with existing libraries which use "flag"
flagSet := flag.NewFlagSet("Calico", flag.ExitOnError)
version := flagSet.Bool("v", false, "Display version")
err := flagSet.Parse(os.Args[1:])
if err != nil {
log.WithError(err).Fatal("Failed to parse flags")
}
if *version {
fmt.Println(VERSION)
os.Exit(0)
}
// Attempt to load configuration.
config := new(config.Config)
if err = config.Parse(); err != nil {
log.WithError(err).Fatal("Failed to parse config")
}
log.WithField("config", config).Info("Loaded configuration from environment")
// Set the log level based on the loaded configuration.
logLevel, err := log.ParseLevel(config.LogLevel)
if err != nil {
logLevel = log.InfoLevel
}
log.SetLevel(logLevel)
// Build clients to be used by the controllers.
k8sClientset, calicoClient, err := getClients(config.Kubeconfig)
if err != nil {
log.WithError(err).Fatal("Failed to start")
}
stop := make(chan struct{})
defer close(stop)
// Create the context.
ctx := context.Background()
log.Info("Ensuring Calico datastore is initialized")
initCtx, cancelInit := context.WithTimeout(ctx, 10*time.Second)
defer cancelInit()
err = calicoClient.EnsureInitialized(initCtx, "", "k8s")
if err != nil {
log.WithError(err).Fatal("Failed to initialize Calico datastore")
}
for _, controllerType := range strings.Split(config.EnabledControllers, ",") {
switch controllerType {
case "workloadendpoint":
podController := pod.NewPodController(ctx, k8sClientset, calicoClient)
go podController.Run(config.WorkloadEndpointWorkers, config.ReconcilerPeriod, stop)
case "profile":
namespaceController := namespace.NewNamespaceController(ctx, k8sClientset, calicoClient)
go namespaceController.Run(config.ProfileWorkers, config.ReconcilerPeriod, stop)
case "policy":
policyController := networkpolicy.NewPolicyController(ctx, k8sClientset, calicoClient)
go policyController.Run(config.PolicyWorkers, config.ReconcilerPeriod, stop)
case "node":
nodeController := node.NewNodeController(ctx, k8sClientset, calicoClient)
go nodeController.Run(config.NodeWorkers, config.ReconcilerPeriod, stop)
default:
log.Fatalf("Invalid controller '%s' provided. Valid options are workloadendpoint, profile, policy", controllerType)
}
}
// If configured to do so, start an etcdv3 compaction.
startCompactor(ctx, config)
// Wait forever.
select {}
}
// Starts an etcdv3 compaction goroutine with the given config.
func startCompactor(ctx context.Context, config *config.Config) {
interval, err := time.ParseDuration(config.CompactionPeriod)
if err != nil {
log.WithError(err).Fatal("Invalid compact interval")
}
if interval.Nanoseconds() == 0 {
log.Info("Disabling periodic etcdv3 compaction")
return
}
// Kick off a periodic compaction of etcd.
etcdClient, err := newEtcdV3Client()
if err != nil {
log.WithError(err).Error("Failed to start etcd compaction routine")
} else {
log.WithField("period", interval).Info("Starting periodic etcdv3 compaction")
etcd3.StartCompactor(ctx, etcdClient, interval)
}
}
// getClients builds and returns Kubernetes and Calico clients.
func getClients(kubeconfig string) (*kubernetes.Clientset, client.Interface, error) {
// Get Calico client
calicoClient, err := client.NewFromEnv()
if err != nil {
return nil, nil, fmt.Errorf("failed to build Calico client: %s", err)
}
// Now build the Kubernetes client, we support in-cluster config and kubeconfig
// as means of configuring the client.
k8sconfig, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
if err != nil {
return nil, nil, fmt.Errorf("failed to build kubernetes client config: %s", err)
}
// Get Kubernetes clientset
k8sClientset, err := kubernetes.NewForConfig(k8sconfig)
if err != nil {
return nil, nil, fmt.Errorf("failed to build kubernetes client: %s", err)
}
return k8sClientset, calicoClient, nil
}
// Returns an etcdv3 client based on the environment. The client will be configured to
// match that in use by the libcalico-go client.
func newEtcdV3Client() (*clientv3.Client, error) {
config, err := apiconfig.LoadClientConfigFromEnvironment()
if err != nil {
return nil, err
}
// Split the endpoints into a location slice.
etcdLocation := []string{}
if config.Spec.EtcdEndpoints != "" {
etcdLocation = strings.Split(config.Spec.EtcdEndpoints, ",")
}
if len(etcdLocation) == 0 {
log.Warning("No etcd endpoints specified in etcdv3 API config")
return nil, fmt.Errorf("no etcd endpoints specified")
}
// Create the etcd client
tlsInfo := &transport.TLSInfo{
CAFile: config.Spec.EtcdCACertFile,
CertFile: config.Spec.EtcdCertFile,
KeyFile: config.Spec.EtcdKeyFile,
}
tls, _ := tlsInfo.ClientConfig()
cfg := clientv3.Config{
Endpoints: etcdLocation,
TLS: tls,
DialTimeout: 10 * time.Second,
}
// Plumb through the username and password if both are configured.
if config.Spec.EtcdUsername != "" && config.Spec.EtcdPassword != "" {
cfg.Username = config.Spec.EtcdUsername
cfg.Password = config.Spec.EtcdPassword
}
return clientv3.New(cfg)
}