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main.go
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main.go
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// Copyright The OpenTelemetry 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 main
import (
"context"
"flag"
"fmt"
"os"
"runtime"
"strings"
"time"
"github.com/spf13/pflag"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
k8sruntime "k8s.io/apimachinery/pkg/runtime"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
clientgoscheme "k8s.io/client-go/kubernetes/scheme"
_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
"k8s.io/client-go/tools/record"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/cache"
"sigs.k8s.io/controller-runtime/pkg/healthz"
"sigs.k8s.io/controller-runtime/pkg/log/zap"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/webhook"
otelv1alpha1 "github.com/open-telemetry/opentelemetry-operator/apis/v1alpha1"
"github.com/open-telemetry/opentelemetry-operator/controllers"
"github.com/open-telemetry/opentelemetry-operator/internal/config"
"github.com/open-telemetry/opentelemetry-operator/internal/version"
"github.com/open-telemetry/opentelemetry-operator/internal/webhookhandler"
"github.com/open-telemetry/opentelemetry-operator/pkg/autodetect"
collectorupgrade "github.com/open-telemetry/opentelemetry-operator/pkg/collector/upgrade"
"github.com/open-telemetry/opentelemetry-operator/pkg/instrumentation"
instrumentationupgrade "github.com/open-telemetry/opentelemetry-operator/pkg/instrumentation/upgrade"
"github.com/open-telemetry/opentelemetry-operator/pkg/sidecar"
// +kubebuilder:scaffold:imports
)
var (
scheme = k8sruntime.NewScheme()
setupLog = ctrl.Log.WithName("setup")
)
func init() {
utilruntime.Must(clientgoscheme.AddToScheme(scheme))
utilruntime.Must(otelv1alpha1.AddToScheme(scheme))
// +kubebuilder:scaffold:scheme
}
func main() {
// registers any flags that underlying libraries might use
opts := zap.Options{}
opts.BindFlags(flag.CommandLine)
pflag.CommandLine.AddGoFlagSet(flag.CommandLine)
v := version.Get()
// add flags related to this operator
var (
metricsAddr string
probeAddr string
enableLeaderElection bool
collectorImage string
targetAllocatorImage string
autoInstrumentationJava string
autoInstrumentationNodeJS string
autoInstrumentationPython string
labelsFilter []string
)
pflag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.")
flag.StringVar(&probeAddr, "health-probe-addr", ":8081", "The address the probe endpoint binds to.")
pflag.BoolVar(&enableLeaderElection, "enable-leader-election", false,
"Enable leader election for controller manager. "+
"Enabling this will ensure there is only one active controller manager.")
pflag.StringVar(&collectorImage, "collector-image", fmt.Sprintf("ghcr.io/open-telemetry/opentelemetry-collector-releases/opentelemetry-collector:%s", v.OpenTelemetryCollector), "The default OpenTelemetry collector image. This image is used when no image is specified in the CustomResource.")
pflag.StringVar(&targetAllocatorImage, "target-allocator-image", fmt.Sprintf("ghcr.io/open-telemetry/opentelemetry-operator/target-allocator:%s", v.TargetAllocator), "The default OpenTelemetry target allocator image. This image is used when no image is specified in the CustomResource.")
pflag.StringVar(&autoInstrumentationJava, "auto-instrumentation-java-image", fmt.Sprintf("ghcr.io/open-telemetry/opentelemetry-operator/autoinstrumentation-java:%s", v.AutoInstrumentationJava), "The default OpenTelemetry Java instrumentation image. This image is used when no image is specified in the CustomResource.")
pflag.StringVar(&autoInstrumentationNodeJS, "auto-instrumentation-nodejs-image", fmt.Sprintf("ghcr.io/open-telemetry/opentelemetry-operator/autoinstrumentation-nodejs:%s", v.AutoInstrumentationNodeJS), "The default OpenTelemetry NodeJS instrumentation image. This image is used when no image is specified in the CustomResource.")
pflag.StringVar(&autoInstrumentationPython, "auto-instrumentation-python-image", fmt.Sprintf("ghcr.io/open-telemetry/opentelemetry-operator/autoinstrumentation-python:%s", v.AutoInstrumentationPython), "The default OpenTelemetry Python instrumentation image. This image is used when no image is specified in the CustomResource.")
pflag.StringArrayVar(&labelsFilter, "labels", []string{}, "Labels to filter away from propagating onto deploys")
pflag.Parse()
logger := zap.New(zap.UseFlagOptions(&opts))
ctrl.SetLogger(logger)
logger.Info("Starting the OpenTelemetry Operator",
"opentelemetry-operator", v.Operator,
"opentelemetry-collector", collectorImage,
"opentelemetry-targetallocator", targetAllocatorImage,
"auto-instrumentation-java", autoInstrumentationJava,
"auto-instrumentation-nodejs", autoInstrumentationNodeJS,
"auto-instrumentation-python", autoInstrumentationPython,
"build-date", v.BuildDate,
"go-version", v.Go,
"go-arch", runtime.GOARCH,
"go-os", runtime.GOOS,
"labels-filter", labelsFilter,
)
restConfig := ctrl.GetConfigOrDie()
// builds the operator's configuration
ad, err := autodetect.New(restConfig)
if err != nil {
setupLog.Error(err, "failed to setup auto-detect routine")
os.Exit(1)
}
cfg := config.New(
config.WithLogger(ctrl.Log.WithName("config")),
config.WithVersion(v),
config.WithCollectorImage(collectorImage),
config.WithTargetAllocatorImage(targetAllocatorImage),
config.WithAutoInstrumentationJavaImage(autoInstrumentationJava),
config.WithAutoInstrumentationNodeJSImage(autoInstrumentationNodeJS),
config.WithAutoInstrumentationPythonImage(autoInstrumentationPython),
config.WithAutoDetect(ad),
config.WithLabelFilters(labelsFilter),
)
watchNamespace, found := os.LookupEnv("WATCH_NAMESPACE")
if found {
setupLog.Info("watching namespace(s)", "namespaces", watchNamespace)
} else {
setupLog.Info("the env var WATCH_NAMESPACE isn't set, watching all namespaces")
}
// see https://github.com/openshift/library-go/blob/4362aa519714a4b62b00ab8318197ba2bba51cb7/pkg/config/leaderelection/leaderelection.go#L104
leaseDuration := time.Second * 137
renewDeadline := time.Second * 107
retryPeriod := time.Second * 26
mgrOptions := ctrl.Options{
Scheme: scheme,
MetricsBindAddress: metricsAddr,
Port: 9443,
HealthProbeBindAddress: probeAddr,
LeaderElection: enableLeaderElection,
LeaderElectionID: "9f7554c3.opentelemetry.io",
Namespace: watchNamespace,
LeaseDuration: &leaseDuration,
RenewDeadline: &renewDeadline,
RetryPeriod: &retryPeriod,
}
if strings.Contains(watchNamespace, ",") {
mgrOptions.Namespace = ""
mgrOptions.NewCache = cache.MultiNamespacedCacheBuilder(strings.Split(watchNamespace, ","))
}
mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), mgrOptions)
if err != nil {
setupLog.Error(err, "unable to start manager")
os.Exit(1)
}
ctx := ctrl.SetupSignalHandler()
err = addDependencies(ctx, mgr, cfg, v)
if err != nil {
setupLog.Error(err, "failed to add/run bootstrap dependencies to the controller manager")
os.Exit(1)
}
if err = controllers.NewReconciler(controllers.Params{
Client: mgr.GetClient(),
Log: ctrl.Log.WithName("controllers").WithName("OpenTelemetryCollector"),
Scheme: mgr.GetScheme(),
Config: cfg,
Recorder: mgr.GetEventRecorderFor("opentelemetry-operator"),
}).SetupWithManager(mgr); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "OpenTelemetryCollector")
os.Exit(1)
}
if os.Getenv("ENABLE_WEBHOOKS") != "false" {
if err = (&otelv1alpha1.OpenTelemetryCollector{}).SetupWebhookWithManager(mgr); err != nil {
setupLog.Error(err, "unable to create webhook", "webhook", "OpenTelemetryCollector")
os.Exit(1)
}
if err = (&otelv1alpha1.Instrumentation{
ObjectMeta: metav1.ObjectMeta{
Annotations: map[string]string{
otelv1alpha1.AnnotationDefaultAutoInstrumentationJava: autoInstrumentationJava,
otelv1alpha1.AnnotationDefaultAutoInstrumentationNodeJS: autoInstrumentationNodeJS,
otelv1alpha1.AnnotationDefaultAutoInstrumentationPython: autoInstrumentationPython,
},
},
}).SetupWebhookWithManager(mgr); err != nil {
setupLog.Error(err, "unable to create webhook", "webhook", "Instrumentation")
os.Exit(1)
}
mgr.GetWebhookServer().Register("/mutate-v1-pod", &webhook.Admission{
Handler: webhookhandler.NewWebhookHandler(cfg, ctrl.Log.WithName("pod-webhook"), mgr.GetClient(),
[]webhookhandler.PodMutator{
sidecar.NewMutator(logger, cfg, mgr.GetClient()),
instrumentation.NewMutator(logger, mgr.GetClient()),
}),
})
}
// +kubebuilder:scaffold:builder
if err := mgr.AddHealthzCheck("healthz", healthz.Ping); err != nil {
setupLog.Error(err, "unable to set up health check")
os.Exit(1)
}
if err := mgr.AddReadyzCheck("readyz", healthz.Ping); err != nil {
setupLog.Error(err, "unable to set up ready check")
os.Exit(1)
}
setupLog.Info("starting manager")
if err := mgr.Start(ctx); err != nil {
setupLog.Error(err, "problem running manager")
os.Exit(1)
}
}
func addDependencies(_ context.Context, mgr ctrl.Manager, cfg config.Config, v version.Version) error {
// run the auto-detect mechanism for the configuration
err := mgr.Add(manager.RunnableFunc(func(_ context.Context) error {
return cfg.StartAutoDetect()
}))
if err != nil {
return fmt.Errorf("failed to start the auto-detect mechanism: %w", err)
}
// adds the upgrade mechanism to be executed once the manager is ready
err = mgr.Add(manager.RunnableFunc(func(c context.Context) error {
up := &collectorupgrade.VersionUpgrade{
Log: ctrl.Log.WithName("collector-upgrade"),
Version: v,
Client: mgr.GetClient(),
Recorder: record.NewFakeRecorder(collectorupgrade.RecordBufferSize),
}
return up.ManagedInstances(c)
}))
if err != nil {
return fmt.Errorf("failed to upgrade OpenTelemetryCollector instances: %w", err)
}
// adds the upgrade mechanism to be executed once the manager is ready
err = mgr.Add(manager.RunnableFunc(func(c context.Context) error {
u := &instrumentationupgrade.InstrumentationUpgrade{
Logger: ctrl.Log.WithName("instrumentation-upgrade"),
DefaultAutoInstJava: cfg.AutoInstrumentationJavaImage(),
DefaultAutoInstNodeJS: cfg.AutoInstrumentationJavaImage(),
Client: mgr.GetClient(),
}
return u.ManagedInstances(c)
}))
if err != nil {
return fmt.Errorf("failed to upgrade Instrumentation instances: %w", err)
}
return nil
}