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Add support for tracing via OpenCencus

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This adds a few flags for configuring the tracer.
Includes support for jaeger tracing (built into OC).
This commit is contained in:
Brian Goff
2018-09-19 18:01:39 -07:00
parent 43d32d2301
commit 682b2bccf8
139 changed files with 19834 additions and 42 deletions
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179
vkubelet/vkubelet.go
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@@ -14,6 +14,7 @@ import (
"github.com/virtual-kubelet/virtual-kubelet/log"
"github.com/virtual-kubelet/virtual-kubelet/manager"
"github.com/virtual-kubelet/virtual-kubelet/providers"
"go.opencensus.io/trace"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -102,8 +103,10 @@ func New(ctx context.Context, cfg Config) (s *Server, retErr error) {
go func() {
for range tick {
ctx, span := trace.StartSpan(ctx, "reconciliationTick")
s.updateNode(ctx)
s.updatePodStatuses(ctx)
span.End()
}
}()
@@ -112,6 +115,9 @@ func New(ctx context.Context, cfg Config) (s *Server, retErr error) {
// registerNode registers this virtual node with the Kubernetes API.
func (s *Server) registerNode(ctx context.Context) error {
ctx, span := trace.StartSpan(ctx, "registerNode")
defer span.End()
taints := make([]corev1.Taint, 0)
if s.taint != nil {
@@ -145,10 +151,12 @@ func (s *Server) registerNode(ctx context.Context) error {
DaemonEndpoints: *s.provider.NodeDaemonEndpoints(ctx),
},
}
addNodeAttributes(span, node)
if _, err := s.k8sClient.CoreV1().Nodes().Create(node); err != nil && !errors.IsAlreadyExists(err) {
span.SetStatus(trace.Status{Code: trace.StatusCodeUnknown, Message: err.Error()})
return err
}
span.Annotate(nil, "Registered node with k8s")
log.G(ctx).Info("Registered node")
@@ -219,6 +227,7 @@ func (s *Server) Run(ctx context.Context) error {
time.Sleep(5 * time.Second)
}
}
// Stop shutsdown the server.
@@ -229,18 +238,52 @@ func (s *Server) Stop() {
}
}
type taintsStringer []corev1.Taint
func (t taintsStringer) String() string {
var s string
for _, taint := range t {
if s == "" {
s = taint.Key + "=" + taint.Value + ":" + string(taint.Effect)
} else {
s += ", " + taint.Key + "=" + taint.Value + ":" + string(taint.Effect)
}
}
return s
}
func addNodeAttributes(span *trace.Span, n *corev1.Node) {
span.AddAttributes(
trace.StringAttribute("UID", string(n.UID)),
trace.StringAttribute("name", n.Name),
trace.StringAttribute("cluster", n.ClusterName),
)
if span.IsRecordingEvents() {
span.AddAttributes(trace.StringAttribute("taints", taintsStringer(n.Spec.Taints).String()))
}
}
// updateNode updates the node status within Kubernetes with updated NodeConditions.
func (s *Server) updateNode(ctx context.Context) {
ctx, span := trace.StartSpan(ctx, "updateNode")
defer span.End()
opts := metav1.GetOptions{}
n, err := s.k8sClient.CoreV1().Nodes().Get(s.nodeName, opts)
if err != nil && !errors.IsNotFound(err) {
log.G(ctx).WithError(err).Error("Failed to retrieve node")
span.SetStatus(trace.Status{Code: trace.StatusCodeUnknown, Message: err.Error()})
return
}
addNodeAttributes(span, n)
span.Annotate(nil, "Fetched node details from k8s")
if errors.IsNotFound(err) {
if err = s.registerNode(ctx); err != nil {
log.G(ctx).WithError(err).Error("Failed to register node")
span.SetStatus(trace.Status{Code: trace.StatusCodeUnknown, Message: err.Error()})
} else {
span.Annotate(nil, "Registered node in k8s")
}
return
}
@@ -257,6 +300,7 @@ func (s *Server) updateNode(ctx context.Context) {
n, err = s.k8sClient.CoreV1().Nodes().UpdateStatus(n)
if err != nil {
log.G(ctx).WithError(err).Error("Failed to update node")
span.SetStatus(trace.Status{Code: trace.StatusCodeUnknown, Message: err.Error()})
return
}
}
@@ -264,6 +308,9 @@ func (s *Server) updateNode(ctx context.Context) {
// reconcile is the main reconciliation loop that compares differences between Kubernetes and
// the active provider and reconciles the differences.
func (s *Server) reconcile(ctx context.Context) {
ctx, span := trace.StartSpan(ctx, "reconcile")
defer span.End()
logger := log.G(ctx)
logger.Debug("Start reconcile")
defer logger.Debug("End reconcile")
@@ -274,22 +321,39 @@ func (s *Server) reconcile(ctx context.Context) {
return
}
var deletePods []*corev1.Pod
for _, pod := range providerPods {
// Delete pods that don't exist in Kubernetes
if p := s.resourceManager.GetPod(pod.Namespace, pod.Name); p == nil || p.DeletionTimestamp != nil {
logger := logger.WithField("pod", pod.Name)
logger.Debug("Deleting pod '%s'\n", pod.Name)
if err := s.deletePod(ctx, pod); err != nil {
logger.WithError(err).Error("Error deleting pod")
continue
}
deletePods = append(deletePods, pod)
}
}
span.Annotate(nil, "Got provider pods")
// Create any pods for k8s pods that don't exist in the provider
pods := s.resourceManager.GetPods()
for _, pod := range pods {
var failedDeleteCount int64
for _, pod := range deletePods {
logger := logger.WithField("pod", pod.Name)
logger.Debug("Deleting pod '%s'\n", pod.Name)
if err := s.deletePod(ctx, pod); err != nil {
logger.WithError(err).Error("Error deleting pod")
failedDeleteCount++
continue
}
}
span.Annotate(
[]trace.Attribute{
trace.Int64Attribute("expected_delete_pods_count", int64(len(deletePods))),
trace.Int64Attribute("failed_delete_pods_count", failedDeleteCount),
},
"Cleaned up stale provider pods",
)
pods := s.resourceManager.GetPods()
var createPods []*corev1.Pod
cleanupPods := deletePods[:0]
for _, pod := range pods {
var providerPod *corev1.Pod
for _, p := range providerPods {
if p.Namespace == pod.Namespace && p.Name == pod.Name {
@@ -298,33 +362,76 @@ func (s *Server) reconcile(ctx context.Context) {
}
}
// Delete pod if DeletionTimestamp is set
if pod.DeletionTimestamp != nil {
cleanupPods = append(cleanupPods, pod)
continue
}
if providerPod == nil &&
pod.DeletionTimestamp == nil &&
pod.Status.Phase != corev1.PodSucceeded &&
pod.Status.Phase != corev1.PodFailed &&
pod.Status.Reason != PodStatusReason_ProviderFailed {
logger.Debug("Creating pod")
if err := s.createPod(ctx, pod); err != nil {
logger.WithError(err).Error("Error creating pod")
continue
}
}
// Delete pod if DeletionTimestamp is set
if pod.DeletionTimestamp != nil {
log.Trace(logger, "Pod pending deletion")
var err error
if err = s.deletePod(ctx, pod); err != nil {
logger.WithError(err).Error("Error deleting pod")
continue
}
log.Trace(logger, "Pod deletion complete")
createPods = append(createPods, pod)
}
}
var failedCreateCount int64
for _, pod := range createPods {
logger := logger.WithField("pod", pod.Name)
logger.Debug("Creating pod")
if err := s.createPod(ctx, pod); err != nil {
failedCreateCount++
logger.WithError(err).Error("Error creating pod")
continue
}
}
span.Annotate(
[]trace.Attribute{
trace.Int64Attribute("expected_created_pods", int64(len(createPods))),
trace.Int64Attribute("failed_pod_creates", failedCreateCount),
},
"Created pods in provider",
)
var failedCleanupCount int64
for _, pod := range cleanupPods {
logger := logger.WithField("pod", pod.Name)
log.Trace(logger, "Pod pending deletion")
var err error
if err = s.deletePod(ctx, pod); err != nil {
logger.WithError(err).Error("Error deleting pod")
failedCleanupCount++
continue
}
log.Trace(logger, "Pod deletion complete")
}
span.Annotate(
[]trace.Attribute{
trace.Int64Attribute("expected_cleaned_up_pods", int64(len(cleanupPods))),
trace.Int64Attribute("cleaned_up_pod_failures", failedCleanupCount),
},
"Cleaned up provider pods marked for deletion",
)
}
func addPodAttributes(span *trace.Span, pod *corev1.Pod) {
span.AddAttributes(
trace.StringAttribute("uid", string(pod.UID)),
trace.StringAttribute("namespace", pod.Namespace),
trace.StringAttribute("name", pod.Name),
)
}
func (s *Server) createPod(ctx context.Context, pod *corev1.Pod) error {
ctx, span := trace.StartSpan(ctx, "createPod")
defer span.End()
addPodAttributes(span, pod)
if err := s.populateSecretsAndConfigMapsInEnv(pod); err != nil {
span.SetStatus(trace.Status{Code: trace.StatusCodeInvalidArgument, Message: err.Error()})
return err
}
@@ -344,10 +451,14 @@ func (s *Server) createPod(ctx context.Context, pod *corev1.Pod) error {
_, err := s.k8sClient.CoreV1().Pods(pod.Namespace).UpdateStatus(pod)
if err != nil {
logger.WithError(err).Warn("Failed to update pod status")
} else {
span.Annotate(nil, "Updated k8s pod status")
}
span.SetStatus(trace.Status{Code: trace.StatusCodeUnknown, Message: origErr.Error()})
return origErr
}
span.Annotate(nil, "Created pod in provider")
logger.Info("Pod created")
@@ -355,24 +466,33 @@ func (s *Server) createPod(ctx context.Context, pod *corev1.Pod) error {
}
func (s *Server) deletePod(ctx context.Context, pod *corev1.Pod) error {
ctx, span := trace.StartSpan(ctx, "deletePod")
defer span.End()
addPodAttributes(span, pod)
var delErr error
if delErr = s.provider.DeletePod(ctx, pod); delErr != nil && errors.IsNotFound(delErr) {
span.SetStatus(trace.Status{Code: trace.StatusCodeUnknown, Message: delErr.Error()})
return delErr
}
span.Annotate(nil, "Deleted pod from provider")
logger := log.G(ctx).WithField("pod", pod.Name)
if !errors.IsNotFound(delErr) {
var grace int64
if err := s.k8sClient.CoreV1().Pods(pod.Namespace).Delete(pod.Name, &metav1.DeleteOptions{GracePeriodSeconds: &grace}); err != nil && errors.IsNotFound(err) {
if errors.IsNotFound(err) {
logger.Error("Pod doesn't exist")
span.Annotate(nil, "Pod does not exist in k8s, nothing to delete")
return nil
}
span.SetStatus(trace.Status{Code: trace.StatusCodeUnknown, Message: err.Error()})
return fmt.Errorf("Failed to delete kubernetes pod: %s", err)
}
span.Annotate(nil, "Deleted pod from k8s")
s.resourceManager.DeletePod(pod)
span.Annotate(nil, "Deleted pod from internal state")
logger.Info("Pod deleted")
}
@@ -381,8 +501,13 @@ func (s *Server) deletePod(ctx context.Context, pod *corev1.Pod) error {
// updatePodStatuses syncs the providers pod status with the kubernetes pod status.
func (s *Server) updatePodStatuses(ctx context.Context) {
ctx, span := trace.StartSpan(ctx, "updatePodStatuses")
defer span.End()
// Update all the pods with the provider status.
pods := s.resourceManager.GetPods()
span.AddAttributes(trace.Int64Attribute("nPods", int64(len(pods))))
for _, pod := range pods {
if pod.Status.Phase == corev1.PodSucceeded ||
pod.Status.Phase == corev1.PodFailed ||