/
monitor.go
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/
monitor.go
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// +build linux !windows
package podmonitor
import (
"context"
"errors"
"fmt"
"time"
"go.aporeto.io/trireme-lib/monitor/config"
"go.aporeto.io/trireme-lib/monitor/extractors"
"go.aporeto.io/trireme-lib/monitor/registerer"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/event"
"sigs.k8s.io/controller-runtime/pkg/manager"
"go.uber.org/zap"
)
// PodMonitor implements a monitor that sends pod events upstream
// It is implemented as a filter on the standard DockerMonitor.
// It gets all the PU events from the DockerMonitor and if the container is the POD container from Kubernetes,
// It connects to the Kubernetes API and adds the tags that are coming from Kuberntes that cannot be found
type PodMonitor struct {
localNode string
handlers *config.ProcessorConfig
metadataExtractor extractors.PodMetadataExtractor
netclsProgrammer extractors.PodNetclsProgrammer
pidsSetMaxProcsProgrammer extractors.PodPidsSetMaxProcsProgrammer
resetNetcls extractors.ResetNetclsKubepods
sandboxExtractor extractors.PodSandboxExtractor
enableHostPods bool
workers int
kubeCfg *rest.Config
kubeClient client.Client
eventsCh chan event.GenericEvent
resyncInfo *ResyncInfoChan
}
// New returns a new kubernetes monitor.
func New() *PodMonitor {
podMonitor := &PodMonitor{
eventsCh: make(chan event.GenericEvent),
resyncInfo: NewResyncInfoChan(),
}
return podMonitor
}
// SetupConfig provides a configuration to implmentations. Every implmentation
// can have its own config type.
func (m *PodMonitor) SetupConfig(_ registerer.Registerer, cfg interface{}) error {
defaultConfig := DefaultConfig()
if cfg == nil {
cfg = defaultConfig
}
kubernetesconfig, ok := cfg.(*Config)
if !ok {
return fmt.Errorf("Invalid configuration specified (type '%T')", cfg)
}
kubernetesconfig = SetupDefaultConfig(kubernetesconfig)
// build kubernetes config
var kubeCfg *rest.Config
if len(kubernetesconfig.Kubeconfig) > 0 {
var err error
kubeCfg, err = clientcmd.BuildConfigFromFlags("", kubernetesconfig.Kubeconfig)
if err != nil {
return err
}
} else {
var err error
kubeCfg, err = rest.InClusterConfig()
if err != nil {
return err
}
}
if kubernetesconfig.MetadataExtractor == nil {
return fmt.Errorf("missing metadata extractor")
}
if kubernetesconfig.NetclsProgrammer == nil {
return fmt.Errorf("missing net_cls programmer")
}
if kubernetesconfig.ResetNetcls == nil {
return fmt.Errorf("missing reset net_cls implementation")
}
if kubernetesconfig.SandboxExtractor == nil {
return fmt.Errorf("missing SandboxExtractor implementation")
}
if kubernetesconfig.Workers < 1 {
return fmt.Errorf("number of Kubernetes monitor workers must be at least 1")
}
// Setting up Kubernetes
m.kubeCfg = kubeCfg
m.localNode = kubernetesconfig.Nodename
m.enableHostPods = kubernetesconfig.EnableHostPods
m.metadataExtractor = kubernetesconfig.MetadataExtractor
m.netclsProgrammer = kubernetesconfig.NetclsProgrammer
m.pidsSetMaxProcsProgrammer = kubernetesconfig.PidsSetMaxProcsProgrammer
m.sandboxExtractor = kubernetesconfig.SandboxExtractor
m.resetNetcls = kubernetesconfig.ResetNetcls
m.workers = kubernetesconfig.Workers
return nil
}
// Run starts the monitor.
func (m *PodMonitor) Run(ctx context.Context) error {
if m.kubeCfg == nil {
return errors.New("pod: missing kubeconfig")
}
if err := m.handlers.IsComplete(); err != nil {
return fmt.Errorf("pod: handlers are not complete: %s", err.Error())
}
// ensure to run the reset net_cls
// NOTE: we also call this during resync, however, that is not called at startup (we call ResyncWithAllPods instead before we return)
if m.resetNetcls == nil {
return errors.New("pod: missing net_cls reset implementation")
}
if err := m.resetNetcls(ctx); err != nil {
return fmt.Errorf("pod: failed to reset net_cls cgroups: %s", err.Error())
}
// starts the manager in the background and will return once it is running
// NOTE: This will block until the Kubernetes manager and all controllers are up. All errors are being handled within the function
m.startManager(ctx)
// call ResyncWithAllPods before we return from here
// this will block until every pod at this point in time has been seeing at least one `Reconcile` call
// we do this so that we build up our internal PU cache in the policy engine,
// so that when we remove stale pods on startup, we don't remove them and create them again
if err := ResyncWithAllPods(ctx, m.kubeClient, m.resyncInfo, m.eventsCh, m.localNode); err != nil {
zap.L().Warn("Pod resync failed", zap.Error(err))
}
return nil
}
// SetupHandlers sets up handlers for monitors to invoke for various events such as
// processing unit events and synchronization events. This will be called before Start()
// by the consumer of the monitor
func (m *PodMonitor) SetupHandlers(c *config.ProcessorConfig) {
m.handlers = c
}
// Resync requests to the monitor to do a resync.
func (m *PodMonitor) Resync(ctx context.Context) error {
if m.resetNetcls != nil {
if err := m.resetNetcls(ctx); err != nil {
return err
}
}
if m.kubeClient == nil {
return errors.New("pod: client has not been initialized yet")
}
return ResyncWithAllPods(ctx, m.kubeClient, m.resyncInfo, m.eventsCh, m.localNode)
}
const (
startupWarningMessage = "pod: the Kubernetes controller did not start within the last 5s. Waiting..."
)
var (
retrySleep = time.Second * 3
warningMessageSleep = time.Second * 5
warningTimeout = time.Second * 5
managerNew = manager.New
)
func (m *PodMonitor) startManager(ctx context.Context) {
var mgr manager.Manager
startTimestamp := time.Now()
controllerStarted := make(chan struct{})
go func() {
// manager.New already contacts the Kubernetes API
for {
var err error
mgr, err = managerNew(m.kubeCfg, manager.Options{})
if err != nil {
zap.L().Error("pod: new manager instantiation failed. Retrying in 3s...", zap.Error(err))
time.Sleep(retrySleep)
continue
}
break
}
// Create the delete event controller first
dc := NewDeleteController(mgr.GetClient(), m.localNode, m.handlers, m.sandboxExtractor, m.eventsCh)
for {
if err := mgr.Add(dc); err != nil {
zap.L().Error("pod: adding delete controller failed. Retrying in 3s...", zap.Error(err))
time.Sleep(retrySleep)
continue
}
break
}
// Create the main controller for the monitor
for {
if err := addController(
mgr,
newReconciler(mgr, m.handlers, m.metadataExtractor, m.netclsProgrammer, m.sandboxExtractor, m.localNode, m.enableHostPods, dc.GetDeleteCh(), dc.GetReconcileCh(), m.resyncInfo),
m.workers,
m.eventsCh,
); err != nil {
zap.L().Error("pod: adding main monitor controller failed. Retrying in 3s...", zap.Error(err))
time.Sleep(retrySleep)
continue
}
break
}
for {
if err := mgr.Add(&runnable{ch: controllerStarted}); err != nil {
zap.L().Error("pod: adding side controller failed. Retrying in 3s...", zap.Error(err))
time.Sleep(retrySleep)
continue
}
break
}
// starting the manager is a bit awkward:
// - it does not use contexts
// - we pass in a fake signal handler channel
// - we start another go routine which waits for the context to be cancelled
// and closes that channel if that is the case
for {
if err := mgr.Start(ctx.Done()); err != nil {
zap.L().Error("pod: manager start failed. Retrying in 3s...", zap.Error(err))
time.Sleep(retrySleep)
continue
}
break
}
}()
waitLoop:
for {
select {
case <-ctx.Done():
break waitLoop
case <-time.After(warningMessageSleep):
// we give everything 5 seconds to report back before we issue a warning
zap.L().Warn(startupWarningMessage)
case <-controllerStarted:
m.kubeClient = mgr.GetClient()
t := time.Since(startTimestamp)
if t > warningTimeout {
zap.L().Warn("pod: controller startup finished, but took longer than expected", zap.Duration("duration", t))
} else {
zap.L().Debug("pod: controller startup finished", zap.Duration("duration", t))
}
break waitLoop
}
}
}
type runnable struct {
ch chan struct{}
}
func (r *runnable) Start(z <-chan struct{}) error {
// close the indicator channel which means that the manager has been started successfully
close(r.ch)
// stay up and running, the manager needs that
<-z
return nil
}