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prober_manager.go
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/
prober_manager.go
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/*
Copyright 2015 The Kubernetes Authors 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 prober
import (
"sync"
"github.com/golang/glog"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/client/record"
kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
"k8s.io/kubernetes/pkg/kubelet/prober/results"
"k8s.io/kubernetes/pkg/kubelet/status"
"k8s.io/kubernetes/pkg/kubelet/util/format"
"k8s.io/kubernetes/pkg/types"
"k8s.io/kubernetes/pkg/util/sets"
"k8s.io/kubernetes/pkg/util/wait"
)
// Manager manages pod probing. It creates a probe "worker" for every container that specifies a
// probe (AddPod). The worker periodically probes its assigned container and caches the results. The
// manager use the cached probe results to set the appropriate Ready state in the PodStatus when
// requested (UpdatePodStatus). Updating probe parameters is not currently supported.
// TODO: Move liveness probing out of the runtime, to here.
type Manager interface {
// AddPod creates new probe workers for every container probe. This should be called for every
// pod created.
AddPod(pod *api.Pod)
// RemovePod handles cleaning up the removed pod state, including terminating probe workers and
// deleting cached results.
RemovePod(pod *api.Pod)
// CleanupPods handles cleaning up pods which should no longer be running.
// It takes a list of "active pods" which should not be cleaned up.
CleanupPods(activePods []*api.Pod)
// UpdatePodStatus modifies the given PodStatus with the appropriate Ready state for each
// container based on container running status, cached probe results and worker states.
UpdatePodStatus(types.UID, *api.PodStatus)
// Start starts the Manager sync loops.
Start()
}
type manager struct {
// Map of active workers for probes
workers map[probeKey]*worker
// Lock for accessing & mutating workers
workerLock sync.RWMutex
// The statusManager cache provides pod IP and container IDs for probing.
statusManager status.Manager
// readinessManager manages the results of readiness probes
readinessManager results.Manager
// livenessManager manages the results of liveness probes
livenessManager results.Manager
// prober executes the probe actions.
prober *prober
}
func NewManager(
statusManager status.Manager,
livenessManager results.Manager,
runner kubecontainer.ContainerCommandRunner,
refManager *kubecontainer.RefManager,
recorder record.EventRecorder) Manager {
prober := newProber(runner, refManager, recorder)
readinessManager := results.NewManager()
return &manager{
statusManager: statusManager,
prober: prober,
readinessManager: readinessManager,
livenessManager: livenessManager,
workers: make(map[probeKey]*worker),
}
}
// Start syncing probe status. This should only be called once.
func (m *manager) Start() {
// Start syncing readiness.
go wait.Forever(m.updateReadiness, 0)
}
// Key uniquely identifying container probes
type probeKey struct {
podUID types.UID
containerName string
probeType probeType
}
// Type of probe (readiness or liveness)
type probeType int
const (
liveness probeType = iota
readiness
)
// For debugging.
func (t probeType) String() string {
switch t {
case readiness:
return "Readiness"
case liveness:
return "Liveness"
default:
return "UNKNOWN"
}
}
func (m *manager) AddPod(pod *api.Pod) {
m.workerLock.Lock()
defer m.workerLock.Unlock()
key := probeKey{podUID: pod.UID}
for _, c := range pod.Spec.Containers {
key.containerName = c.Name
if c.ReadinessProbe != nil {
key.probeType = readiness
if _, ok := m.workers[key]; ok {
glog.Errorf("Readiness probe already exists! %v - %v",
format.Pod(pod), c.Name)
return
}
w := newWorker(m, readiness, pod, c)
m.workers[key] = w
go w.run()
}
if c.LivenessProbe != nil {
key.probeType = liveness
if _, ok := m.workers[key]; ok {
glog.Errorf("Liveness probe already exists! %v - %v",
format.Pod(pod), c.Name)
return
}
w := newWorker(m, liveness, pod, c)
m.workers[key] = w
go w.run()
}
}
}
func (m *manager) RemovePod(pod *api.Pod) {
m.workerLock.RLock()
defer m.workerLock.RUnlock()
key := probeKey{podUID: pod.UID}
for _, c := range pod.Spec.Containers {
key.containerName = c.Name
for _, probeType := range [...]probeType{readiness, liveness} {
key.probeType = probeType
if worker, ok := m.workers[key]; ok {
worker.stop()
}
}
}
}
func (m *manager) CleanupPods(activePods []*api.Pod) {
desiredPods := make(map[types.UID]sets.Empty)
for _, pod := range activePods {
desiredPods[pod.UID] = sets.Empty{}
}
m.workerLock.RLock()
defer m.workerLock.RUnlock()
for key, worker := range m.workers {
if _, ok := desiredPods[key.podUID]; !ok {
worker.stop()
}
}
}
func (m *manager) UpdatePodStatus(podUID types.UID, podStatus *api.PodStatus) {
for i, c := range podStatus.ContainerStatuses {
var ready bool
if c.State.Running == nil {
ready = false
} else if result, ok := m.readinessManager.Get(kubecontainer.ParseContainerID(c.ContainerID)); ok {
ready = result == results.Success
} else {
// The check whether there is a probe which hasn't run yet.
_, exists := m.getWorker(podUID, c.Name, readiness)
ready = !exists
}
podStatus.ContainerStatuses[i].Ready = ready
}
// init containers are ready if they have exited with success or if a readiness probe has
// succeeded.
for i, c := range podStatus.InitContainerStatuses {
var ready bool
if c.State.Terminated != nil && c.State.Terminated.ExitCode == 0 {
ready = true
}
podStatus.InitContainerStatuses[i].Ready = ready
}
}
func (m *manager) getWorker(podUID types.UID, containerName string, probeType probeType) (*worker, bool) {
m.workerLock.RLock()
defer m.workerLock.RUnlock()
worker, ok := m.workers[probeKey{podUID, containerName, probeType}]
return worker, ok
}
// Called by the worker after exiting.
func (m *manager) removeWorker(podUID types.UID, containerName string, probeType probeType) {
m.workerLock.Lock()
defer m.workerLock.Unlock()
delete(m.workers, probeKey{podUID, containerName, probeType})
}
// workerCount returns the total number of probe workers. For testing.
func (m *manager) workerCount() int {
m.workerLock.Lock()
defer m.workerLock.Unlock()
return len(m.workers)
}
func (m *manager) updateReadiness() {
update := <-m.readinessManager.Updates()
ready := update.Result == results.Success
m.statusManager.SetContainerReadiness(update.PodUID, update.ContainerID, ready)
}