After dbus restarts, make GracefulNodeShutdown work again
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parent
04b7977ef6
commit
9c59e6c85f
@ -24,7 +24,6 @@ import (
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"sync"
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"time"
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"github.com/godbus/dbus/v5"
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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/util/clock"
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utilfeature "k8s.io/apiserver/pkg/util/feature"
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@ -40,14 +39,11 @@ const (
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nodeShutdownReason = "Shutdown"
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nodeShutdownMessage = "Node is shutting, evicting pods"
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nodeShutdownNotAdmitMessage = "Node is in progress of shutting down, not admitting any new pods"
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dbusReconnectPeriod = 1 * time.Second
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)
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var systemDbus = func() (dbusInhibiter, error) {
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bus, err := dbus.SystemBus()
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if err != nil {
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return nil, err
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}
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return &systemd.DBusCon{SystemBus: bus}, nil
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return systemd.NewDBusCon()
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}
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type dbusInhibiter interface {
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@ -109,55 +105,77 @@ func (m *Manager) Start() error {
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if !m.isFeatureEnabled() {
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return nil
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}
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systemBus, err := systemDbus()
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stop, err := m.start()
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if err != nil {
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return err
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}
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go func() {
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for {
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if stop != nil {
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<-stop
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}
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time.Sleep(dbusReconnectPeriod)
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klog.V(1).InfoS("Restarting watch for node shutdown events")
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stop, err = m.start()
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if err != nil {
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klog.ErrorS(err, "Unable to watch the node for shutdown events")
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}
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}
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}()
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return nil
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}
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func (m *Manager) start() (chan struct{}, error) {
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systemBus, err := systemDbus()
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if err != nil {
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return nil, err
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}
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m.dbusCon = systemBus
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currentInhibitDelay, err := m.dbusCon.CurrentInhibitDelay()
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if err != nil {
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return err
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return nil, err
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}
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// If the logind's InhibitDelayMaxUSec as configured in (logind.conf) is less than shutdownGracePeriodRequested, attempt to update the value to shutdownGracePeriodRequested.
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if m.shutdownGracePeriodRequested > currentInhibitDelay {
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err := m.dbusCon.OverrideInhibitDelay(m.shutdownGracePeriodRequested)
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if err != nil {
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return fmt.Errorf("unable to override inhibit delay by shutdown manager: %w", err)
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return nil, fmt.Errorf("unable to override inhibit delay by shutdown manager: %v", err)
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}
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err = m.dbusCon.ReloadLogindConf()
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if err != nil {
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return err
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return nil, err
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}
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// Read the current inhibitDelay again, if the override was successful, currentInhibitDelay will be equal to shutdownGracePeriodRequested.
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updatedInhibitDelay, err := m.dbusCon.CurrentInhibitDelay()
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if err != nil {
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return err
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return nil, err
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}
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if updatedInhibitDelay != m.shutdownGracePeriodRequested {
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return fmt.Errorf("node shutdown manager was unable to update logind InhibitDelayMaxSec to %v (ShutdownGracePeriod), current value of InhibitDelayMaxSec (%v) is less than requested ShutdownGracePeriod", m.shutdownGracePeriodRequested, updatedInhibitDelay)
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return nil, fmt.Errorf("node shutdown manager was unable to update logind InhibitDelayMaxSec to %v (ShutdownGracePeriod), current value of InhibitDelayMaxSec (%v) is less than requested ShutdownGracePeriod", m.shutdownGracePeriodRequested, updatedInhibitDelay)
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}
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}
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err = m.aquireInhibitLock()
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if err != nil {
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return err
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return nil, err
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}
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events, err := m.dbusCon.MonitorShutdown()
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if err != nil {
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releaseErr := m.dbusCon.ReleaseInhibitLock(m.inhibitLock)
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if releaseErr != nil {
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return fmt.Errorf("failed releasing inhibitLock: %v and failed monitoring shutdown: %w", releaseErr, err)
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return nil, fmt.Errorf("failed releasing inhibitLock: %v and failed monitoring shutdown: %v", releaseErr, err)
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}
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return fmt.Errorf("failed to monitor shutdown: %w", err)
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return nil, fmt.Errorf("failed to monitor shutdown: %v", err)
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}
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stop := make(chan struct{})
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go func() {
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// Monitor for shutdown events. This follows the logind Inhibit Delay pattern described on https://www.freedesktop.org/wiki/Software/systemd/inhibit/
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// 1. When shutdown manager starts, an inhibit lock is taken.
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@ -165,7 +183,12 @@ func (m *Manager) Start() error {
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// 3. When shutdown(false) event is received, this indicates a previous shutdown was cancelled. In this case, acquire the inhibit lock again.
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for {
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select {
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case isShuttingDown := <-events:
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case isShuttingDown, ok := <-events:
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if !ok {
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klog.ErrorS(err, "Ended to watching the node for shutdown events")
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close(stop)
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return
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}
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klog.V(1).InfoS("Shutdown manager detected new shutdown event, isNodeShuttingDownNow", "event", isShuttingDown)
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m.nodeShuttingDownMutex.Lock()
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@ -183,7 +206,7 @@ func (m *Manager) Start() error {
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}
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}
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}()
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return nil
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return stop, nil
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}
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func (m *Manager) aquireInhibitLock() error {
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@ -47,6 +47,17 @@ type DBusCon struct {
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SystemBus dBusConnector
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}
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func NewDBusCon() (*DBusCon, error) {
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conn, err := dbus.SystemBus()
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if err != nil {
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return nil, err
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}
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return &DBusCon{
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SystemBus: conn,
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}, nil
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}
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// InhibitLock is a lock obtained after creating an systemd inhibitor by calling InhibitShutdown().
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type InhibitLock uint32
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@ -138,7 +149,11 @@ func (bus *DBusCon) MonitorShutdown() (<-chan bool, error) {
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go func() {
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for {
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event := <-busChan
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event, ok := <-busChan
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if !ok {
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close(shutdownChan)
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return
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}
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if event == nil || len(event.Body) == 0 {
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klog.ErrorS(nil, "Failed obtaining shutdown event, PrepareForShutdown event was empty")
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continue
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@ -149,7 +164,6 @@ func (bus *DBusCon) MonitorShutdown() (<-chan bool, error) {
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continue
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}
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shutdownChan <- shutdownActive
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}
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}()
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