active_deadline.go

Documentation: k8s.io/kubernetes/pkg/kubelet

     1  /*
     2  Copyright 2016 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package kubelet
    18  
    19  import (
    20  	"fmt"
    21  	"time"
    22  
    23  	"k8s.io/api/core/v1"
    24  	"k8s.io/client-go/tools/record"
    25  	"k8s.io/kubernetes/pkg/kubelet/lifecycle"
    26  	"k8s.io/kubernetes/pkg/kubelet/status"
    27  	"k8s.io/utils/clock"
    28  )
    29  
    30  const (
    31  	reason  = "DeadlineExceeded"
    32  	message = "Pod was active on the node longer than the specified deadline"
    33  )
    34  
    35  // activeDeadlineHandler knows how to enforce active deadlines on pods.
    36  type activeDeadlineHandler struct {
    37  	// the clock to use for deadline enforcement
    38  	clock clock.Clock
    39  	// the provider of pod status
    40  	podStatusProvider status.PodStatusProvider
    41  	// the recorder to dispatch events when we identify a pod has exceeded active deadline
    42  	recorder record.EventRecorder
    43  }
    44  
    45  // newActiveDeadlineHandler returns an active deadline handler that can enforce pod active deadline
    46  func newActiveDeadlineHandler(
    47  	podStatusProvider status.PodStatusProvider,
    48  	recorder record.EventRecorder,
    49  	clock clock.Clock,
    50  ) (*activeDeadlineHandler, error) {
    51  
    52  	// check for all required fields
    53  	if clock == nil || podStatusProvider == nil || recorder == nil {
    54  		return nil, fmt.Errorf("required arguments must not be nil: %v, %v, %v", clock, podStatusProvider, recorder)
    55  	}
    56  	return &activeDeadlineHandler{
    57  		clock:             clock,
    58  		podStatusProvider: podStatusProvider,
    59  		recorder:          recorder,
    60  	}, nil
    61  }
    62  
    63  // ShouldSync returns true if the pod is past its active deadline.
    64  func (m *activeDeadlineHandler) ShouldSync(pod *v1.Pod) bool {
    65  	return m.pastActiveDeadline(pod)
    66  }
    67  
    68  // ShouldEvict returns true if the pod is past its active deadline.
    69  // It dispatches an event that the pod should be evicted if it is past its deadline.
    70  func (m *activeDeadlineHandler) ShouldEvict(pod *v1.Pod) lifecycle.ShouldEvictResponse {
    71  	if !m.pastActiveDeadline(pod) {
    72  		return lifecycle.ShouldEvictResponse{Evict: false}
    73  	}
    74  	m.recorder.Eventf(pod, v1.EventTypeNormal, reason, message)
    75  	return lifecycle.ShouldEvictResponse{Evict: true, Reason: reason, Message: message}
    76  }
    77  
    78  // pastActiveDeadline returns true if the pod has been active for more than its ActiveDeadlineSeconds
    79  func (m *activeDeadlineHandler) pastActiveDeadline(pod *v1.Pod) bool {
    80  	// no active deadline was specified
    81  	if pod.Spec.ActiveDeadlineSeconds == nil {
    82  		return false
    83  	}
    84  	// get the latest status to determine if it was started
    85  	podStatus, ok := m.podStatusProvider.GetPodStatus(pod.UID)
    86  	if !ok {
    87  		podStatus = pod.Status
    88  	}
    89  	// we have no start time so just return
    90  	if podStatus.StartTime.IsZero() {
    91  		return false
    92  	}
    93  	// determine if the deadline was exceeded
    94  	start := podStatus.StartTime.Time
    95  	duration := m.clock.Since(start)
    96  	allowedDuration := time.Duration(*pod.Spec.ActiveDeadlineSeconds) * time.Second
    97  	return duration >= allowedDuration
    98  }
    99
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