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container.go
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container.go
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// Copyright 2014 Google Inc. 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 manager
import (
"flag"
"fmt"
"sync"
"time"
"github.com/docker/docker/pkg/units"
"github.com/golang/glog"
"github.com/google/cadvisor/container"
"github.com/google/cadvisor/info"
"github.com/google/cadvisor/storage"
)
// Housekeeping interval.
var HousekeepingInterval = flag.Duration("housekeeping_interval", 1*time.Second, "Interval between container housekeepings")
var maxHousekeepingInterval = flag.Duration("max_housekeeping_interval", 60*time.Second, "Largest interval to allow between container housekeepings")
var allowDynamicHousekeeping = flag.Bool("allow_dynamic_housekeeping", true, "Whether to allow the housekeeping interval to be dynamic")
// Internal mirror of the external data structure.
type containerStat struct {
Timestamp time.Time
Data *info.ContainerStats
}
type containerInfo struct {
info.ContainerReference
Subcontainers []info.ContainerReference
Spec info.ContainerSpec
}
type containerData struct {
handler container.ContainerHandler
info containerInfo
storageDriver storage.StorageDriver
lock sync.Mutex
housekeepingInterval time.Duration
// Whether to log the usage of this container when it is updated.
logUsage bool
// Tells the container to stop.
stop chan bool
}
func (c *containerData) Start() error {
go c.housekeeping()
return nil
}
func (c *containerData) Stop() error {
c.stop <- true
return nil
}
func (c *containerData) GetInfo() (*containerInfo, error) {
// TODO(vmarmol): Consider caching this.
// Get spec and subcontainers.
err := c.updateSpec()
if err != nil {
return nil, err
}
err = c.updateSubcontainers()
if err != nil {
return nil, err
}
// Make a copy of the info for the user.
c.lock.Lock()
defer c.lock.Unlock()
return &c.info, nil
}
func newContainerData(containerName string, driver storage.StorageDriver, handler container.ContainerHandler, logUsage bool) (*containerData, error) {
if driver == nil {
return nil, fmt.Errorf("nil storage driver")
}
if handler == nil {
return nil, fmt.Errorf("nil container handler")
}
ref, err := handler.ContainerReference()
if err != nil {
return nil, err
}
cont := &containerData{
handler: handler,
storageDriver: driver,
housekeepingInterval: *HousekeepingInterval,
logUsage: logUsage,
stop: make(chan bool, 1),
}
cont.info.ContainerReference = ref
return cont, nil
}
// Determine when the next housekeeping should occur.
func (self *containerData) nextHousekeeping(lastHousekeeping time.Time) time.Time {
if *allowDynamicHousekeeping {
stats, err := self.storageDriver.RecentStats(self.info.Name, 2)
if err != nil {
glog.Warningf("Failed to get RecentStats(%q) while determining the next housekeeping: %v", self.info.Name, err)
} else if len(stats) == 2 {
// TODO(vishnuk): Use no processes as a signal.
// Raise the interval if usage hasn't changed in the last housekeeping.
if stats[0].StatsEq(stats[1]) && (self.housekeepingInterval < *maxHousekeepingInterval) {
self.housekeepingInterval *= 2
if self.housekeepingInterval > *maxHousekeepingInterval {
self.housekeepingInterval = *maxHousekeepingInterval
}
glog.V(2).Infof("Raising housekeeping interval for %q to %v", self.info.Name, self.housekeepingInterval)
} else if self.housekeepingInterval != *HousekeepingInterval {
// Lower interval back to the baseline.
self.housekeepingInterval = *HousekeepingInterval
glog.V(1).Infof("Lowering housekeeping interval for %q to %v", self.info.Name, self.housekeepingInterval)
}
}
}
return lastHousekeeping.Add(self.housekeepingInterval)
}
func (c *containerData) housekeeping() {
// Long housekeeping is either 100ms or half of the housekeeping interval.
longHousekeeping := 100 * time.Millisecond
if *HousekeepingInterval/2 < longHousekeeping {
longHousekeeping = *HousekeepingInterval / 2
}
// Housekeep every second.
glog.Infof("Start housekeeping for container %q\n", c.info.Name)
lastHousekeeping := time.Now()
for {
select {
case <-c.stop:
// Stop housekeeping when signaled.
return
default:
// Perform housekeeping.
start := time.Now()
c.housekeepingTick()
// Log if housekeeping took too long.
duration := time.Since(start)
if duration >= longHousekeeping {
glog.V(2).Infof("[%s] Housekeeping took %s", c.info.Name, duration)
}
}
// Log usage if asked to do so.
if c.logUsage {
stats, err := c.storageDriver.RecentStats(c.info.Name, 2)
if err != nil {
glog.Infof("[%s] Failed to get recent stats for logging usage: %v", c.info.Name, err)
} else if len(stats) < 2 {
// Ignore, not enough stats yet.
} else {
usageCpuNs := stats[1].Cpu.Usage.Total - stats[0].Cpu.Usage.Total
usageMemory := stats[1].Memory.Usage
usageInCores := float64(usageCpuNs) / float64(stats[1].Timestamp.Sub(stats[0].Timestamp).Nanoseconds())
usageInHuman := units.HumanSize(int64(usageMemory))
glog.Infof("[%s] %.3f cores, %s of memory", c.info.Name, usageInCores, usageInHuman)
}
}
// Schedule the next housekeeping. Sleep until that time.
nextHousekeeping := c.nextHousekeeping(lastHousekeeping)
if time.Now().Before(nextHousekeeping) {
time.Sleep(nextHousekeeping.Sub(time.Now()))
}
lastHousekeeping = nextHousekeeping
}
}
func (c *containerData) housekeepingTick() {
err := c.updateStats()
if err != nil {
glog.Infof("Failed to update stats for container \"%s\": %s", c.info.Name, err)
}
}
func (c *containerData) updateSpec() error {
spec, err := c.handler.GetSpec()
if err != nil {
return err
}
c.lock.Lock()
defer c.lock.Unlock()
c.info.Spec = spec
return nil
}
func (c *containerData) updateStats() error {
stats, err := c.handler.GetStats()
if err != nil {
return err
}
if stats == nil {
return nil
}
ref, err := c.handler.ContainerReference()
if err != nil {
return err
}
err = c.storageDriver.AddStats(ref, stats)
if err != nil {
return err
}
return nil
}
func (c *containerData) updateSubcontainers() error {
subcontainers, err := c.handler.ListContainers(container.ListSelf)
if err != nil {
return err
}
c.lock.Lock()
defer c.lock.Unlock()
c.info.Subcontainers = subcontainers
return nil
}