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handler.go
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handler.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.
// Handler for Docker containers.
package docker
import (
"fmt"
"io/ioutil"
"math"
"path"
"strings"
"time"
"github.com/google/cadvisor/container"
containerlibcontainer "github.com/google/cadvisor/container/libcontainer"
"github.com/google/cadvisor/fs"
info "github.com/google/cadvisor/info/v1"
"github.com/google/cadvisor/utils"
docker "github.com/fsouza/go-dockerclient"
"github.com/opencontainers/runc/libcontainer/cgroups"
cgroupfs "github.com/opencontainers/runc/libcontainer/cgroups/fs"
libcontainerconfigs "github.com/opencontainers/runc/libcontainer/configs"
)
const (
// The read write layers exist here.
aufsRWLayer = "diff"
// Path to the directory where docker stores log files if the json logging driver is enabled.
pathToContainersDir = "containers"
)
type dockerContainerHandler struct {
client *docker.Client
name string
id string
aliases []string
machineInfoFactory info.MachineInfoFactory
// Absolute path to the cgroup hierarchies of this container.
// (e.g.: "cpu" -> "/sys/fs/cgroup/cpu/test")
cgroupPaths map[string]string
// Manager of this container's cgroups.
cgroupManager cgroups.Manager
storageDriver storageDriver
fsInfo fs.FsInfo
rootfsStorageDir string
// Time at which this container was created.
creationTime time.Time
// Metadata associated with the container.
labels map[string]string
envs map[string]string
// The container PID used to switch namespaces as required
pid int
// Image name used for this container.
image string
// The host root FS to read
rootFs string
// The network mode of the container
networkMode string
// Filesystem handler.
fsHandler fsHandler
ignoreMetrics container.MetricSet
}
func getRwLayerID(containerID, storageDir string, sd storageDriver, dockerVersion []int) (string, error) {
const (
// Docker version >=1.10.0 have a randomized ID for the root fs of a container.
randomizedRWLayerMinorVersion = 10
rwLayerIDFile = "mount-id"
)
if (dockerVersion[0] <= 1) && (dockerVersion[1] < randomizedRWLayerMinorVersion) {
return containerID, nil
}
bytes, err := ioutil.ReadFile(path.Join(storageDir, "image", string(sd), "layerdb", "mounts", containerID, rwLayerIDFile))
if err != nil {
return "", fmt.Errorf("failed to identify the read-write layer ID for container %q. - %v", containerID, err)
}
return string(bytes), err
}
func newDockerContainerHandler(
client *docker.Client,
name string,
machineInfoFactory info.MachineInfoFactory,
fsInfo fs.FsInfo,
storageDriver storageDriver,
storageDir string,
cgroupSubsystems *containerlibcontainer.CgroupSubsystems,
inHostNamespace bool,
metadataEnvs []string,
dockerVersion []int,
ignoreMetrics container.MetricSet,
) (container.ContainerHandler, error) {
// Create the cgroup paths.
cgroupPaths := make(map[string]string, len(cgroupSubsystems.MountPoints))
for key, val := range cgroupSubsystems.MountPoints {
cgroupPaths[key] = path.Join(val, name)
}
// Generate the equivalent cgroup manager for this container.
cgroupManager := &cgroupfs.Manager{
Cgroups: &libcontainerconfigs.Cgroup{
Name: name,
},
Paths: cgroupPaths,
}
rootFs := "/"
if !inHostNamespace {
rootFs = "/rootfs"
storageDir = path.Join(rootFs, storageDir)
}
id := ContainerNameToDockerId(name)
// Add the Containers dir where the log files are stored.
// FIXME: Give `otherStorageDir` a more descriptive name.
otherStorageDir := path.Join(storageDir, pathToContainersDir, id)
rwLayerID, err := getRwLayerID(id, storageDir, storageDriver, dockerVersion)
if err != nil {
return nil, err
}
var rootfsStorageDir string
switch storageDriver {
case aufsStorageDriver:
rootfsStorageDir = path.Join(storageDir, string(aufsStorageDriver), aufsRWLayer, rwLayerID)
case overlayStorageDriver:
rootfsStorageDir = path.Join(storageDir, string(overlayStorageDriver), rwLayerID)
}
handler := &dockerContainerHandler{
id: id,
client: client,
name: name,
machineInfoFactory: machineInfoFactory,
cgroupPaths: cgroupPaths,
cgroupManager: cgroupManager,
storageDriver: storageDriver,
fsInfo: fsInfo,
rootFs: rootFs,
rootfsStorageDir: rootfsStorageDir,
envs: make(map[string]string),
ignoreMetrics: ignoreMetrics,
}
if !ignoreMetrics.Has(container.DiskUsageMetrics) {
handler.fsHandler = newFsHandler(time.Minute, rootfsStorageDir, otherStorageDir, fsInfo)
}
// We assume that if Inspect fails then the container is not known to docker.
ctnr, err := client.InspectContainer(id)
if err != nil {
return nil, fmt.Errorf("failed to inspect container %q: %v", id, err)
}
handler.creationTime = ctnr.Created
handler.pid = ctnr.State.Pid
// Add the name and bare ID as aliases of the container.
handler.aliases = append(handler.aliases, strings.TrimPrefix(ctnr.Name, "/"), id)
handler.labels = ctnr.Config.Labels
handler.image = ctnr.Config.Image
handler.networkMode = ctnr.HostConfig.NetworkMode
// split env vars to get metadata map.
for _, exposedEnv := range metadataEnvs {
for _, envVar := range ctnr.Config.Env {
splits := strings.SplitN(envVar, "=", 2)
if splits[0] == exposedEnv {
handler.envs[strings.ToLower(exposedEnv)] = splits[1]
}
}
}
return handler, nil
}
func (self *dockerContainerHandler) Start() {
// Start the filesystem handler.
if self.fsHandler != nil {
self.fsHandler.start()
}
}
func (self *dockerContainerHandler) Cleanup() {
if self.fsHandler != nil {
self.fsHandler.stop()
}
}
func (self *dockerContainerHandler) ContainerReference() (info.ContainerReference, error) {
return info.ContainerReference{
Id: self.id,
Name: self.name,
Aliases: self.aliases,
Namespace: DockerNamespace,
Labels: self.labels,
}, nil
}
func (self *dockerContainerHandler) readLibcontainerConfig() (*libcontainerconfigs.Config, error) {
config, err := containerlibcontainer.ReadConfig(*dockerRootDir, *dockerRunDir, self.id)
if err != nil {
return nil, fmt.Errorf("failed to read libcontainer config: %v", err)
}
// Replace cgroup parent and name with our own since we may be running in a different context.
if config.Cgroups == nil {
config.Cgroups = new(libcontainerconfigs.Cgroup)
}
config.Cgroups.Name = self.name
config.Cgroups.Parent = "/"
return config, nil
}
func libcontainerConfigToContainerSpec(config *libcontainerconfigs.Config, mi *info.MachineInfo) info.ContainerSpec {
var spec info.ContainerSpec
spec.HasMemory = true
spec.Memory.Limit = math.MaxUint64
spec.Memory.SwapLimit = math.MaxUint64
if config.Cgroups.Resources != nil {
if config.Cgroups.Resources.Memory > 0 {
spec.Memory.Limit = uint64(config.Cgroups.Resources.Memory)
}
if config.Cgroups.Resources.MemorySwap > 0 {
spec.Memory.SwapLimit = uint64(config.Cgroups.Resources.MemorySwap)
}
// Get CPU info
spec.HasCpu = true
spec.Cpu.Limit = 1024
if config.Cgroups.Resources.CpuShares != 0 {
spec.Cpu.Limit = uint64(config.Cgroups.Resources.CpuShares)
}
spec.Cpu.Mask = utils.FixCpuMask(config.Cgroups.Resources.CpusetCpus, mi.NumCores)
}
spec.HasDiskIo = true
return spec
}
func (self *dockerContainerHandler) needNet() bool {
if !self.ignoreMetrics.Has(container.NetworkUsageMetrics) {
return !strings.HasPrefix(self.networkMode, "container:")
}
return false
}
func (self *dockerContainerHandler) GetSpec() (info.ContainerSpec, error) {
mi, err := self.machineInfoFactory.GetMachineInfo()
if err != nil {
return info.ContainerSpec{}, err
}
libcontainerConfig, err := self.readLibcontainerConfig()
if err != nil {
return info.ContainerSpec{}, err
}
spec := libcontainerConfigToContainerSpec(libcontainerConfig, mi)
spec.CreationTime = self.creationTime
if !self.ignoreMetrics.Has(container.DiskUsageMetrics) {
switch self.storageDriver {
case aufsStorageDriver, overlayStorageDriver, zfsStorageDriver:
spec.HasFilesystem = true
}
}
spec.Labels = self.labels
spec.Envs = self.envs
spec.Image = self.image
spec.HasNetwork = self.needNet()
return spec, err
}
func (self *dockerContainerHandler) getFsStats(stats *info.ContainerStats) error {
if self.ignoreMetrics.Has(container.DiskUsageMetrics) {
return nil
}
switch self.storageDriver {
case aufsStorageDriver, overlayStorageDriver, zfsStorageDriver:
default:
return nil
}
deviceInfo, err := self.fsInfo.GetDirFsDevice(self.rootfsStorageDir)
if err != nil {
return err
}
mi, err := self.machineInfoFactory.GetMachineInfo()
if err != nil {
return err
}
var (
limit uint64
fsType string
)
// Docker does not impose any filesystem limits for containers. So use capacity as limit.
for _, fs := range mi.Filesystems {
if fs.Device == deviceInfo.Device {
limit = fs.Capacity
fsType = fs.Type
break
}
}
fsStat := info.FsStats{Device: deviceInfo.Device, Type: fsType, Limit: limit}
fsStat.BaseUsage, fsStat.Usage = self.fsHandler.usage()
stats.Filesystem = append(stats.Filesystem, fsStat)
return nil
}
// TODO(vmarmol): Get from libcontainer API instead of cgroup manager when we don't have to support older Dockers.
func (self *dockerContainerHandler) GetStats() (*info.ContainerStats, error) {
stats, err := containerlibcontainer.GetStats(self.cgroupManager, self.rootFs, self.pid, self.ignoreMetrics)
if err != nil {
return stats, err
}
// Clean up stats for containers that don't have their own network - this
// includes containers running in Kubernetes pods that use the network of the
// infrastructure container. This stops metrics being reported multiple times
// for each container in a pod.
if !self.needNet() {
stats.Network = info.NetworkStats{}
}
// Get filesystem stats.
err = self.getFsStats(stats)
if err != nil {
return stats, err
}
return stats, nil
}
func (self *dockerContainerHandler) ListContainers(listType container.ListType) ([]info.ContainerReference, error) {
// No-op for Docker driver.
return []info.ContainerReference{}, nil
}
func (self *dockerContainerHandler) GetCgroupPath(resource string) (string, error) {
path, ok := self.cgroupPaths[resource]
if !ok {
return "", fmt.Errorf("could not find path for resource %q for container %q\n", resource, self.name)
}
return path, nil
}
func (self *dockerContainerHandler) ListThreads(listType container.ListType) ([]int, error) {
// TODO(vmarmol): Implement.
return nil, nil
}
func (self *dockerContainerHandler) GetContainerLabels() map[string]string {
return self.labels
}
func (self *dockerContainerHandler) ListProcesses(listType container.ListType) ([]int, error) {
return containerlibcontainer.GetProcesses(self.cgroupManager)
}
func (self *dockerContainerHandler) WatchSubcontainers(events chan container.SubcontainerEvent) error {
return fmt.Errorf("watch is unimplemented in the Docker container driver")
}
func (self *dockerContainerHandler) StopWatchingSubcontainers() error {
// No-op for Docker driver.
return nil
}
func (self *dockerContainerHandler) Exists() bool {
return containerlibcontainer.Exists(*dockerRootDir, *dockerRunDir, self.id)
}
func DockerInfo() (map[string]string, error) {
client, err := Client()
if err != nil {
return nil, fmt.Errorf("unable to communicate with docker daemon: %v", err)
}
info, err := client.Info()
if err != nil {
return nil, err
}
return info.Map(), nil
}
func DockerImages() ([]docker.APIImages, error) {
client, err := Client()
if err != nil {
return nil, fmt.Errorf("unable to communicate with docker daemon: %v", err)
}
images, err := client.ListImages(docker.ListImagesOptions{All: false})
if err != nil {
return nil, err
}
return images, nil
}