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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"
"math"
"path"
"strings"
"time"
"github.com/docker/libcontainer/cgroups"
cgroup_fs "github.com/docker/libcontainer/cgroups/fs"
libcontainerConfigs "github.com/docker/libcontainer/configs"
"github.com/fsouza/go-dockerclient"
"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"
)
// Path to aufs dir where all the files exist.
// aufs/layers is ignored here since it does not hold a lot of data.
// aufs/mnt contains the mount points used to compose the rootfs. Hence it is also ignored.
var pathToAufsDir = "aufs/diff"
type dockerContainerHandler struct {
client *docker.Client
name string
id string
aliases []string
machineInfoFactory info.MachineInfoFactory
// Path to the libcontainer config file.
libcontainerConfigPath string
// Path to the libcontainer state file.
libcontainerStatePath string
// TODO(vmarmol): Remove when we depend on a newer Docker.
// Path to the libcontainer pid file.
libcontainerPidPath string
// 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
usesAufsDriver bool
fsInfo fs.FsInfo
storageDirs []string
// Time at which this container was created.
creationTime time.Time
// Metadata labels associated with the container.
labels map[string]string
}
func newDockerContainerHandler(
client *docker.Client,
name string,
machineInfoFactory info.MachineInfoFactory,
fsInfo fs.FsInfo,
usesAufsDriver bool,
cgroupSubsystems *containerLibcontainer.CgroupSubsystems,
) (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 := &cgroup_fs.Manager{
Cgroups: &libcontainerConfigs.Cgroup{
Name: name,
},
Paths: cgroupPaths,
}
id := ContainerNameToDockerId(name)
handler := &dockerContainerHandler{
id: id,
client: client,
name: name,
machineInfoFactory: machineInfoFactory,
cgroupPaths: cgroupPaths,
cgroupManager: cgroupManager,
usesAufsDriver: usesAufsDriver,
fsInfo: fsInfo,
}
handler.storageDirs = append(handler.storageDirs, path.Join(*dockerRootDir, pathToAufsDir, id))
// 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
// Add the name and bare ID as aliases of the container.
handler.aliases = append(handler.aliases, strings.TrimPrefix(ctnr.Name, "/"))
handler.aliases = append(handler.aliases, id)
handler.labels = ctnr.Config.Labels
return handler, nil
}
func (self *dockerContainerHandler) ContainerReference() (info.ContainerReference, error) {
return info.ContainerReference{
Name: self.name,
Aliases: self.aliases,
Namespace: DockerNamespace,
}, 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.Memory > 0 {
spec.Memory.Limit = uint64(config.Cgroups.Memory)
}
if config.Cgroups.MemorySwap > 0 {
spec.Memory.SwapLimit = uint64(config.Cgroups.MemorySwap)
}
// Get CPU info
spec.HasCpu = true
spec.Cpu.Limit = 1024
if config.Cgroups.CpuShares != 0 {
spec.Cpu.Limit = uint64(config.Cgroups.CpuShares)
}
spec.Cpu.Mask = utils.FixCpuMask(config.Cgroups.CpusetCpus, mi.NumCores)
spec.HasNetwork = true
spec.HasDiskIo = true
return spec
}
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.usesAufsDriver {
spec.HasFilesystem = true
}
spec.Labels = self.labels
return spec, err
}
func (self *dockerContainerHandler) getFsStats(stats *info.ContainerStats) error {
// No support for non-aufs storage drivers.
if !self.usesAufsDriver {
return nil
}
// As of now we assume that all the storage dirs are on the same device.
// The first storage dir will be that of the image layers.
deviceInfo, err := self.fsInfo.GetDirFsDevice(self.storageDirs[0])
if err != nil {
return err
}
mi, err := self.machineInfoFactory.GetMachineInfo()
if err != nil {
return err
}
var limit uint64 = 0
// 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
break
}
}
fsStat := info.FsStats{Device: deviceInfo.Device, Limit: limit}
var usage uint64 = 0
for _, dir := range self.storageDirs {
// TODO(Vishh): Add support for external mounts.
dirUsage, err := self.fsInfo.GetDirUsage(dir)
if err != nil {
return err
}
usage += dirUsage
}
fsStat.Usage = 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) {
config, err := self.readLibcontainerConfig()
if err != nil {
return nil, err
}
var networkInterfaces []string
if len(config.Networks) > 0 {
// ContainerStats only reports stat for one network device.
// TODO(vmarmol): Handle multiple physical network devices.
for _, n := range config.Networks {
// Take the first non-loopback.
if n.Type != "loopback" {
networkInterfaces = []string{n.HostInterfaceName}
break
}
}
}
stats, err := containerLibcontainer.GetStats(self.cgroupManager, networkInterfaces)
if err != nil {
return stats, err
}
// TODO(rjnagal): Remove the conversion when network stats are read from libcontainer.
convertInterfaceStats(&stats.Network.InterfaceStats)
for i := range stats.Network.Interfaces {
convertInterfaceStats(&stats.Network.Interfaces[i])
}
// Get filesystem stats.
err = self.getFsStats(stats)
if err != nil {
return stats, err
}
return stats, nil
}
func convertInterfaceStats(stats *info.InterfaceStats) {
net := stats
// Ingress for host veth is from the container.
// Hence tx_bytes stat on the host veth is actually number of bytes received by the container.
stats.RxBytes = net.TxBytes
stats.RxPackets = net.TxPackets
stats.RxErrors = net.TxErrors
stats.RxDropped = net.TxDropped
stats.TxBytes = net.RxBytes
stats.TxPackets = net.RxPackets
stats.TxErrors = net.RxErrors
stats.TxDropped = net.RxDropped
}
func (self *dockerContainerHandler) ListContainers(listType container.ListType) ([]info.ContainerReference, error) {
if self.name != "/docker" {
return []info.ContainerReference{}, nil
}
opt := docker.ListContainersOptions{
All: true,
}
containers, err := self.client.ListContainers(opt)
if err != nil {
return nil, err
}
ret := make([]info.ContainerReference, 0, len(containers)+1)
for _, c := range containers {
if !strings.HasPrefix(c.Status, "Up ") {
continue
}
ref := info.ContainerReference{
Name: FullContainerName(c.ID),
Aliases: append(c.Names, c.ID),
Namespace: DockerNamespace,
}
ret = append(ret, ref)
}
return ret, 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) 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 := docker.NewClient(*ArgDockerEndpoint)
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 := docker.NewClient(*ArgDockerEndpoint)
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
}