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factory.go
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factory.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 docker
import (
"flag"
"fmt"
"path"
"regexp"
"strconv"
"strings"
"github.com/docker/libcontainer/cgroups"
"github.com/docker/libcontainer/cgroups/systemd"
"github.com/fsouza/go-dockerclient"
"github.com/golang/glog"
"github.com/google/cadvisor/container"
"github.com/google/cadvisor/container/libcontainer"
"github.com/google/cadvisor/fs"
info "github.com/google/cadvisor/info/v1"
"github.com/google/cadvisor/utils"
)
var ArgDockerEndpoint = flag.String("docker", "unix:///var/run/docker.sock", "docker endpoint")
// The namespace under which Docker aliases are unique.
var DockerNamespace = "docker"
// Basepath to all container specific information that libcontainer stores.
var dockerRootDir = flag.String("docker_root", "/var/lib/docker", "Absolute path to the Docker state root directory (default: /var/lib/docker)")
// Whether the system is using Systemd.
var useSystemd bool
func init() {
useSystemd = systemd.UseSystemd()
if !useSystemd {
// Second attempt at checking for systemd, check for a "name=systemd" cgroup.
mnt, err := cgroups.FindCgroupMountpoint("cpu")
if err == nil {
// systemd presence does not mean systemd controls cgroups.
// If system.slice cgroup exists, then systemd is taking control.
// This breaks if user creates system.slice manually :)
useSystemd = utils.FileExists(mnt + "/system.slice")
}
}
}
func UseSystemd() bool {
// init would run and initialize useSystemd before we can call this method.
return useSystemd
}
func RootDir() string {
return *dockerRootDir
}
type dockerFactory struct {
machineInfoFactory info.MachineInfoFactory
// Whether docker is running with AUFS storage driver.
usesAufsDriver bool
client *docker.Client
// Information about the mounted cgroup subsystems.
cgroupSubsystems libcontainer.CgroupSubsystems
// Information about mounted filesystems.
fsInfo fs.FsInfo
}
func (self *dockerFactory) String() string {
return DockerNamespace
}
func (self *dockerFactory) NewContainerHandler(name string) (handler container.ContainerHandler, err error) {
client, err := docker.NewClient(*ArgDockerEndpoint)
if err != nil {
return
}
handler, err = newDockerContainerHandler(
client,
name,
self.machineInfoFactory,
self.fsInfo,
*dockerRootDir,
self.usesAufsDriver,
&self.cgroupSubsystems,
)
return
}
// Returns the Docker ID from the full container name.
func ContainerNameToDockerId(name string) string {
id := path.Base(name)
// Turn systemd cgroup name into Docker ID.
if useSystemd {
id = strings.TrimPrefix(id, "docker-")
id = strings.TrimSuffix(id, ".scope")
}
return id
}
// Returns a full container name for the specified Docker ID.
func FullContainerName(dockerId string) string {
// Add the full container name.
if useSystemd {
return path.Join("/system.slice", fmt.Sprintf("docker-%s.scope", dockerId))
} else {
return path.Join("/docker", dockerId)
}
}
// Docker handles all containers under /docker
func (self *dockerFactory) CanHandle(name string) (bool, error) {
// Check if the container is known to docker and it is active.
id := ContainerNameToDockerId(name)
// We assume that if Inspect fails then the container is not known to docker.
ctnr, err := self.client.InspectContainer(id)
if err != nil || !ctnr.State.Running {
return false, fmt.Errorf("error inspecting container: %v", err)
}
return true, nil
}
func parseDockerVersion(full_version_string string) ([]int, error) {
version_regexp_string := "(\\d+)\\.(\\d+)\\.(\\d+)"
version_re := regexp.MustCompile(version_regexp_string)
matches := version_re.FindAllStringSubmatch(full_version_string, -1)
if len(matches) != 1 {
return nil, fmt.Errorf("version string \"%v\" doesn't match expected regular expression: \"%v\"", full_version_string, version_regexp_string)
}
version_string_array := matches[0][1:]
version_array := make([]int, 3)
for index, version_string := range version_string_array {
version, err := strconv.Atoi(version_string)
if err != nil {
return nil, fmt.Errorf("error while parsing \"%v\" in \"%v\"", version_string, full_version_string)
}
version_array[index] = version
}
return version_array, nil
}
// Register root container before running this function!
func Register(factory info.MachineInfoFactory, fsInfo fs.FsInfo) error {
client, err := docker.NewClient(*ArgDockerEndpoint)
if err != nil {
return fmt.Errorf("unable to communicate with docker daemon: %v", err)
}
if version, err := client.Version(); err != nil {
return fmt.Errorf("unable to communicate with docker daemon: %v", err)
} else {
expected_version := []int{1, 0, 0}
version_string := version.Get("Version")
version, err := parseDockerVersion(version_string)
if err != nil {
return fmt.Errorf("couldn't parse docker version: %v", err)
}
for index, number := range version {
if number > expected_version[index] {
break
} else if number < expected_version[index] {
return fmt.Errorf("cAdvisor requires docker version %v or above but we have found version %v reported as \"%v\"", expected_version, version, version_string)
}
}
}
// Check that the libcontainer execdriver is used.
information, err := client.Info()
if err != nil {
return fmt.Errorf("failed to detect Docker info: %v", err)
}
usesNativeDriver := false
for _, val := range *information {
if strings.Contains(val, "ExecutionDriver=") && strings.Contains(val, "native") {
usesNativeDriver = true
break
}
}
if !usesNativeDriver {
return fmt.Errorf("docker found, but not using native exec driver")
}
usesAufsDriver := false
for _, val := range *information {
if strings.Contains(val, "Driver=") && strings.Contains(val, "aufs") {
usesAufsDriver = true
break
}
}
if useSystemd {
glog.Infof("System is using systemd")
}
cgroupSubsystems, err := libcontainer.GetCgroupSubsystems()
if err != nil {
return fmt.Errorf("failed to get cgroup subsystems: %v", err)
}
glog.Infof("Registering Docker factory")
f := &dockerFactory{
machineInfoFactory: factory,
client: client,
usesAufsDriver: usesAufsDriver,
cgroupSubsystems: cgroupSubsystems,
fsInfo: fsInfo,
}
container.RegisterContainerHandlerFactory(f)
return nil
}