package daemon
import (
"fmt"
"io"
"io/ioutil"
"log"
"os"
"path"
"regexp"
"strings"
"sync"
"time"
"github.com/docker/libcontainer/label"
"github.com/docker/libcontainer/selinux"
"github.com/dotcloud/docker/archive"
"github.com/dotcloud/docker/daemon/execdriver"
"github.com/dotcloud/docker/daemon/execdriver/execdrivers"
"github.com/dotcloud/docker/daemon/execdriver/lxc"
"github.com/dotcloud/docker/daemon/graphdriver"
_ "github.com/dotcloud/docker/daemon/graphdriver/vfs"
_ "github.com/dotcloud/docker/daemon/networkdriver/bridge"
"github.com/dotcloud/docker/daemon/networkdriver/portallocator"
"github.com/dotcloud/docker/daemonconfig"
"github.com/dotcloud/docker/dockerversion"
"github.com/dotcloud/docker/engine"
"github.com/dotcloud/docker/graph"
"github.com/dotcloud/docker/image"
"github.com/dotcloud/docker/pkg/graphdb"
"github.com/dotcloud/docker/pkg/namesgenerator"
"github.com/dotcloud/docker/pkg/networkfs/resolvconf"
"github.com/dotcloud/docker/pkg/sysinfo"
"github.com/dotcloud/docker/runconfig"
"github.com/dotcloud/docker/utils"
)
// Set the max depth to the aufs default that most
// kernels are compiled with
// For more information see: http://sourceforge.net/p/aufs/aufs3-standalone/ci/aufs3.12/tree/config.mk
const MaxImageDepth = 127
var (
DefaultDns = []string{"8.8.8.8", "8.8.4.4"}
validContainerNameChars = `[a-zA-Z0-9_.-]`
validContainerNamePattern = regexp.MustCompile(`^/?` + validContainerNameChars + `+$`)
)
type contStore struct {
s map[string]*Container
sync.Mutex
}
func (c *contStore) Add(id string, cont *Container) {
c.Lock()
c.s[id] = cont
c.Unlock()
}
func (c *contStore) Get(id string) *Container {
c.Lock()
res := c.s[id]
c.Unlock()
return res
}
func (c *contStore) Delete(id string) {
c.Lock()
delete(c.s, id)
c.Unlock()
}
func (c *contStore) List() []*Container {
containers := new(History)
c.Lock()
for _, cont := range c.s {
containers.Add(cont)
}
c.Unlock()
containers.Sort()
return *containers
}
type Daemon struct {
repository string
sysInitPath string
containers *contStore
graph *graph.Graph
repositories *graph.TagStore
idIndex *utils.TruncIndex
sysInfo *sysinfo.SysInfo
volumes *graph.Graph
srv Server
eng *engine.Engine
config *daemonconfig.Config
containerGraph *graphdb.Database
driver graphdriver.Driver
execDriver execdriver.Driver
}
// Install installs daemon capabilities to eng.
func (daemon *Daemon) Install(eng *engine.Engine) error {
return eng.Register("container_inspect", daemon.ContainerInspect)
}
// List returns an array of all containers registered in the daemon.
func (daemon *Daemon) List() []*Container {
return daemon.containers.List()
}
// Get looks for a container by the specified ID or name, and returns it.
// If the container is not found, or if an error occurs, nil is returned.
func (daemon *Daemon) Get(name string) *Container {
if c, _ := daemon.GetByName(name); c != nil {
return c
}
id, err := daemon.idIndex.Get(name)
if err != nil {
return nil
}
return daemon.containers.Get(id)
}
// Exists returns a true if a container of the specified ID or name exists,
// false otherwise.
func (daemon *Daemon) Exists(id string) bool {
return daemon.Get(id) != nil
}
func (daemon *Daemon) containerRoot(id string) string {
return path.Join(daemon.repository, id)
}
// Load reads the contents of a container from disk
// This is typically done at startup.
func (daemon *Daemon) load(id string) (*Container, error) {
container := &Container{root: daemon.containerRoot(id)}
if err := container.FromDisk(); err != nil {
return nil, err
}
if container.ID != id {
return container, fmt.Errorf("Container %s is stored at %s", container.ID, id)
}
return container, nil
}
// Register makes a container object usable by the daemon as <container.ID>
// This is a wrapper for register
func (daemon *Daemon) Register(container *Container) error {
return daemon.register(container, true, nil)
}
// register makes a container object usable by the daemon as <container.ID>
func (daemon *Daemon) register(container *Container, updateSuffixarray bool, containersToStart *[]*Container) error {
if container.daemon != nil || daemon.Exists(container.ID) {
return fmt.Errorf("Container is already loaded")
}
if err := validateID(container.ID); err != nil {
return err
}
if err := daemon.ensureName(container); err != nil {
return err
}
container.daemon = daemon
// Attach to stdout and stderr
container.stderr = utils.NewWriteBroadcaster()
container.stdout = utils.NewWriteBroadcaster()
// Attach to stdin
if container.Config.OpenStdin {
container.stdin, container.stdinPipe = io.Pipe()
} else {
container.stdinPipe = utils.NopWriteCloser(ioutil.Discard) // Silently drop stdin
}
// done
daemon.containers.Add(container.ID, container)
// don't update the Suffixarray if we're starting up
// we'll waste time if we update it for every container
if updateSuffixarray {
daemon.idIndex.Add(container.ID)
} else {
daemon.idIndex.AddWithoutSuffixarrayUpdate(container.ID)
}
// FIXME: if the container is supposed to be running but is not, auto restart it?
// if so, then we need to restart monitor and init a new lock
// If the container is supposed to be running, make sure of it
if container.State.IsRunning() {
utils.Debugf("killing old running container %s", container.ID)
existingPid := container.State.Pid
container.State.SetStopped(0)
// We only have to handle this for lxc because the other drivers will ensure that
// no processes are left when docker dies
if container.ExecDriver == "" || strings.Contains(container.ExecDriver, "lxc") {
lxc.KillLxc(container.ID, 9)
} else {
// use the current driver and ensure that the container is dead x.x
cmd := &execdriver.Command{
ID: container.ID,
}
var err error
cmd.Process, err = os.FindProcess(existingPid)
if err != nil {
utils.Debugf("cannot find existing process for %d", existingPid)
}
daemon.execDriver.Terminate(cmd)
}
if err := container.Unmount(); err != nil {
utils.Debugf("unmount error %s", err)
}
if err := container.ToDisk(); err != nil {
utils.Debugf("saving stopped state to disk %s", err)
}
info := daemon.execDriver.Info(container.ID)
if !info.IsRunning() {
utils.Debugf("Container %s was supposed to be running but is not.", container.ID)
if daemon.config.AutoRestart {
utils.Debugf("Marking as restarting")
if err := container.Unmount(); err != nil {
utils.Debugf("restart unmount error %s", err)
}
if containersToStart != nil {
*containersToStart = append(*containersToStart, container)
}
} else {
utils.Debugf("Marking as stopped")
container.State.SetStopped(-127)
if err := container.ToDisk(); err != nil {
return err
}
}
}
} else {
// When the container is not running, we still initialize the waitLock
// chan and close it. Receiving on nil chan blocks whereas receiving on a
// closed chan does not. In this case we do not want to block.
container.waitLock = make(chan struct{})
close(container.waitLock)
}
return nil
}
func (daemon *Daemon) ensureName(container *Container) error {
if container.Name == "" {
name, err := daemon.generateNewName(container.ID)
if err != nil {
return err
}
container.Name = name
if err := container.ToDisk(); err != nil {
utils.Debugf("Error saving container name %s", err)
}
}
return nil
}
func (daemon *Daemon) LogToDisk(src *utils.WriteBroadcaster, dst, stream string) error {
log, err := os.OpenFile(dst, os.O_RDWR|os.O_APPEND|os.O_CREATE, 0600)
if err != nil {
return err
}
src.AddWriter(log, stream)
return nil
}
// Destroy unregisters a container from the daemon and cleanly removes its contents from the filesystem.
func (daemon *Daemon) Destroy(container *Container) error {
if container == nil {
return fmt.Errorf("The given container is <nil>")
}
element := daemon.containers.Get(container.ID)
if element == nil {
return fmt.Errorf("Container %v not found - maybe it was already destroyed?", container.ID)
}
if err := container.Stop(3); err != nil {
return err
}
// Deregister the container before removing its directory, to avoid race conditions
daemon.idIndex.Delete(container.ID)
daemon.containers.Delete(container.ID)
if _, err := daemon.containerGraph.Purge(container.ID); err != nil {
utils.Debugf("Unable to remove container from link graph: %s", err)
}
if err := daemon.driver.Remove(container.ID); err != nil {
return fmt.Errorf("Driver %s failed to remove root filesystem %s: %s", daemon.driver, container.ID, err)
}
initID := fmt.Sprintf("%s-init", container.ID)
if err := daemon.driver.Remove(initID); err != nil {
return fmt.Errorf("Driver %s failed to remove init filesystem %s: %s", daemon.driver, initID, err)
}
if err := os.RemoveAll(container.root); err != nil {
return fmt.Errorf("Unable to remove filesystem for %v: %v", container.ID, err)
}
selinux.FreeLxcContexts(container.ProcessLabel)
return nil
}
func (daemon *Daemon) restore() error {
var (
debug = (os.Getenv("DEBUG") != "" || os.Getenv("TEST") != "")
containers = make(map[string]*Container)
currentDriver = daemon.driver.String()
containersToStart = []*Container{}
)
if !debug {
fmt.Printf("Loading containers: ")
}
dir, err := ioutil.ReadDir(daemon.repository)
if err != nil {
return err
}
for _, v := range dir {
id := v.Name()
container, err := daemon.load(id)
if !debug {
fmt.Print(".")
}
if err != nil {
utils.Errorf("Failed to load container %v: %v", id, err)
continue
}
// Ignore the container if it does not support the current driver being used by the graph
if container.Driver == "" && currentDriver == "aufs" || container.Driver == currentDriver {
utils.Debugf("Loaded container %v", container.ID)
containers[container.ID] = container
} else {
utils.Debugf("Cannot load container %s because it was created with another graph driver.", container.ID)
}
}
if entities := daemon.containerGraph.List("/", -1); entities != nil {
for _, p := range entities.Paths() {
if !debug {
fmt.Print(".")
}
e := entities[p]
if container, ok := containers[e.ID()]; ok {
if err := daemon.register(container, false, &containersToStart); err != nil {
utils.Debugf("Failed to register container %s: %s", container.ID, err)
}
delete(containers, e.ID())
}
}
}
// Any containers that are left over do not exist in the graph
for _, container := range containers {
// Try to set the default name for a container if it exists prior to links
container.Name, err = daemon.generateNewName(container.ID)
if err != nil {
utils.Debugf("Setting default id - %s", err)
}
if err := daemon.register(container, false, &containersToStart); err != nil {
utils.Debugf("Failed to register container %s: %s", container.ID, err)
}
}
daemon.idIndex.UpdateSuffixarray()
for _, container := range containersToStart {
utils.Debugf("Starting container %d", container.ID)
if err := container.Start(); err != nil {
utils.Debugf("Failed to start container %s: %s", container.ID, err)
}
}
if !debug {
fmt.Printf(": done.\n")
}
return nil
}
// Create creates a new container from the given configuration with a given name.
func (daemon *Daemon) Create(config *runconfig.Config, name string) (*Container, []string, error) {
var (
container *Container
warnings []string
)
img, err := daemon.repositories.LookupImage(config.Image)
if err != nil {
return nil, nil, err
}
if err := daemon.checkImageDepth(img); err != nil {
return nil, nil, err
}
if warnings, err = daemon.mergeAndVerifyConfig(config, img); err != nil {
return nil, nil, err
}
if container, err = daemon.newContainer(name, config, img); err != nil {
return nil, nil, err
}
if err := daemon.createRootfs(container, img); err != nil {
return nil, nil, err
}
if err := container.ToDisk(); err != nil {
return nil, nil, err
}
if err := daemon.Register(container); err != nil {
return nil, nil, err
}
return container, warnings, nil
}
func (daemon *Daemon) checkImageDepth(img *image.Image) error {
// We add 2 layers to the depth because the container's rw and
// init layer add to the restriction
depth, err := img.Depth()
if err != nil {
return err
}
if depth+2 >= MaxImageDepth {
return fmt.Errorf("Cannot create container with more than %d parents", MaxImageDepth)
}
return nil
}
func (daemon *Daemon) checkDeprecatedExpose(config *runconfig.Config) bool {
if config != nil {
if config.PortSpecs != nil {
for _, p := range config.PortSpecs {
if strings.Contains(p, ":") {
return true
}
}
}
}
return false
}
func (daemon *Daemon) mergeAndVerifyConfig(config *runconfig.Config, img *image.Image) ([]string, error) {
warnings := []string{}
if daemon.checkDeprecatedExpose(img.Config) || daemon.checkDeprecatedExpose(config) {
warnings = append(warnings, "The mapping to public ports on your host via Dockerfile EXPOSE (host:port:port) has been deprecated. Use -p to publish the ports.")
}
if img.Config != nil {
if err := runconfig.Merge(config, img.Config); err != nil {
return nil, err
}
}
if len(config.Entrypoint) == 0 && len(config.Cmd) == 0 {
return nil, fmt.Errorf("No command specified")
}
return warnings, nil
}
func (daemon *Daemon) generateIdAndName(name string) (string, string, error) {
var (
err error
id = utils.GenerateRandomID()
)
if name == "" {
if name, err = daemon.generateNewName(id); err != nil {
return "", "", err
}
return id, name, nil
}
if name, err = daemon.reserveName(id, name); err != nil {
return "", "", err
}
return id, name, nil
}
func (daemon *Daemon) reserveName(id, name string) (string, error) {
if !validContainerNamePattern.MatchString(name) {
return "", fmt.Errorf("Invalid container name (%s), only %s are allowed", name, validContainerNameChars)
}
if name[0] != '/' {
name = "/" + name
}
if _, err := daemon.containerGraph.Set(name, id); err != nil {
if !graphdb.IsNonUniqueNameError(err) {
return "", err
}
conflictingContainer, err := daemon.GetByName(name)
if err != nil {
if strings.Contains(err.Error(), "Could not find entity") {
return "", err
}
// Remove name and continue starting the container
if err := daemon.containerGraph.Delete(name); err != nil {
return "", err
}
} else {
nameAsKnownByUser := strings.TrimPrefix(name, "/")
return "", fmt.Errorf(
"Conflict, The name %s is already assigned to %s. You have to delete (or rename) that container to be able to assign %s to a container again.", nameAsKnownByUser,
utils.TruncateID(conflictingContainer.ID), nameAsKnownByUser)
}
}
return name, nil
}
func (daemon *Daemon) generateNewName(id string) (string, error) {
var name string
for i := 0; i < 6; i++ {
name = namesgenerator.GetRandomName(i)
if name[0] != '/' {
name = "/" + name
}
if _, err := daemon.containerGraph.Set(name, id); err != nil {
if !graphdb.IsNonUniqueNameError(err) {
return "", err
}
continue
}
return name, nil
}
name = "/" + utils.TruncateID(id)
if _, err := daemon.containerGraph.Set(name, id); err != nil {
return "", err
}
return name, nil
}
func (daemon *Daemon) generateHostname(id string, config *runconfig.Config) {
// Generate default hostname
// FIXME: the lxc template no longer needs to set a default hostname
if config.Hostname == "" {
config.Hostname = id[:12]
}
}
func (daemon *Daemon) getEntrypointAndArgs(config *runconfig.Config) (string, []string) {
var (
entrypoint string
args []string
)
if len(config.Entrypoint) != 0 {
entrypoint = config.Entrypoint[0]
args = append(config.Entrypoint[1:], config.Cmd...)
} else {
entrypoint = config.Cmd[0]
args = config.Cmd[1:]
}
return entrypoint, args
}
func (daemon *Daemon) newContainer(name string, config *runconfig.Config, img *image.Image) (*Container, error) {
var (
id string
err error
)
id, name, err = daemon.generateIdAndName(name)
if err != nil {
return nil, err
}
daemon.generateHostname(id, config)
entrypoint, args := daemon.getEntrypointAndArgs(config)
container := &Container{
// FIXME: we should generate the ID here instead of receiving it as an argument
ID: id,
Created: time.Now().UTC(),
Path: entrypoint,
Args: args, //FIXME: de-duplicate from config
Config: config,
hostConfig: &runconfig.HostConfig{},
Image: img.ID, // Always use the resolved image id
NetworkSettings: &NetworkSettings{},
Name: name,
Driver: daemon.driver.String(),
ExecDriver: daemon.execDriver.Name(),
}
container.root = daemon.containerRoot(container.ID)
if container.ProcessLabel, container.MountLabel, err = label.GenLabels(""); err != nil {
return nil, err
}
return container, nil
}
func (daemon *Daemon) createRootfs(container *Container, img *image.Image) error {
// Step 1: create the container directory.
// This doubles as a barrier to avoid race conditions.
if err := os.Mkdir(container.root, 0700); err != nil {
return err
}
initID := fmt.Sprintf("%s-init", container.ID)
if err := daemon.driver.Create(initID, img.ID); err != nil {
return err
}
initPath, err := daemon.driver.Get(initID, "")
if err != nil {
return err
}
defer daemon.driver.Put(initID)
if err := graph.SetupInitLayer(initPath); err != nil {
return err
}
if err := daemon.driver.Create(container.ID, initID); err != nil {
return err
}
return nil
}
// Commit creates a new filesystem image from the current state of a container.
// The image can optionally be tagged into a repository
func (daemon *Daemon) Commit(container *Container, repository, tag, comment, author string, config *runconfig.Config) (*image.Image, error) {
// FIXME: freeze the container before copying it to avoid data corruption?
if err := container.Mount(); err != nil {
return nil, err
}
defer container.Unmount()
rwTar, err := container.ExportRw()
if err != nil {
return nil, err
}
defer rwTar.Close()
// Create a new image from the container's base layers + a new layer from container changes
var (
containerID, containerImage string
containerConfig *runconfig.Config
)
if container != nil {
containerID = container.ID
containerImage = container.Image
containerConfig = container.Config
}
img, err := daemon.graph.Create(rwTar, containerID, containerImage, comment, author, containerConfig, config)
if err != nil {
return nil, err
}
// Register the image if needed
if repository != "" {
if err := daemon.repositories.Set(repository, tag, img.ID, true); err != nil {
return img, err
}
}
return img, nil
}
func GetFullContainerName(name string) (string, error) {
if name == "" {
return "", fmt.Errorf("Container name cannot be empty")
}
if name[0] != '/' {
name = "/" + name
}
return name, nil
}
func (daemon *Daemon) GetByName(name string) (*Container, error) {
fullName, err := GetFullContainerName(name)
if err != nil {
return nil, err
}
entity := daemon.containerGraph.Get(fullName)
if entity == nil {
return nil, fmt.Errorf("Could not find entity for %s", name)
}
e := daemon.containers.Get(entity.ID())
if e == nil {
return nil, fmt.Errorf("Could not find container for entity id %s", entity.ID())
}
return e, nil
}
func (daemon *Daemon) Children(name string) (map[string]*Container, error) {
name, err := GetFullContainerName(name)
if err != nil {
return nil, err
}
children := make(map[string]*Container)
err = daemon.containerGraph.Walk(name, func(p string, e *graphdb.Entity) error {
c := daemon.Get(e.ID())
if c == nil {
return fmt.Errorf("Could not get container for name %s and id %s", e.ID(), p)
}
children[p] = c
return nil
}, 0)
if err != nil {
return nil, err
}
return children, nil
}
func (daemon *Daemon) RegisterLink(parent, child *Container, alias string) error {
fullName := path.Join(parent.Name, alias)
if !daemon.containerGraph.Exists(fullName) {
_, err := daemon.containerGraph.Set(fullName, child.ID)
return err
}
return nil
}
func (daemon *Daemon) RegisterLinks(container *Container, hostConfig *runconfig.HostConfig) error {
if hostConfig != nil && hostConfig.Links != nil {
for _, l := range hostConfig.Links {
parts, err := utils.PartParser("name:alias", l)
if err != nil {
return err
}
child, err := daemon.GetByName(parts["name"])
if err != nil {
return err
}
if child == nil {
return fmt.Errorf("Could not get container for %s", parts["name"])
}
if err := daemon.RegisterLink(container, child, parts["alias"]); err != nil {
return err
}
}
// After we load all the links into the daemon
// set them to nil on the hostconfig
hostConfig.Links = nil
if err := container.WriteHostConfig(); err != nil {
return err
}
}
return nil
}
// FIXME: harmonize with NewGraph()
func NewDaemon(config *daemonconfig.Config, eng *engine.Engine) (*Daemon, error) {
daemon, err := NewDaemonFromDirectory(config, eng)
if err != nil {
return nil, err
}
return daemon, nil
}
func NewDaemonFromDirectory(config *daemonconfig.Config, eng *engine.Engine) (*Daemon, error) {
if !config.EnableSelinuxSupport {
selinux.SetDisabled()
}
// Create the root directory if it doesn't exists
if err := os.MkdirAll(config.Root, 0700); err != nil && !os.IsExist(err) {
return nil, err
}
// Set the default driver
graphdriver.DefaultDriver = config.GraphDriver
// Load storage driver
driver, err := graphdriver.New(config.Root, config.GraphOptions)
if err != nil {
return nil, err
}
utils.Debugf("Using graph driver %s", driver)
daemonRepo := path.Join(config.Root, "containers")
if err := os.MkdirAll(daemonRepo, 0700); err != nil && !os.IsExist(err) {
return nil, err
}
// Migrate the container if it is aufs and aufs is enabled
if err = migrateIfAufs(driver, config.Root); err != nil {
return nil, err
}
utils.Debugf("Creating images graph")
g, err := graph.NewGraph(path.Join(config.Root, "graph"), driver)
if err != nil {
return nil, err
}
// We don't want to use a complex driver like aufs or devmapper
// for volumes, just a plain filesystem
volumesDriver, err := graphdriver.GetDriver("vfs", config.Root, config.GraphOptions)
if err != nil {
return nil, err
}
utils.Debugf("Creating volumes graph")
volumes, err := graph.NewGraph(path.Join(config.Root, "volumes"), volumesDriver)
if err != nil {
return nil, err
}
utils.Debugf("Creating repository list")
repositories, err := graph.NewTagStore(path.Join(config.Root, "repositories-"+driver.String()), g)
if err != nil {
return nil, fmt.Errorf("Couldn't create Tag store: %s", err)
}
if !config.DisableNetwork {
job := eng.Job("init_networkdriver")
job.SetenvBool("EnableIptables", config.EnableIptables)
job.SetenvBool("InterContainerCommunication", config.InterContainerCommunication)
job.SetenvBool("EnableIpForward", config.EnableIpForward)
job.Setenv("BridgeIface", config.BridgeIface)
job.Setenv("BridgeIP", config.BridgeIP)
job.Setenv("DefaultBindingIP", config.DefaultIp.String())
if err := job.Run(); err != nil {
return nil, err
}
}
graphdbPath := path.Join(config.Root, "linkgraph.db")
graph, err := graphdb.NewSqliteConn(graphdbPath)
if err != nil {
return nil, err
}
localCopy := path.Join(config.Root, "init", fmt.Sprintf("dockerinit-%s", dockerversion.VERSION))
sysInitPath := utils.DockerInitPath(localCopy)
if sysInitPath == "" {
return nil, fmt.Errorf("Could not locate dockerinit: This usually means docker was built incorrectly. See http://docs.docker.io/en/latest/contributing/devenvironment for official build instructions.")
}
if sysInitPath != localCopy {
// When we find a suitable dockerinit binary (even if it's our local binary), we copy it into config.Root at localCopy for future use (so that the original can go away without that being a problem, for example during a package upgrade).
if err := os.Mkdir(path.Dir(localCopy), 0700); err != nil && !os.IsExist(err) {
return nil, err
}
if _, err := utils.CopyFile(sysInitPath, localCopy); err != nil {
return nil, err
}
if err := os.Chmod(localCopy, 0700); err != nil {
return nil, err
}
sysInitPath = localCopy
}
sysInfo := sysinfo.New(false)
ed, err := execdrivers.NewDriver(config.ExecDriver, config.Root, sysInitPath, sysInfo)
if err != nil {
return nil, err
}
daemon := &Daemon{
repository: daemonRepo,
containers: &contStore{s: make(map[string]*Container)},
graph: g,
repositories: repositories,
idIndex: utils.NewTruncIndex([]string{}),
sysInfo: sysInfo,
volumes: volumes,
config: config,
containerGraph: graph,
driver: driver,
sysInitPath: sysInitPath,
execDriver: ed,
eng: eng,
}
if err := daemon.checkLocaldns(); err != nil {
return nil, err
}
if err := daemon.restore(); err != nil {
return nil, err
}
return daemon, nil
}
func (daemon *Daemon) shutdown() error {
group := sync.WaitGroup{}
utils.Debugf("starting clean shutdown of all containers...")
for _, container := range daemon.List() {
c := container
if c.State.IsRunning() {
utils.Debugf("stopping %s", c.ID)
group.Add(1)
go func() {
defer group.Done()
if err := c.KillSig(15); err != nil {
utils.Debugf("kill 15 error for %s - %s", c.ID, err)
}
c.Wait()
utils.Debugf("container stopped %s", c.ID)
}()
}
}
group.Wait()
return nil
}
func (daemon *Daemon) Close() error {
errorsStrings := []string{}
if err := daemon.shutdown(); err != nil {
utils.Errorf("daemon.shutdown(): %s", err)
errorsStrings = append(errorsStrings, err.Error())
}
if err := portallocator.ReleaseAll(); err != nil {
utils.Errorf("portallocator.ReleaseAll(): %s", err)
errorsStrings = append(errorsStrings, err.Error())
}
if err := daemon.driver.Cleanup(); err != nil {
utils.Errorf("daemon.driver.Cleanup(): %s", err.Error())
errorsStrings = append(errorsStrings, err.Error())
}
if err := daemon.containerGraph.Close(); err != nil {
utils.Errorf("daemon.containerGraph.Close(): %s", err.Error())
errorsStrings = append(errorsStrings, err.Error())
}
if len(errorsStrings) > 0 {
return fmt.Errorf("%s", strings.Join(errorsStrings, ", "))
}
return nil
}
func (daemon *Daemon) Mount(container *Container) error {
dir, err := daemon.driver.Get(container.ID, container.GetMountLabel())
if err != nil {
return fmt.Errorf("Error getting container %s from driver %s: %s", container.ID, daemon.driver, err)
}
if container.basefs == "" {
container.basefs = dir
} else if container.basefs != dir {
return fmt.Errorf("Error: driver %s is returning inconsistent paths for container %s ('%s' then '%s')",
daemon.driver, container.ID, container.basefs, dir)
}
return nil
}
func (daemon *Daemon) Unmount(container *Container) error {
daemon.driver.Put(container.ID)
return nil
}
func (daemon *Daemon) Changes(container *Container) ([]archive.Change, error) {
if differ, ok := daemon.driver.(graphdriver.Differ); ok {
return differ.Changes(container.ID)
}
cDir, err := daemon.driver.Get(container.ID, "")
if err != nil {
return nil, fmt.Errorf("Error getting container rootfs %s from driver %s: %s", container.ID, container.daemon.driver, err)
}
defer daemon.driver.Put(container.ID)
initDir, err := daemon.driver.Get(container.ID+"-init", "")
if err != nil {
return nil, fmt.Errorf("Error getting container init rootfs %s from driver %s: %s", container.ID, container.daemon.driver, err)
}
defer daemon.driver.Put(container.ID + "-init")
return archive.ChangesDirs(cDir, initDir)
}
func (daemon *Daemon) Diff(container *Container) (archive.Archive, error) {
if differ, ok := daemon.driver.(graphdriver.Differ); ok {
return differ.Diff(container.ID)
}
changes, err := daemon.Changes(container)
if err != nil {
return nil, err
}
cDir, err := daemon.driver.Get(container.ID, "")
if err != nil {
return nil, fmt.Errorf("Error getting container rootfs %s from driver %s: %s", container.ID, container.daemon.driver, err)
}
archive, err := archive.ExportChanges(cDir, changes)
if err != nil {
return nil, err
}
return utils.NewReadCloserWrapper(archive, func() error {
err := archive.Close()
daemon.driver.Put(container.ID)
return err
}), nil
}
func (daemon *Daemon) Run(c *Container, pipes *execdriver.Pipes, startCallback execdriver.StartCallback) (int, error) {
return daemon.execDriver.Run(c.command, pipes, startCallback)
}
func (daemon *Daemon) Pause(c *Container) error {
if err := daemon.execDriver.Pause(c.command); err != nil {
return err
}
c.State.SetPaused()
return nil
}
func (daemon *Daemon) Unpause(c *Container) error {
if err := daemon.execDriver.Unpause(c.command); err != nil {
return err
}
c.State.SetUnpaused()
return nil
}
func (daemon *Daemon) Kill(c *Container, sig int) error {
return daemon.execDriver.Kill(c.command, sig)
}
// Nuke kills all containers then removes all content
// from the content root, including images, volumes and
// container filesystems.
// Again: this will remove your entire docker daemon!
func (daemon *Daemon) Nuke() error {
var wg sync.WaitGroup
for _, container := range daemon.List() {
wg.Add(1)
go func(c *Container) {
c.Kill()
wg.Done()
}(container)
}
wg.Wait()
daemon.Close()
return os.RemoveAll(daemon.config.Root)
}
// FIXME: this is a convenience function for integration tests
// which need direct access to daemon.graph.
// Once the tests switch to using engine and jobs, this method
// can go away.
func (daemon *Daemon) Graph() *graph.Graph {
return daemon.graph
}
func (daemon *Daemon) Repositories() *graph.TagStore {
return daemon.repositories
}
func (daemon *Daemon) Config() *daemonconfig.Config {
return daemon.config
}
func (daemon *Daemon) SystemConfig() *sysinfo.SysInfo {
return daemon.sysInfo
}
func (daemon *Daemon) SystemInitPath() string {
return daemon.sysInitPath
}
func (daemon *Daemon) GraphDriver() graphdriver.Driver {
return daemon.driver
}
func (daemon *Daemon) ExecutionDriver() execdriver.Driver {
return daemon.execDriver
}
func (daemon *Daemon) Volumes() *graph.Graph {
return daemon.volumes
}
func (daemon *Daemon) ContainerGraph() *graphdb.Database {
return daemon.containerGraph
}
func (daemon *Daemon) SetServer(server Server) {
daemon.srv = server
}
func (daemon *Daemon) checkLocaldns() error {
resolvConf, err := resolvconf.Get()
if err != nil {
return err
}
if len(daemon.config.Dns) == 0 && utils.CheckLocalDns(resolvConf) {
log.Printf("Local (127.0.0.1) DNS resolver found in resolv.conf and containers can't use it. Using default external servers : %v\n", DefaultDns)
daemon.config.Dns = DefaultDns
}
return nil
}