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moby--moby/daemon/start.go
Fabio Kung 66b231d598 delete unused code (daemon.Start)
Signed-off-by: Fabio Kung <fabio.kung@gmail.com>
2017-06-23 07:52:34 -07:00

225 lines
7.5 KiB
Go

package daemon
import (
"fmt"
"net/http"
"runtime"
"strings"
"syscall"
"time"
"google.golang.org/grpc"
"github.com/Sirupsen/logrus"
apierrors "github.com/docker/docker/api/errors"
"github.com/docker/docker/api/types"
containertypes "github.com/docker/docker/api/types/container"
"github.com/docker/docker/container"
)
// ContainerStart starts a container.
func (daemon *Daemon) ContainerStart(name string, hostConfig *containertypes.HostConfig, checkpoint string, checkpointDir string) error {
if checkpoint != "" && !daemon.HasExperimental() {
return apierrors.NewBadRequestError(fmt.Errorf("checkpoint is only supported in experimental mode"))
}
container, err := daemon.GetContainer(name)
if err != nil {
return err
}
if container.IsPaused() {
return fmt.Errorf("Cannot start a paused container, try unpause instead.")
}
if container.IsRunning() {
err := fmt.Errorf("Container already started")
return apierrors.NewErrorWithStatusCode(err, http.StatusNotModified)
}
// Windows does not have the backwards compatibility issue here.
if runtime.GOOS != "windows" {
// This is kept for backward compatibility - hostconfig should be passed when
// creating a container, not during start.
if hostConfig != nil {
logrus.Warn("DEPRECATED: Setting host configuration options when the container starts is deprecated and has been removed in Docker 1.12")
oldNetworkMode := container.HostConfig.NetworkMode
if err := daemon.setSecurityOptions(container, hostConfig); err != nil {
return err
}
if err := daemon.mergeAndVerifyLogConfig(&hostConfig.LogConfig); err != nil {
return err
}
if err := daemon.setHostConfig(container, hostConfig); err != nil {
return err
}
newNetworkMode := container.HostConfig.NetworkMode
if string(oldNetworkMode) != string(newNetworkMode) {
// if user has change the network mode on starting, clean up the
// old networks. It is a deprecated feature and has been removed in Docker 1.12
container.NetworkSettings.Networks = nil
if err := container.CheckpointTo(daemon.containersReplica); err != nil {
return err
}
}
container.InitDNSHostConfig()
}
} else {
if hostConfig != nil {
return fmt.Errorf("Supplying a hostconfig on start is not supported. It should be supplied on create")
}
}
// check if hostConfig is in line with the current system settings.
// It may happen cgroups are umounted or the like.
if _, err = daemon.verifyContainerSettings(container.HostConfig, nil, false); err != nil {
return err
}
// Adapt for old containers in case we have updates in this function and
// old containers never have chance to call the new function in create stage.
if hostConfig != nil {
if err := daemon.adaptContainerSettings(container.HostConfig, false); err != nil {
return err
}
}
return daemon.containerStart(container, checkpoint, checkpointDir, true)
}
// containerStart prepares the container to run by setting up everything the
// container needs, such as storage and networking, as well as links
// between containers. The container is left waiting for a signal to
// begin running.
func (daemon *Daemon) containerStart(container *container.Container, checkpoint string, checkpointDir string, resetRestartManager bool) (err error) {
start := time.Now()
container.Lock()
defer container.Unlock()
if resetRestartManager && container.Running { // skip this check if already in restarting step and resetRestartManager==false
return nil
}
if container.RemovalInProgress || container.Dead {
return fmt.Errorf("Container is marked for removal and cannot be started.")
}
// if we encounter an error during start we need to ensure that any other
// setup has been cleaned up properly
defer func() {
if err != nil {
container.SetError(err)
// if no one else has set it, make sure we don't leave it at zero
if container.ExitCode() == 0 {
container.SetExitCode(128)
}
if err := container.CheckpointTo(daemon.containersReplica); err != nil {
logrus.Errorf("%s: failed saving state on start failure: %v", container.ID, err)
}
container.Reset(false)
daemon.Cleanup(container)
// if containers AutoRemove flag is set, remove it after clean up
if container.HostConfig.AutoRemove {
container.Unlock()
if err := daemon.ContainerRm(container.ID, &types.ContainerRmConfig{ForceRemove: true, RemoveVolume: true}); err != nil {
logrus.Errorf("can't remove container %s: %v", container.ID, err)
}
container.Lock()
}
}
}()
if err := daemon.conditionalMountOnStart(container); err != nil {
return err
}
if err := daemon.initializeNetworking(container); err != nil {
return err
}
spec, err := daemon.createSpec(container)
if err != nil {
return err
}
createOptions, err := daemon.getLibcontainerdCreateOptions(container)
if err != nil {
return err
}
if resetRestartManager {
container.ResetRestartManager(true)
}
if checkpointDir == "" {
checkpointDir = container.CheckpointDir()
}
if daemon.saveApparmorConfig(container); err != nil {
return err
}
if err := daemon.containerd.Create(container.ID, checkpoint, checkpointDir, *spec, container.InitializeStdio, createOptions...); err != nil {
errDesc := grpc.ErrorDesc(err)
contains := func(s1, s2 string) bool {
return strings.Contains(strings.ToLower(s1), s2)
}
logrus.Errorf("Create container failed with error: %s", errDesc)
// if we receive an internal error from the initial start of a container then lets
// return it instead of entering the restart loop
// set to 127 for container cmd not found/does not exist)
if contains(errDesc, container.Path) &&
(contains(errDesc, "executable file not found") ||
contains(errDesc, "no such file or directory") ||
contains(errDesc, "system cannot find the file specified")) {
container.SetExitCode(127)
}
// set to 126 for container cmd can't be invoked errors
if contains(errDesc, syscall.EACCES.Error()) {
container.SetExitCode(126)
}
// attempted to mount a file onto a directory, or a directory onto a file, maybe from user specified bind mounts
if contains(errDesc, syscall.ENOTDIR.Error()) {
errDesc += ": Are you trying to mount a directory onto a file (or vice-versa)? Check if the specified host path exists and is the expected type"
container.SetExitCode(127)
}
return fmt.Errorf("%s", errDesc)
}
containerActions.WithValues("start").UpdateSince(start)
return nil
}
// Cleanup releases any network resources allocated to the container along with any rules
// around how containers are linked together. It also unmounts the container's root filesystem.
func (daemon *Daemon) Cleanup(container *container.Container) {
daemon.releaseNetwork(container)
container.UnmountIpcMounts(detachMounted)
if err := daemon.conditionalUnmountOnCleanup(container); err != nil {
// FIXME: remove once reference counting for graphdrivers has been refactored
// Ensure that all the mounts are gone
if mountid, err := daemon.stores[container.Platform].layerStore.GetMountID(container.ID); err == nil {
daemon.cleanupMountsByID(mountid)
}
}
if err := container.UnmountSecrets(); err != nil {
logrus.Warnf("%s cleanup: failed to unmount secrets: %s", container.ID, err)
}
for _, eConfig := range container.ExecCommands.Commands() {
daemon.unregisterExecCommand(container, eConfig)
}
if container.BaseFS != "" {
if err := container.UnmountVolumes(daemon.LogVolumeEvent); err != nil {
logrus.Warnf("%s cleanup: Failed to umount volumes: %v", container.ID, err)
}
}
container.CancelAttachContext()
}