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moby--moby/daemon/start.go
Lei Jitang cb5b8767b6 Cleanup: remove redundant period
Signed-off-by: Lei Jitang <leijitang@huawei.com>
2016-03-24 08:26:04 -04:00

181 lines
6 KiB
Go

package daemon
import (
"fmt"
"net/http"
"runtime"
"strings"
"syscall"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/container"
"github.com/docker/docker/errors"
"github.com/docker/docker/libcontainerd"
"github.com/docker/docker/runconfig"
containertypes "github.com/docker/engine-api/types/container"
)
// ContainerStart starts a container.
func (daemon *Daemon) ContainerStart(name string, hostConfig *containertypes.HostConfig) error {
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 errors.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 will be removed in Docker 1.12")
oldNetworkMode := container.HostConfig.NetworkMode
if err := daemon.setSecurityOptions(container, hostConfig); 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 will be removed in Docker 1.12
container.NetworkSettings.Networks = nil
if err := container.ToDisk(); 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 err := daemon.adaptContainerSettings(container.HostConfig, false); err != nil {
return err
}
return daemon.containerStart(container)
}
// Start starts a container
func (daemon *Daemon) Start(container *container.Container) error {
return daemon.containerStart(container)
}
// 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) (err error) {
container.Lock()
defer container.Unlock()
if container.Running {
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.ExitCode = 128
}
container.ToDisk()
daemon.Cleanup(container)
attributes := map[string]string{
"exitCode": fmt.Sprintf("%d", container.ExitCode),
}
daemon.LogContainerEventWithAttributes(container, "die", attributes)
}
}()
if err := daemon.conditionalMountOnStart(container); err != nil {
return err
}
// Make sure NetworkMode has an acceptable value. We do this to ensure
// backwards API compatibility.
container.HostConfig = runconfig.SetDefaultNetModeIfBlank(container.HostConfig)
if err := daemon.initializeNetworking(container); err != nil {
return err
}
spec, err := daemon.createSpec(container)
if err != nil {
return err
}
defer daemon.LogContainerEvent(container, "start") // this is logged even on error
if err := daemon.containerd.Create(container.ID, *spec, libcontainerd.WithRestartManager(container.RestartManager(true))); err != nil {
// 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 strings.Contains(err.Error(), "executable file not found") ||
strings.Contains(err.Error(), "no such file or directory") ||
strings.Contains(err.Error(), "system cannot find the file specified") {
container.ExitCode = 127
err = fmt.Errorf("Container command '%s' not found or does not exist", container.Path)
}
// set to 126 for container cmd can't be invoked errors
if strings.Contains(err.Error(), syscall.EACCES.Error()) {
container.ExitCode = 126
err = fmt.Errorf("Container command '%s' could not be invoked", container.Path)
}
container.Reset(false)
return err
}
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.layerStore.GetMountID(container.ID); err == nil {
daemon.cleanupMountsByID(mountid)
}
}
for _, eConfig := range container.ExecCommands.Commands() {
daemon.unregisterExecCommand(container, eConfig)
}
if err := container.UnmountVolumes(false, daemon.LogVolumeEvent); err != nil {
logrus.Warnf("%s cleanup: Failed to umount volumes: %v", container.ID, err)
}
container.CancelAttachContext()
}