package daemon import ( "fmt" "github.com/docker/docker/engine" "github.com/docker/docker/graph" "github.com/docker/docker/image" "github.com/docker/docker/pkg/parsers" "github.com/docker/docker/runconfig" "github.com/docker/libcontainer/label" ) func (daemon *Daemon) ContainerCreate(job *engine.Job) engine.Status { var name string if len(job.Args) == 1 { name = job.Args[0] } else if len(job.Args) > 1 { return job.Errorf("Usage: %s", job.Name) } config := runconfig.ContainerConfigFromJob(job) if config.Memory != 0 && config.Memory < 4194304 { return job.Errorf("Minimum memory limit allowed is 4MB") } if config.Memory > 0 && !daemon.SystemConfig().MemoryLimit { job.Errorf("Your kernel does not support memory limit capabilities. Limitation discarded.\n") config.Memory = 0 } if config.Memory > 0 && !daemon.SystemConfig().SwapLimit { job.Errorf("Your kernel does not support swap limit capabilities. Limitation discarded.\n") config.MemorySwap = -1 } if config.Memory > 0 && config.MemorySwap > 0 && config.MemorySwap < config.Memory { return job.Errorf("Minimum memoryswap limit should be larger than memory limit, see usage.\n") } if config.Memory == 0 && config.MemorySwap > 0 { return job.Errorf("You should always set the Memory limit when using Memoryswap limit, see usage.\n") } var hostConfig *runconfig.HostConfig if job.EnvExists("HostConfig") { hostConfig = runconfig.ContainerHostConfigFromJob(job) } else { // Older versions of the API don't provide a HostConfig. hostConfig = nil } container, buildWarnings, err := daemon.Create(config, hostConfig, name) if err != nil { if daemon.Graph().IsNotExist(err) { _, tag := parsers.ParseRepositoryTag(config.Image) if tag == "" { tag = graph.DEFAULTTAG } return job.Errorf("No such image: %s (tag: %s)", config.Image, tag) } return job.Error(err) } if !container.Config.NetworkDisabled && daemon.SystemConfig().IPv4ForwardingDisabled { job.Errorf("IPv4 forwarding is disabled.\n") } container.LogEvent("create") job.Printf("%s\n", container.ID) for _, warning := range buildWarnings { job.Errorf("%s\n", warning) } return engine.StatusOK } // Create creates a new container from the given configuration with a given name. func (daemon *Daemon) Create(config *runconfig.Config, hostConfig *runconfig.HostConfig, name string) (*Container, []string, error) { var ( container *Container warnings []string img *image.Image imgID string err error ) if config.Image != "" { img, err = daemon.repositories.LookupImage(config.Image) if err != nil { return nil, nil, err } if err = img.CheckDepth(); err != nil { return nil, nil, err } imgID = img.ID } if warnings, err = daemon.mergeAndVerifyConfig(config, img); err != nil { return nil, nil, err } if hostConfig == nil { hostConfig = &runconfig.HostConfig{} } if hostConfig.SecurityOpt == nil { hostConfig.SecurityOpt, err = daemon.GenerateSecurityOpt(hostConfig.IpcMode, hostConfig.PidMode) if err != nil { return nil, nil, err } } if container, err = daemon.newContainer(name, config, imgID); err != nil { return nil, nil, err } if err := daemon.Register(container); err != nil { return nil, nil, err } if err := daemon.createRootfs(container); err != nil { return nil, nil, err } if hostConfig != nil { if err := daemon.setHostConfig(container, hostConfig); err != nil { return nil, nil, err } } if err := container.Mount(); err != nil { return nil, nil, err } defer container.Unmount() if err := container.prepareVolumes(); err != nil { return nil, nil, err } if err := container.ToDisk(); err != nil { return nil, nil, err } return container, warnings, nil } func (daemon *Daemon) GenerateSecurityOpt(ipcMode runconfig.IpcMode, pidMode runconfig.PidMode) ([]string, error) { if ipcMode.IsHost() || pidMode.IsHost() { return label.DisableSecOpt(), nil } if ipcContainer := ipcMode.Container(); ipcContainer != "" { c, err := daemon.Get(ipcContainer) if err != nil { return nil, err } if !c.IsRunning() { return nil, fmt.Errorf("cannot join IPC of a non running container: %s", ipcContainer) } return label.DupSecOpt(c.ProcessLabel), nil } return nil, nil }