package main import ( "context" "fmt" "io" "io/ioutil" "os" "strings" "github.com/containers/image/types" "github.com/containers/libpod/cmd/podman/cliconfig" "github.com/containers/libpod/cmd/podman/libpodruntime" "github.com/containers/libpod/cmd/podman/shared" "github.com/containers/libpod/libpod" "github.com/containers/libpod/libpod/image" ns "github.com/containers/libpod/pkg/namespaces" "github.com/containers/libpod/pkg/spec" "github.com/containers/storage" "github.com/cri-o/ocicni/pkg/ocicni" "github.com/ghodss/yaml" "github.com/pkg/errors" "github.com/sirupsen/logrus" "github.com/spf13/cobra" "k8s.io/api/core/v1" ) const ( // https://kubernetes.io/docs/concepts/storage/volumes/#hostpath createDirectoryPermission = 0755 ) var ( playKubeCommand cliconfig.KubePlayValues playKubeDescription = `Command reads in a structured file of Kubernetes YAML. It creates the pod and containers described in the YAML. The containers within the pod are then started and the ID of the new Pod is output.` _playKubeCommand = &cobra.Command{ Use: "kube [flags] KUBEFILE", Short: "Play a pod based on Kubernetes YAML", Long: playKubeDescription, RunE: func(cmd *cobra.Command, args []string) error { playKubeCommand.InputArgs = args playKubeCommand.GlobalFlags = MainGlobalOpts return playKubeYAMLCmd(&playKubeCommand) }, Example: `podman play kube demo.yml podman play kube --cert-dir /mycertsdir --tls-verify=true --quiet myWebPod`, } ) func init() { playKubeCommand.Command = _playKubeCommand playKubeCommand.SetHelpTemplate(HelpTemplate()) playKubeCommand.SetUsageTemplate(UsageTemplate()) flags := playKubeCommand.Flags() flags.StringVar(&playKubeCommand.Authfile, "authfile", "", "Path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json. Use REGISTRY_AUTH_FILE environment variable to override") flags.StringVar(&playKubeCommand.CertDir, "cert-dir", "", "`Pathname` of a directory containing TLS certificates and keys") flags.StringVar(&playKubeCommand.Creds, "creds", "", "`Credentials` (USERNAME:PASSWORD) to use for authenticating to a registry") flags.BoolVarP(&playKubeCommand.Quiet, "quiet", "q", false, "Suppress output information when pulling images") flags.StringVar(&playKubeCommand.SignaturePolicy, "signature-policy", "", "`Pathname` of signature policy file (not usually used)") flags.BoolVar(&playKubeCommand.TlsVerify, "tls-verify", true, "Require HTTPS and verify certificates when contacting registries") } func playKubeYAMLCmd(c *cliconfig.KubePlayValues) error { var ( podOptions []libpod.PodCreateOption podYAML v1.Pod registryCreds *types.DockerAuthConfig containers []*libpod.Container writer io.Writer ) ctx := getContext() args := c.InputArgs if len(args) > 1 { return errors.New("you can only play one kubernetes file at a time") } if len(args) < 1 { return errors.New("you must supply at least one file") } runtime, err := libpodruntime.GetRuntime(&c.PodmanCommand) if err != nil { return errors.Wrapf(err, "could not get runtime") } defer runtime.Shutdown(false) content, err := ioutil.ReadFile(args[0]) if err != nil { return err } if err := yaml.Unmarshal(content, &podYAML); err != nil { return errors.Wrapf(err, "unable to read %s as YAML", args[0]) } // check for name collision between pod and container podName := podYAML.ObjectMeta.Name for _, n := range podYAML.Spec.Containers { if n.Name == podName { fmt.Printf("a container exists with the same name (%s) as the pod in your YAML file; changing pod name to %s_pod\n", podName, podName) podName = fmt.Sprintf("%s_pod", podName) } } podOptions = append(podOptions, libpod.WithInfraContainer()) podOptions = append(podOptions, libpod.WithPodName(podName)) // TODO for now we just used the default kernel namespaces; we need to add/subtract this from yaml nsOptions, err := shared.GetNamespaceOptions(strings.Split(shared.DefaultKernelNamespaces, ",")) if err != nil { return err } podOptions = append(podOptions, nsOptions...) podPorts := getPodPorts(podYAML.Spec.Containers) podOptions = append(podOptions, libpod.WithInfraContainerPorts(podPorts)) // Create the Pod pod, err := runtime.NewPod(ctx, podOptions...) if err != nil { return err } // Print the Pod's ID fmt.Println(pod.ID()) podInfraID, err := pod.InfraContainerID() if err != nil { return err } namespaces := map[string]string{ // Disabled during code review per mheon //"pid": fmt.Sprintf("container:%s", podInfraID), "net": fmt.Sprintf("container:%s", podInfraID), "user": fmt.Sprintf("container:%s", podInfraID), "ipc": fmt.Sprintf("container:%s", podInfraID), "uts": fmt.Sprintf("container:%s", podInfraID), } if !c.Quiet { writer = os.Stderr } dockerRegistryOptions := image.DockerRegistryOptions{ DockerRegistryCreds: registryCreds, DockerCertPath: c.CertDir, } if c.Flag("tls-verify").Changed { dockerRegistryOptions.DockerInsecureSkipTLSVerify = types.NewOptionalBool(!c.TlsVerify) } // map from name to mount point volumes := make(map[string]string) for _, volume := range podYAML.Spec.Volumes { hostPath := volume.VolumeSource.HostPath if hostPath == nil { return errors.Errorf("HostPath is currently the only supported VolumeSource") } if hostPath.Type != nil { switch *hostPath.Type { case v1.HostPathDirectoryOrCreate: if _, err := os.Stat(hostPath.Path); os.IsNotExist(err) { if err := os.Mkdir(hostPath.Path, createDirectoryPermission); err != nil { return errors.Errorf("Error creating HostPath %s at %s", volume.Name, hostPath.Path) } } // unconditionally label a newly created volume as private if err := libpod.LabelVolumePath(hostPath.Path, false); err != nil { return errors.Wrapf(err, "Error giving %s a label", hostPath.Path) } break case v1.HostPathDirectory: case v1.HostPathUnset: // do nothing here because we will verify the path exists in validateVolumeHostDir break default: return errors.Errorf("Directories are the only supported HostPath type") } } if err := shared.ValidateVolumeHostDir(hostPath.Path); err != nil { return errors.Wrapf(err, "Error in parsing HostPath in YAML") } volumes[volume.Name] = hostPath.Path } for _, container := range podYAML.Spec.Containers { newImage, err := runtime.ImageRuntime().New(ctx, container.Image, c.SignaturePolicy, c.Authfile, writer, &dockerRegistryOptions, image.SigningOptions{}, false, nil) if err != nil { return err } createConfig, err := kubeContainerToCreateConfig(ctx, container, runtime, newImage, namespaces, volumes) if err != nil { return err } ctr, err := shared.CreateContainerFromCreateConfig(runtime, createConfig, ctx, pod) if err != nil { return err } containers = append(containers, ctr) } // start the containers for _, ctr := range containers { if err := ctr.Start(ctx, true); err != nil { // Making this a hard failure here to avoid a mess // the other containers are in created status return err } fmt.Println(ctr.ID()) } return nil } // getPodPorts converts a slice of kube container descriptions to an // array of ocicni portmapping descriptions usable in libpod func getPodPorts(containers []v1.Container) []ocicni.PortMapping { var infraPorts []ocicni.PortMapping for _, container := range containers { for _, p := range container.Ports { portBinding := ocicni.PortMapping{ HostPort: p.HostPort, ContainerPort: p.ContainerPort, Protocol: strings.ToLower(string(p.Protocol)), } if p.HostIP != "" { logrus.Debug("HostIP on port bindings is not supported") } infraPorts = append(infraPorts, portBinding) } } return infraPorts } // kubeContainerToCreateConfig takes a v1.Container and returns a createconfig describing a container func kubeContainerToCreateConfig(ctx context.Context, containerYAML v1.Container, runtime *libpod.Runtime, newImage *image.Image, namespaces map[string]string, volumes map[string]string) (*createconfig.CreateConfig, error) { var ( containerConfig createconfig.CreateConfig envs map[string]string ) // The default for MemorySwappiness is -1, not 0 containerConfig.Resources.MemorySwappiness = -1 containerConfig.Runtime = runtime containerConfig.Image = containerYAML.Image containerConfig.ImageID = newImage.ID() containerConfig.Name = containerYAML.Name containerConfig.Tty = containerYAML.TTY containerConfig.WorkDir = containerYAML.WorkingDir imageData, _ := newImage.Inspect(ctx) containerConfig.User = "0" if imageData != nil { containerConfig.User = imageData.Config.User } if containerConfig.SecurityOpts != nil { if containerYAML.SecurityContext.ReadOnlyRootFilesystem != nil { containerConfig.ReadOnlyRootfs = *containerYAML.SecurityContext.ReadOnlyRootFilesystem } if containerYAML.SecurityContext.Privileged != nil { containerConfig.Privileged = *containerYAML.SecurityContext.Privileged } if containerYAML.SecurityContext.AllowPrivilegeEscalation != nil { containerConfig.NoNewPrivs = !*containerYAML.SecurityContext.AllowPrivilegeEscalation } } containerConfig.Command = []string{} if imageData != nil && imageData.Config != nil { containerConfig.Command = append(containerConfig.Command, imageData.Config.Entrypoint...) } if len(containerConfig.Command) != 0 { containerConfig.Command = append(containerConfig.Command, containerYAML.Command...) } else if imageData != nil && imageData.Config != nil { containerConfig.Command = append(containerConfig.Command, imageData.Config.Cmd...) } if imageData != nil && len(containerConfig.Command) == 0 { return nil, errors.Errorf("No command specified in container YAML or as CMD or ENTRYPOINT in this image for %s", containerConfig.Name) } containerConfig.StopSignal = 15 // If the user does not pass in ID mappings, just set to basics if containerConfig.IDMappings == nil { containerConfig.IDMappings = &storage.IDMappingOptions{} } containerConfig.NetMode = ns.NetworkMode(namespaces["net"]) containerConfig.IpcMode = ns.IpcMode(namespaces["ipc"]) containerConfig.UtsMode = ns.UTSMode(namespaces["uts"]) // disabled in code review per mheon //containerConfig.PidMode = ns.PidMode(namespaces["pid"]) containerConfig.UsernsMode = ns.UsernsMode(namespaces["user"]) if len(containerConfig.WorkDir) == 0 { containerConfig.WorkDir = "/" } if len(containerYAML.Env) > 0 { envs = make(map[string]string) } // Environment Variables for _, e := range containerYAML.Env { envs[e.Name] = e.Value } containerConfig.Env = envs for _, volume := range containerYAML.VolumeMounts { host_path, exists := volumes[volume.Name] if !exists { return nil, errors.Errorf("Volume mount %s specified for container but not configured in volumes", volume.Name) } if err := shared.ValidateVolumeCtrDir(volume.MountPath); err != nil { return nil, errors.Wrapf(err, "error in parsing MountPath") } containerConfig.Volumes = append(containerConfig.Volumes, fmt.Sprintf("%s:%s", host_path, volume.MountPath)) } return &containerConfig, nil }