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-rw-r--r--cmd/podman/kube.go22
-rw-r--r--cmd/podman/kube_generate.go93
-rw-r--r--cmd/podman/main.go1
-rw-r--r--libpod/kube.go270
4 files changed, 386 insertions, 0 deletions
diff --git a/cmd/podman/kube.go b/cmd/podman/kube.go
new file mode 100644
index 000000000..ced87e2bd
--- /dev/null
+++ b/cmd/podman/kube.go
@@ -0,0 +1,22 @@
+package main
+
+import (
+ "github.com/urfave/cli"
+)
+
+var (
+ kubeSubCommands = []cli.Command{
+ containerKubeCommand,
+ }
+
+ kubeDescription = "Work with Kubernetes objects"
+ kubeCommand = cli.Command{
+ Name: "kube",
+ Usage: "Import and export Kubernetes objections from and to Podman",
+ Description: containerDescription,
+ ArgsUsage: "",
+ Subcommands: kubeSubCommands,
+ UseShortOptionHandling: true,
+ OnUsageError: usageErrorHandler,
+ }
+)
diff --git a/cmd/podman/kube_generate.go b/cmd/podman/kube_generate.go
new file mode 100644
index 000000000..a18912668
--- /dev/null
+++ b/cmd/podman/kube_generate.go
@@ -0,0 +1,93 @@
+package main
+
+import (
+ "fmt"
+
+ "github.com/containers/libpod/cmd/podman/libpodruntime"
+ "github.com/containers/libpod/libpod"
+ "github.com/containers/libpod/pkg/rootless"
+ "github.com/ghodss/yaml"
+ "github.com/pkg/errors"
+ "github.com/sirupsen/logrus"
+ "github.com/urfave/cli"
+)
+
+var (
+ containerKubeFlags = []cli.Flag{
+ cli.BoolFlag{
+ Name: "service, s",
+ Usage: "only generate YAML for kubernetes service object",
+ },
+ LatestFlag,
+ }
+ containerKubeDescription = "Generate Kubernetes Pod YAML"
+ containerKubeCommand = cli.Command{
+ Name: "generate",
+ Usage: "Generate Kubernetes pod YAML for a container",
+ Description: containerKubeDescription,
+ Flags: sortFlags(containerKubeFlags),
+ Action: generateKubeYAMLCmd,
+ ArgsUsage: "CONTAINER-NAME",
+ UseShortOptionHandling: true,
+ OnUsageError: usageErrorHandler,
+ }
+)
+
+// generateKubeYAMLCmdgenerates or replays kube
+func generateKubeYAMLCmd(c *cli.Context) error {
+ var (
+ container *libpod.Container
+ err error
+ output []byte
+ )
+
+ if rootless.IsRootless() {
+ return errors.Wrapf(libpod.ErrNotImplemented, "rootless users")
+ }
+ args := c.Args()
+ if len(args) > 1 || (len(args) < 1 && !c.Bool("latest")) {
+ return errors.Errorf("you must provide one container ID or name or --latest")
+ }
+ if c.Bool("service") {
+ return errors.Wrapf(libpod.ErrNotImplemented, "service generation")
+ }
+
+ runtime, err := libpodruntime.GetRuntime(c)
+ if err != nil {
+ return errors.Wrapf(err, "could not get runtime")
+ }
+ defer runtime.Shutdown(false)
+
+ // Get the container in question
+ if c.Bool("latest") {
+ container, err = runtime.GetLatestContainer()
+ } else {
+ container, err = runtime.LookupContainer(args[0])
+ }
+ if err != nil {
+ return err
+ }
+
+ if len(container.Dependencies()) > 0 {
+ return errors.Wrapf(libpod.ErrNotImplemented, "containers with dependencies")
+ }
+
+ podYAML, err := container.InspectForKube()
+ if err != nil {
+ return err
+ }
+
+ developmentComment := []byte("# Generation of Kubenetes YAML is still under development!\n")
+ logrus.Warn("This function is still under heavy development.")
+ // Marshall the results
+ b, err := yaml.Marshal(podYAML)
+ if err != nil {
+ return err
+ }
+ output = append(output, developmentComment...)
+ output = append(output, b...)
+ // Output the v1.Pod with the v1.Container
+ fmt.Println(string(output))
+
+ return nil
+}
diff --git a/cmd/podman/main.go b/cmd/podman/main.go
index 38eac4504..6be192593 100644
--- a/cmd/podman/main.go
+++ b/cmd/podman/main.go
@@ -77,6 +77,7 @@ func main() {
infoCommand,
inspectCommand,
killCommand,
+ kubeCommand,
loadCommand,
loginCommand,
logoutCommand,
diff --git a/libpod/kube.go b/libpod/kube.go
new file mode 100644
index 000000000..00db0033b
--- /dev/null
+++ b/libpod/kube.go
@@ -0,0 +1,270 @@
+package libpod
+
+import (
+ "fmt"
+ "strings"
+
+ "github.com/containers/libpod/pkg/lookup"
+ "github.com/containers/libpod/pkg/util"
+ "github.com/cri-o/ocicni/pkg/ocicni"
+ "github.com/opencontainers/runtime-spec/specs-go"
+ "github.com/pkg/errors"
+ "github.com/sirupsen/logrus"
+ "k8s.io/api/core/v1"
+ "k8s.io/apimachinery/pkg/api/resource"
+ v12 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// InspectForKube takes a slice of libpod containers and generates
+// one v1.Pod description that includes just a single container.
+func (c *Container) InspectForKube() (*v1.Pod, error) {
+ // Generate the v1.Pod yaml description
+ return simplePodWithV1Container(c)
+}
+
+// simplePodWithV1Container is a function used by inspect when kube yaml needs to be generated
+// for a single container. we "insert" that container description in a pod.
+func simplePodWithV1Container(ctr *Container) (*v1.Pod, error) {
+ var containers []v1.Container
+ result, err := containerToV1Container(ctr)
+ if err != nil {
+ return nil, err
+ }
+ containers = append(containers, result)
+
+ tm := v12.TypeMeta{
+ Kind: "Pod",
+ APIVersion: "v1",
+ }
+
+ // Add a label called "app" with the containers name as a value
+ labels := make(map[string]string)
+ labels["app"] = removeUnderscores(ctr.Name())
+ om := v12.ObjectMeta{
+ // The name of the pod is container_name-libpod
+ Name: fmt.Sprintf("%s-libpod", removeUnderscores(ctr.Name())),
+ Labels: labels,
+ // CreationTimestamp seems to be required, so adding it; in doing so, the timestamp
+ // will reflect time this is run (not container create time) because the conversion
+ // of the container create time to v1 Time is probably not warranted nor worthwhile.
+ CreationTimestamp: v12.Now(),
+ }
+ ps := v1.PodSpec{
+ Containers: containers,
+ }
+ p := v1.Pod{
+ TypeMeta: tm,
+ ObjectMeta: om,
+ Spec: ps,
+ }
+ return &p, nil
+}
+
+// containerToV1Container converts information we know about a libpod container
+// to a V1.Container specification.
+func containerToV1Container(c *Container) (v1.Container, error) {
+ kubeContainer := v1.Container{}
+ kubeSec, err := generateKubeSecurityContext(c)
+ if err != nil {
+ return kubeContainer, err
+ }
+
+ if len(c.config.Spec.Linux.Devices) > 0 {
+ // TODO Enable when we can support devices and their names
+ devices, err := generateKubeVolumeDeviceFromLinuxDevice(c.Spec().Linux.Devices)
+ if err != nil {
+ return kubeContainer, err
+ }
+ kubeContainer.VolumeDevices = devices
+ return kubeContainer, errors.Wrapf(ErrNotImplemented, "linux devices")
+ }
+
+ if len(c.config.UserVolumes) > 0 {
+ // TODO When we until we can resolve what the volume name should be, this is disabled
+ // Volume names need to be coordinated "globally" in the kube files.
+ volumes, err := libpodMountsToKubeVolumeMounts(c)
+ if err != nil {
+ return kubeContainer, err
+ }
+ kubeContainer.VolumeMounts = volumes
+ return kubeContainer, errors.Wrapf(ErrNotImplemented, "volume names")
+ }
+
+ envVariables, err := libpodEnvVarsToKubeEnvVars(c.config.Spec.Process.Env)
+ if err != nil {
+ return kubeContainer, nil
+ }
+
+ ports, err := ocicniPortMappingToContainerPort(c.PortMappings())
+ if err != nil {
+ return kubeContainer, nil
+ }
+
+ containerCommands := c.Command()
+ kubeContainer.Name = removeUnderscores(c.Name())
+
+ _, image := c.Image()
+ kubeContainer.Image = image
+ kubeContainer.Stdin = c.Stdin()
+ kubeContainer.Command = containerCommands
+ // TODO need to figure out how we handle command vs entry point. Kube appears to prefer entrypoint.
+ // right now we just take the container's command
+ //container.Args = args
+ kubeContainer.WorkingDir = c.WorkingDir()
+ kubeContainer.Ports = ports
+ // This should not be applicable
+ //container.EnvFromSource =
+ kubeContainer.Env = envVariables
+ // TODO enable resources when we can support naming conventions
+ //container.Resources
+ kubeContainer.SecurityContext = kubeSec
+ kubeContainer.StdinOnce = false
+ kubeContainer.TTY = c.config.Spec.Process.Terminal
+
+ return kubeContainer, nil
+}
+
+// ocicniPortMappingToContainerPort takes an ocicni portmapping and converts
+// it to a v1.ContainerPort format for kube output
+func ocicniPortMappingToContainerPort(portMappings []ocicni.PortMapping) ([]v1.ContainerPort, error) {
+ var containerPorts []v1.ContainerPort
+ for _, p := range portMappings {
+ var protocol v1.Protocol
+ switch strings.ToUpper(p.Protocol) {
+ case "TCP":
+ protocol = v1.ProtocolTCP
+ case "UDP":
+ protocol = v1.ProtocolUDP
+ default:
+ return containerPorts, errors.Errorf("unknown network protocol %s", p.Protocol)
+ }
+ cp := v1.ContainerPort{
+ // Name will not be supported
+ HostPort: p.HostPort,
+ HostIP: p.HostIP,
+ ContainerPort: p.ContainerPort,
+ Protocol: protocol,
+ }
+ containerPorts = append(containerPorts, cp)
+ }
+ return containerPorts, nil
+}
+
+// libpodEnvVarsToKubeEnvVars converts a key=value string slice to []v1.EnvVar
+func libpodEnvVarsToKubeEnvVars(envs []string) ([]v1.EnvVar, error) {
+ var envVars []v1.EnvVar
+ for _, e := range envs {
+ splitE := strings.SplitN(e, "=", 2)
+ if len(splitE) != 2 {
+ return envVars, errors.Errorf("environment variable %s is malformed; should be key=value", e)
+ }
+ ev := v1.EnvVar{
+ Name: splitE[0],
+ Value: splitE[1],
+ }
+ envVars = append(envVars, ev)
+ }
+ return envVars, nil
+}
+
+// Is this worth it?
+func libpodMaxAndMinToResourceList(c *Container) (v1.ResourceList, v1.ResourceList) { //nolint
+ // It does not appear we can properly calculate CPU resources from the information
+ // we know in libpod. Libpod knows CPUs by time, shares, etc.
+
+ // We also only know about a memory limit; no memory minimum
+ maxResources := make(map[v1.ResourceName]resource.Quantity)
+ minResources := make(map[v1.ResourceName]resource.Quantity)
+ config := c.Config()
+ maxMem := config.Spec.Linux.Resources.Memory.Limit
+
+ _ = maxMem
+
+ return maxResources, minResources
+}
+
+func generateKubeVolumeMount(hostSourcePath string, mounts []specs.Mount) (v1.VolumeMount, error) {
+ vm := v1.VolumeMount{}
+ for _, m := range mounts {
+ if m.Source == hostSourcePath {
+ // TODO Name is not provided and is required by Kube; therefore, this is disabled earlier
+ //vm.Name =
+ vm.MountPath = m.Source
+ vm.SubPath = m.Destination
+ if util.StringInSlice("ro", m.Options) {
+ vm.ReadOnly = true
+ }
+ return vm, nil
+ }
+ }
+ return vm, errors.New("unable to find mount source")
+}
+
+// libpodMountsToKubeVolumeMounts converts the containers mounts to a struct kube understands
+func libpodMountsToKubeVolumeMounts(c *Container) ([]v1.VolumeMount, error) {
+ // At this point, I dont think we can distinguish between the default
+ // volume mounts and user added ones. For now, we pass them all.
+ var vms []v1.VolumeMount
+ for _, hostSourcePath := range c.config.UserVolumes {
+ vm, err := generateKubeVolumeMount(hostSourcePath, c.config.Spec.Mounts)
+ if err != nil {
+ return vms, err
+ }
+ vms = append(vms, vm)
+ }
+ return vms, nil
+}
+
+// generateKubeSecurityContext generates a securityContext based on the existing container
+func generateKubeSecurityContext(c *Container) (*v1.SecurityContext, error) {
+ priv := c.Privileged()
+ ro := c.IsReadOnly()
+ allowPrivEscalation := !c.Spec().Process.NoNewPrivileges
+
+ // TODO enable use of capabilities when we can figure out how to extract cap-add|remove
+ //caps := v1.Capabilities{
+ // //Add: c.config.Spec.Process.Capabilities
+ //}
+ sc := v1.SecurityContext{
+ // TODO enable use of capabilities when we can figure out how to extract cap-add|remove
+ //Capabilities: &caps,
+ Privileged: &priv,
+ // TODO How do we know if selinux were passed into podman
+ //SELinuxOptions:
+ // RunAsNonRoot is an optional parameter; our first implementations should be root only; however
+ // I'm leaving this as a bread-crumb for later
+ //RunAsNonRoot: &nonRoot,
+ ReadOnlyRootFilesystem: &ro,
+ AllowPrivilegeEscalation: &allowPrivEscalation,
+ }
+
+ if c.User() != "" {
+ // It is *possible* that
+ logrus.Debug("Looking in container for user: %s", c.User())
+ u, err := lookup.GetUser(c.state.Mountpoint, c.User())
+ if err != nil {
+ return nil, err
+ }
+ user := int64(u.Uid)
+ sc.RunAsUser = &user
+ }
+ return &sc, nil
+}
+
+// generateKubeVolumeDeviceFromLinuxDevice takes a list of devices and makes a VolumeDevice struct for kube
+func generateKubeVolumeDeviceFromLinuxDevice(devices []specs.LinuxDevice) ([]v1.VolumeDevice, error) {
+ var volumeDevices []v1.VolumeDevice
+ for _, d := range devices {
+ vd := v1.VolumeDevice{
+ // TBD How are we going to sync up these names
+ //Name:
+ DevicePath: d.Path,
+ }
+ volumeDevices = append(volumeDevices, vd)
+ }
+ return volumeDevices, nil
+}
+
+func removeUnderscores(s string) string {
+ return strings.Replace(s, "_", "", -1)
+}
generated by cgit v1.2.3-54-g00ecf (git 2.39.0) at 2024-09-27 17:20:48 +0000