508 lines
14 KiB
Go
508 lines
14 KiB
Go
package server
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import (
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"errors"
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"fmt"
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"os"
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"path/filepath"
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"syscall"
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"github.com/Sirupsen/logrus"
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"github.com/docker/docker/pkg/stringid"
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"github.com/kubernetes-incubator/cri-o/oci"
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"github.com/kubernetes-incubator/cri-o/utils"
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"github.com/opencontainers/runc/libcontainer/label"
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"github.com/opencontainers/runtime-tools/generate"
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"golang.org/x/net/context"
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pb "k8s.io/kubernetes/pkg/kubelet/api/v1alpha1/runtime"
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)
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const (
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// ContainerStateCreated represents the created state of a container
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ContainerStateCreated = "created"
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// ContainerStateRunning represents the running state of a container
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ContainerStateRunning = "running"
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// ContainerStateStopped represents the stopped state of a container
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ContainerStateStopped = "stopped"
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)
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func (s *Server) generateContainerIDandName(podName string, name string, attempt uint32) (string, string, error) {
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var (
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err error
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id = stringid.GenerateNonCryptoID()
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)
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nameStr := fmt.Sprintf("%s-%s-%v", podName, name, attempt)
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if name == "infra" {
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nameStr = fmt.Sprintf("%s-%s", podName, name)
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}
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if name, err = s.reserveContainerName(id, nameStr); err != nil {
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return "", "", err
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}
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return id, name, err
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}
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// CreateContainer creates a new container in specified PodSandbox
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func (s *Server) CreateContainer(ctx context.Context, req *pb.CreateContainerRequest) (*pb.CreateContainerResponse, error) {
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sbID := req.GetPodSandboxId()
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if sbID == "" {
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return nil, fmt.Errorf("PodSandboxId should not be empty")
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}
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sandboxID, err := s.podIDIndex.Get(sbID)
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if err != nil {
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return nil, fmt.Errorf("PodSandbox with ID starting with %s not found: %v", sbID, err)
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}
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sb := s.getSandbox(sandboxID)
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if sb == nil {
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return nil, fmt.Errorf("specified sandbox not found: %s", sandboxID)
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}
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// The config of the container
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containerConfig := req.GetConfig()
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if containerConfig == nil {
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return nil, fmt.Errorf("CreateContainerRequest.ContainerConfig is nil")
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}
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name := containerConfig.GetMetadata().GetName()
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if name == "" {
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return nil, fmt.Errorf("CreateContainerRequest.ContainerConfig.Name is empty")
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}
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attempt := containerConfig.GetMetadata().GetAttempt()
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containerID, containerName, err := s.generateContainerIDandName(sb.name, name, attempt)
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if err != nil {
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return nil, err
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}
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// containerDir is the dir for the container bundle.
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containerDir := filepath.Join(s.runtime.ContainerDir(), containerID)
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if _, err = os.Stat(containerDir); err == nil {
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return nil, fmt.Errorf("container (%s) already exists", containerDir)
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}
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if err = os.MkdirAll(containerDir, 0755); err != nil {
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return nil, err
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}
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container, err := s.createSandboxContainer(containerID, containerName, sb, req.GetSandboxConfig(), containerDir, containerConfig)
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if err != nil {
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return nil, err
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}
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if err := s.runtime.CreateContainer(container); err != nil {
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return nil, err
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}
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if err := s.runtime.UpdateStatus(container); err != nil {
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return nil, err
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}
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s.addContainer(container)
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if err := s.ctrIDIndex.Add(containerID); err != nil {
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return nil, err
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}
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return &pb.CreateContainerResponse{
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ContainerId: &containerID,
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}, nil
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}
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func (s *Server) createSandboxContainer(containerID string, containerName string, sb *sandbox, SandboxConfig *pb.PodSandboxConfig, containerDir string, containerConfig *pb.ContainerConfig) (*oci.Container, error) {
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if sb == nil {
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return nil, errors.New("createSandboxContainer needs a sandbox")
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}
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// creates a spec Generator with the default spec.
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specgen := generate.New()
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// by default, the root path is an empty string.
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// here set it to be "rootfs".
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specgen.SetRootPath("rootfs")
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args := containerConfig.GetArgs()
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if args == nil {
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args = []string{"/bin/sh"}
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}
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specgen.SetProcessArgs(args)
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cwd := containerConfig.GetWorkingDir()
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if cwd == "" {
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cwd = "/"
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}
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specgen.SetProcessCwd(cwd)
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envs := containerConfig.GetEnvs()
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if envs != nil {
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for _, item := range envs {
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key := item.GetKey()
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value := item.GetValue()
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if key == "" {
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continue
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}
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env := fmt.Sprintf("%s=%s", key, value)
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specgen.AddProcessEnv(env)
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}
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}
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mounts := containerConfig.GetMounts()
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for _, mount := range mounts {
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dest := mount.GetContainerPath()
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if dest == "" {
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return nil, fmt.Errorf("Mount.ContainerPath is empty")
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}
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src := mount.GetHostPath()
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if src == "" {
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return nil, fmt.Errorf("Mount.HostPath is empty")
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}
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options := "rw"
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if mount.GetReadonly() {
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options = "ro"
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}
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if mount.GetSelinuxRelabel() {
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// Need a way in kubernetes to determine if the volume is shared or private
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if err := label.Relabel(src, sb.mountLabel, true); err != nil && err != syscall.ENOTSUP {
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return nil, fmt.Errorf("relabel failed %s: %v", src, err)
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}
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}
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specgen.AddBindMount(src, dest, options)
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}
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labels := containerConfig.GetLabels()
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annotations := containerConfig.GetAnnotations()
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if annotations != nil {
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for k, v := range annotations {
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specgen.AddAnnotation(k, v)
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}
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}
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if containerConfig.GetPrivileged() {
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specgen.SetupPrivileged(true)
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}
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if containerConfig.GetReadonlyRootfs() {
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specgen.SetRootReadonly(true)
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}
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logPath := containerConfig.GetLogPath()
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if containerConfig.GetTty() {
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specgen.SetProcessTerminal(true)
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}
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linux := containerConfig.GetLinux()
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if linux != nil {
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resources := linux.GetResources()
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if resources != nil {
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cpuPeriod := resources.GetCpuPeriod()
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if cpuPeriod != 0 {
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specgen.SetLinuxResourcesCPUPeriod(uint64(cpuPeriod))
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}
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cpuQuota := resources.GetCpuQuota()
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if cpuQuota != 0 {
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specgen.SetLinuxResourcesCPUQuota(uint64(cpuQuota))
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}
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cpuShares := resources.GetCpuShares()
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if cpuShares != 0 {
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specgen.SetLinuxResourcesCPUShares(uint64(cpuShares))
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}
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memoryLimit := resources.GetMemoryLimitInBytes()
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if memoryLimit != 0 {
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specgen.SetLinuxResourcesMemoryLimit(uint64(memoryLimit))
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}
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oomScoreAdj := resources.GetOomScoreAdj()
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specgen.SetLinuxResourcesOOMScoreAdj(int(oomScoreAdj))
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}
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capabilities := linux.GetCapabilities()
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if capabilities != nil {
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addCaps := capabilities.GetAddCapabilities()
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if addCaps != nil {
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for _, cap := range addCaps {
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if err := specgen.AddProcessCapability(cap); err != nil {
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return nil, err
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}
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}
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}
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dropCaps := capabilities.GetDropCapabilities()
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if dropCaps != nil {
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for _, cap := range dropCaps {
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if err := specgen.DropProcessCapability(cap); err != nil {
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return nil, err
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}
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}
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}
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}
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specgen.SetProcessSelinuxLabel(sb.processLabel)
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specgen.SetLinuxMountLabel(sb.mountLabel)
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user := linux.GetUser()
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if user != nil {
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uid := user.GetUid()
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specgen.SetProcessUID(uint32(uid))
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gid := user.GetGid()
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specgen.SetProcessGID(uint32(gid))
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groups := user.GetAdditionalGids()
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if groups != nil {
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for _, group := range groups {
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specgen.AddProcessAdditionalGid(uint32(group))
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}
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}
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}
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}
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// Join the namespace paths for the pod sandbox container.
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podContainerName := sb.name + "-infra"
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podInfraContainer := sb.getContainer(podContainerName)
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podInfraState := s.runtime.ContainerStatus(podInfraContainer)
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logrus.Infof("pod container state %v", podInfraState)
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for nsType, nsFile := range map[string]string{
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"ipc": "ipc",
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"uts": "uts",
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"network": "net",
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} {
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nsPath := fmt.Sprintf("/proc/%d/ns/%s", podInfraState.Pid, nsFile)
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if err := specgen.AddOrReplaceLinuxNamespace(nsType, nsPath); err != nil {
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return nil, err
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}
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}
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if err := specgen.SaveToFile(filepath.Join(containerDir, "config.json")); err != nil {
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return nil, err
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}
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imageSpec := containerConfig.GetImage()
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if imageSpec == nil {
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return nil, fmt.Errorf("CreateContainerRequest.ContainerConfig.Image is nil")
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}
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image := imageSpec.GetImage()
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if image == "" {
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return nil, fmt.Errorf("CreateContainerRequest.ContainerConfig.Image.Image is empty")
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}
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// TODO: copy the rootfs into the bundle.
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// Currently, utils.CreateFakeRootfs is used to populate the rootfs.
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if err := utils.CreateFakeRootfs(containerDir, image); err != nil {
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return nil, err
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}
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container, err := oci.NewContainer(containerID, containerName, containerDir, logPath, labels, sb.id, containerConfig.GetTty())
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if err != nil {
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return nil, err
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}
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return container, nil
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}
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// StartContainer starts the container.
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func (s *Server) StartContainer(ctx context.Context, req *pb.StartContainerRequest) (*pb.StartContainerResponse, error) {
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ctrID := req.GetContainerId()
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if ctrID == "" {
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return nil, fmt.Errorf("container ID should not be empty")
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}
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containerID, err := s.ctrIDIndex.Get(ctrID)
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if err != nil {
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return nil, fmt.Errorf("container with ID starting with %s not found: %v", ctrID, err)
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}
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c := s.state.containers.Get(containerID)
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if c == nil {
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return nil, fmt.Errorf("specified container not found: %s", containerID)
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}
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if err := s.runtime.StartContainer(c); err != nil {
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return nil, fmt.Errorf("failed to start container %s in sandbox %s: %v", c.Name(), containerID, err)
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}
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return &pb.StartContainerResponse{}, nil
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}
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// StopContainer stops a running container with a grace period (i.e., timeout).
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func (s *Server) StopContainer(ctx context.Context, req *pb.StopContainerRequest) (*pb.StopContainerResponse, error) {
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ctrID := req.GetContainerId()
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if ctrID == "" {
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return nil, fmt.Errorf("container ID should not be empty")
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}
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containerID, err := s.ctrIDIndex.Get(ctrID)
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if err != nil {
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return nil, fmt.Errorf("container with ID starting with %s not found: %v", ctrID, err)
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}
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c := s.state.containers.Get(containerID)
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if c == nil {
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return nil, fmt.Errorf("specified container not found: %s", containerID)
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}
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if err := s.runtime.StopContainer(c); err != nil {
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return nil, fmt.Errorf("failed to stop container %s: %v", containerID, err)
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}
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return &pb.StopContainerResponse{}, nil
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}
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// RemoveContainer removes the container. If the container is running, the container
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// should be force removed.
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func (s *Server) RemoveContainer(ctx context.Context, req *pb.RemoveContainerRequest) (*pb.RemoveContainerResponse, error) {
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ctrID := req.GetContainerId()
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if ctrID == "" {
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return nil, fmt.Errorf("container ID should not be empty")
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}
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containerID, err := s.ctrIDIndex.Get(ctrID)
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if err != nil {
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return nil, fmt.Errorf("container with ID starting with %s not found: %v", ctrID, err)
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}
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c := s.state.containers.Get(containerID)
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if c == nil {
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return nil, fmt.Errorf("specified container not found: %s", containerID)
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}
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if err := s.runtime.UpdateStatus(c); err != nil {
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return nil, fmt.Errorf("failed to update container state: %v", err)
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}
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cState := s.runtime.ContainerStatus(c)
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if cState.Status == ContainerStateCreated || cState.Status == ContainerStateRunning {
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if err := s.runtime.StopContainer(c); err != nil {
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return nil, fmt.Errorf("failed to stop container %s: %v", containerID, err)
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}
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}
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if err := s.runtime.DeleteContainer(c); err != nil {
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return nil, fmt.Errorf("failed to delete container %s: %v", containerID, err)
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}
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containerDir := filepath.Join(s.runtime.ContainerDir(), containerID)
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if err := os.RemoveAll(containerDir); err != nil {
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return nil, fmt.Errorf("failed to remove container %s directory: %v", containerID, err)
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}
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s.releaseContainerName(c.Name())
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s.removeContainer(c)
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if err := s.ctrIDIndex.Delete(c.ID()); err != nil {
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return nil, err
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}
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return &pb.RemoveContainerResponse{}, nil
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}
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// ListContainers lists all containers by filters.
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func (s *Server) ListContainers(ctx context.Context, req *pb.ListContainersRequest) (*pb.ListContainersResponse, error) {
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var ctrs []*pb.Container
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for _, ctr := range s.state.containers.List() {
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if err := s.runtime.UpdateStatus(ctr); err != nil {
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return nil, err
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}
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podSandboxID := ctr.Sandbox()
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cState := s.runtime.ContainerStatus(ctr)
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created := cState.Created.Unix()
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rState := pb.ContainerState_UNKNOWN
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c := &pb.Container{
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Id: &cState.ID,
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PodSandboxId: &podSandboxID,
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CreatedAt: int64Ptr(created),
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}
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switch cState.Status {
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case ContainerStateCreated:
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rState = pb.ContainerState_CREATED
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case ContainerStateRunning:
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rState = pb.ContainerState_RUNNING
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case ContainerStateStopped:
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rState = pb.ContainerState_EXITED
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}
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c.State = &rState
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ctrs = append(ctrs, c)
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}
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return &pb.ListContainersResponse{
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Containers: ctrs,
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}, nil
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}
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// ContainerStatus returns status of the container.
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func (s *Server) ContainerStatus(ctx context.Context, req *pb.ContainerStatusRequest) (*pb.ContainerStatusResponse, error) {
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ctrID := req.GetContainerId()
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if ctrID == "" {
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return nil, fmt.Errorf("container ID should not be empty")
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}
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containerID, err := s.ctrIDIndex.Get(ctrID)
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if err != nil {
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return nil, fmt.Errorf("container with ID starting with %s not found: %v", ctrID, err)
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}
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c := s.state.containers.Get(containerID)
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if c == nil {
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return nil, fmt.Errorf("specified container not found: %s", containerID)
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}
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if err := s.runtime.UpdateStatus(c); err != nil {
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return nil, err
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}
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csr := &pb.ContainerStatusResponse{
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Status: &pb.ContainerStatus{
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Id: &containerID,
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},
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}
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cState := s.runtime.ContainerStatus(c)
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rStatus := pb.ContainerState_UNKNOWN
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switch cState.Status {
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case ContainerStateCreated:
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rStatus = pb.ContainerState_CREATED
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created := cState.Created.Unix()
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csr.Status.CreatedAt = int64Ptr(created)
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case ContainerStateRunning:
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rStatus = pb.ContainerState_RUNNING
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created := cState.Created.Unix()
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csr.Status.CreatedAt = int64Ptr(created)
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started := cState.Started.Unix()
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csr.Status.StartedAt = int64Ptr(started)
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case ContainerStateStopped:
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rStatus = pb.ContainerState_EXITED
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created := cState.Created.Unix()
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csr.Status.CreatedAt = int64Ptr(created)
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started := cState.Started.Unix()
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csr.Status.StartedAt = int64Ptr(started)
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finished := cState.Finished.Unix()
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csr.Status.FinishedAt = int64Ptr(finished)
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csr.Status.ExitCode = int32Ptr(cState.ExitCode)
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}
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csr.Status.State = &rStatus
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return csr, nil
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}
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// Exec executes the command in the container.
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func (s *Server) Exec(pb.RuntimeService_ExecServer) error {
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return nil
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}
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