Add ShimCgroup path for placing shim in cgroup

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

container_linux_test.go

@@ -3,10 +3,12 @@
 package containerd
 
 import (
+	"context"
 	"syscall"
 	"testing"
 
 	"github.com/containerd/cgroups"
+	"github.com/containerd/containerd/linux/runcopts"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
 )
 
@@ -98,3 +100,78 @@ func TestContainerUpdate(t *testing.T) {
 
 	<-statusC
 }
+
+func TestShimInCgroup(t *testing.T) {
+	client, err := newClient(t, address)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer client.Close()
+
+	var (
+		ctx, cancel = testContext()
+		id          = t.Name()
+	)
+	defer cancel()
+
+	image, err := client.GetImage(ctx, testImage)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	spec, err := GenerateSpec(WithImageConfig(ctx, image), WithProcessArgs("sleep", "30"))
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	container, err := client.NewContainer(ctx, id, WithSpec(spec), WithNewSnapshot(id, image))
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	defer container.Delete(ctx, WithSnapshotCleanup)
+	// create a cgroup for the shim to use
+	path := "/containerd/shim"
+	cg, err := cgroups.New(cgroups.V1, cgroups.StaticPath(path), &specs.LinuxResources{})
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	defer cg.Delete()
+
+	task, err := container.NewTask(ctx, empty(), func(_ context.Context, client *Client, r *TaskInfo) error {
+		r.Options = &runcopts.CreateOptions{
+			ShimCgroup: path,
+		}
+		return nil
+	})
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	defer task.Delete(ctx)
+
+	statusC := make(chan uint32, 1)
+	go func() {
+		status, err := task.Wait(ctx)
+		if err != nil {
+			t.Error(err)
+		}
+		statusC <- status
+	}()
+	// check to see if the shim is inside the cgroup
+	processes, err := cg.Processes(cgroups.Devices, false)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	if len(processes) == 0 {
+		t.Errorf("created cgroup should have atleast one process inside: %d", len(processes))
+	}
+	if err := task.Kill(ctx, syscall.SIGKILL); err != nil {
+		t.Error(err)
+		return
+	}
+
+	<-statusC
+}

linux/bundle.go

@@ -9,7 +9,10 @@ import (
 	"os"
 	"path/filepath"
 
+	"github.com/containerd/containerd/linux/runcopts"
 	client "github.com/containerd/containerd/linux/shim"
+	"github.com/containerd/containerd/runtime"
+	"github.com/containerd/containerd/typeurl"
 )
 
 func loadBundle(path, namespace string) *bundle {
@@ -56,15 +59,24 @@ type bundle struct {
 }
 
 // NewShim connects to the shim managing the bundle and tasks
-func (b *bundle) NewShim(ctx context.Context, binary, grpcAddress string, remote, debug bool) (*client.Client, error) {
+func (b *bundle) NewShim(ctx context.Context, binary, grpcAddress string, remote, debug bool, createOpts runtime.CreateOpts) (*client.Client, error) {
 	opt := client.WithStart(binary, grpcAddress, debug)
 	if !remote {
 		opt = client.WithLocal
 	}
+	var options runcopts.CreateOptions
+	if createOpts.Options != nil {
+		v, err := typeurl.UnmarshalAny(createOpts.Options)
+		if err != nil {
+			return nil, err
+		}
+		options = *v.(*runcopts.CreateOptions)
+	}
 	return client.New(ctx, client.Config{
 		Address:    b.shimAddress(),
 		Path:       b.path,
 		Namespace:  b.namespace,
+		CgroupPath: options.ShimCgroup,
 	}, opt)
 }
 

linux/runcopts/runc.pb.go

@@ -54,6 +54,7 @@ type CreateOptions struct {
 	EmptyNamespaces     []string `protobuf:"bytes,6,rep,name=empty_namespaces,json=emptyNamespaces" json:"empty_namespaces,omitempty"`
 	CgroupsMode         string   `protobuf:"bytes,7,opt,name=cgroups_mode,json=cgroupsMode,proto3" json:"cgroups_mode,omitempty"`
 	NoNewKeyring        bool     `protobuf:"varint,8,opt,name=no_new_keyring,json=noNewKeyring,proto3" json:"no_new_keyring,omitempty"`
+	ShimCgroup          string   `protobuf:"bytes,9,opt,name=shim_cgroup,json=shimCgroup,proto3" json:"shim_cgroup,omitempty"`
 }
 
 func (m *CreateOptions) Reset()                    { *m = CreateOptions{} }
@@ -205,6 +206,12 @@ func (m *CreateOptions) MarshalTo(dAtA []byte) (int, error) {
 		}
 		i++
 	}
+	if len(m.ShimCgroup) > 0 {
+		dAtA[i] = 0x4a
+		i++
+		i = encodeVarintRunc(dAtA, i, uint64(len(m.ShimCgroup)))
+		i += copy(dAtA[i:], m.ShimCgroup)
+	}
 	return i, nil
 }
 
@@ -369,6 +376,10 @@ func (m *CreateOptions) Size() (n int) {
 	if m.NoNewKeyring {
 		n += 2
 	}
+	l = len(m.ShimCgroup)
+	if l > 0 {
+		n += 1 + l + sovRunc(uint64(l))
+	}
 	return n
 }
 
@@ -440,6 +451,7 @@ func (this *CreateOptions) String() string {
 		`EmptyNamespaces:` + fmt.Sprintf("%v", this.EmptyNamespaces) + `,`,
 		`CgroupsMode:` + fmt.Sprintf("%v", this.CgroupsMode) + `,`,
 		`NoNewKeyring:` + fmt.Sprintf("%v", this.NoNewKeyring) + `,`,
+		`ShimCgroup:` + fmt.Sprintf("%v", this.ShimCgroup) + `,`,
 		`}`,
 	}, "")
 	return s
@@ -783,6 +795,35 @@ func (m *CreateOptions) Unmarshal(dAtA []byte) error {
 				}
 			}
 			m.NoNewKeyring = bool(v != 0)
+		case 9:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ShimCgroup", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowRunc
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthRunc
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.ShimCgroup = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipRunc(dAtA[iNdEx:])
@@ -1122,32 +1163,33 @@ func init() {
 }
 
 var fileDescriptorRunc = []byte{
-	// 428 bytes of a gzipped FileDescriptorProto
+	// 438 bytes of a gzipped FileDescriptorProto
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+	0xba, 0x8f, 0x6f, 0x03, 0x00, 0x00,
 }

linux/runcopts/runc.proto

@@ -20,6 +20,7 @@ message CreateOptions {
 	repeated string empty_namespaces = 6;
 	string cgroups_mode = 7;
 	bool no_new_keyring = 8;
+	string shim_cgroup = 9;
 }
 
 message CheckpointOptions {

linux/runtime.go

@@ -139,7 +139,7 @@ func (r *Runtime) Create(ctx context.Context, id string, opts runtime.CreateOpts
 			bundle.Delete()
 		}
 	}()
-	s, err := bundle.NewShim(ctx, r.shim, r.address, r.remote, r.shimDebug)
+	s, err := bundle.NewShim(ctx, r.shim, r.address, r.remote, r.shimDebug, opts)
 	if err != nil {
 		return nil, err
 	}

linux/shim/client.go

@@ -28,7 +28,7 @@ type ClientOpt func(context.Context, Config) (shim.ShimClient, io.Closer, error)
 
 // WithStart executes a new shim process
 func WithStart(binary, address string, debug bool) ClientOpt {
-	return func(ctx context.Context, config Config) (shim.ShimClient, io.Closer, error) {
+	return func(ctx context.Context, config Config) (_ shim.ShimClient, _ io.Closer, err error) {
 		socket, err := newSocket(config)
 		if err != nil {
 			return nil, nil, err
@@ -44,16 +44,36 @@ func WithStart(binary, address string, debug bool) ClientOpt {
 		if err := reaper.Default.Start(cmd); err != nil {
 			return nil, nil, errors.Wrapf(err, "failed to start shim")
 		}
+		defer func() {
+			if err != nil {
+				terminate(cmd)
+			}
+		}()
 		log.G(ctx).WithFields(logrus.Fields{
 			"pid":     cmd.Process.Pid,
 			"address": config.Address,
 			"debug":   debug,
 		}).Infof("shim %s started", binary)
+		// set shim in cgroup if it is provided
+		if config.CgroupPath != "" {
+			if err := setCgroup(ctx, config, cmd); err != nil {
+				return nil, nil, err
+			}
+		}
 		if err = sys.SetOOMScore(cmd.Process.Pid, sys.OOMScoreMaxKillable); err != nil {
 			return nil, nil, errors.Wrap(err, "failed to set OOM Score on shim")
 		}
-		return WithConnect(ctx, config)
+		c, clo, err := WithConnect(ctx, config)
+		if err != nil {
+			return nil, nil, errors.Wrap(err, "failed to connect")
 		}
+		return c, clo, nil
+	}
+}
+
+func terminate(cmd *exec.Cmd) {
+	cmd.Process.Kill()
+	reaper.Default.Wait(cmd)
 }
 
 func newCommand(binary, address string, debug bool, config Config, socket *os.File) *exec.Cmd {
@@ -141,6 +161,7 @@ type Config struct {
 	Address    string
 	Path       string
 	Namespace  string
+	CgroupPath string
 }
 
 // New returns a new shim client

linux/shim/client_linux.go

@@ -2,9 +2,35 @@
 
 package shim
 
-import "syscall"
+import (
+	"context"
+	"os/exec"
+	"syscall"
+
+	"github.com/containerd/cgroups"
+	"github.com/containerd/containerd/log"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+)
 
 var atter = syscall.SysProcAttr{
 	Cloneflags: syscall.CLONE_NEWNS,
 	Setpgid:    true,
 }
+
+func setCgroup(ctx context.Context, config Config, cmd *exec.Cmd) error {
+	cg, err := cgroups.Load(cgroups.V1, cgroups.StaticPath(config.CgroupPath))
+	if err != nil {
+		return errors.Wrapf(err, "failed to load cgroup %s", config.CgroupPath)
+	}
+	if err := cg.Add(cgroups.Process{
+		Pid: cmd.Process.Pid,
+	}); err != nil {
+		return errors.Wrapf(err, "failed to join cgroup %s", config.CgroupPath)
+	}
+	log.G(ctx).WithFields(logrus.Fields{
+		"pid":     cmd.Process.Pid,
+		"address": config.Address,
+	}).Infof("shim placed in cgroup %s", config.CgroupPath)
+	return nil
+}

linux/shim/client_unix.go

@@ -2,8 +2,16 @@
 
 package shim
 
-import "syscall"
+import (
+	"context"
+	"os/exec"
+	"syscall"
+)
 
 var atter = syscall.SysProcAttr{
 	Setpgid: true,
 }
+
+func setCgroup(ctx context.Context, config Config, cmd *exec.Cmd) error {
+	return nil
+}