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Add oom notifications and pid to create response

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Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
This commit is contained in:
Michael Crosby 2015-12-15 16:22:53 -08:00
parent ec31245f54
commit 76cf593212
13 changed files with 269 additions and 128 deletions
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17
api/grpc/server/server.go
View file

@ -37,6 +37,7 @@ func (s *apiServer) CreateContainer(ctx context.Context, c *types.CreateContaine
e.Stderr = c.Stderr
e.Stdin = c.Stdin
e.Console = c.Console
e.StartResponse = make(chan containerd.StartResponse, 1)
if c.Checkpoint != "" {
e.Checkpoint = &runtime.Checkpoint{
Name: c.Checkpoint,
@ -46,7 +47,10 @@ func (s *apiServer) CreateContainer(ctx context.Context, c *types.CreateContaine
if err := <-e.Err; err != nil {
return nil, err
}
return &types.CreateContainerResponse{}, nil
sr := <-e.StartResponse
return &types.CreateContainerResponse{
Pid: uint32(sr.Pid),
}, nil
}
func (s *apiServer) Signal(ctx context.Context, r *types.SignalRequest) (*types.SignalResponse, error) {
@ -223,18 +227,27 @@ func (s *apiServer) Events(r *types.EventsRequest, stream types.API_EventsServer
events := s.sv.Events()
defer s.sv.Unsubscribe(events)
for evt := range events {
var ev *types.Event
switch evt.Type {
case containerd.ExitEventType, containerd.ExecExitEventType:
ev := &types.Event{
ev = &types.Event{
Type: "exit",
Id: evt.ID,
Pid: uint32(evt.Pid),
Status: uint32(evt.Status),
}
case containerd.OOMEventType:
ev = &types.Event{
Type: "oom",
Id: evt.ID,
}
}
if ev != nil {
if err := stream.Send(ev); err != nil {
return err
}
}
}
return nil
}

185
api/grpc/types/api.pb.go
View file

@ -78,6 +78,7 @@ func (*CreateContainerRequest) ProtoMessage() {}
func (*CreateContainerRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{0} }
type CreateContainerResponse struct {
Pid uint32 `protobuf:"varint,1,opt,name=pid" json:"pid,omitempty"`
}
func (m *CreateContainerResponse) Reset() { *m = CreateContainerResponse{} }
@ -1086,96 +1087,96 @@ var _API_serviceDesc = grpc.ServiceDesc{
}
var fileDescriptor0 = []byte{
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}

1
api/grpc/types/api.proto
View file

@ -26,6 +26,7 @@ message CreateContainerRequest {
}
message CreateContainerResponse {
uint32 pid = 1; // PID of the containers main process
}
message SignalRequest {

9
containerd/main.go
View file

@ -62,6 +62,10 @@ var daemonFlags = []cli.Flag{
Value: "/run/containerd/containerd.sock",
Usage: "Address on which GRPC API will listen",
},
cli.BoolFlag{
Name: "oom-notify",
Usage: "enable oom notifications for containers",
},
}
func main() {
@ -89,6 +93,7 @@ func main() {
context.String("listen"),
context.String("state-dir"),
context.Int("concurrency"),
context.Bool("oom-notify"),
); err != nil {
logrus.Fatal(err)
}
@ -146,9 +151,9 @@ func processMetrics() {
}()
}
func daemon(id, address, stateDir string, concurrency int) error {
func daemon(id, address, stateDir string, concurrency int, oom bool) error {
tasks := make(chan *containerd.StartTask, concurrency*100)
supervisor, err := containerd.NewSupervisor(id, stateDir, tasks)
supervisor, err := containerd.NewSupervisor(id, stateDir, tasks, oom)
if err != nil {
return err
}

1
create.go
View file

@ -21,6 +21,7 @@ func (h *StartEvent) Handle(e *Event) error {
Stdin: e.Stdin,
Stdout: e.Stdout,
Stderr: e.Stderr,
StartResponse: e.StartResponse,
}
if e.Checkpoint != nil {
task.Checkpoint = e.Checkpoint.Name

5
ctr/container.go
View file

@ -121,7 +121,8 @@ var StartCommand = cli.Command{
}
}
}
if _, err := c.CreateContainer(netcontext.Background(), r); err != nil {
resp, err := c.CreateContainer(netcontext.Background(), r)
if err != nil {
fatal(err.Error(), 1)
}
if context.Bool("attach") {
@ -140,6 +141,8 @@ var StartCommand = cli.Command{
os.Exit(int(e.Status))
}
}
} else {
fmt.Println(resp.Pid)
}
},
}

6
event.go
View file

@ -23,6 +23,7 @@ const (
DeleteCheckpointEventType EventType = "deleteCheckpoint"
StatsEventType EventType = "events"
UnsubscribeStatsEventType EventType = "unsubscribeEvents"
OOMEventType EventType = "oom"
)
func NewEvent(t EventType) *Event {
@ -33,6 +34,10 @@ func NewEvent(t EventType) *Event {
}
}
type StartResponse struct {
Pid int
}
type Event struct {
Type EventType
Timestamp time.Time
@ -50,6 +55,7 @@ type Event struct {
Containers []runtime.Container
Checkpoint *runtime.Checkpoint
Err chan error
StartResponse chan StartResponse
Stats chan interface{}
}

4
linux/linux.go
View file

@ -363,6 +363,10 @@ func (c *libcontainerContainer) RemoveProcess(pid int) error {
return err
}
func (c *libcontainerContainer) OOM() (<-chan struct{}, error) {
return c.c.NotifyOOM()
}
func NewRuntime(stateDir string) (runtime.Runtime, error) {
f, err := libcontainer.New(stateDir, libcontainer.Cgroupfs, func(l *libcontainer.LinuxFactory) error {
//l.CriuPath = context.GlobalString("criu")

80
oom.go Normal file
View file

@ -0,0 +1,80 @@
package containerd
import (
"reflect"
"sync"
)
func newNotifier(s *Supervisor) *notifier {
n := &notifier{
s: s,
channels: make(map[<-chan struct{}]string),
controller: make(chan struct{}),
}
go n.start()
return n
}
type notifier struct {
m sync.Mutex
channels map[<-chan struct{}]string
controller chan struct{}
s *Supervisor
}
func (n *notifier) start() {
for {
c := n.createCase()
i, _, ok := reflect.Select(c)
if i == 0 {
continue
}
if ok {
ch := c[i].Chan.Interface().(<-chan struct{})
id := n.channels[ch]
e := NewEvent(OOMEventType)
e.ID = id
n.s.SendEvent(e)
continue
}
// the channel was closed and we should remove it
ch := c[i].Chan.Interface().(<-chan struct{})
n.removeChan(ch)
}
}
func (n *notifier) Add(ch <-chan struct{}, id string) {
n.m.Lock()
n.channels[ch] = id
n.m.Unlock()
// signal the main loop to break and add the new
// channels
n.controller <- struct{}{}
}
func (n *notifier) createCase() []reflect.SelectCase {
var out []reflect.SelectCase
// add controller chan so that we can signal when we need to make
// changes in the select. The controller chan will always be at
// index 0 in the slice
out = append(out, reflect.SelectCase{
Dir: reflect.SelectRecv,
Chan: reflect.ValueOf(n.controller),
})
n.m.Lock()
for ch := range n.channels {
v := reflect.ValueOf(ch)
out = append(out, reflect.SelectCase{
Dir: reflect.SelectRecv,
Chan: v,
})
}
n.m.Unlock()
return out
}
func (n *notifier) removeChan(ch <-chan struct{}) {
n.m.Lock()
delete(n.channels, ch)
n.m.Unlock()
}

4
runc/runc.go
View file

@ -111,6 +111,10 @@ func (c *runcContainer) Checkpoints() ([]runtime.Checkpoint, error) {
return nil, errors.New("not implemented")
}
func (c *runcContainer) OOM() (<-chan struct{}, error) {
return nil, errors.New("not implemented")
}
func (c *runcContainer) newCommand(args ...string) *exec.Cmd {
cmd := exec.Command("runc", append([]string{"--root", c.stateDir, "--id", c.id}, args...)...)
cmd.Dir = c.path

2
runtime/container.go
View file

@ -111,4 +111,6 @@ type Container interface {
Restore(name string) error
// Stats returns realtime container stats and resource information
Stats() (*Stat, error)
// OOM signals the channel if the container received an OOM notification
OOM() (<-chan struct{}, error)
}

6
supervisor.go
View file

@ -17,7 +17,7 @@ import (
const statsInterval = 1 * time.Second
// NewSupervisor returns an initialized Process supervisor.
func NewSupervisor(id, stateDir string, tasks chan *StartTask) (*Supervisor, error) {
func NewSupervisor(id, stateDir string, tasks chan *StartTask, oom bool) (*Supervisor, error) {
if err := os.MkdirAll(stateDir, 0755); err != nil {
return nil, err
}
@ -41,6 +41,9 @@ func NewSupervisor(id, stateDir string, tasks chan *StartTask) (*Supervisor, err
subscribers: make(map[chan *Event]struct{}),
statsCollector: newStatsCollector(statsInterval),
}
if oom {
s.notifier = newNotifier(s)
}
// register default event handlers
s.handlers = map[EventType]Handler{
ExecExitEventType: &ExecExitEvent{s},
@ -81,6 +84,7 @@ type Supervisor struct {
machine Machine
containerGroup sync.WaitGroup
statsCollector *statsCollector
notifier *notifier
}
// Stop closes all tasks and sends a SIGTERM to each container's pid1 then waits for they to

17
worker.go
View file

@ -4,6 +4,7 @@ import (
"sync"
"time"
"github.com/Sirupsen/logrus"
"github.com/docker/containerd/runtime"
)
@ -19,6 +20,7 @@ type StartTask struct {
Stdout string
Stderr string
Err chan error
StartResponse chan StartResponse
}
func NewWorker(s *Supervisor, wg *sync.WaitGroup) Worker {
@ -63,7 +65,22 @@ func (w *worker) Start() {
continue
}
}
pid, err := t.Container.Pid()
if err != nil {
logrus.WithField("error", err).Error("containerd: get container main pid")
}
if w.s.notifier != nil {
n, err := t.Container.OOM()
if err != nil {
logrus.WithField("error", err).Error("containerd: notify OOM events")
} else {
w.s.notifier.Add(n, t.Container.ID())
}
}
ContainerStartTimer.UpdateSince(started)
t.Err <- nil
t.StartResponse <- StartResponse{
Pid: pid,
}
}
}