func daemon(context *cli.Context) error {
// setup a standard reaper so that we don't leave any zombies if we are still alive
// this is just good practice because we are spawning new processes
s := make(chan os.Signal, 2048)
signal.Notify(s, syscall.SIGCHLD, syscall.SIGTERM, syscall.SIGINT)
if err := osutils.SetSubreaper(1); err != nil {
logrus.WithField("error", err).Error("containerd: set subpreaper")
}
sv, err := supervisor.New(
context.String("state-dir"),
context.String("runtime"),
context.String("shim"),
context.StringSlice("runtime-args"),
context.Duration("start-timeout"),
context.Int("retain-count"))
if err != nil {
return err
}
wg := &sync.WaitGroup{}
for i := 0; i < 10; i++ {
wg.Add(1)
w := supervisor.NewWorker(sv, wg)
go w.Start()
}
if err := sv.Start(); err != nil {
return err
}
// Split the listen string of the form proto://addr
listenSpec := context.String("listen")
listenParts := strings.SplitN(listenSpec, "://", 2)
if len(listenParts) != 2 {
return fmt.Errorf("bad listen address format %s, expected proto://address", listenSpec)
}
server, err := startServer(listenParts[0], listenParts[1], sv)
if err != nil {
return err
}
for ss := range s {
switch ss {
case syscall.SIGCHLD:
if _, err := osutils.Reap(); err != nil {
logrus.WithField("error", err).Warn("containerd: reap child processes")
}
default:
logrus.Infof("stopping containerd after receiving %s", ss)
server.Stop()
os.Exit(0)
}
}
return nil
}
func daemon(context *cli.Context) error {
s := make(chan os.Signal, 2048)
signal.Notify(s, syscall.SIGTERM, syscall.SIGINT)
osutils.SetSubreaper(1)
sv, err := supervisor.New(
context.String("state-dir"),
context.String("runtime"),
context.String("shim"),
context.StringSlice("runtime-args"),
context.Duration("start-timeout"),
context.Int("retain-count"))
if err != nil {
return err
}
wg := &sync.WaitGroup{}
for i := 0; i < 10; i++ {
wg.Add(1)
w := supervisor.NewWorker(sv, wg)
go w.Start()
}
if err := sv.Start(); err != nil {
return err
}
// Split the listen string of the form proto://addr
listenSpec := context.String("listen")
listenParts := strings.SplitN(listenSpec, "://", 2)
if len(listenParts) != 2 {
return fmt.Errorf("bad listen address format %s, expected proto://address", listenSpec)
}
server, err := startServer(listenParts[0], listenParts[1], sv)
if err != nil {
return err
}
for ss := range s {
switch ss {
default:
logrus.Infof("stopping containerd after receiving %s", ss)
server.Stop()
os.Exit(0)
}
}
return nil
}
func daemon(address, stateDir string, concurrency int, runtimeName string, runtimeArgs []string, shimName string, timeout time.Duration) error {
// setup a standard reaper so that we don't leave any zombies if we are still alive
// this is just good practice because we are spawning new processes
s := make(chan os.Signal, 2048)
signal.Notify(s, syscall.SIGCHLD, syscall.SIGTERM, syscall.SIGINT)
if err := osutils.SetSubreaper(1); err != nil {
logrus.WithField("error", err).Error("containerd: set subpreaper")
}
sv, err := supervisor.New(stateDir, runtimeName, shimName, runtimeArgs, timeout)
if err != nil {
return err
}
wg := &sync.WaitGroup{}
for i := 0; i < concurrency; i++ {
wg.Add(1)
w := supervisor.NewWorker(sv, wg)
go w.Start()
}
if err := sv.Start(); err != nil {
return err
}
server, err := startServer(address, sv)
if err != nil {
return err
}
for ss := range s {
switch ss {
case syscall.SIGCHLD:
if _, err := osutils.Reap(); err != nil {
logrus.WithField("error", err).Warn("containerd: reap child processes")
}
default:
logrus.Infof("stopping containerd after receiving %s", ss)
server.Stop()
os.Exit(0)
}
}
return nil
}
func start(log *os.File) error {
// start handling signals as soon as possible so that things are properly reaped
// or if runtime exits before we hit the handler
signals := make(chan os.Signal, 2048)
signal.Notify(signals)
// set the shim as the subreaper for all orphaned processes created by the container
if err := osutils.SetSubreaper(1); err != nil {
return err
}
// open the exit pipe
f, err := os.OpenFile("exit", syscall.O_WRONLY, 0)
if err != nil {
return err
}
defer f.Close()
control, err := os.OpenFile("control", syscall.O_RDWR, 0)
if err != nil {
return err
}
defer control.Close()
p, err := newProcess(flag.Arg(0), flag.Arg(1), flag.Arg(2))
if err != nil {
return err
}
defer func() {
if err := p.Close(); err != nil {
writeMessage(log, "warn", err)
}
}()
if err := p.create(); err != nil {
p.delete()
return err
}
msgC := make(chan controlMessage, 32)
go func() {
for {
var m controlMessage
if _, err := fmt.Fscanf(control, "%d %d %d\n", &m.Type, &m.Width, &m.Height); err != nil {
continue
}
msgC <- m
}
}()
var exitShim bool
for {
select {
case s := <-signals:
switch s {
case syscall.SIGCHLD:
exits, _ := osutils.Reap()
for _, e := range exits {
// check to see if runtime is one of the processes that has exited
if e.Pid == p.pid() {
exitShim = true
writeInt("exitStatus", e.Status)
}
}
}
// runtime has exited so the shim can also exit
if exitShim {
// Let containerd take care of calling the runtime delete
f.Close()
p.Wait()
return nil
}
case msg := <-msgC:
switch msg.Type {
case 0:
// close stdin
if p.stdinCloser != nil {
p.stdinCloser.Close()
}
case 1:
if p.console == nil {
continue
}
ws := term.Winsize{
Width: uint16(msg.Width),
Height: uint16(msg.Height),
}
term.SetWinsize(p.console.Fd(), &ws)
}
}
}
return nil
}