forked from containerd/containerd
/
main.go
270 lines (255 loc) · 6.48 KB
/
main.go
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package main
import (
"fmt"
"log"
"net"
"os"
"os/signal"
"runtime"
"strings"
"sync"
"syscall"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/health"
"google.golang.org/grpc/health/grpc_health_v1"
"github.com/Sirupsen/logrus"
"github.com/codegangsta/cli"
"github.com/cyberdelia/go-metrics-graphite"
"github.com/docker/containerd"
"github.com/docker/containerd/api/grpc/server"
"github.com/docker/containerd/api/grpc/types"
"github.com/docker/containerd/api/http/pprof"
"github.com/docker/containerd/supervisor"
"github.com/docker/docker/pkg/listeners"
"github.com/rcrowley/go-metrics"
)
const (
usage = `High performance container daemon`
minRlimit = 1024
defaultStateDir = "/run/containerd"
defaultGRPCEndpoint = "unix:///run/containerd/containerd.sock"
)
var daemonFlags = []cli.Flag{
cli.BoolFlag{
Name: "debug",
Usage: "enable debug output in the logs",
},
cli.StringFlag{
Name: "state-dir",
Value: defaultStateDir,
Usage: "runtime state directory",
},
cli.DurationFlag{
Name: "metrics-interval",
Value: 5 * time.Minute,
Usage: "interval for flushing metrics to the store",
},
cli.StringFlag{
Name: "listen,l",
Value: defaultGRPCEndpoint,
Usage: "proto://address on which the GRPC API will listen",
},
cli.StringFlag{
Name: "runtime,r",
Value: "runc",
Usage: "name or path of the OCI compliant runtime to use when executing containers",
},
cli.StringSliceFlag{
Name: "runtime-args",
Value: &cli.StringSlice{},
Usage: "specify additional runtime args",
},
cli.StringFlag{
Name: "shim",
Value: "containerd-shim",
Usage: "Name or path of shim",
},
cli.StringFlag{
Name: "pprof-address",
Usage: "http address to listen for pprof events",
},
cli.DurationFlag{
Name: "start-timeout",
Value: 15 * time.Second,
Usage: "timeout duration for waiting on a container to start before it is killed",
},
cli.IntFlag{
Name: "retain-count",
Value: 500,
Usage: "number of past events to keep in the event log",
},
cli.StringFlag{
Name: "graphite-address",
Usage: "Address of graphite server",
},
}
// DumpStacks dumps the runtime stack.
func dumpStacks() {
var (
buf []byte
stackSize int
)
bufferLen := 16384
for stackSize == len(buf) {
buf = make([]byte, bufferLen)
stackSize = runtime.Stack(buf, true)
bufferLen *= 2
}
buf = buf[:stackSize]
logrus.Infof("=== BEGIN goroutine stack dump ===\n%s\n=== END goroutine stack dump ===", buf)
}
func setupDumpStacksTrap() {
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGUSR1)
go func() {
for range c {
dumpStacks()
}
}()
}
func main() {
logrus.SetFormatter(&logrus.TextFormatter{TimestampFormat: time.RFC3339Nano})
app := cli.NewApp()
app.Name = "containerd"
if containerd.GitCommit != "" {
app.Version = fmt.Sprintf("%s commit: %s", containerd.Version, containerd.GitCommit)
} else {
app.Version = containerd.Version
}
app.Usage = usage
app.Flags = daemonFlags
app.Before = func(context *cli.Context) error {
setupDumpStacksTrap()
if context.GlobalBool("debug") {
logrus.SetLevel(logrus.DebugLevel)
if context.GlobalDuration("metrics-interval") > 0 {
if err := debugMetrics(context.GlobalDuration("metrics-interval"), context.GlobalString("graphite-address")); err != nil {
return err
}
}
}
if p := context.GlobalString("pprof-address"); len(p) > 0 {
pprof.Enable(p)
}
if err := checkLimits(); err != nil {
return err
}
return nil
}
app.Action = func(context *cli.Context) {
if err := daemon(context); err != nil {
logrus.Fatal(err)
}
}
if err := app.Run(os.Args); err != nil {
logrus.Fatal(err)
}
}
func daemon(context *cli.Context) error {
s := make(chan os.Signal, 2048)
signal.Notify(s, syscall.SIGTERM, syscall.SIGINT)
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 startServer(protocol, address string, sv *supervisor.Supervisor) (*grpc.Server, error) {
// TODO: We should use TLS.
// TODO: Add an option for the SocketGroup.
sockets, err := listeners.Init(protocol, address, "", nil)
if err != nil {
return nil, err
}
if len(sockets) != 1 {
return nil, fmt.Errorf("incorrect number of listeners")
}
l := sockets[0]
s := grpc.NewServer()
types.RegisterAPIServer(s, server.NewServer(sv))
healthServer := health.NewHealthServer()
grpc_health_v1.RegisterHealthServer(s, healthServer)
go func() {
logrus.Debugf("containerd: grpc api on %s", address)
if err := s.Serve(l); err != nil {
logrus.WithField("error", err).Fatal("containerd: serve grpc")
}
}()
return s, nil
}
// getDefaultID returns the hostname for the instance host
func getDefaultID() string {
hostname, err := os.Hostname()
if err != nil {
panic(err)
}
return hostname
}
func checkLimits() error {
var l syscall.Rlimit
if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &l); err != nil {
return err
}
if l.Cur <= minRlimit {
logrus.WithFields(logrus.Fields{
"current": l.Cur,
"max": l.Max,
}).Warn("containerd: low RLIMIT_NOFILE changing to max")
l.Cur = l.Max
return syscall.Setrlimit(syscall.RLIMIT_NOFILE, &l)
}
return nil
}
func debugMetrics(interval time.Duration, graphiteAddr string) error {
for name, m := range supervisor.Metrics() {
if err := metrics.DefaultRegistry.Register(name, m); err != nil {
return err
}
}
processMetrics()
if graphiteAddr != "" {
addr, err := net.ResolveTCPAddr("tcp", graphiteAddr)
if err != nil {
return err
}
go graphite.Graphite(metrics.DefaultRegistry, 10e9, "metrics", addr)
} else {
l := log.New(os.Stdout, "[containerd] ", log.LstdFlags)
go metrics.Log(metrics.DefaultRegistry, interval, l)
}
return nil
}