377 lines
8.9 KiB
Go
377 lines
8.9 KiB
Go
package main
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import (
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_ "expvar"
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"fmt"
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"net/http"
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_ "net/http/pprof"
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"os"
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"os/signal"
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"path/filepath"
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"syscall"
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"time"
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gocontext "golang.org/x/net/context"
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"google.golang.org/grpc"
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"github.com/Sirupsen/logrus"
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"github.com/docker/containerd"
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contentapi "github.com/docker/containerd/api/services/content"
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api "github.com/docker/containerd/api/services/execution"
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"github.com/docker/containerd/content"
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"github.com/docker/containerd/log"
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"github.com/docker/containerd/plugin"
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"github.com/docker/containerd/reaper"
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"github.com/docker/containerd/snapshot"
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"github.com/docker/containerd/utils"
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metrics "github.com/docker/go-metrics"
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"github.com/pkg/errors"
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"github.com/urfave/cli"
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)
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const usage = `
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__ _ __
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_________ ____ / /_____ _(_)___ ___ _________/ /
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/ ___/ __ \/ __ \/ __/ __ ` + "`" + `/ / __ \/ _ \/ ___/ __ /
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/ /__/ /_/ / / / / /_/ /_/ / / / / / __/ / / /_/ /
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\___/\____/_/ /_/\__/\__,_/_/_/ /_/\___/_/ \__,_/
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high performance container runtime
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`
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var (
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conf = defaultConfig()
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global = log.WithModule(gocontext.Background(), "containerd")
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)
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func init() {
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cli.VersionPrinter = func(c *cli.Context) {
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fmt.Println(c.App.Name, containerd.Package, c.App.Version)
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}
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}
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func main() {
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app := cli.NewApp()
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app.Name = "containerd"
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app.Version = containerd.Version
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app.Usage = usage
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app.Flags = []cli.Flag{
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cli.StringFlag{
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Name: "config,c",
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Usage: "path to the configuration file",
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Value: "/etc/containerd/config.toml",
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},
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cli.StringFlag{
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Name: "log-level,l",
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Usage: "set the logging level [debug, info, warn, error, fatal, panic]",
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},
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cli.StringFlag{
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Name: "state",
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Usage: "containerd state directory",
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},
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cli.StringFlag{
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Name: "socket,s",
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Usage: "socket path for containerd's GRPC server",
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},
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cli.StringFlag{
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Name: "root",
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Usage: "containerd root directory",
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},
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}
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app.Before = before
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app.Action = func(context *cli.Context) error {
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start := time.Now()
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// start the signal handler as soon as we can to make sure that
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// we don't miss any signals during boot
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signals := make(chan os.Signal, 2048)
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signal.Notify(signals, syscall.SIGTERM, syscall.SIGINT, syscall.SIGUSR1, syscall.SIGCHLD)
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log.G(global).Info("starting containerd boot...")
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// load all plugins into containerd
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if err := plugin.Load(filepath.Join(conf.Root, "plugins")); err != nil {
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return err
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}
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// start debug and metrics APIs
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if err := serveDebugAPI(); err != nil {
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return err
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}
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runtimes, err := loadRuntimes()
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if err != nil {
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return err
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}
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store, err := resolveContentStore()
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if err != nil {
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return err
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}
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snapshotter, err := loadSnapshotter(store)
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if err != nil {
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return err
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}
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services, err := loadServices(runtimes, store, snapshotter)
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if err != nil {
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return err
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}
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// start the GRPC api with the execution service registered
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server := newGRPCServer()
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for _, service := range services {
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if err := service.Register(server); err != nil {
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return err
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}
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}
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if err := serveGRPC(server); err != nil {
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return err
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}
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// start the prometheus metrics API for containerd
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serveMetricsAPI()
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log.G(global).Infof("containerd successfully booted in %fs", time.Now().Sub(start).Seconds())
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return handleSignals(signals, server)
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}
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if err := app.Run(os.Args); err != nil {
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fmt.Fprintf(os.Stderr, "containerd: %s\n", err)
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os.Exit(1)
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}
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}
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func before(context *cli.Context) error {
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if err := loadConfig(context.GlobalString("config")); err != nil &&
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!os.IsNotExist(err) {
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return err
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}
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// the order for config vs flag values is that flags will always override
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// the config values if they are set
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if err := setLevel(context); err != nil {
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return err
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}
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for _, v := range []struct {
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name string
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d *string
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}{
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{
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name: "root",
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d: &conf.Root,
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},
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{
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name: "state",
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d: &conf.State,
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},
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{
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name: "socket",
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d: &conf.GRPC.Socket,
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},
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} {
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if s := context.GlobalString(v.name); s != "" {
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*v.d = s
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}
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}
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return nil
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}
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func setLevel(context *cli.Context) error {
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l := context.GlobalString("log-level")
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if l == "" {
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l = conf.Debug.Level
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}
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if l != "" {
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lvl, err := logrus.ParseLevel(l)
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if err != nil {
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return err
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}
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logrus.SetLevel(lvl)
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}
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return nil
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}
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func serveMetricsAPI() {
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if conf.Metrics.Address != "" {
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log.G(global).WithField("metrics", conf.Metrics.Address).Info("starting metrics API...")
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h := newMetricsHandler()
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go func() {
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if err := http.ListenAndServe(conf.Metrics.Address, h); err != nil {
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log.G(global).WithError(err).Fatal("serve metrics API")
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}
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}()
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}
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}
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func newMetricsHandler() http.Handler {
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m := http.NewServeMux()
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m.Handle("/metrics", metrics.Handler())
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return m
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}
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func serveDebugAPI() error {
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path := conf.Debug.Socket
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if path == "" {
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return errors.New("debug socket path cannot be empty")
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}
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l, err := utils.CreateUnixSocket(path)
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if err != nil {
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return err
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}
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log.G(global).WithField("debug", path).Info("starting debug API...")
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go func() {
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defer l.Close()
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// pprof and expvars are imported and automatically register their endpoints
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// under /debug
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if err := http.Serve(l, nil); err != nil {
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log.G(global).WithError(err).Fatal("serve debug API")
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}
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}()
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return nil
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}
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func resolveContentStore() (*content.Store, error) {
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cp := filepath.Join(conf.Root, "content")
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return content.NewStore(cp)
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}
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func loadRuntimes() (map[string]containerd.Runtime, error) {
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o := make(map[string]containerd.Runtime)
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for name, rr := range plugin.Registrations() {
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if rr.Type != plugin.RuntimePlugin {
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continue
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}
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log.G(global).Infof("loading runtime plugin %q...", name)
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ic := &plugin.InitContext{
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Root: conf.Root,
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State: conf.State,
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Context: log.WithModule(global, fmt.Sprintf("runtime-%s", name)),
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}
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if rr.Config != nil {
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if err := conf.decodePlugin(name, rr.Config); err != nil {
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return nil, err
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}
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ic.Config = rr.Config
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}
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vr, err := rr.Init(ic)
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if err != nil {
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return nil, err
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}
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o[name] = vr.(containerd.Runtime)
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}
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return o, nil
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}
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func loadSnapshotter(store *content.Store) (snapshot.Snapshotter, error) {
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for name, sr := range plugin.Registrations() {
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if sr.Type != plugin.SnapshotPlugin {
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continue
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}
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moduleName := fmt.Sprintf("snapshot-%s", conf.Snapshotter)
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if name != moduleName {
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continue
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}
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log.G(global).Infof("loading snapshot plugin %q...", name)
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ic := &plugin.InitContext{
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Root: conf.Root,
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State: conf.State,
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Store: store,
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Context: log.WithModule(global, moduleName),
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}
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if sr.Config != nil {
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if err := conf.decodePlugin(name, sr.Config); err != nil {
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return nil, err
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}
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ic.Config = sr.Config
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}
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sn, err := sr.Init(ic)
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if err != nil {
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return nil, err
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}
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return sn.(snapshot.Snapshotter), nil
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}
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return nil, fmt.Errorf("snapshotter not loaded: %v", conf.Snapshotter)
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}
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func newGRPCServer() *grpc.Server {
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s := grpc.NewServer(grpc.UnaryInterceptor(interceptor))
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return s
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}
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func loadServices(runtimes map[string]containerd.Runtime, store *content.Store, sn snapshot.Snapshotter) ([]plugin.Service, error) {
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var o []plugin.Service
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for name, sr := range plugin.Registrations() {
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if sr.Type != plugin.GRPCPlugin {
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continue
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}
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log.G(global).Infof("loading grpc service plugin %q...", name)
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ic := &plugin.InitContext{
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Root: conf.Root,
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State: conf.State,
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Context: log.WithModule(global, fmt.Sprintf("service-%s", name)),
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Runtimes: runtimes,
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Store: store,
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Snapshotter: sn,
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}
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if sr.Config != nil {
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if err := conf.decodePlugin(name, sr.Config); err != nil {
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return nil, err
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}
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ic.Config = sr.Config
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}
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vs, err := sr.Init(ic)
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if err != nil {
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return nil, err
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}
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o = append(o, vs.(plugin.Service))
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}
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return o, nil
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}
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func serveGRPC(server *grpc.Server) error {
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path := conf.GRPC.Socket
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if path == "" {
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return errors.New("--socket path cannot be empty")
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}
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l, err := utils.CreateUnixSocket(path)
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if err != nil {
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return err
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}
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if err := os.Chown(path, conf.GRPC.Uid, conf.GRPC.Gid); err != nil {
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return err
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}
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go func() {
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defer l.Close()
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if err := server.Serve(l); err != nil {
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log.G(global).WithError(err).Fatal("serve GRPC")
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}
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}()
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return nil
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}
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func interceptor(ctx gocontext.Context,
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req interface{},
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info *grpc.UnaryServerInfo,
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handler grpc.UnaryHandler,
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) (interface{}, error) {
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ctx = log.WithModule(ctx, "containerd")
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switch info.Server.(type) {
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case api.ContainerServiceServer:
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ctx = log.WithModule(ctx, "execution")
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case contentapi.ContentServer:
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ctx = log.WithModule(ctx, "content")
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default:
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fmt.Printf("unknown GRPC server type: %#v\n", info.Server)
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}
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return handler(ctx, req)
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}
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func handleSignals(signals chan os.Signal, server *grpc.Server) error {
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for s := range signals {
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log.G(global).WithField("signal", s).Debug("received signal")
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switch s {
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case syscall.SIGCHLD:
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if _, err := reaper.Reap(); err != nil {
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log.G(global).WithError(err).Error("reap containerd processes")
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}
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default:
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server.Stop()
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return nil
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}
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}
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return nil
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}
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