forked from containerd/containerd
/
main.go
234 lines (214 loc) · 6.18 KB
/
main.go
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/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package command
import (
gocontext "context"
"fmt"
"io/ioutil"
"net"
"os"
"os/signal"
"path/filepath"
"time"
"github.com/containerd/containerd/log"
"github.com/containerd/containerd/mount"
"github.com/containerd/containerd/services/server"
srvconfig "github.com/containerd/containerd/services/server/config"
"github.com/containerd/containerd/sys"
"github.com/containerd/containerd/version"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
"google.golang.org/grpc/grpclog"
)
const usage = `
__ _ __
_________ ____ / /_____ _(_)___ ___ _________/ /
/ ___/ __ \/ __ \/ __/ __ ` + "`" + `/ / __ \/ _ \/ ___/ __ /
/ /__/ /_/ / / / / /_/ /_/ / / / / / __/ / / /_/ /
\___/\____/_/ /_/\__/\__,_/_/_/ /_/\___/_/ \__,_/
high performance container runtime
`
func init() {
logrus.SetFormatter(&logrus.TextFormatter{
TimestampFormat: log.RFC3339NanoFixed,
FullTimestamp: true,
})
// Discard grpc logs so that they don't mess with our stdio
grpclog.SetLoggerV2(grpclog.NewLoggerV2(ioutil.Discard, ioutil.Discard, ioutil.Discard))
cli.VersionPrinter = func(c *cli.Context) {
fmt.Println(c.App.Name, version.Package, c.App.Version, version.Revision)
}
}
// App returns a *cli.App instance.
func App() *cli.App {
app := cli.NewApp()
app.Name = "containerd"
app.Version = version.Version
app.Usage = usage
app.Flags = []cli.Flag{
cli.StringFlag{
Name: "config,c",
Usage: "path to the configuration file",
Value: defaultConfigPath,
},
cli.StringFlag{
Name: "log-level,l",
Usage: "set the logging level [trace, debug, info, warn, error, fatal, panic]",
},
cli.StringFlag{
Name: "address,a",
Usage: "address for containerd's GRPC server",
},
cli.StringFlag{
Name: "root",
Usage: "containerd root directory",
},
cli.StringFlag{
Name: "state",
Usage: "containerd state directory",
},
}
app.Commands = []cli.Command{
configCommand,
publishCommand,
ociHook,
}
app.Action = func(context *cli.Context) error {
var (
start = time.Now()
signals = make(chan os.Signal, 2048)
serverC = make(chan *server.Server, 1)
ctx = gocontext.Background()
config = defaultConfig()
)
done := handleSignals(ctx, signals, serverC)
// start the signal handler as soon as we can to make sure that
// we don't miss any signals during boot
signal.Notify(signals, handledSignals...)
if err := srvconfig.LoadConfig(context.GlobalString("config"), config); err != nil && !os.IsNotExist(err) {
return err
}
// apply flags to the config
if err := applyFlags(context, config); err != nil {
return err
}
// cleanup temp mounts
if err := mount.SetTempMountLocation(filepath.Join(config.Root, "tmpmounts")); err != nil {
return errors.Wrap(err, "creating temp mount location")
}
// unmount all temp mounts on boot for the server
warnings, err := mount.CleanupTempMounts(0)
if err != nil {
log.G(ctx).WithError(err).Error("unmounting temp mounts")
}
for _, w := range warnings {
log.G(ctx).WithError(w).Warn("cleanup temp mount")
}
address := config.GRPC.Address
if address == "" {
return errors.New("grpc address cannot be empty")
}
log.G(ctx).WithFields(logrus.Fields{
"version": version.Version,
"revision": version.Revision,
}).Info("starting containerd")
server, err := server.New(ctx, config)
if err != nil {
return err
}
serverC <- server
if config.Debug.Address != "" {
var l net.Listener
if filepath.IsAbs(config.Debug.Address) {
if l, err = sys.GetLocalListener(config.Debug.Address, config.Debug.UID, config.Debug.GID); err != nil {
return errors.Wrapf(err, "failed to get listener for debug endpoint")
}
} else {
if l, err = net.Listen("tcp", config.Debug.Address); err != nil {
return errors.Wrapf(err, "failed to get listener for debug endpoint")
}
}
serve(ctx, l, server.ServeDebug)
}
if config.Metrics.Address != "" {
l, err := net.Listen("tcp", config.Metrics.Address)
if err != nil {
return errors.Wrapf(err, "failed to get listener for metrics endpoint")
}
serve(ctx, l, server.ServeMetrics)
}
l, err := sys.GetLocalListener(address, config.GRPC.UID, config.GRPC.GID)
if err != nil {
return errors.Wrapf(err, "failed to get listener for main endpoint")
}
serve(ctx, l, server.ServeGRPC)
log.G(ctx).Infof("containerd successfully booted in %fs", time.Since(start).Seconds())
<-done
return nil
}
return app
}
func serve(ctx gocontext.Context, l net.Listener, serveFunc func(net.Listener) error) {
path := l.Addr().String()
log.G(ctx).WithField("address", path).Info("serving...")
go func() {
defer l.Close()
if err := serveFunc(l); err != nil {
log.G(ctx).WithError(err).WithField("address", path).Fatal("serve failure")
}
}()
}
func applyFlags(context *cli.Context, config *srvconfig.Config) error {
// the order for config vs flag values is that flags will always override
// the config values if they are set
if err := setLevel(context, config); err != nil {
return err
}
for _, v := range []struct {
name string
d *string
}{
{
name: "root",
d: &config.Root,
},
{
name: "state",
d: &config.State,
},
{
name: "address",
d: &config.GRPC.Address,
},
} {
if s := context.GlobalString(v.name); s != "" {
*v.d = s
}
}
return nil
}
func setLevel(context *cli.Context, config *srvconfig.Config) error {
l := context.GlobalString("log-level")
if l == "" {
l = config.Debug.Level
}
if l != "" {
lvl, err := log.ParseLevel(l)
if err != nil {
return err
}
logrus.SetLevel(lvl)
}
return nil
}