mirror of
https://github.com/moby/moby.git
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318 lines
8.8 KiB
Go
318 lines
8.8 KiB
Go
// +build daemon
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package main
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import (
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"crypto/tls"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"strings"
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"time"
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"github.com/Sirupsen/logrus"
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"github.com/docker/distribution/uuid"
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apiserver "github.com/docker/docker/api/server"
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"github.com/docker/docker/autogen/dockerversion"
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"github.com/docker/docker/cli"
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"github.com/docker/docker/cliconfig"
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"github.com/docker/docker/daemon"
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"github.com/docker/docker/daemon/logger"
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"github.com/docker/docker/opts"
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flag "github.com/docker/docker/pkg/mflag"
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"github.com/docker/docker/pkg/pidfile"
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"github.com/docker/docker/pkg/signal"
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"github.com/docker/docker/pkg/system"
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"github.com/docker/docker/pkg/timeutils"
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"github.com/docker/docker/pkg/tlsconfig"
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"github.com/docker/docker/registry"
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"github.com/docker/docker/utils"
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)
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const daemonUsage = " docker daemon [ --help | ... ]\n"
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var (
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flDaemon = flag.Bool([]string{"#d", "#-daemon"}, false, "Enable daemon mode (deprecated; use docker daemon)")
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daemonCli cli.Handler = NewDaemonCli()
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)
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// TODO: remove once `-d` is retired
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func handleGlobalDaemonFlag() {
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// This block makes sure that if the deprecated daemon flag `--daemon` is absent,
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// then all daemon-specific flags are absent as well.
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if !*flDaemon && daemonFlags != nil {
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flag.CommandLine.Visit(func(fl *flag.Flag) {
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for _, name := range fl.Names {
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name := strings.TrimPrefix(name, "#")
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if daemonFlags.Lookup(name) != nil {
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// daemon flag was NOT specified, but daemon-specific flags were
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// so let's error out
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fmt.Fprintf(os.Stderr, "docker: the daemon flag '-%s' must follow the 'docker daemon' command.\n", name)
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os.Exit(1)
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}
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}
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})
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}
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if *flDaemon {
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if *flHelp {
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// We do not show the help output here, instead, we tell the user about the new daemon command,
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// because the help output is so long they would not see the warning anyway.
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fmt.Fprintln(os.Stderr, "Please use 'docker daemon --help' instead.")
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os.Exit(0)
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}
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daemonCli.(*DaemonCli).CmdDaemon(flag.Args()...)
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os.Exit(0)
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}
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}
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func presentInHelp(usage string) string { return usage }
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func absentFromHelp(string) string { return "" }
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// NewDaemonCli returns a pre-configured daemon CLI
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func NewDaemonCli() *DaemonCli {
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daemonFlags = cli.Subcmd("daemon", nil, "Enable daemon mode", true)
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// TODO(tiborvass): remove InstallFlags?
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daemonConfig := new(daemon.Config)
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daemonConfig.LogConfig.Config = make(map[string]string)
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daemonConfig.InstallFlags(daemonFlags, presentInHelp)
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daemonConfig.InstallFlags(flag.CommandLine, absentFromHelp)
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registryOptions := new(registry.Options)
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registryOptions.InstallFlags(daemonFlags, presentInHelp)
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registryOptions.InstallFlags(flag.CommandLine, absentFromHelp)
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daemonFlags.Require(flag.Exact, 0)
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return &DaemonCli{
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Config: daemonConfig,
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registryOptions: registryOptions,
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}
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}
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func migrateKey() (err error) {
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// Migrate trust key if exists at ~/.docker/key.json and owned by current user
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oldPath := filepath.Join(cliconfig.ConfigDir(), defaultTrustKeyFile)
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newPath := filepath.Join(getDaemonConfDir(), defaultTrustKeyFile)
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if _, statErr := os.Stat(newPath); os.IsNotExist(statErr) && currentUserIsOwner(oldPath) {
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defer func() {
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// Ensure old path is removed if no error occurred
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if err == nil {
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err = os.Remove(oldPath)
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} else {
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logrus.Warnf("Key migration failed, key file not removed at %s", oldPath)
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os.Remove(newPath)
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}
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}()
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if err := system.MkdirAll(getDaemonConfDir(), os.FileMode(0644)); err != nil {
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return fmt.Errorf("Unable to create daemon configuration directory: %s", err)
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}
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newFile, err := os.OpenFile(newPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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return fmt.Errorf("error creating key file %q: %s", newPath, err)
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}
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defer newFile.Close()
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oldFile, err := os.Open(oldPath)
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if err != nil {
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return fmt.Errorf("error opening key file %q: %s", oldPath, err)
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}
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defer oldFile.Close()
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if _, err := io.Copy(newFile, oldFile); err != nil {
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return fmt.Errorf("error copying key: %s", err)
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}
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logrus.Infof("Migrated key from %s to %s", oldPath, newPath)
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}
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return nil
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}
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// DaemonCli represents the daemon CLI.
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type DaemonCli struct {
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*daemon.Config
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registryOptions *registry.Options
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}
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func getGlobalFlag() (globalFlag *flag.Flag) {
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defer func() {
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if x := recover(); x != nil {
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switch f := x.(type) {
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case *flag.Flag:
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globalFlag = f
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default:
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panic(x)
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}
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}
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}()
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visitor := func(f *flag.Flag) { panic(f) }
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commonFlags.FlagSet.Visit(visitor)
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clientFlags.FlagSet.Visit(visitor)
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return
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}
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// CmdDaemon is the daemon command, called the raw arguments after `docker daemon`.
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func (cli *DaemonCli) CmdDaemon(args ...string) error {
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// warn from uuid package when running the daemon
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uuid.Loggerf = logrus.Warnf
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if *flDaemon {
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// allow legacy forms `docker -D -d` and `docker -d -D`
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logrus.Warn("please use 'docker daemon' instead.")
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} else if !commonFlags.FlagSet.IsEmpty() || !clientFlags.FlagSet.IsEmpty() {
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// deny `docker -D daemon`
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illegalFlag := getGlobalFlag()
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fmt.Fprintf(os.Stderr, "invalid flag '-%s'.\nSee 'docker daemon --help'.\n", illegalFlag.Names[0])
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os.Exit(1)
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} else {
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// allow new form `docker daemon -D`
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flag.Merge(daemonFlags, commonFlags.FlagSet)
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}
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daemonFlags.ParseFlags(args, true)
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commonFlags.PostParse()
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if len(commonFlags.Hosts) == 0 {
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commonFlags.Hosts = []string{opts.DefaultHost}
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}
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if commonFlags.TrustKey == "" {
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commonFlags.TrustKey = filepath.Join(getDaemonConfDir(), defaultTrustKeyFile)
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}
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if utils.ExperimentalBuild() {
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logrus.Warn("Running experimental build")
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}
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logrus.SetFormatter(&logrus.TextFormatter{TimestampFormat: timeutils.RFC3339NanoFixed})
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if err := setDefaultUmask(); err != nil {
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logrus.Fatalf("Failed to set umask: %v", err)
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}
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if len(cli.LogConfig.Config) > 0 {
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if err := logger.ValidateLogOpts(cli.LogConfig.Type, cli.LogConfig.Config); err != nil {
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logrus.Fatalf("Failed to set log opts: %v", err)
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}
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}
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var pfile *pidfile.PIDFile
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if cli.Pidfile != "" {
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pf, err := pidfile.New(cli.Pidfile)
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if err != nil {
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logrus.Fatalf("Error starting daemon: %v", err)
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}
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pfile = pf
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defer func() {
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if err := pfile.Remove(); err != nil {
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logrus.Error(err)
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}
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}()
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}
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serverConfig := &apiserver.Config{
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Logging: true,
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Version: dockerversion.VERSION,
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}
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serverConfig = setPlatformServerConfig(serverConfig, cli.Config)
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if commonFlags.TLSOptions != nil {
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if !commonFlags.TLSOptions.InsecureSkipVerify {
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// server requires and verifies client's certificate
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commonFlags.TLSOptions.ClientAuth = tls.RequireAndVerifyClientCert
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}
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tlsConfig, err := tlsconfig.Server(*commonFlags.TLSOptions)
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if err != nil {
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logrus.Fatal(err)
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}
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serverConfig.TLSConfig = tlsConfig
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}
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api := apiserver.New(serverConfig)
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// The serve API routine never exits unless an error occurs
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// We need to start it as a goroutine and wait on it so
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// daemon doesn't exit
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serveAPIWait := make(chan error)
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go func() {
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if err := api.ServeAPI(commonFlags.Hosts); err != nil {
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logrus.Errorf("ServeAPI error: %v", err)
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serveAPIWait <- err
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return
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}
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serveAPIWait <- nil
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}()
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if err := migrateKey(); err != nil {
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logrus.Fatal(err)
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}
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cli.TrustKeyPath = commonFlags.TrustKey
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registryService := registry.NewService(cli.registryOptions)
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d, err := daemon.NewDaemon(cli.Config, registryService)
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if err != nil {
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if pfile != nil {
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if err := pfile.Remove(); err != nil {
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logrus.Error(err)
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}
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}
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logrus.Fatalf("Error starting daemon: %v", err)
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}
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logrus.Info("Daemon has completed initialization")
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logrus.WithFields(logrus.Fields{
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"version": dockerversion.VERSION,
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"commit": dockerversion.GITCOMMIT,
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"execdriver": d.ExecutionDriver().Name(),
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"graphdriver": d.GraphDriver().String(),
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}).Info("Docker daemon")
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signal.Trap(func() {
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api.Close()
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<-serveAPIWait
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shutdownDaemon(d, 15)
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if pfile != nil {
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if err := pfile.Remove(); err != nil {
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logrus.Error(err)
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}
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}
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})
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// after the daemon is done setting up we can tell the api to start
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// accepting connections with specified daemon
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api.AcceptConnections(d)
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// Daemon is fully initialized and handling API traffic
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// Wait for serve API to complete
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errAPI := <-serveAPIWait
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shutdownDaemon(d, 15)
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if errAPI != nil {
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if pfile != nil {
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if err := pfile.Remove(); err != nil {
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logrus.Error(err)
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}
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}
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logrus.Fatalf("Shutting down due to ServeAPI error: %v", errAPI)
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}
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return nil
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}
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// shutdownDaemon just wraps daemon.Shutdown() to handle a timeout in case
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// d.Shutdown() is waiting too long to kill container or worst it's
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// blocked there
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func shutdownDaemon(d *daemon.Daemon, timeout time.Duration) {
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ch := make(chan struct{})
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go func() {
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d.Shutdown()
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close(ch)
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}()
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select {
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case <-ch:
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logrus.Debug("Clean shutdown succeeded")
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case <-time.After(timeout * time.Second):
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logrus.Error("Force shutdown daemon")
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}
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}
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