| package main |
| |
| import ( |
| "flag" |
| "fmt" |
| "github.com/dotcloud/docker" |
| "github.com/dotcloud/docker/utils" |
| "io/ioutil" |
| "log" |
| "os" |
| "os/signal" |
| "strconv" |
| "strings" |
| "syscall" |
| ) |
| |
| var ( |
| GITCOMMIT string |
| VERSION string |
| ) |
| |
| func main() { |
| if selfPath := utils.SelfPath(); selfPath == "/sbin/init" || selfPath == "/.dockerinit" { |
| // Running in init mode |
| docker.SysInit() |
| return |
| } |
| // FIXME: Switch d and D ? (to be more sshd like) |
| flVersion := flag.Bool("v", false, "Print version information and quit") |
| flDaemon := flag.Bool("d", false, "Daemon mode") |
| flDebug := flag.Bool("D", false, "Debug mode") |
| flAutoRestart := flag.Bool("r", false, "Restart previously running containers") |
| bridgeName := flag.String("b", "", "Attach containers to a pre-existing network bridge. Use 'none' to disable container networking") |
| pidfile := flag.String("p", "/var/run/docker.pid", "File containing process PID") |
| flGraphPath := flag.String("g", "/var/lib/docker", "Path to graph storage base dir.") |
| flEnableCors := flag.Bool("api-enable-cors", false, "Enable CORS requests in the remote api.") |
| flDns := flag.String("dns", "", "Set custom dns servers") |
| flHosts := docker.ListOpts{fmt.Sprintf("unix://%s", docker.DEFAULTUNIXSOCKET)} |
| flag.Var(&flHosts, "H", "tcp://host:port to bind/connect to or unix://path/to/socket to use") |
| flag.Parse() |
| if *flVersion { |
| showVersion() |
| return |
| } |
| if len(flHosts) > 1 { |
| flHosts = flHosts[1:] //trick to display a nice default value in the usage |
| } |
| for i, flHost := range flHosts { |
| flHosts[i] = utils.ParseHost(docker.DEFAULTHTTPHOST, docker.DEFAULTHTTPPORT, flHost) |
| } |
| |
| if *bridgeName != "" { |
| docker.NetworkBridgeIface = *bridgeName |
| } else { |
| docker.NetworkBridgeIface = docker.DefaultNetworkBridge |
| } |
| if *flDebug { |
| os.Setenv("DEBUG", "1") |
| } |
| docker.GITCOMMIT = GITCOMMIT |
| docker.VERSION = VERSION |
| if *flDaemon { |
| if flag.NArg() != 0 { |
| flag.Usage() |
| return |
| } |
| if err := daemon(*pidfile, *flGraphPath, flHosts, *flAutoRestart, *flEnableCors, *flDns); err != nil { |
| log.Fatal(err) |
| os.Exit(-1) |
| } |
| } else { |
| if len(flHosts) > 1 { |
| log.Fatal("Please specify only one -H") |
| return |
| } |
| protoAddrParts := strings.SplitN(flHosts[0], "://", 2) |
| if err := docker.ParseCommands(protoAddrParts[0], protoAddrParts[1], flag.Args()...); err != nil { |
| if sterr, ok := err.(*utils.StatusError); ok { |
| os.Exit(sterr.Status) |
| } |
| log.Fatal(err) |
| os.Exit(-1) |
| } |
| } |
| } |
| |
| func showVersion() { |
| fmt.Printf("Docker version %s, build %s\n", VERSION, GITCOMMIT) |
| } |
| |
| func createPidFile(pidfile string) error { |
| if pidString, err := ioutil.ReadFile(pidfile); err == nil { |
| pid, err := strconv.Atoi(string(pidString)) |
| if err == nil { |
| if _, err := os.Stat(fmt.Sprintf("/proc/%d/", pid)); err == nil { |
| return fmt.Errorf("pid file found, ensure docker is not running or delete %s", pidfile) |
| } |
| } |
| } |
| |
| file, err := os.Create(pidfile) |
| if err != nil { |
| return err |
| } |
| |
| defer file.Close() |
| |
| _, err = fmt.Fprintf(file, "%d", os.Getpid()) |
| return err |
| } |
| |
| func removePidFile(pidfile string) { |
| if err := os.Remove(pidfile); err != nil { |
| log.Printf("Error removing %s: %s", pidfile, err) |
| } |
| } |
| |
| func daemon(pidfile string, flGraphPath string, protoAddrs []string, autoRestart, enableCors bool, flDns string) error { |
| if err := createPidFile(pidfile); err != nil { |
| log.Fatal(err) |
| } |
| defer removePidFile(pidfile) |
| |
| c := make(chan os.Signal, 1) |
| signal.Notify(c, os.Interrupt, os.Kill, os.Signal(syscall.SIGTERM)) |
| go func() { |
| sig := <-c |
| log.Printf("Received signal '%v', exiting\n", sig) |
| removePidFile(pidfile) |
| os.Exit(0) |
| }() |
| var dns []string |
| if flDns != "" { |
| dns = []string{flDns} |
| } |
| server, err := docker.NewServer(flGraphPath, autoRestart, enableCors, dns) |
| if err != nil { |
| return err |
| } |
| chErrors := make(chan error, len(protoAddrs)) |
| for _, protoAddr := range protoAddrs { |
| protoAddrParts := strings.SplitN(protoAddr, "://", 2) |
| if protoAddrParts[0] == "unix" { |
| syscall.Unlink(protoAddrParts[1]) |
| } else if protoAddrParts[0] == "tcp" { |
| if !strings.HasPrefix(protoAddrParts[1], "127.0.0.1") { |
| log.Println("/!\\ DON'T BIND ON ANOTHER IP ADDRESS THAN 127.0.0.1 IF YOU DON'T KNOW WHAT YOU'RE DOING /!\\") |
| } |
| } else { |
| log.Fatal("Invalid protocol format.") |
| os.Exit(-1) |
| } |
| go func() { |
| chErrors <- docker.ListenAndServe(protoAddrParts[0], protoAddrParts[1], server, true) |
| }() |
| } |
| for i := 0; i < len(protoAddrs); i += 1 { |
| err := <-chErrors |
| if err != nil { |
| return err |
| } |
| } |
| return nil |
| } |