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moby--moby/docker/docker.go

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package main
import (
"flag"
"fmt"
"github.com/dotcloud/docker"
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"github.com/dotcloud/docker/utils"
"io/ioutil"
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"log"
"os"
"os/signal"
"strconv"
"strings"
"syscall"
)
var (
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GITCOMMIT string
)
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func main() {
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if utils.SelfPath() == "/sbin/init" {
// Running in init mode
docker.SysInit()
return
}
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host := "127.0.0.1"
port := 4243
// FIXME: Switch d and D ? (to be more sshd like)
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")
pidfile := flag.String("p", "/var/run/docker.pid", "File containing process PID")
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flHost := flag.String("H", fmt.Sprintf("%s:%d", host, port), "Host:port to bind/connect to")
flEnableCors := flag.Bool("api-enable-cors", false, "Enable CORS requests in the remote api.")
flag.Parse()
if *bridgeName != "" {
docker.NetworkBridgeIface = *bridgeName
} else {
docker.NetworkBridgeIface = docker.DefaultNetworkBridge
}
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if strings.Contains(*flHost, ":") {
hostParts := strings.Split(*flHost, ":")
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if len(hostParts) != 2 {
log.Fatal("Invalid bind address format.")
os.Exit(-1)
}
if hostParts[0] != "" {
host = hostParts[0]
}
if p, err := strconv.Atoi(hostParts[1]); err == nil {
port = p
}
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} else {
host = *flHost
}
if *flDebug {
os.Setenv("DEBUG", "1")
}
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docker.GITCOMMIT = GITCOMMIT
if *flDaemon {
if flag.NArg() != 0 {
flag.Usage()
return
}
if err := daemon(*pidfile, host, port, *flAutoRestart, *flEnableCors); err != nil {
log.Fatal(err)
os.Exit(-1)
}
} else {
if err := docker.ParseCommands(host, port, flag.Args()...); err != nil {
log.Fatal(err)
os.Exit(-1)
}
}
}
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, addr string, port int, autoRestart, enableCors bool) error {
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if addr != "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 /!\\")
}
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if err := createPidFile(pidfile); err != nil {
log.Fatal(err)
}
defer removePidFile(pidfile)
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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)
}()
server, err := docker.NewServer(autoRestart, enableCors)
if err != nil {
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return err
}
return docker.ListenAndServe(fmt.Sprintf("%s:%d", addr, port), server, true)
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}