mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
286 lines
11 KiB
Go
286 lines
11 KiB
Go
package main
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import (
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"crypto/tls"
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"crypto/x509"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"runtime"
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"strings"
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"github.com/dotcloud/docker/api"
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"github.com/dotcloud/docker/api/client"
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"github.com/dotcloud/docker/builtins"
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"github.com/dotcloud/docker/dockerversion"
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"github.com/dotcloud/docker/engine"
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"github.com/dotcloud/docker/opts"
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flag "github.com/dotcloud/docker/pkg/mflag"
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"github.com/dotcloud/docker/sysinit"
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"github.com/dotcloud/docker/utils"
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)
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const (
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defaultCaFile = "ca.pem"
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defaultKeyFile = "key.pem"
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defaultCertFile = "cert.pem"
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)
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var (
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dockerConfDir = os.Getenv("HOME") + "/.docker/"
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)
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func main() {
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if selfPath := utils.SelfPath(); strings.Contains(selfPath, ".dockerinit") {
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// Running in init mode
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sysinit.SysInit()
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return
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}
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var (
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flVersion = flag.Bool([]string{"v", "-version"}, false, "Print version information and quit")
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flDaemon = flag.Bool([]string{"d", "-daemon"}, false, "Enable daemon mode")
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flGraphOpts opts.ListOpts
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flDebug = flag.Bool([]string{"D", "-debug"}, false, "Enable debug mode")
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flAutoRestart = flag.Bool([]string{"r", "-restart"}, true, "Restart previously running containers")
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bridgeName = flag.String([]string{"b", "-bridge"}, "", "Attach containers to a pre-existing network bridge\nuse 'none' to disable container networking")
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bridgeIp = flag.String([]string{"#bip", "-bip"}, "", "Use this CIDR notation address for the network bridge's IP, not compatible with -b")
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pidfile = flag.String([]string{"p", "-pidfile"}, "/var/run/docker.pid", "Path to use for daemon PID file")
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flRoot = flag.String([]string{"g", "-graph"}, "/var/lib/docker", "Path to use as the root of the Docker runtime")
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flSocketGroup = flag.String([]string{"G", "-group"}, "docker", "Group to assign the unix socket specified by -H when running in daemon mode\nuse '' (the empty string) to disable setting of a group")
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flEnableCors = flag.Bool([]string{"#api-enable-cors", "-api-enable-cors"}, false, "Enable CORS headers in the remote API")
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flDns = opts.NewListOpts(opts.ValidateIp4Address)
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flDnsSearch = opts.NewListOpts(opts.ValidateDomain)
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flEnableIptables = flag.Bool([]string{"#iptables", "-iptables"}, true, "Enable Docker's addition of iptables rules")
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flEnableIpForward = flag.Bool([]string{"#ip-forward", "-ip-forward"}, true, "Enable net.ipv4.ip_forward")
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flDefaultIp = flag.String([]string{"#ip", "-ip"}, "0.0.0.0", "Default IP address to use when binding container ports")
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flInterContainerComm = flag.Bool([]string{"#icc", "-icc"}, true, "Enable inter-container communication")
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flGraphDriver = flag.String([]string{"s", "-storage-driver"}, "", "Force the Docker runtime to use a specific storage driver")
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flExecDriver = flag.String([]string{"e", "-exec-driver"}, "native", "Force the Docker runtime to use a specific exec driver")
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flHosts = opts.NewListOpts(api.ValidateHost)
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flMtu = flag.Int([]string{"#mtu", "-mtu"}, 0, "Set the containers network MTU\nif no value is provided: default to the default route MTU or 1500 if no default route is available")
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flTls = flag.Bool([]string{"-tls"}, false, "Use TLS; implied by tls-verify flags")
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flTlsVerify = flag.Bool([]string{"-tlsverify"}, false, "Use TLS and verify the remote (daemon: verify client, client: verify daemon)")
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flCa = flag.String([]string{"-tlscacert"}, dockerConfDir+defaultCaFile, "Trust only remotes providing a certificate signed by the CA given here")
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flCert = flag.String([]string{"-tlscert"}, dockerConfDir+defaultCertFile, "Path to TLS certificate file")
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flKey = flag.String([]string{"-tlskey"}, dockerConfDir+defaultKeyFile, "Path to TLS key file")
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flSelinuxEnabled = flag.Bool([]string{"-selinux-enabled"}, false, "Enable selinux support")
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)
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flag.Var(&flDns, []string{"#dns", "-dns"}, "Force Docker to use specific DNS servers")
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flag.Var(&flDnsSearch, []string{"-dns-search"}, "Force Docker to use specific DNS search domains")
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flag.Var(&flHosts, []string{"H", "-host"}, "The socket(s) to bind to in daemon mode\nspecified using one or more tcp://host:port, unix:///path/to/socket, fd://* or fd://socketfd.")
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flag.Var(&flGraphOpts, []string{"-storage-opt"}, "Set storage driver options")
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flag.Parse()
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if *flVersion {
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showVersion()
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return
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}
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if flHosts.Len() == 0 {
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defaultHost := os.Getenv("DOCKER_HOST")
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if defaultHost == "" || *flDaemon {
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// If we do not have a host, default to unix socket
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defaultHost = fmt.Sprintf("unix://%s", api.DEFAULTUNIXSOCKET)
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}
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if _, err := api.ValidateHost(defaultHost); err != nil {
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log.Fatal(err)
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}
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flHosts.Set(defaultHost)
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}
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if *bridgeName != "" && *bridgeIp != "" {
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log.Fatal("You specified -b & --bip, mutually exclusive options. Please specify only one.")
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}
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if !*flEnableIptables && !*flInterContainerComm {
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log.Fatal("You specified --iptables=false with --icc=false. ICC uses iptables to function. Please set --icc or --iptables to true.")
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}
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if *flDebug {
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os.Setenv("DEBUG", "1")
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}
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if *flDaemon {
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if runtime.GOOS != "linux" {
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log.Fatalf("The Docker daemon is only supported on linux")
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}
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if os.Geteuid() != 0 {
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log.Fatalf("The Docker daemon needs to be run as root")
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}
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if flag.NArg() != 0 {
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flag.Usage()
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return
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}
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// set up the TempDir to use a canonical path
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tmp := os.TempDir()
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realTmp, err := utils.ReadSymlinkedDirectory(tmp)
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if err != nil {
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log.Fatalf("Unable to get the full path to the TempDir (%s): %s", tmp, err)
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}
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os.Setenv("TMPDIR", realTmp)
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// get the canonical path to the Docker root directory
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root := *flRoot
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var realRoot string
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if _, err := os.Stat(root); err != nil && os.IsNotExist(err) {
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realRoot = root
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} else {
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realRoot, err = utils.ReadSymlinkedDirectory(root)
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if err != nil {
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log.Fatalf("Unable to get the full path to root (%s): %s", root, err)
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}
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}
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if err := checkKernelAndArch(); err != nil {
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log.Fatal(err)
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}
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eng := engine.New()
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// Load builtins
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if err := builtins.Register(eng); err != nil {
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log.Fatal(err)
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}
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// load the daemon in the background so we can immediately start
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// the http api so that connections don't fail while the daemon
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// is booting
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go func() {
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// Load plugin: httpapi
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job := eng.Job("initserver")
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job.Setenv("Pidfile", *pidfile)
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job.Setenv("Root", realRoot)
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job.SetenvBool("AutoRestart", *flAutoRestart)
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job.SetenvList("Dns", flDns.GetAll())
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job.SetenvList("DnsSearch", flDnsSearch.GetAll())
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job.SetenvBool("EnableIptables", *flEnableIptables)
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job.SetenvBool("EnableIpForward", *flEnableIpForward)
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job.Setenv("BridgeIface", *bridgeName)
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job.Setenv("BridgeIP", *bridgeIp)
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job.Setenv("DefaultIp", *flDefaultIp)
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job.SetenvBool("InterContainerCommunication", *flInterContainerComm)
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job.Setenv("GraphDriver", *flGraphDriver)
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job.SetenvList("GraphOptions", flGraphOpts.GetAll())
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job.Setenv("ExecDriver", *flExecDriver)
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job.SetenvInt("Mtu", *flMtu)
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job.SetenvBool("EnableSelinuxSupport", *flSelinuxEnabled)
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job.SetenvList("Sockets", flHosts.GetAll())
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if err := job.Run(); err != nil {
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log.Fatal(err)
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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
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if err := eng.Job("acceptconnections").Run(); err != nil {
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log.Fatal(err)
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}
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}()
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// TODO actually have a resolved graphdriver to show?
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log.Printf("docker daemon: %s %s; execdriver: %s; graphdriver: %s",
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dockerversion.VERSION,
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dockerversion.GITCOMMIT,
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*flExecDriver,
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*flGraphDriver)
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// Serve api
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job := eng.Job("serveapi", flHosts.GetAll()...)
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job.SetenvBool("Logging", true)
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job.SetenvBool("EnableCors", *flEnableCors)
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job.Setenv("Version", dockerversion.VERSION)
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job.Setenv("SocketGroup", *flSocketGroup)
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job.SetenvBool("Tls", *flTls)
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job.SetenvBool("TlsVerify", *flTlsVerify)
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job.Setenv("TlsCa", *flCa)
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job.Setenv("TlsCert", *flCert)
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job.Setenv("TlsKey", *flKey)
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job.SetenvBool("BufferRequests", true)
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if err := job.Run(); err != nil {
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log.Fatal(err)
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}
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} else {
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if flHosts.Len() > 1 {
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log.Fatal("Please specify only one -H")
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}
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protoAddrParts := strings.SplitN(flHosts.GetAll()[0], "://", 2)
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var (
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cli *client.DockerCli
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tlsConfig tls.Config
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)
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tlsConfig.InsecureSkipVerify = true
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// If we should verify the server, we need to load a trusted ca
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if *flTlsVerify {
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*flTls = true
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certPool := x509.NewCertPool()
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file, err := ioutil.ReadFile(*flCa)
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if err != nil {
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log.Fatalf("Couldn't read ca cert %s: %s", *flCa, err)
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}
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certPool.AppendCertsFromPEM(file)
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tlsConfig.RootCAs = certPool
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tlsConfig.InsecureSkipVerify = false
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}
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// If tls is enabled, try to load and send client certificates
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if *flTls || *flTlsVerify {
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_, errCert := os.Stat(*flCert)
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_, errKey := os.Stat(*flKey)
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if errCert == nil && errKey == nil {
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*flTls = true
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cert, err := tls.LoadX509KeyPair(*flCert, *flKey)
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if err != nil {
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log.Fatalf("Couldn't load X509 key pair: %s. Key encrypted?", err)
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}
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tlsConfig.Certificates = []tls.Certificate{cert}
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}
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}
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if *flTls || *flTlsVerify {
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cli = client.NewDockerCli(os.Stdin, os.Stdout, os.Stderr, protoAddrParts[0], protoAddrParts[1], &tlsConfig)
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} else {
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cli = client.NewDockerCli(os.Stdin, os.Stdout, os.Stderr, protoAddrParts[0], protoAddrParts[1], nil)
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}
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if err := cli.ParseCommands(flag.Args()...); err != nil {
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if sterr, ok := err.(*utils.StatusError); ok {
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if sterr.Status != "" {
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log.Println(sterr.Status)
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}
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os.Exit(sterr.StatusCode)
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}
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log.Fatal(err)
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}
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}
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}
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func showVersion() {
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fmt.Printf("Docker version %s, build %s\n", dockerversion.VERSION, dockerversion.GITCOMMIT)
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}
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func checkKernelAndArch() error {
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// Check for unsupported architectures
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if runtime.GOARCH != "amd64" {
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return fmt.Errorf("The Docker runtime currently only supports amd64 (not %s). This will change in the future. Aborting.", runtime.GOARCH)
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}
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// Check for unsupported kernel versions
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// FIXME: it would be cleaner to not test for specific versions, but rather
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// test for specific functionalities.
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// Unfortunately we can't test for the feature "does not cause a kernel panic"
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// without actually causing a kernel panic, so we need this workaround until
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// the circumstances of pre-3.8 crashes are clearer.
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// For details see http://github.com/dotcloud/docker/issues/407
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if k, err := utils.GetKernelVersion(); err != nil {
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log.Printf("WARNING: %s\n", err)
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} else {
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if utils.CompareKernelVersion(k, &utils.KernelVersionInfo{Kernel: 3, Major: 8, Minor: 0}) < 0 {
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if os.Getenv("DOCKER_NOWARN_KERNEL_VERSION") == "" {
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log.Printf("WARNING: You are running linux kernel version %s, which might be unstable running docker. Please upgrade your kernel to 3.8.0.", k.String())
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}
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}
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}
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return nil
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}
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