blob: d3197e3c3068df15d2e3201c2f3a8a57ed242b77 [file] [log] [blame]
// +build !windows
package daemon
import (
"fmt"
"net"
"net/http"
"os"
"path/filepath"
"strings"
"syscall"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/autogen/dockerversion"
"github.com/docker/docker/daemon/graphdriver"
"github.com/docker/docker/pkg/archive"
"github.com/docker/docker/pkg/fileutils"
"github.com/docker/docker/pkg/nat"
"github.com/docker/docker/pkg/parsers"
"github.com/docker/docker/pkg/parsers/kernel"
"github.com/docker/docker/pkg/system"
"github.com/docker/docker/runconfig"
"github.com/docker/docker/utils"
volumedrivers "github.com/docker/docker/volume/drivers"
"github.com/docker/docker/volume/local"
"github.com/docker/libnetwork"
nwapi "github.com/docker/libnetwork/api"
nwconfig "github.com/docker/libnetwork/config"
"github.com/docker/libnetwork/netlabel"
"github.com/docker/libnetwork/options"
"github.com/opencontainers/runc/libcontainer/label"
)
func (daemon *Daemon) Changes(container *Container) ([]archive.Change, error) {
initID := fmt.Sprintf("%s-init", container.ID)
return daemon.driver.Changes(container.ID, initID)
}
func (daemon *Daemon) Diff(container *Container) (archive.Archive, error) {
initID := fmt.Sprintf("%s-init", container.ID)
return daemon.driver.Diff(container.ID, initID)
}
func parseSecurityOpt(container *Container, config *runconfig.HostConfig) error {
var (
labelOpts []string
err error
)
for _, opt := range config.SecurityOpt {
con := strings.SplitN(opt, ":", 2)
if len(con) == 1 {
return fmt.Errorf("Invalid --security-opt: %q", opt)
}
switch con[0] {
case "label":
labelOpts = append(labelOpts, con[1])
case "apparmor":
container.AppArmorProfile = con[1]
default:
return fmt.Errorf("Invalid --security-opt: %q", opt)
}
}
container.ProcessLabel, container.MountLabel, err = label.InitLabels(labelOpts)
return err
}
func (daemon *Daemon) createRootfs(container *Container) error {
// Step 1: create the container directory.
// This doubles as a barrier to avoid race conditions.
if err := os.Mkdir(container.root, 0700); err != nil {
return err
}
initID := fmt.Sprintf("%s-init", container.ID)
if err := daemon.driver.Create(initID, container.ImageID); err != nil {
return err
}
initPath, err := daemon.driver.Get(initID, "")
if err != nil {
return err
}
if err := setupInitLayer(initPath); err != nil {
daemon.driver.Put(initID)
return err
}
// We want to unmount init layer before we take snapshot of it
// for the actual container.
daemon.driver.Put(initID)
if err := daemon.driver.Create(container.ID, initID); err != nil {
return err
}
return nil
}
func checkKernel() error {
// Check for unsupported kernel versions
// FIXME: it would be cleaner to not test for specific versions, but rather
// test for specific functionalities.
// Unfortunately we can't test for the feature "does not cause a kernel panic"
// without actually causing a kernel panic, so we need this workaround until
// the circumstances of pre-3.10 crashes are clearer.
// For details see https://github.com/docker/docker/issues/407
if k, err := kernel.GetKernelVersion(); err != nil {
logrus.Warnf("%s", err)
} else {
if kernel.CompareKernelVersion(k, &kernel.KernelVersionInfo{Kernel: 3, Major: 10, Minor: 0}) < 0 {
if os.Getenv("DOCKER_NOWARN_KERNEL_VERSION") == "" {
logrus.Warnf("You are running linux kernel version %s, which might be unstable running docker. Please upgrade your kernel to 3.10.0.", k.String())
}
}
}
return nil
}
func (daemon *Daemon) verifyContainerSettings(hostConfig *runconfig.HostConfig, config *runconfig.Config) ([]string, error) {
var warnings []string
if config != nil {
// The check for a valid workdir path is made on the server rather than in the
// client. This is because we don't know the type of path (Linux or Windows)
// to validate on the client.
if config.WorkingDir != "" && !filepath.IsAbs(config.WorkingDir) {
return warnings, fmt.Errorf("The working directory '%s' is invalid. It needs to be an absolute path.", config.WorkingDir)
}
}
if hostConfig == nil {
return warnings, nil
}
for port := range hostConfig.PortBindings {
_, portStr := nat.SplitProtoPort(string(port))
if _, err := nat.ParsePort(portStr); err != nil {
return warnings, fmt.Errorf("Invalid port specification: %q", portStr)
}
for _, pb := range hostConfig.PortBindings[port] {
_, err := nat.NewPort(nat.SplitProtoPort(pb.HostPort))
if err != nil {
return warnings, fmt.Errorf("Invalid port specification: %q", pb.HostPort)
}
}
}
if hostConfig.LxcConf.Len() > 0 && !strings.Contains(daemon.ExecutionDriver().Name(), "lxc") {
return warnings, fmt.Errorf("Cannot use --lxc-conf with execdriver: %s", daemon.ExecutionDriver().Name())
}
if hostConfig.Memory != 0 && hostConfig.Memory < 4194304 {
return warnings, fmt.Errorf("Minimum memory limit allowed is 4MB")
}
if hostConfig.Memory > 0 && !daemon.SystemConfig().MemoryLimit {
warnings = append(warnings, "Your kernel does not support memory limit capabilities. Limitation discarded.")
logrus.Warnf("Your kernel does not support memory limit capabilities. Limitation discarded.")
hostConfig.Memory = 0
}
if hostConfig.Memory > 0 && hostConfig.MemorySwap != -1 && !daemon.SystemConfig().SwapLimit {
warnings = append(warnings, "Your kernel does not support swap limit capabilities, memory limited without swap.")
logrus.Warnf("Your kernel does not support swap limit capabilities, memory limited without swap.")
hostConfig.MemorySwap = -1
}
if hostConfig.Memory > 0 && hostConfig.MemorySwap > 0 && hostConfig.MemorySwap < hostConfig.Memory {
return warnings, fmt.Errorf("Minimum memoryswap limit should be larger than memory limit, see usage.")
}
if hostConfig.Memory == 0 && hostConfig.MemorySwap > 0 {
return warnings, fmt.Errorf("You should always set the Memory limit when using Memoryswap limit, see usage.")
}
if hostConfig.MemorySwappiness != -1 && !daemon.SystemConfig().MemorySwappiness {
warnings = append(warnings, "Your kernel does not support memory swappiness capabilities, memory swappiness discarded.")
logrus.Warnf("Your kernel does not support memory swappiness capabilities, memory swappiness discarded.")
hostConfig.MemorySwappiness = -1
}
if hostConfig.MemorySwappiness != -1 && (hostConfig.MemorySwappiness < 0 || hostConfig.MemorySwappiness > 100) {
return warnings, fmt.Errorf("Invalid value: %d, valid memory swappiness range is 0-100.", hostConfig.MemorySwappiness)
}
if hostConfig.CpuPeriod > 0 && !daemon.SystemConfig().CpuCfsPeriod {
warnings = append(warnings, "Your kernel does not support CPU cfs period. Period discarded.")
logrus.Warnf("Your kernel does not support CPU cfs period. Period discarded.")
hostConfig.CpuPeriod = 0
}
if hostConfig.CpuQuota > 0 && !daemon.SystemConfig().CpuCfsQuota {
warnings = append(warnings, "Your kernel does not support CPU cfs quota. Quota discarded.")
logrus.Warnf("Your kernel does not support CPU cfs quota. Quota discarded.")
hostConfig.CpuQuota = 0
}
if hostConfig.BlkioWeight > 0 && (hostConfig.BlkioWeight < 10 || hostConfig.BlkioWeight > 1000) {
return warnings, fmt.Errorf("Range of blkio weight is from 10 to 1000.")
}
if hostConfig.OomKillDisable && !daemon.SystemConfig().OomKillDisable {
hostConfig.OomKillDisable = false
return warnings, fmt.Errorf("Your kernel does not support oom kill disable.")
}
if daemon.SystemConfig().IPv4ForwardingDisabled {
warnings = append(warnings, "IPv4 forwarding is disabled. Networking will not work.")
logrus.Warnf("IPv4 forwarding is disabled. Networking will not work")
}
return warnings, nil
}
// checkConfigOptions checks for mutually incompatible config options
func checkConfigOptions(config *Config) error {
// Check for mutually incompatible config options
if config.Bridge.Iface != "" && config.Bridge.IP != "" {
return fmt.Errorf("You specified -b & --bip, mutually exclusive options. Please specify only one.")
}
if !config.Bridge.EnableIPTables && !config.Bridge.InterContainerCommunication {
return fmt.Errorf("You specified --iptables=false with --icc=false. ICC uses iptables to function. Please set --icc or --iptables to true.")
}
if !config.Bridge.EnableIPTables && config.Bridge.EnableIPMasq {
config.Bridge.EnableIPMasq = false
}
return nil
}
// checkSystem validates platform-specific requirements
func checkSystem() error {
if os.Geteuid() != 0 {
return fmt.Errorf("The Docker daemon needs to be run as root")
}
if err := checkKernel(); err != nil {
return err
}
return nil
}
// configureKernelSecuritySupport configures and validate security support for the kernel
func configureKernelSecuritySupport(config *Config, driverName string) error {
if config.EnableSelinuxSupport {
if selinuxEnabled() {
// As Docker on btrfs and SELinux are incompatible at present, error on both being enabled
if driverName == "btrfs" {
return fmt.Errorf("SELinux is not supported with the BTRFS graph driver")
}
logrus.Debug("SELinux enabled successfully")
} else {
logrus.Warn("Docker could not enable SELinux on the host system")
}
} else {
selinuxSetDisabled()
}
return nil
}
// MigrateIfDownlevel is a wrapper for AUFS migration for downlevel
func migrateIfDownlevel(driver graphdriver.Driver, root string) error {
return migrateIfAufs(driver, root)
}
func configureVolumes(config *Config) error {
volumesDriver, err := local.New(config.Root)
if err != nil {
return err
}
volumedrivers.Register(volumesDriver, volumesDriver.Name())
return nil
}
func configureSysInit(config *Config) (string, error) {
localCopy := filepath.Join(config.Root, "init", fmt.Sprintf("dockerinit-%s", dockerversion.VERSION))
sysInitPath := utils.DockerInitPath(localCopy)
if sysInitPath == "" {
return "", fmt.Errorf("Could not locate dockerinit: This usually means docker was built incorrectly. See https://docs.docker.com/contributing/devenvironment for official build instructions.")
}
if sysInitPath != localCopy {
// When we find a suitable dockerinit binary (even if it's our local binary), we copy it into config.Root at localCopy for future use (so that the original can go away without that being a problem, for example during a package upgrade).
if err := os.Mkdir(filepath.Dir(localCopy), 0700); err != nil && !os.IsExist(err) {
return "", err
}
if _, err := fileutils.CopyFile(sysInitPath, localCopy); err != nil {
return "", err
}
if err := os.Chmod(localCopy, 0700); err != nil {
return "", err
}
sysInitPath = localCopy
}
return sysInitPath, nil
}
func isBridgeNetworkDisabled(config *Config) bool {
return config.Bridge.Iface == disableNetworkBridge
}
func networkOptions(dconfig *Config) ([]nwconfig.Option, error) {
options := []nwconfig.Option{}
if dconfig == nil {
return options, nil
}
if strings.TrimSpace(dconfig.DefaultNetwork) != "" {
dn := strings.Split(dconfig.DefaultNetwork, ":")
if len(dn) < 2 {
return nil, fmt.Errorf("default network daemon config must be of the form NETWORKDRIVER:NETWORKNAME")
}
options = append(options, nwconfig.OptionDefaultDriver(dn[0]))
options = append(options, nwconfig.OptionDefaultNetwork(strings.Join(dn[1:], ":")))
} else {
dd := runconfig.DefaultDaemonNetworkMode()
dn := runconfig.DefaultDaemonNetworkMode().NetworkName()
options = append(options, nwconfig.OptionDefaultDriver(string(dd)))
options = append(options, nwconfig.OptionDefaultNetwork(dn))
}
if strings.TrimSpace(dconfig.NetworkKVStore) != "" {
kv := strings.Split(dconfig.NetworkKVStore, ":")
if len(kv) < 2 {
return nil, fmt.Errorf("kv store daemon config must be of the form KV-PROVIDER:KV-URL")
}
options = append(options, nwconfig.OptionKVProvider(kv[0]))
options = append(options, nwconfig.OptionKVProviderURL(strings.Join(kv[1:], ":")))
}
options = append(options, nwconfig.OptionLabels(dconfig.Labels))
return options, nil
}
func initNetworkController(config *Config) (libnetwork.NetworkController, error) {
netOptions, err := networkOptions(config)
if err != nil {
return nil, err
}
controller, err := libnetwork.New(netOptions...)
if err != nil {
return nil, fmt.Errorf("error obtaining controller instance: %v", err)
}
// Initialize default driver "null"
if err := controller.ConfigureNetworkDriver("null", options.Generic{}); err != nil {
return nil, fmt.Errorf("Error initializing null driver: %v", err)
}
// Initialize default network on "null"
if _, err := controller.NewNetwork("null", "none"); err != nil {
return nil, fmt.Errorf("Error creating default \"null\" network: %v", err)
}
// Initialize default driver "host"
if err := controller.ConfigureNetworkDriver("host", options.Generic{}); err != nil {
return nil, fmt.Errorf("Error initializing host driver: %v", err)
}
// Initialize default network on "host"
if _, err := controller.NewNetwork("host", "host"); err != nil {
return nil, fmt.Errorf("Error creating default \"host\" network: %v", err)
}
if !config.DisableBridge {
// Initialize default driver "bridge"
if err := initBridgeDriver(controller, config); err != nil {
return nil, err
}
}
return controller, nil
}
func initBridgeDriver(controller libnetwork.NetworkController, config *Config) error {
option := options.Generic{
"EnableIPForwarding": config.Bridge.EnableIPForward}
if err := controller.ConfigureNetworkDriver("bridge", options.Generic{netlabel.GenericData: option}); err != nil {
return fmt.Errorf("Error initializing bridge driver: %v", err)
}
netOption := options.Generic{
"BridgeName": config.Bridge.Iface,
"Mtu": config.Mtu,
"EnableIPTables": config.Bridge.EnableIPTables,
"EnableIPMasquerade": config.Bridge.EnableIPMasq,
"EnableICC": config.Bridge.InterContainerCommunication,
"EnableUserlandProxy": config.Bridge.EnableUserlandProxy,
}
if config.Bridge.IP != "" {
ip, bipNet, err := net.ParseCIDR(config.Bridge.IP)
if err != nil {
return err
}
bipNet.IP = ip
netOption["AddressIPv4"] = bipNet
}
if config.Bridge.FixedCIDR != "" {
_, fCIDR, err := net.ParseCIDR(config.Bridge.FixedCIDR)
if err != nil {
return err
}
netOption["FixedCIDR"] = fCIDR
}
if config.Bridge.FixedCIDRv6 != "" {
_, fCIDRv6, err := net.ParseCIDR(config.Bridge.FixedCIDRv6)
if err != nil {
return err
}
netOption["FixedCIDRv6"] = fCIDRv6
}
if config.Bridge.DefaultGatewayIPv4 != nil {
netOption["DefaultGatewayIPv4"] = config.Bridge.DefaultGatewayIPv4
}
if config.Bridge.DefaultGatewayIPv6 != nil {
netOption["DefaultGatewayIPv6"] = config.Bridge.DefaultGatewayIPv6
}
// --ip processing
if config.Bridge.DefaultIP != nil {
netOption["DefaultBindingIP"] = config.Bridge.DefaultIP
}
// Initialize default network on "bridge" with the same name
_, err := controller.NewNetwork("bridge", "bridge",
libnetwork.NetworkOptionGeneric(options.Generic{
netlabel.GenericData: netOption,
netlabel.EnableIPv6: config.Bridge.EnableIPv6,
}))
if err != nil {
return fmt.Errorf("Error creating default \"bridge\" network: %v", err)
}
return nil
}
// setupInitLayer populates a directory with mountpoints suitable
// for bind-mounting dockerinit into the container. The mountpoint is simply an
// empty file at /.dockerinit
//
// This extra layer is used by all containers as the top-most ro layer. It protects
// the container from unwanted side-effects on the rw layer.
func setupInitLayer(initLayer string) error {
for pth, typ := range map[string]string{
"/dev/pts": "dir",
"/dev/shm": "dir",
"/proc": "dir",
"/sys": "dir",
"/.dockerinit": "file",
"/.dockerenv": "file",
"/etc/resolv.conf": "file",
"/etc/hosts": "file",
"/etc/hostname": "file",
"/dev/console": "file",
"/etc/mtab": "/proc/mounts",
} {
parts := strings.Split(pth, "/")
prev := "/"
for _, p := range parts[1:] {
prev = filepath.Join(prev, p)
syscall.Unlink(filepath.Join(initLayer, prev))
}
if _, err := os.Stat(filepath.Join(initLayer, pth)); err != nil {
if os.IsNotExist(err) {
if err := system.MkdirAll(filepath.Join(initLayer, filepath.Dir(pth)), 0755); err != nil {
return err
}
switch typ {
case "dir":
if err := system.MkdirAll(filepath.Join(initLayer, pth), 0755); err != nil {
return err
}
case "file":
f, err := os.OpenFile(filepath.Join(initLayer, pth), os.O_CREATE, 0755)
if err != nil {
return err
}
f.Close()
default:
if err := os.Symlink(typ, filepath.Join(initLayer, pth)); err != nil {
return err
}
}
} else {
return err
}
}
}
// Layer is ready to use, if it wasn't before.
return nil
}
func (daemon *Daemon) NetworkApiRouter() func(w http.ResponseWriter, req *http.Request) {
return nwapi.NewHTTPHandler(daemon.netController)
}
func (daemon *Daemon) RegisterLinks(container *Container, hostConfig *runconfig.HostConfig) error {
if hostConfig == nil || hostConfig.Links == nil {
return nil
}
for _, l := range hostConfig.Links {
name, alias, err := parsers.ParseLink(l)
if err != nil {
return err
}
child, err := daemon.Get(name)
if err != nil {
//An error from daemon.Get() means this name could not be found
return fmt.Errorf("Could not get container for %s", name)
}
for child.hostConfig.NetworkMode.IsContainer() {
parts := strings.SplitN(string(child.hostConfig.NetworkMode), ":", 2)
child, err = daemon.Get(parts[1])
if err != nil {
return fmt.Errorf("Could not get container for %s", parts[1])
}
}
if child.hostConfig.NetworkMode.IsHost() {
return runconfig.ErrConflictHostNetworkAndLinks
}
if err := daemon.RegisterLink(container, child, alias); err != nil {
return err
}
}
// After we load all the links into the daemon
// set them to nil on the hostconfig
hostConfig.Links = nil
if err := container.WriteHostConfig(); err != nil {
return err
}
return nil
}