| // +build linux freebsd |
| |
| package daemon |
| |
| import ( |
| "fmt" |
| "net" |
| "os" |
| "path/filepath" |
| "strconv" |
| "strings" |
| "syscall" |
| |
| "github.com/Sirupsen/logrus" |
| "github.com/docker/docker/autogen/dockerversion" |
| "github.com/docker/docker/daemon/graphdriver" |
| derr "github.com/docker/docker/errors" |
| "github.com/docker/docker/pkg/fileutils" |
| "github.com/docker/docker/pkg/idtools" |
| "github.com/docker/docker/pkg/parsers" |
| "github.com/docker/docker/pkg/parsers/kernel" |
| "github.com/docker/docker/pkg/sysinfo" |
| "github.com/docker/docker/runconfig" |
| "github.com/docker/docker/utils" |
| "github.com/docker/libnetwork" |
| nwconfig "github.com/docker/libnetwork/config" |
| "github.com/docker/libnetwork/drivers/bridge" |
| "github.com/docker/libnetwork/ipamutils" |
| "github.com/docker/libnetwork/netlabel" |
| "github.com/docker/libnetwork/options" |
| "github.com/docker/libnetwork/types" |
| "github.com/opencontainers/runc/libcontainer/label" |
| "github.com/vishvananda/netlink" |
| ) |
| |
| const ( |
| // See https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/tree/kernel/sched/sched.h?id=8cd9234c64c584432f6992fe944ca9e46ca8ea76#n269 |
| linuxMinCPUShares = 2 |
| linuxMaxCPUShares = 262144 |
| platformSupported = true |
| ) |
| |
| 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 checkKernelVersion(k, major, minor int) bool { |
| if v, err := kernel.GetKernelVersion(); err != nil { |
| logrus.Warnf("%s", err) |
| } else { |
| if kernel.CompareKernelVersion(*v, kernel.VersionInfo{Kernel: k, Major: major, Minor: minor}) < 0 { |
| return false |
| } |
| } |
| return true |
| } |
| |
| 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 !checkKernelVersion(3, 10, 0) { |
| v, _ := kernel.GetKernelVersion() |
| if os.Getenv("DOCKER_NOWARN_KERNEL_VERSION") == "" { |
| logrus.Warnf("Your Linux kernel version %s can be unstable running docker. Please upgrade your kernel to 3.10.0.", v.String()) |
| } |
| } |
| return nil |
| } |
| |
| // adaptContainerSettings is called during container creation to modify any |
| // settings necessary in the HostConfig structure. |
| func (daemon *Daemon) adaptContainerSettings(hostConfig *runconfig.HostConfig, adjustCPUShares bool) { |
| if hostConfig == nil { |
| return |
| } |
| |
| if adjustCPUShares && hostConfig.CPUShares > 0 { |
| // Handle unsupported CPUShares |
| if hostConfig.CPUShares < linuxMinCPUShares { |
| logrus.Warnf("Changing requested CPUShares of %d to minimum allowed of %d", hostConfig.CPUShares, linuxMinCPUShares) |
| hostConfig.CPUShares = linuxMinCPUShares |
| } else if hostConfig.CPUShares > linuxMaxCPUShares { |
| logrus.Warnf("Changing requested CPUShares of %d to maximum allowed of %d", hostConfig.CPUShares, linuxMaxCPUShares) |
| hostConfig.CPUShares = linuxMaxCPUShares |
| } |
| } |
| if hostConfig.Memory > 0 && hostConfig.MemorySwap == 0 { |
| // By default, MemorySwap is set to twice the size of Memory. |
| hostConfig.MemorySwap = hostConfig.Memory * 2 |
| } |
| if hostConfig.MemoryReservation == 0 && hostConfig.Memory > 0 { |
| hostConfig.MemoryReservation = hostConfig.Memory |
| } |
| } |
| |
| // verifyPlatformContainerSettings performs platform-specific validation of the |
| // hostconfig and config structures. |
| func verifyPlatformContainerSettings(daemon *Daemon, hostConfig *runconfig.HostConfig, config *runconfig.Config) ([]string, error) { |
| warnings := []string{} |
| sysInfo := sysinfo.New(true) |
| |
| warnings, err := daemon.verifyExperimentalContainerSettings(hostConfig, config) |
| if err != nil { |
| return warnings, err |
| } |
| |
| 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()) |
| } |
| |
| // memory subsystem checks and adjustments |
| if hostConfig.Memory != 0 && hostConfig.Memory < 4194304 { |
| return warnings, fmt.Errorf("Minimum memory limit allowed is 4MB") |
| } |
| if hostConfig.Memory > 0 && !sysInfo.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 |
| hostConfig.MemorySwap = -1 |
| } |
| if hostConfig.Memory > 0 && hostConfig.MemorySwap != -1 && !sysInfo.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 != nil && *hostConfig.MemorySwappiness != -1 && !sysInfo.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 = nil |
| } |
| if hostConfig.MemorySwappiness != nil { |
| swappiness := *hostConfig.MemorySwappiness |
| if swappiness < -1 || swappiness > 100 { |
| return warnings, fmt.Errorf("Invalid value: %v, valid memory swappiness range is 0-100.", swappiness) |
| } |
| } |
| if hostConfig.MemoryReservation > 0 && !sysInfo.MemoryReservation { |
| warnings = append(warnings, "Your kernel does not support memory soft limit capabilities. Limitation discarded.") |
| logrus.Warnf("Your kernel does not support memory soft limit capabilities. Limitation discarded.") |
| hostConfig.MemoryReservation = 0 |
| } |
| if hostConfig.Memory > 0 && hostConfig.MemoryReservation > 0 && hostConfig.Memory < hostConfig.MemoryReservation { |
| return warnings, fmt.Errorf("Minimum memory limit should be larger than memory reservation limit, see usage.") |
| } |
| if hostConfig.KernelMemory > 0 && !sysInfo.KernelMemory { |
| warnings = append(warnings, "Your kernel does not support kernel memory limit capabilities. Limitation discarded.") |
| logrus.Warnf("Your kernel does not support kernel memory limit capabilities. Limitation discarded.") |
| hostConfig.KernelMemory = 0 |
| } |
| if hostConfig.KernelMemory > 0 && !checkKernelVersion(4, 0, 0) { |
| warnings = append(warnings, "You specified a kernel memory limit on a kernel older than 4.0. Kernel memory limits are experimental on older kernels, it won't work as expected and can cause your system to be unstable.") |
| logrus.Warnf("You specified a kernel memory limit on a kernel older than 4.0. Kernel memory limits are experimental on older kernels, it won't work as expected and can cause your system to be unstable.") |
| } |
| if hostConfig.CPUShares > 0 && !sysInfo.CPUShares { |
| warnings = append(warnings, "Your kernel does not support CPU shares. Shares discarded.") |
| logrus.Warnf("Your kernel does not support CPU shares. Shares discarded.") |
| hostConfig.CPUShares = 0 |
| } |
| if hostConfig.CPUPeriod > 0 && !sysInfo.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 && !sysInfo.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.CpusetCpus != "" || hostConfig.CpusetMems != "") && !sysInfo.Cpuset { |
| warnings = append(warnings, "Your kernel does not support cpuset. Cpuset discarded.") |
| logrus.Warnf("Your kernel does not support cpuset. Cpuset discarded.") |
| hostConfig.CpusetCpus = "" |
| hostConfig.CpusetMems = "" |
| } |
| cpusAvailable, err := sysInfo.IsCpusetCpusAvailable(hostConfig.CpusetCpus) |
| if err != nil { |
| return warnings, derr.ErrorCodeInvalidCpusetCpus.WithArgs(hostConfig.CpusetCpus) |
| } |
| if !cpusAvailable { |
| return warnings, derr.ErrorCodeNotAvailableCpusetCpus.WithArgs(hostConfig.CpusetCpus, sysInfo.Cpus) |
| } |
| memsAvailable, err := sysInfo.IsCpusetMemsAvailable(hostConfig.CpusetMems) |
| if err != nil { |
| return warnings, derr.ErrorCodeInvalidCpusetMems.WithArgs(hostConfig.CpusetMems) |
| } |
| if !memsAvailable { |
| return warnings, derr.ErrorCodeNotAvailableCpusetMems.WithArgs(hostConfig.CpusetMems, sysInfo.Mems) |
| } |
| if hostConfig.BlkioWeight > 0 && !sysInfo.BlkioWeight { |
| warnings = append(warnings, "Your kernel does not support Block I/O weight. Weight discarded.") |
| logrus.Warnf("Your kernel does not support Block I/O weight. Weight discarded.") |
| hostConfig.BlkioWeight = 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 && !sysInfo.OomKillDisable { |
| hostConfig.OomKillDisable = false |
| return warnings, fmt.Errorf("Your kernel does not support oom kill disable.") |
| } |
| |
| if sysInfo.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") |
| } |
| return checkKernel() |
| } |
| |
| // configureKernelSecuritySupport configures and validate security support for the kernel |
| func configureKernelSecuritySupport(config *Config, driverName string) error { |
| if config.EnableSelinuxSupport { |
| if selinuxEnabled() { |
| // As Docker on either btrfs or overlayFS and SELinux are incompatible at present, error on both being enabled |
| if driverName == "btrfs" || driverName == "overlay" { |
| return fmt.Errorf("SELinux is not supported with the %s graph driver", driverName) |
| } |
| 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 configureSysInit(config *Config, rootUID, rootGID int) (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/project/set-up-dev-env/ 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 := idtools.MkdirAs(filepath.Dir(localCopy), 0700, rootUID, rootGID); 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 (daemon *Daemon) networkOptions(dconfig *Config) ([]nwconfig.Option, error) { |
| options := []nwconfig.Option{} |
| if dconfig == nil { |
| return options, nil |
| } |
| |
| options = append(options, nwconfig.OptionDataDir(dconfig.Root)) |
| |
| 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.ClusterStore) != "" { |
| kv := strings.Split(dconfig.ClusterStore, "://") |
| 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:], "://"))) |
| } |
| if len(dconfig.ClusterOpts) > 0 { |
| options = append(options, nwconfig.OptionKVOpts(dconfig.ClusterOpts)) |
| } |
| |
| if daemon.discoveryWatcher != nil { |
| options = append(options, nwconfig.OptionDiscoveryWatcher(daemon.discoveryWatcher)) |
| } |
| |
| if dconfig.ClusterAdvertise != "" { |
| options = append(options, nwconfig.OptionDiscoveryAddress(dconfig.ClusterAdvertise)) |
| } |
| |
| options = append(options, nwconfig.OptionLabels(dconfig.Labels)) |
| options = append(options, driverOptions(dconfig)...) |
| return options, nil |
| } |
| |
| func (daemon *Daemon) initNetworkController(config *Config) (libnetwork.NetworkController, error) { |
| netOptions, err := daemon.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 network on "null" |
| if _, err := controller.NewNetwork("null", "none", libnetwork.NetworkOptionPersist(false)); err != nil { |
| return nil, fmt.Errorf("Error creating default \"null\" network: %v", err) |
| } |
| |
| // Initialize default network on "host" |
| if _, err := controller.NewNetwork("host", "host", libnetwork.NetworkOptionPersist(false)); 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 driverOptions(config *Config) []nwconfig.Option { |
| bridgeConfig := options.Generic{ |
| "EnableIPForwarding": config.Bridge.EnableIPForward, |
| "EnableIPTables": config.Bridge.EnableIPTables, |
| "EnableUserlandProxy": config.Bridge.EnableUserlandProxy} |
| bridgeOption := options.Generic{netlabel.GenericData: bridgeConfig} |
| |
| dOptions := []nwconfig.Option{} |
| dOptions = append(dOptions, nwconfig.OptionDriverConfig("bridge", bridgeOption)) |
| return dOptions |
| } |
| |
| func initBridgeDriver(controller libnetwork.NetworkController, config *Config) error { |
| if n, err := controller.NetworkByName("bridge"); err == nil { |
| if err = n.Delete(); err != nil { |
| return fmt.Errorf("could not delete the default bridge network: %v", err) |
| } |
| } |
| |
| bridgeName := bridge.DefaultBridgeName |
| if config.Bridge.Iface != "" { |
| bridgeName = config.Bridge.Iface |
| } |
| netOption := map[string]string{ |
| bridge.BridgeName: bridgeName, |
| bridge.DefaultBridge: strconv.FormatBool(true), |
| netlabel.DriverMTU: strconv.Itoa(config.Mtu), |
| bridge.EnableIPMasquerade: strconv.FormatBool(config.Bridge.EnableIPMasq), |
| bridge.EnableICC: strconv.FormatBool(config.Bridge.InterContainerCommunication), |
| } |
| |
| // --ip processing |
| if config.Bridge.DefaultIP != nil { |
| netOption[bridge.DefaultBindingIP] = config.Bridge.DefaultIP.String() |
| } |
| |
| ipamV4Conf := libnetwork.IpamConf{} |
| |
| ipamV4Conf.AuxAddresses = make(map[string]string) |
| |
| if nw, _, err := ipamutils.ElectInterfaceAddresses(bridgeName); err == nil { |
| ipamV4Conf.PreferredPool = nw.String() |
| hip, _ := types.GetHostPartIP(nw.IP, nw.Mask) |
| if hip.IsGlobalUnicast() { |
| ipamV4Conf.Gateway = nw.IP.String() |
| } |
| } |
| |
| if config.Bridge.IP != "" { |
| ipamV4Conf.PreferredPool = config.Bridge.IP |
| ip, _, err := net.ParseCIDR(config.Bridge.IP) |
| if err != nil { |
| return err |
| } |
| ipamV4Conf.Gateway = ip.String() |
| } |
| |
| if config.Bridge.FixedCIDR != "" { |
| _, fCIDR, err := net.ParseCIDR(config.Bridge.FixedCIDR) |
| if err != nil { |
| return err |
| } |
| |
| ipamV4Conf.SubPool = fCIDR.String() |
| } |
| |
| if config.Bridge.DefaultGatewayIPv4 != nil { |
| ipamV4Conf.AuxAddresses["DefaultGatewayIPv4"] = config.Bridge.DefaultGatewayIPv4.String() |
| } |
| |
| var ipamV6Conf *libnetwork.IpamConf |
| if config.Bridge.FixedCIDRv6 != "" { |
| _, fCIDRv6, err := net.ParseCIDR(config.Bridge.FixedCIDRv6) |
| if err != nil { |
| return err |
| } |
| if ipamV6Conf == nil { |
| ipamV6Conf = &libnetwork.IpamConf{} |
| } |
| ipamV6Conf.PreferredPool = fCIDRv6.String() |
| } |
| |
| if config.Bridge.DefaultGatewayIPv6 != nil { |
| if ipamV6Conf == nil { |
| ipamV6Conf = &libnetwork.IpamConf{} |
| } |
| ipamV6Conf.AuxAddresses["DefaultGatewayIPv6"] = config.Bridge.DefaultGatewayIPv6.String() |
| } |
| |
| v4Conf := []*libnetwork.IpamConf{&ipamV4Conf} |
| v6Conf := []*libnetwork.IpamConf{} |
| if ipamV6Conf != nil { |
| v6Conf = append(v6Conf, ipamV6Conf) |
| } |
| // 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, |
| }), |
| libnetwork.NetworkOptionIpam("default", "", v4Conf, v6Conf)) |
| 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, rootUID, rootGID int) 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 := idtools.MkdirAllAs(filepath.Join(initLayer, filepath.Dir(pth)), 0755, rootUID, rootGID); err != nil { |
| return err |
| } |
| switch typ { |
| case "dir": |
| if err := idtools.MkdirAllAs(filepath.Join(initLayer, pth), 0755, rootUID, rootGID); 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() |
| f.Chown(rootUID, rootGID) |
| 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 |
| } |
| |
| // registerLinks writes the links to a file. |
| 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 |
| } |
| |
| func (daemon *Daemon) newBaseContainer(id string) Container { |
| return Container{ |
| CommonContainer: CommonContainer{ |
| ID: id, |
| State: NewState(), |
| execCommands: newExecStore(), |
| root: daemon.containerRoot(id), |
| }, |
| MountPoints: make(map[string]*mountPoint), |
| Volumes: make(map[string]string), |
| VolumesRW: make(map[string]bool), |
| } |
| } |
| |
| // getDefaultRouteMtu returns the MTU for the default route's interface. |
| func getDefaultRouteMtu() (int, error) { |
| routes, err := netlink.RouteList(nil, 0) |
| if err != nil { |
| return 0, err |
| } |
| for _, r := range routes { |
| // a nil Dst means that this is the default route. |
| if r.Dst == nil { |
| i, err := net.InterfaceByIndex(r.LinkIndex) |
| if err != nil { |
| continue |
| } |
| return i.MTU, nil |
| } |
| } |
| return 0, errNoDefaultRoute |
| } |