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moby--moby/daemon/container_unix.go
2015-11-05 15:22:37 -08:00

1429 lines
40 KiB
Go

// +build linux freebsd
package daemon
import (
"fmt"
"io/ioutil"
"net"
"os"
"path"
"path/filepath"
"strconv"
"strings"
"syscall"
"time"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/daemon/execdriver"
"github.com/docker/docker/daemon/links"
"github.com/docker/docker/daemon/network"
derr "github.com/docker/docker/errors"
"github.com/docker/docker/pkg/directory"
"github.com/docker/docker/pkg/idtools"
"github.com/docker/docker/pkg/nat"
"github.com/docker/docker/pkg/stringid"
"github.com/docker/docker/pkg/symlink"
"github.com/docker/docker/pkg/system"
"github.com/docker/docker/pkg/ulimit"
"github.com/docker/docker/runconfig"
"github.com/docker/docker/utils"
"github.com/docker/docker/volume"
"github.com/docker/libnetwork"
"github.com/docker/libnetwork/netlabel"
"github.com/docker/libnetwork/options"
"github.com/docker/libnetwork/types"
"github.com/opencontainers/runc/libcontainer/configs"
"github.com/opencontainers/runc/libcontainer/devices"
"github.com/opencontainers/runc/libcontainer/label"
)
// DefaultPathEnv is unix style list of directories to search for
// executables. Each directory is separated from the next by a colon
// ':' character .
const DefaultPathEnv = "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
// Container holds the fields specific to unixen implementations. See
// CommonContainer for standard fields common to all containers.
type Container struct {
CommonContainer
// Fields below here are platform specific.
activeLinks map[string]*links.Link
AppArmorProfile string
HostnamePath string
HostsPath string
ShmPath string // TODO Windows - Factor this out (GH15862)
MqueuePath string // TODO Windows - Factor this out (GH15862)
ResolvConfPath string
Volumes map[string]string // Deprecated since 1.7, kept for backwards compatibility
VolumesRW map[string]bool // Deprecated since 1.7, kept for backwards compatibility
}
func killProcessDirectly(container *Container) error {
if _, err := container.WaitStop(10 * time.Second); err != nil {
// Ensure that we don't kill ourselves
if pid := container.GetPID(); pid != 0 {
logrus.Infof("Container %s failed to exit within 10 seconds of kill - trying direct SIGKILL", stringid.TruncateID(container.ID))
if err := syscall.Kill(pid, 9); err != nil {
if err != syscall.ESRCH {
return err
}
logrus.Debugf("Cannot kill process (pid=%d) with signal 9: no such process.", pid)
}
}
}
return nil
}
func (daemon *Daemon) setupLinkedContainers(container *Container) ([]string, error) {
var env []string
children, err := daemon.children(container.Name)
if err != nil {
return nil, err
}
bridgeSettings := container.NetworkSettings.Networks["bridge"]
if bridgeSettings == nil {
return nil, nil
}
if len(children) > 0 {
for linkAlias, child := range children {
if !child.IsRunning() {
return nil, derr.ErrorCodeLinkNotRunning.WithArgs(child.Name, linkAlias)
}
childBridgeSettings := child.NetworkSettings.Networks["bridge"]
if childBridgeSettings == nil {
return nil, fmt.Errorf("container %s not attached to default bridge network", child.ID)
}
link := links.NewLink(
bridgeSettings.IPAddress,
childBridgeSettings.IPAddress,
linkAlias,
child.Config.Env,
child.Config.ExposedPorts,
)
for _, envVar := range link.ToEnv() {
env = append(env, envVar)
}
}
}
return env, nil
}
func (container *Container) createDaemonEnvironment(linkedEnv []string) []string {
// if a domain name was specified, append it to the hostname (see #7851)
fullHostname := container.Config.Hostname
if container.Config.Domainname != "" {
fullHostname = fmt.Sprintf("%s.%s", fullHostname, container.Config.Domainname)
}
// Setup environment
env := []string{
"PATH=" + DefaultPathEnv,
"HOSTNAME=" + fullHostname,
// Note: we don't set HOME here because it'll get autoset intelligently
// based on the value of USER inside dockerinit, but only if it isn't
// set already (ie, that can be overridden by setting HOME via -e or ENV
// in a Dockerfile).
}
if container.Config.Tty {
env = append(env, "TERM=xterm")
}
env = append(env, linkedEnv...)
// because the env on the container can override certain default values
// we need to replace the 'env' keys where they match and append anything
// else.
env = utils.ReplaceOrAppendEnvValues(env, container.Config.Env)
return env
}
func getDevicesFromPath(deviceMapping runconfig.DeviceMapping) (devs []*configs.Device, err error) {
device, err := devices.DeviceFromPath(deviceMapping.PathOnHost, deviceMapping.CgroupPermissions)
// if there was no error, return the device
if err == nil {
device.Path = deviceMapping.PathInContainer
return append(devs, device), nil
}
// if the device is not a device node
// try to see if it's a directory holding many devices
if err == devices.ErrNotADevice {
// check if it is a directory
if src, e := os.Stat(deviceMapping.PathOnHost); e == nil && src.IsDir() {
// mount the internal devices recursively
filepath.Walk(deviceMapping.PathOnHost, func(dpath string, f os.FileInfo, e error) error {
childDevice, e := devices.DeviceFromPath(dpath, deviceMapping.CgroupPermissions)
if e != nil {
// ignore the device
return nil
}
// add the device to userSpecified devices
childDevice.Path = strings.Replace(dpath, deviceMapping.PathOnHost, deviceMapping.PathInContainer, 1)
devs = append(devs, childDevice)
return nil
})
}
}
if len(devs) > 0 {
return devs, nil
}
return devs, derr.ErrorCodeDeviceInfo.WithArgs(deviceMapping.PathOnHost, err)
}
func (daemon *Daemon) populateCommand(c *Container, env []string) error {
var en *execdriver.Network
if !c.Config.NetworkDisabled {
en = &execdriver.Network{}
if !daemon.execDriver.SupportsHooks() || c.hostConfig.NetworkMode.IsHost() {
en.NamespacePath = c.NetworkSettings.SandboxKey
}
if c.hostConfig.NetworkMode.IsContainer() {
nc, err := daemon.getNetworkedContainer(c.ID, c.hostConfig.NetworkMode.ConnectedContainer())
if err != nil {
return err
}
en.ContainerID = nc.ID
}
}
ipc := &execdriver.Ipc{}
var err error
c.ShmPath, err = c.shmPath()
if err != nil {
return err
}
c.MqueuePath, err = c.mqueuePath()
if err != nil {
return err
}
if c.hostConfig.IpcMode.IsContainer() {
ic, err := daemon.getIpcContainer(c)
if err != nil {
return err
}
ipc.ContainerID = ic.ID
c.ShmPath = ic.ShmPath
c.MqueuePath = ic.MqueuePath
} else {
ipc.HostIpc = c.hostConfig.IpcMode.IsHost()
if ipc.HostIpc {
if _, err := os.Stat("/dev/shm"); err != nil {
return fmt.Errorf("/dev/shm is not mounted, but must be for --host=ipc")
}
if _, err := os.Stat("/dev/mqueue"); err != nil {
return fmt.Errorf("/dev/mqueue is not mounted, but must be for --host=ipc")
}
c.ShmPath = "/dev/shm"
c.MqueuePath = "/dev/mqueue"
}
}
pid := &execdriver.Pid{}
pid.HostPid = c.hostConfig.PidMode.IsHost()
uts := &execdriver.UTS{
HostUTS: c.hostConfig.UTSMode.IsHost(),
}
// Build lists of devices allowed and created within the container.
var userSpecifiedDevices []*configs.Device
for _, deviceMapping := range c.hostConfig.Devices {
devs, err := getDevicesFromPath(deviceMapping)
if err != nil {
return err
}
userSpecifiedDevices = append(userSpecifiedDevices, devs...)
}
allowedDevices := mergeDevices(configs.DefaultAllowedDevices, userSpecifiedDevices)
autoCreatedDevices := mergeDevices(configs.DefaultAutoCreatedDevices, userSpecifiedDevices)
var rlimits []*ulimit.Rlimit
ulimits := c.hostConfig.Ulimits
// Merge ulimits with daemon defaults
ulIdx := make(map[string]*ulimit.Ulimit)
for _, ul := range ulimits {
ulIdx[ul.Name] = ul
}
for name, ul := range daemon.configStore.Ulimits {
if _, exists := ulIdx[name]; !exists {
ulimits = append(ulimits, ul)
}
}
for _, limit := range ulimits {
rl, err := limit.GetRlimit()
if err != nil {
return err
}
rlimits = append(rlimits, rl)
}
resources := &execdriver.Resources{
CommonResources: execdriver.CommonResources{
Memory: c.hostConfig.Memory,
MemoryReservation: c.hostConfig.MemoryReservation,
CPUShares: c.hostConfig.CPUShares,
BlkioWeight: c.hostConfig.BlkioWeight,
},
MemorySwap: c.hostConfig.MemorySwap,
KernelMemory: c.hostConfig.KernelMemory,
CpusetCpus: c.hostConfig.CpusetCpus,
CpusetMems: c.hostConfig.CpusetMems,
CPUPeriod: c.hostConfig.CPUPeriod,
CPUQuota: c.hostConfig.CPUQuota,
Rlimits: rlimits,
OomKillDisable: c.hostConfig.OomKillDisable,
MemorySwappiness: -1,
}
if c.hostConfig.MemorySwappiness != nil {
resources.MemorySwappiness = *c.hostConfig.MemorySwappiness
}
processConfig := execdriver.ProcessConfig{
Privileged: c.hostConfig.Privileged,
Entrypoint: c.Path,
Arguments: c.Args,
Tty: c.Config.Tty,
User: c.Config.User,
}
processConfig.SysProcAttr = &syscall.SysProcAttr{Setsid: true}
processConfig.Env = env
remappedRoot := &execdriver.User{}
rootUID, rootGID := daemon.GetRemappedUIDGID()
if rootUID != 0 {
remappedRoot.UID = rootUID
remappedRoot.GID = rootGID
}
uidMap, gidMap := daemon.GetUIDGIDMaps()
c.command = &execdriver.Command{
CommonCommand: execdriver.CommonCommand{
ID: c.ID,
InitPath: "/.dockerinit",
MountLabel: c.getMountLabel(),
Network: en,
ProcessConfig: processConfig,
ProcessLabel: c.getProcessLabel(),
Rootfs: c.rootfsPath(),
Resources: resources,
WorkingDir: c.Config.WorkingDir,
},
AllowedDevices: allowedDevices,
AppArmorProfile: c.AppArmorProfile,
AutoCreatedDevices: autoCreatedDevices,
CapAdd: c.hostConfig.CapAdd.Slice(),
CapDrop: c.hostConfig.CapDrop.Slice(),
CgroupParent: c.hostConfig.CgroupParent,
GIDMapping: gidMap,
GroupAdd: c.hostConfig.GroupAdd,
Ipc: ipc,
Pid: pid,
ReadonlyRootfs: c.hostConfig.ReadonlyRootfs,
RemappedRoot: remappedRoot,
UIDMapping: uidMap,
UTS: uts,
}
return nil
}
func mergeDevices(defaultDevices, userDevices []*configs.Device) []*configs.Device {
if len(userDevices) == 0 {
return defaultDevices
}
paths := map[string]*configs.Device{}
for _, d := range userDevices {
paths[d.Path] = d
}
var devs []*configs.Device
for _, d := range defaultDevices {
if _, defined := paths[d.Path]; !defined {
devs = append(devs, d)
}
}
return append(devs, userDevices...)
}
// getSize returns the real size & virtual size of the container.
func (daemon *Daemon) getSize(container *Container) (int64, int64) {
var (
sizeRw, sizeRootfs int64
err error
)
if err := daemon.Mount(container); err != nil {
logrus.Errorf("Failed to compute size of container rootfs %s: %s", container.ID, err)
return sizeRw, sizeRootfs
}
defer daemon.Unmount(container)
initID := fmt.Sprintf("%s-init", container.ID)
sizeRw, err = daemon.driver.DiffSize(container.ID, initID)
if err != nil {
logrus.Errorf("Driver %s couldn't return diff size of container %s: %s", daemon.driver, container.ID, err)
// FIXME: GetSize should return an error. Not changing it now in case
// there is a side-effect.
sizeRw = -1
}
if _, err = os.Stat(container.basefs); err == nil {
if sizeRootfs, err = directory.Size(container.basefs); err != nil {
sizeRootfs = -1
}
}
return sizeRw, sizeRootfs
}
// Attempt to set the network mounts given a provided destination and
// the path to use for it; return true if the given destination was a
// network mount file
func (container *Container) trySetNetworkMount(destination string, path string) bool {
if destination == "/etc/resolv.conf" {
container.ResolvConfPath = path
return true
}
if destination == "/etc/hostname" {
container.HostnamePath = path
return true
}
if destination == "/etc/hosts" {
container.HostsPath = path
return true
}
return false
}
func (container *Container) buildHostnameFile() error {
hostnamePath, err := container.getRootResourcePath("hostname")
if err != nil {
return err
}
container.HostnamePath = hostnamePath
if container.Config.Domainname != "" {
return ioutil.WriteFile(container.HostnamePath, []byte(fmt.Sprintf("%s.%s\n", container.Config.Hostname, container.Config.Domainname)), 0644)
}
return ioutil.WriteFile(container.HostnamePath, []byte(container.Config.Hostname+"\n"), 0644)
}
func (daemon *Daemon) buildSandboxOptions(container *Container, n libnetwork.Network) ([]libnetwork.SandboxOption, error) {
var (
sboxOptions []libnetwork.SandboxOption
err error
dns []string
dnsSearch []string
dnsOptions []string
)
sboxOptions = append(sboxOptions, libnetwork.OptionHostname(container.Config.Hostname),
libnetwork.OptionDomainname(container.Config.Domainname))
if container.hostConfig.NetworkMode.IsHost() {
sboxOptions = append(sboxOptions, libnetwork.OptionUseDefaultSandbox())
sboxOptions = append(sboxOptions, libnetwork.OptionOriginHostsPath("/etc/hosts"))
sboxOptions = append(sboxOptions, libnetwork.OptionOriginResolvConfPath("/etc/resolv.conf"))
} else if daemon.execDriver.SupportsHooks() {
// OptionUseExternalKey is mandatory for userns support.
// But optional for non-userns support
sboxOptions = append(sboxOptions, libnetwork.OptionUseExternalKey())
}
container.HostsPath, err = container.getRootResourcePath("hosts")
if err != nil {
return nil, err
}
sboxOptions = append(sboxOptions, libnetwork.OptionHostsPath(container.HostsPath))
container.ResolvConfPath, err = container.getRootResourcePath("resolv.conf")
if err != nil {
return nil, err
}
sboxOptions = append(sboxOptions, libnetwork.OptionResolvConfPath(container.ResolvConfPath))
if len(container.hostConfig.DNS) > 0 {
dns = container.hostConfig.DNS
} else if len(daemon.configStore.DNS) > 0 {
dns = daemon.configStore.DNS
}
for _, d := range dns {
sboxOptions = append(sboxOptions, libnetwork.OptionDNS(d))
}
if len(container.hostConfig.DNSSearch) > 0 {
dnsSearch = container.hostConfig.DNSSearch
} else if len(daemon.configStore.DNSSearch) > 0 {
dnsSearch = daemon.configStore.DNSSearch
}
for _, ds := range dnsSearch {
sboxOptions = append(sboxOptions, libnetwork.OptionDNSSearch(ds))
}
if len(container.hostConfig.DNSOptions) > 0 {
dnsOptions = container.hostConfig.DNSOptions
} else if len(daemon.configStore.DNSOptions) > 0 {
dnsOptions = daemon.configStore.DNSOptions
}
for _, ds := range dnsOptions {
sboxOptions = append(sboxOptions, libnetwork.OptionDNSOptions(ds))
}
if container.NetworkSettings.SecondaryIPAddresses != nil {
name := container.Config.Hostname
if container.Config.Domainname != "" {
name = name + "." + container.Config.Domainname
}
for _, a := range container.NetworkSettings.SecondaryIPAddresses {
sboxOptions = append(sboxOptions, libnetwork.OptionExtraHost(name, a.Addr))
}
}
for _, extraHost := range container.hostConfig.ExtraHosts {
// allow IPv6 addresses in extra hosts; only split on first ":"
parts := strings.SplitN(extraHost, ":", 2)
sboxOptions = append(sboxOptions, libnetwork.OptionExtraHost(parts[0], parts[1]))
}
// Link feature is supported only for the default bridge network.
// return if this call to build join options is not for default bridge network
if n.Name() != "bridge" {
return sboxOptions, nil
}
ep, _ := container.getEndpointInNetwork(n)
if ep == nil {
return sboxOptions, nil
}
var childEndpoints, parentEndpoints []string
children, err := daemon.children(container.Name)
if err != nil {
return nil, err
}
for linkAlias, child := range children {
if !isLinkable(child) {
return nil, fmt.Errorf("Cannot link to %s, as it does not belong to the default network", child.Name)
}
_, alias := path.Split(linkAlias)
// allow access to the linked container via the alias, real name, and container hostname
aliasList := alias + " " + child.Config.Hostname
// only add the name if alias isn't equal to the name
if alias != child.Name[1:] {
aliasList = aliasList + " " + child.Name[1:]
}
sboxOptions = append(sboxOptions, libnetwork.OptionExtraHost(aliasList, child.NetworkSettings.Networks["bridge"].IPAddress))
cEndpoint, _ := child.getEndpointInNetwork(n)
if cEndpoint != nil && cEndpoint.ID() != "" {
childEndpoints = append(childEndpoints, cEndpoint.ID())
}
}
bridgeSettings := container.NetworkSettings.Networks["bridge"]
refs := daemon.containerGraph().RefPaths(container.ID)
for _, ref := range refs {
if ref.ParentID == "0" {
continue
}
c, err := daemon.Get(ref.ParentID)
if err != nil {
logrus.Error(err)
}
if c != nil && !daemon.configStore.DisableBridge && container.hostConfig.NetworkMode.IsPrivate() {
logrus.Debugf("Update /etc/hosts of %s for alias %s with ip %s", c.ID, ref.Name, bridgeSettings.IPAddress)
sboxOptions = append(sboxOptions, libnetwork.OptionParentUpdate(c.ID, ref.Name, bridgeSettings.IPAddress))
if ep.ID() != "" {
parentEndpoints = append(parentEndpoints, ep.ID())
}
}
}
linkOptions := options.Generic{
netlabel.GenericData: options.Generic{
"ParentEndpoints": parentEndpoints,
"ChildEndpoints": childEndpoints,
},
}
sboxOptions = append(sboxOptions, libnetwork.OptionGeneric(linkOptions))
return sboxOptions, nil
}
func isLinkable(child *Container) bool {
// A container is linkable only if it belongs to the default network
_, ok := child.NetworkSettings.Networks["bridge"]
return ok
}
func (container *Container) getEndpointInNetwork(n libnetwork.Network) (libnetwork.Endpoint, error) {
endpointName := strings.TrimPrefix(container.Name, "/")
return n.EndpointByName(endpointName)
}
func (container *Container) buildPortMapInfo(ep libnetwork.Endpoint, networkSettings *network.Settings) (*network.Settings, error) {
if ep == nil {
return nil, derr.ErrorCodeEmptyEndpoint
}
if networkSettings == nil {
return nil, derr.ErrorCodeEmptyNetwork
}
driverInfo, err := ep.DriverInfo()
if err != nil {
return nil, err
}
if driverInfo == nil {
// It is not an error for epInfo to be nil
return networkSettings, nil
}
networkSettings.Ports = nat.PortMap{}
if expData, ok := driverInfo[netlabel.ExposedPorts]; ok {
if exposedPorts, ok := expData.([]types.TransportPort); ok {
for _, tp := range exposedPorts {
natPort, err := nat.NewPort(tp.Proto.String(), strconv.Itoa(int(tp.Port)))
if err != nil {
return nil, derr.ErrorCodeParsingPort.WithArgs(tp.Port, err)
}
networkSettings.Ports[natPort] = nil
}
}
}
mapData, ok := driverInfo[netlabel.PortMap]
if !ok {
return networkSettings, nil
}
if portMapping, ok := mapData.([]types.PortBinding); ok {
for _, pp := range portMapping {
natPort, err := nat.NewPort(pp.Proto.String(), strconv.Itoa(int(pp.Port)))
if err != nil {
return nil, err
}
natBndg := nat.PortBinding{HostIP: pp.HostIP.String(), HostPort: strconv.Itoa(int(pp.HostPort))}
networkSettings.Ports[natPort] = append(networkSettings.Ports[natPort], natBndg)
}
}
return networkSettings, nil
}
func (container *Container) buildEndpointInfo(n libnetwork.Network, ep libnetwork.Endpoint, networkSettings *network.Settings) (*network.Settings, error) {
if ep == nil {
return nil, derr.ErrorCodeEmptyEndpoint
}
if networkSettings == nil {
return nil, derr.ErrorCodeEmptyNetwork
}
epInfo := ep.Info()
if epInfo == nil {
// It is not an error to get an empty endpoint info
return networkSettings, nil
}
if _, ok := networkSettings.Networks[n.Name()]; !ok {
networkSettings.Networks[n.Name()] = new(network.EndpointSettings)
}
networkSettings.Networks[n.Name()].EndpointID = ep.ID()
iface := epInfo.Iface()
if iface == nil {
return networkSettings, nil
}
if iface.MacAddress() != nil {
networkSettings.Networks[n.Name()].MacAddress = iface.MacAddress().String()
}
if iface.Address() != nil {
ones, _ := iface.Address().Mask.Size()
networkSettings.Networks[n.Name()].IPAddress = iface.Address().IP.String()
networkSettings.Networks[n.Name()].IPPrefixLen = ones
}
if iface.AddressIPv6() != nil && iface.AddressIPv6().IP.To16() != nil {
onesv6, _ := iface.AddressIPv6().Mask.Size()
networkSettings.Networks[n.Name()].GlobalIPv6Address = iface.AddressIPv6().IP.String()
networkSettings.Networks[n.Name()].GlobalIPv6PrefixLen = onesv6
}
return networkSettings, nil
}
func (container *Container) updateJoinInfo(n libnetwork.Network, ep libnetwork.Endpoint) error {
if _, err := container.buildPortMapInfo(ep, container.NetworkSettings); err != nil {
return err
}
epInfo := ep.Info()
if epInfo == nil {
// It is not an error to get an empty endpoint info
return nil
}
if epInfo.Gateway() != nil {
container.NetworkSettings.Networks[n.Name()].Gateway = epInfo.Gateway().String()
}
if epInfo.GatewayIPv6().To16() != nil {
container.NetworkSettings.Networks[n.Name()].IPv6Gateway = epInfo.GatewayIPv6().String()
}
return nil
}
func (daemon *Daemon) updateNetworkSettings(container *Container, n libnetwork.Network) error {
if container.NetworkSettings == nil {
container.NetworkSettings = &network.Settings{Networks: make(map[string]*network.EndpointSettings)}
}
for s := range container.NetworkSettings.Networks {
sn, err := daemon.FindNetwork(s)
if err != nil {
continue
}
if sn.Name() == n.Name() {
// Avoid duplicate config
return nil
}
if !runconfig.NetworkMode(sn.Type()).IsPrivate() ||
!runconfig.NetworkMode(n.Type()).IsPrivate() {
return runconfig.ErrConflictSharedNetwork
}
if runconfig.NetworkMode(sn.Name()).IsNone() ||
runconfig.NetworkMode(n.Name()).IsNone() {
return runconfig.ErrConflictNoNetwork
}
}
container.NetworkSettings.Networks[n.Name()] = new(network.EndpointSettings)
return nil
}
func (daemon *Daemon) updateEndpointNetworkSettings(container *Container, n libnetwork.Network, ep libnetwork.Endpoint) error {
networkSettings, err := container.buildEndpointInfo(n, ep, container.NetworkSettings)
if err != nil {
return err
}
if container.hostConfig.NetworkMode == runconfig.NetworkMode("bridge") {
networkSettings.Bridge = daemon.configStore.Bridge.Iface
}
return nil
}
func (container *Container) updateSandboxNetworkSettings(sb libnetwork.Sandbox) error {
container.NetworkSettings.SandboxID = sb.ID()
container.NetworkSettings.SandboxKey = sb.Key()
return nil
}
// UpdateNetwork is used to update the container's network (e.g. when linked containers
// get removed/unlinked).
func (daemon *Daemon) updateNetwork(container *Container) error {
ctrl := daemon.netController
sid := container.NetworkSettings.SandboxID
sb, err := ctrl.SandboxByID(sid)
if err != nil {
return derr.ErrorCodeNoSandbox.WithArgs(sid, err)
}
// Find if container is connected to the default bridge network
var n libnetwork.Network
for name := range container.NetworkSettings.Networks {
sn, err := daemon.FindNetwork(name)
if err != nil {
continue
}
if sn.Name() == "bridge" {
n = sn
break
}
}
if n == nil {
// Not connected to the default bridge network; Nothing to do
return nil
}
options, err := daemon.buildSandboxOptions(container, n)
if err != nil {
return derr.ErrorCodeNetworkUpdate.WithArgs(err)
}
if err := sb.Refresh(options...); err != nil {
return derr.ErrorCodeNetworkRefresh.WithArgs(sid, err)
}
return nil
}
func (container *Container) buildCreateEndpointOptions(n libnetwork.Network) ([]libnetwork.EndpointOption, error) {
var (
portSpecs = make(nat.PortSet)
bindings = make(nat.PortMap)
pbList []types.PortBinding
exposeList []types.TransportPort
createOptions []libnetwork.EndpointOption
)
if container.Config.ExposedPorts != nil {
portSpecs = container.Config.ExposedPorts
}
if container.hostConfig.PortBindings != nil {
for p, b := range container.hostConfig.PortBindings {
bindings[p] = []nat.PortBinding{}
for _, bb := range b {
bindings[p] = append(bindings[p], nat.PortBinding{
HostIP: bb.HostIP,
HostPort: bb.HostPort,
})
}
}
}
ports := make([]nat.Port, len(portSpecs))
var i int
for p := range portSpecs {
ports[i] = p
i++
}
nat.SortPortMap(ports, bindings)
for _, port := range ports {
expose := types.TransportPort{}
expose.Proto = types.ParseProtocol(port.Proto())
expose.Port = uint16(port.Int())
exposeList = append(exposeList, expose)
pb := types.PortBinding{Port: expose.Port, Proto: expose.Proto}
binding := bindings[port]
for i := 0; i < len(binding); i++ {
pbCopy := pb.GetCopy()
newP, err := nat.NewPort(nat.SplitProtoPort(binding[i].HostPort))
var portStart, portEnd int
if err == nil {
portStart, portEnd, err = newP.Range()
}
if err != nil {
return nil, derr.ErrorCodeHostPort.WithArgs(binding[i].HostPort, err)
}
pbCopy.HostPort = uint16(portStart)
pbCopy.HostPortEnd = uint16(portEnd)
pbCopy.HostIP = net.ParseIP(binding[i].HostIP)
pbList = append(pbList, pbCopy)
}
if container.hostConfig.PublishAllPorts && len(binding) == 0 {
pbList = append(pbList, pb)
}
}
createOptions = append(createOptions,
libnetwork.CreateOptionPortMapping(pbList),
libnetwork.CreateOptionExposedPorts(exposeList))
if container.Config.MacAddress != "" {
mac, err := net.ParseMAC(container.Config.MacAddress)
if err != nil {
return nil, err
}
genericOption := options.Generic{
netlabel.MacAddress: mac,
}
createOptions = append(createOptions, libnetwork.EndpointOptionGeneric(genericOption))
}
if n.Name() == "bridge" || container.NetworkSettings.IsAnonymousEndpoint {
createOptions = append(createOptions, libnetwork.CreateOptionAnonymous())
}
return createOptions, nil
}
func (daemon *Daemon) allocateNetwork(container *Container) error {
controller := daemon.netController
// Cleanup any stale sandbox left over due to ungraceful daemon shutdown
if err := controller.SandboxDestroy(container.ID); err != nil {
logrus.Errorf("failed to cleanup up stale network sandbox for container %s", container.ID)
}
updateSettings := false
if len(container.NetworkSettings.Networks) == 0 {
mode := container.hostConfig.NetworkMode
if container.Config.NetworkDisabled || mode.IsContainer() {
return nil
}
networkName := mode.NetworkName()
if mode.IsDefault() {
networkName = controller.Config().Daemon.DefaultNetwork
}
if mode.IsUserDefined() {
n, err := daemon.FindNetwork(networkName)
if err != nil {
return err
}
networkName = n.Name()
}
container.NetworkSettings.Networks = make(map[string]*network.EndpointSettings)
container.NetworkSettings.Networks[networkName] = new(network.EndpointSettings)
updateSettings = true
}
for n := range container.NetworkSettings.Networks {
if err := daemon.connectToNetwork(container, n, updateSettings); err != nil {
return err
}
}
return container.writeHostConfig()
}
func (daemon *Daemon) getNetworkSandbox(container *Container) libnetwork.Sandbox {
var sb libnetwork.Sandbox
daemon.netController.WalkSandboxes(func(s libnetwork.Sandbox) bool {
if s.ContainerID() == container.ID {
sb = s
return true
}
return false
})
return sb
}
// ConnectToNetwork connects a container to a netork
func (daemon *Daemon) ConnectToNetwork(container *Container, idOrName string) error {
if !container.Running {
return derr.ErrorCodeNotRunning.WithArgs(container.ID)
}
if err := daemon.connectToNetwork(container, idOrName, true); err != nil {
return err
}
if err := container.toDiskLocking(); err != nil {
return fmt.Errorf("Error saving container to disk: %v", err)
}
return nil
}
func (daemon *Daemon) connectToNetwork(container *Container, idOrName string, updateSettings bool) (err error) {
if container.hostConfig.NetworkMode.IsContainer() {
return runconfig.ErrConflictSharedNetwork
}
if runconfig.NetworkMode(idOrName).IsBridge() &&
daemon.configStore.DisableBridge {
container.Config.NetworkDisabled = true
return nil
}
controller := daemon.netController
n, err := daemon.FindNetwork(idOrName)
if err != nil {
return err
}
if updateSettings {
if err := daemon.updateNetworkSettings(container, n); err != nil {
return err
}
}
ep, err := container.getEndpointInNetwork(n)
if err == nil {
return fmt.Errorf("container already connected to network %s", idOrName)
}
if _, ok := err.(libnetwork.ErrNoSuchEndpoint); !ok {
return err
}
createOptions, err := container.buildCreateEndpointOptions(n)
if err != nil {
return err
}
endpointName := strings.TrimPrefix(container.Name, "/")
ep, err = n.CreateEndpoint(endpointName, createOptions...)
if err != nil {
return err
}
defer func() {
if err != nil {
if e := ep.Delete(); e != nil {
logrus.Warnf("Could not rollback container connection to network %s", idOrName)
}
}
}()
if err := daemon.updateEndpointNetworkSettings(container, n, ep); err != nil {
return err
}
sb := daemon.getNetworkSandbox(container)
if sb == nil {
options, err := daemon.buildSandboxOptions(container, n)
if err != nil {
return err
}
sb, err = controller.NewSandbox(container.ID, options...)
if err != nil {
return err
}
container.updateSandboxNetworkSettings(sb)
}
if err := ep.Join(sb); err != nil {
return err
}
if err := container.updateJoinInfo(n, ep); err != nil {
return derr.ErrorCodeJoinInfo.WithArgs(err)
}
return nil
}
func (daemon *Daemon) initializeNetworking(container *Container) error {
var err error
if container.hostConfig.NetworkMode.IsContainer() {
// we need to get the hosts files from the container to join
nc, err := daemon.getNetworkedContainer(container.ID, container.hostConfig.NetworkMode.ConnectedContainer())
if err != nil {
return err
}
container.HostnamePath = nc.HostnamePath
container.HostsPath = nc.HostsPath
container.ResolvConfPath = nc.ResolvConfPath
container.Config.Hostname = nc.Config.Hostname
container.Config.Domainname = nc.Config.Domainname
return nil
}
if container.hostConfig.NetworkMode.IsHost() {
container.Config.Hostname, err = os.Hostname()
if err != nil {
return err
}
parts := strings.SplitN(container.Config.Hostname, ".", 2)
if len(parts) > 1 {
container.Config.Hostname = parts[0]
container.Config.Domainname = parts[1]
}
}
if err := daemon.allocateNetwork(container); err != nil {
return err
}
return container.buildHostnameFile()
}
// called from the libcontainer pre-start hook to set the network
// namespace configuration linkage to the libnetwork "sandbox" entity
func (daemon *Daemon) setNetworkNamespaceKey(containerID string, pid int) error {
path := fmt.Sprintf("/proc/%d/ns/net", pid)
var sandbox libnetwork.Sandbox
search := libnetwork.SandboxContainerWalker(&sandbox, containerID)
daemon.netController.WalkSandboxes(search)
if sandbox == nil {
return derr.ErrorCodeNoSandbox.WithArgs(containerID, "no sandbox found")
}
return sandbox.SetKey(path)
}
func (daemon *Daemon) getIpcContainer(container *Container) (*Container, error) {
containerID := container.hostConfig.IpcMode.Container()
c, err := daemon.Get(containerID)
if err != nil {
return nil, err
}
if !c.IsRunning() {
return nil, derr.ErrorCodeIPCRunning
}
return c, nil
}
func (container *Container) setupWorkingDirectory() error {
if container.Config.WorkingDir == "" {
return nil
}
container.Config.WorkingDir = filepath.Clean(container.Config.WorkingDir)
pth, err := container.GetResourcePath(container.Config.WorkingDir)
if err != nil {
return err
}
pthInfo, err := os.Stat(pth)
if err != nil {
if !os.IsNotExist(err) {
return err
}
if err := system.MkdirAll(pth, 0755); err != nil {
return err
}
}
if pthInfo != nil && !pthInfo.IsDir() {
return derr.ErrorCodeNotADir.WithArgs(container.Config.WorkingDir)
}
return nil
}
func (daemon *Daemon) getNetworkedContainer(containerID, connectedContainerID string) (*Container, error) {
nc, err := daemon.Get(connectedContainerID)
if err != nil {
return nil, err
}
if containerID == nc.ID {
return nil, derr.ErrorCodeJoinSelf
}
if !nc.IsRunning() {
return nil, derr.ErrorCodeJoinRunning.WithArgs(connectedContainerID)
}
return nc, nil
}
func (daemon *Daemon) releaseNetwork(container *Container) {
if container.hostConfig.NetworkMode.IsContainer() || container.Config.NetworkDisabled {
return
}
sid := container.NetworkSettings.SandboxID
networks := container.NetworkSettings.Networks
for n := range networks {
networks[n] = &network.EndpointSettings{}
}
container.NetworkSettings = &network.Settings{Networks: networks}
if sid == "" || len(networks) == 0 {
return
}
sb, err := daemon.netController.SandboxByID(sid)
if err != nil {
logrus.Errorf("error locating sandbox id %s: %v", sid, err)
return
}
if err := sb.Delete(); err != nil {
logrus.Errorf("Error deleting sandbox id %s for container %s: %v", sid, container.ID, err)
}
}
// DisconnectFromNetwork disconnects a container from a network
func (container *Container) DisconnectFromNetwork(n libnetwork.Network) error {
if !container.Running {
return derr.ErrorCodeNotRunning.WithArgs(container.ID)
}
if err := container.disconnectFromNetwork(n); err != nil {
return err
}
if err := container.toDiskLocking(); err != nil {
return fmt.Errorf("Error saving container to disk: %v", err)
}
return nil
}
func (container *Container) disconnectFromNetwork(n libnetwork.Network) error {
var (
ep libnetwork.Endpoint
sbox libnetwork.Sandbox
)
s := func(current libnetwork.Endpoint) bool {
epInfo := current.Info()
if epInfo == nil {
return false
}
if sb := epInfo.Sandbox(); sb != nil {
if sb.ContainerID() == container.ID {
ep = current
sbox = sb
return true
}
}
return false
}
n.WalkEndpoints(s)
if ep == nil {
return fmt.Errorf("container %s is not connected to the network", container.ID)
}
if err := ep.Leave(sbox); err != nil {
return fmt.Errorf("container %s failed to leave network %s: %v", container.ID, n.Name(), err)
}
if err := ep.Delete(); err != nil {
return fmt.Errorf("endpoint delete failed for container %s on network %s: %v", container.ID, n.Name(), err)
}
delete(container.NetworkSettings.Networks, n.Name())
return nil
}
// appendNetworkMounts appends any network mounts to the array of mount points passed in
func appendNetworkMounts(container *Container, volumeMounts []volume.MountPoint) ([]volume.MountPoint, error) {
for _, mnt := range container.networkMounts() {
dest, err := container.GetResourcePath(mnt.Destination)
if err != nil {
return nil, err
}
volumeMounts = append(volumeMounts, volume.MountPoint{Destination: dest})
}
return volumeMounts, nil
}
func (container *Container) networkMounts() []execdriver.Mount {
var mounts []execdriver.Mount
shared := container.hostConfig.NetworkMode.IsContainer()
if container.ResolvConfPath != "" {
if _, err := os.Stat(container.ResolvConfPath); err != nil {
logrus.Warnf("ResolvConfPath set to %q, but can't stat this filename (err = %v); skipping", container.ResolvConfPath, err)
} else {
label.Relabel(container.ResolvConfPath, container.MountLabel, shared)
writable := !container.hostConfig.ReadonlyRootfs
if m, exists := container.MountPoints["/etc/resolv.conf"]; exists {
writable = m.RW
}
mounts = append(mounts, execdriver.Mount{
Source: container.ResolvConfPath,
Destination: "/etc/resolv.conf",
Writable: writable,
Private: true,
})
}
}
if container.HostnamePath != "" {
if _, err := os.Stat(container.HostnamePath); err != nil {
logrus.Warnf("HostnamePath set to %q, but can't stat this filename (err = %v); skipping", container.HostnamePath, err)
} else {
label.Relabel(container.HostnamePath, container.MountLabel, shared)
writable := !container.hostConfig.ReadonlyRootfs
if m, exists := container.MountPoints["/etc/hostname"]; exists {
writable = m.RW
}
mounts = append(mounts, execdriver.Mount{
Source: container.HostnamePath,
Destination: "/etc/hostname",
Writable: writable,
Private: true,
})
}
}
if container.HostsPath != "" {
if _, err := os.Stat(container.HostsPath); err != nil {
logrus.Warnf("HostsPath set to %q, but can't stat this filename (err = %v); skipping", container.HostsPath, err)
} else {
label.Relabel(container.HostsPath, container.MountLabel, shared)
writable := !container.hostConfig.ReadonlyRootfs
if m, exists := container.MountPoints["/etc/hosts"]; exists {
writable = m.RW
}
mounts = append(mounts, execdriver.Mount{
Source: container.HostsPath,
Destination: "/etc/hosts",
Writable: writable,
Private: true,
})
}
}
return mounts
}
func (container *Container) copyImagePathContent(v volume.Volume, destination string) error {
rootfs, err := symlink.FollowSymlinkInScope(filepath.Join(container.basefs, destination), container.basefs)
if err != nil {
return err
}
if _, err = ioutil.ReadDir(rootfs); err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
path, err := v.Mount()
if err != nil {
return err
}
if err := copyExistingContents(rootfs, path); err != nil {
return err
}
return v.Unmount()
}
func (container *Container) shmPath() (string, error) {
return container.getRootResourcePath("shm")
}
func (container *Container) mqueuePath() (string, error) {
return container.getRootResourcePath("mqueue")
}
func (container *Container) hasMountFor(path string) bool {
_, exists := container.MountPoints[path]
return exists
}
func (daemon *Daemon) setupIpcDirs(container *Container) error {
rootUID, rootGID := daemon.GetRemappedUIDGID()
if !container.hasMountFor("/dev/shm") {
shmPath, err := container.shmPath()
if err != nil {
return err
}
if err := idtools.MkdirAllAs(shmPath, 0700, rootUID, rootGID); err != nil {
return err
}
if err := syscall.Mount("shm", shmPath, "tmpfs", uintptr(syscall.MS_NOEXEC|syscall.MS_NOSUID|syscall.MS_NODEV), label.FormatMountLabel("mode=1777,size=65536k", container.getMountLabel())); err != nil {
return fmt.Errorf("mounting shm tmpfs: %s", err)
}
if err := os.Chown(shmPath, rootUID, rootGID); err != nil {
return err
}
}
if !container.hasMountFor("/dev/mqueue") {
mqueuePath, err := container.mqueuePath()
if err != nil {
return err
}
if err := idtools.MkdirAllAs(mqueuePath, 0700, rootUID, rootGID); err != nil {
return err
}
if err := syscall.Mount("mqueue", mqueuePath, "mqueue", uintptr(syscall.MS_NOEXEC|syscall.MS_NOSUID|syscall.MS_NODEV), ""); err != nil {
return fmt.Errorf("mounting mqueue mqueue : %s", err)
}
if err := os.Chown(mqueuePath, rootUID, rootGID); err != nil {
return err
}
}
return nil
}
func (container *Container) unmountIpcMounts(unmount func(pth string) error) {
if container.hostConfig.IpcMode.IsContainer() || container.hostConfig.IpcMode.IsHost() {
return
}
var warnings []string
if !container.hasMountFor("/dev/shm") {
shmPath, err := container.shmPath()
if err != nil {
logrus.Error(err)
warnings = append(warnings, err.Error())
} else if shmPath != "" {
if err := unmount(shmPath); err != nil {
warnings = append(warnings, fmt.Sprintf("failed to umount %s: %v", shmPath, err))
}
}
}
if !container.hasMountFor("/dev/mqueue") {
mqueuePath, err := container.mqueuePath()
if err != nil {
logrus.Error(err)
warnings = append(warnings, err.Error())
} else if mqueuePath != "" {
if err := unmount(mqueuePath); err != nil {
warnings = append(warnings, fmt.Sprintf("failed to umount %s: %v", mqueuePath, err))
}
}
}
if len(warnings) > 0 {
logrus.Warnf("failed to cleanup ipc mounts:\n%v", strings.Join(warnings, "\n"))
}
}
func (container *Container) ipcMounts() []execdriver.Mount {
var mounts []execdriver.Mount
if !container.hasMountFor("/dev/shm") {
label.SetFileLabel(container.ShmPath, container.MountLabel)
mounts = append(mounts, execdriver.Mount{
Source: container.ShmPath,
Destination: "/dev/shm",
Writable: true,
Private: true,
})
}
if !container.hasMountFor("/dev/mqueue") {
label.SetFileLabel(container.MqueuePath, container.MountLabel)
mounts = append(mounts, execdriver.Mount{
Source: container.MqueuePath,
Destination: "/dev/mqueue",
Writable: true,
Private: true,
})
}
return mounts
}
func detachMounted(path string) error {
return syscall.Unmount(path, syscall.MNT_DETACH)
}