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Windows: Refactor container

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Signed-off-by: John Howard <jhoward@microsoft.com>
This commit is contained in:
John Howard 2015-04-29 15:53:35 -07:00
parent a9172f572e
commit b9e4b95788
8 changed files with 1159 additions and 918 deletions
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869
daemon/container.go
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@ -1,22 +1,18 @@
package daemon
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"path"
"path/filepath"
"strings"
"sync"
"syscall"
"time"
"github.com/docker/libcontainer/configs"
"github.com/docker/libcontainer/devices"
"github.com/docker/libcontainer/label"
"github.com/Sirupsen/logrus"
@ -24,27 +20,17 @@ import (
"github.com/docker/docker/daemon/logger"
"github.com/docker/docker/daemon/logger/jsonfilelog"
"github.com/docker/docker/daemon/network"
"github.com/docker/docker/daemon/networkdriver/bridge"
"github.com/docker/docker/image"
"github.com/docker/docker/links"
"github.com/docker/docker/nat"
"github.com/docker/docker/pkg/archive"
"github.com/docker/docker/pkg/broadcastwriter"
"github.com/docker/docker/pkg/directory"
"github.com/docker/docker/pkg/etchosts"
"github.com/docker/docker/pkg/ioutils"
"github.com/docker/docker/pkg/jsonlog"
"github.com/docker/docker/pkg/promise"
"github.com/docker/docker/pkg/resolvconf"
"github.com/docker/docker/pkg/stringid"
"github.com/docker/docker/pkg/symlink"
"github.com/docker/docker/pkg/ulimit"
"github.com/docker/docker/runconfig"
"github.com/docker/docker/utils"
)
const DefaultPathEnv = "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
var (
ErrNotATTY = errors.New("The PTY is not a file")
ErrNoTTY = errors.New("No PTY found")
@ -59,7 +45,9 @@ type StreamConfig struct {
stdinPipe io.WriteCloser
}
type Container struct {
// CommonContainer holds the settings for a container which are applicable
// across all platforms supported by the daemon.
type CommonContainer struct {
*State `json:"State"` // Needed for remote api version <= 1.11
root string // Path to the "home" of the container, including metadata.
basefs string // Path to the graphdriver mountpoint
@ -89,26 +77,20 @@ type Container struct {
daemon *Daemon
MountLabel, ProcessLabel string
AppArmorProfile string
RestartCount int
UpdateDns bool
// Maps container paths to volume paths. The key in this is the path to which
// the volume is being mounted inside the container. Value is the path of the
// volume on disk
Volumes map[string]string
// Store rw/ro in a separate structure to preserve reverse-compatibility on-disk.
// Easier than migrating older container configs :)
VolumesRW map[string]bool
Volumes map[string]string
hostConfig *runconfig.HostConfig
activeLinks map[string]*links.Link
monitor *containerMonitor
execCommands *execStore
// logDriver for closing
logDriver logger.Logger
logCopier *logger.Copier
AppliedVolumesFrom map[string]struct{}
logDriver logger.Logger
logCopier *logger.Copier
}
func (container *Container) FromDisk() error {
@ -244,193 +226,6 @@ func (container *Container) GetRootResourcePath(path string) (string, error) {
return symlink.FollowSymlinkInScope(filepath.Join(container.root, cleanPath), container.root)
}
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, fmt.Errorf("error gathering device information while adding custom device %q: %s", deviceMapping.PathOnHost, err)
}
func populateCommand(c *Container, env []string) error {
en := &execdriver.Network{
Mtu: c.daemon.config.Mtu,
Interface: nil,
}
parts := strings.SplitN(string(c.hostConfig.NetworkMode), ":", 2)
switch parts[0] {
case "none":
case "host":
en.HostNetworking = true
case "bridge", "": // empty string to support existing containers
if !c.Config.NetworkDisabled {
network := c.NetworkSettings
en.Interface = &execdriver.NetworkInterface{
Gateway: network.Gateway,
Bridge: network.Bridge,
IPAddress: network.IPAddress,
IPPrefixLen: network.IPPrefixLen,
MacAddress: network.MacAddress,
LinkLocalIPv6Address: network.LinkLocalIPv6Address,
GlobalIPv6Address: network.GlobalIPv6Address,
GlobalIPv6PrefixLen: network.GlobalIPv6PrefixLen,
IPv6Gateway: network.IPv6Gateway,
HairpinMode: network.HairpinMode,
}
}
case "container":
nc, err := c.getNetworkedContainer()
if err != nil {
return err
}
en.ContainerID = nc.ID
default:
return fmt.Errorf("invalid network mode: %s", c.hostConfig.NetworkMode)
}
ipc := &execdriver.Ipc{}
if c.hostConfig.IpcMode.IsContainer() {
ic, err := c.getIpcContainer()
if err != nil {
return err
}
ipc.ContainerID = ic.ID
} else {
ipc.HostIpc = c.hostConfig.IpcMode.IsHost()
}
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 := append(configs.DefaultAllowedDevices, userSpecifiedDevices...)
autoCreatedDevices := append(configs.DefaultAutoCreatedDevices, userSpecifiedDevices...)
// TODO: this can be removed after lxc-conf is fully deprecated
lxcConfig, err := mergeLxcConfIntoOptions(c.hostConfig)
if err != nil {
return err
}
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 c.daemon.config.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{
Memory: c.hostConfig.Memory,
MemorySwap: c.hostConfig.MemorySwap,
CpuShares: c.hostConfig.CpuShares,
CpusetCpus: c.hostConfig.CpusetCpus,
CpusetMems: c.hostConfig.CpusetMems,
CpuPeriod: c.hostConfig.CpuPeriod,
CpuQuota: c.hostConfig.CpuQuota,
BlkioWeight: c.hostConfig.BlkioWeight,
Rlimits: rlimits,
OomKillDisable: c.hostConfig.OomKillDisable,
}
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
c.command = &execdriver.Command{
ID: c.ID,
Rootfs: c.RootfsPath(),
ReadonlyRootfs: c.hostConfig.ReadonlyRootfs,
InitPath: "/.dockerinit",
WorkingDir: c.Config.WorkingDir,
Network: en,
Ipc: ipc,
Pid: pid,
UTS: uts,
Resources: resources,
AllowedDevices: allowedDevices,
AutoCreatedDevices: autoCreatedDevices,
CapAdd: c.hostConfig.CapAdd,
CapDrop: c.hostConfig.CapDrop,
ProcessConfig: processConfig,
ProcessLabel: c.GetProcessLabel(),
MountLabel: c.GetMountLabel(),
LxcConfig: lxcConfig,
AppArmorProfile: c.AppArmorProfile,
CgroupParent: c.hostConfig.CgroupParent,
}
return nil
}
func (container *Container) Start() (err error) {
container.Lock()
defer container.Unlock()
@ -546,183 +341,16 @@ func (streamConfig *StreamConfig) StderrLogPipe() io.ReadCloser {
return ioutils.NewBufReader(reader)
}
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 (container *Container) buildHostsFiles(IP string) error {
hostsPath, err := container.GetRootResourcePath("hosts")
if err != nil {
return err
}
container.HostsPath = hostsPath
var extraContent []etchosts.Record
children, err := container.daemon.Children(container.Name)
if err != nil {
return err
}
for linkAlias, child := range children {
_, 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:]
}
extraContent = append(extraContent, etchosts.Record{Hosts: aliasList, IP: child.NetworkSettings.IPAddress})
}
for _, extraHost := range container.hostConfig.ExtraHosts {
// allow IPv6 addresses in extra hosts; only split on first ":"
parts := strings.SplitN(extraHost, ":", 2)
extraContent = append(extraContent, etchosts.Record{Hosts: parts[0], IP: parts[1]})
}
return etchosts.Build(container.HostsPath, IP, container.Config.Hostname, container.Config.Domainname, extraContent)
}
func (container *Container) buildHostnameAndHostsFiles(IP string) error {
if err := container.buildHostnameFile(); err != nil {
return err
}
return container.buildHostsFiles(IP)
}
func (container *Container) AllocateNetwork() error {
mode := container.hostConfig.NetworkMode
if container.Config.NetworkDisabled || !mode.IsPrivate() {
return nil
}
var err error
networkSettings, err := bridge.Allocate(container.ID, container.Config.MacAddress, "", "")
if err != nil {
return err
}
// Error handling: At this point, the interface is allocated so we have to
// make sure that it is always released in case of error, otherwise we
// might leak resources.
if container.Config.PortSpecs != nil {
if err = migratePortMappings(container.Config, container.hostConfig); err != nil {
bridge.Release(container.ID)
return err
}
container.Config.PortSpecs = nil
if err = container.WriteHostConfig(); err != nil {
bridge.Release(container.ID)
return err
}
}
var (
portSpecs = make(nat.PortSet)
bindings = make(nat.PortMap)
)
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,
})
}
}
}
container.NetworkSettings.PortMapping = nil
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 {
if err = container.allocatePort(port, bindings); err != nil {
bridge.Release(container.ID)
return err
}
}
container.WriteHostConfig()
networkSettings.Ports = bindings
container.NetworkSettings = networkSettings
return nil
}
func (container *Container) ReleaseNetwork() {
if container.Config.NetworkDisabled || !container.hostConfig.NetworkMode.IsPrivate() {
return
}
bridge.Release(container.ID)
container.NetworkSettings = &network.Settings{}
}
func (container *Container) isNetworkAllocated() bool {
return container.NetworkSettings.IPAddress != ""
}
func (container *Container) RestoreNetwork() error {
mode := container.hostConfig.NetworkMode
// Don't attempt a restore if we previously didn't allocate networking.
// This might be a legacy container with no network allocated, in which case the
// allocation will happen once and for all at start.
if !container.isNetworkAllocated() || container.Config.NetworkDisabled || !mode.IsPrivate() {
return nil
}
// Re-allocate the interface with the same IP and MAC address.
if _, err := bridge.Allocate(container.ID, container.NetworkSettings.MacAddress, container.NetworkSettings.IPAddress, ""); err != nil {
return err
}
// Re-allocate any previously allocated ports.
for port := range container.NetworkSettings.Ports {
if err := container.allocatePort(port, container.NetworkSettings.Ports); err != nil {
return err
}
}
return nil
}
// cleanup releases any network resources allocated to the container along with any rules
// around how containers are linked together. It also unmounts the container's root filesystem.
func (container *Container) cleanup() {
container.ReleaseNetwork()
// Disable all active links
if container.activeLinks != nil {
for _, link := range container.activeLinks {
link.Disable()
}
}
disableAllActiveLinks(container)
if err := container.Unmount(); err != nil {
logrus.Errorf("%v: Failed to umount filesystem: %v", container.ID, err)
@ -824,17 +452,8 @@ func (container *Container) Kill() error {
}
// 2. Wait for the process to die, in last resort, try to kill the process directly
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)
}
}
if err := killProcessDirectly(container); err != nil {
return err
}
container.WaitStop(-1 * time.Second)
@ -887,26 +506,6 @@ func (container *Container) Resize(h, w int) error {
return container.command.ProcessConfig.Terminal.Resize(h, w)
}
func (container *Container) ExportRw() (archive.Archive, error) {
if err := container.Mount(); err != nil {
return nil, err
}
if container.daemon == nil {
return nil, fmt.Errorf("Can't load storage driver for unregistered container %s", container.ID)
}
archive, err := container.daemon.Diff(container)
if err != nil {
container.Unmount()
return nil, err
}
return ioutils.NewReadCloserWrapper(archive, func() error {
err := archive.Close()
container.Unmount()
return err
}),
nil
}
func (container *Container) Export() (archive.Archive, error) {
if err := container.Mount(); err != nil {
return nil, err
@ -971,37 +570,6 @@ func validateID(id string) error {
return nil
}
// GetSize, return real size, virtual size
func (container *Container) GetSize() (int64, int64) {
var (
sizeRw, sizeRootfs int64
err error
driver = container.daemon.driver
)
if err := container.Mount(); err != nil {
logrus.Errorf("Failed to compute size of container rootfs %s: %s", container.ID, err)
return sizeRw, sizeRootfs
}
defer container.Unmount()
initID := fmt.Sprintf("%s-init", container.ID)
sizeRw, err = driver.DiffSize(container.ID, initID)
if err != nil {
logrus.Errorf("Driver %s couldn't return diff size of container %s: %s", 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
}
func (container *Container) Copy(resource string) (io.ReadCloser, error) {
container.Lock()
defer container.Unlock()
@ -1036,12 +604,12 @@ func (container *Container) Copy(resource string) (io.ReadCloser, error) {
}
var filter []string
if !stat.IsDir() {
d, f := path.Split(basePath)
d, f := filepath.Split(basePath)
basePath = d
filter = []string{f}
} else {
filter = []string{path.Base(basePath)}
basePath = path.Dir(basePath)
filter = []string{filepath.Base(basePath)}
basePath = filepath.Dir(basePath)
}
archive, err := archive.TarWithOptions(basePath, &archive.TarOptions{
@ -1075,367 +643,6 @@ func (container *Container) SetHostConfig(hostConfig *runconfig.HostConfig) {
container.hostConfig = hostConfig
}
func (container *Container) DisableLink(name string) {
if container.activeLinks != nil {
if link, exists := container.activeLinks[name]; exists {
link.Disable()
} else {
logrus.Debugf("Could not find active link for %s", name)
}
}
}
func (container *Container) setupContainerDns() error {
if container.ResolvConfPath != "" {
// check if this is an existing container that needs DNS update:
if container.UpdateDns {
// read the host's resolv.conf, get the hash and call updateResolvConf
logrus.Debugf("Check container (%s) for update to resolv.conf - UpdateDns flag was set", container.ID)
latestResolvConf, latestHash := resolvconf.GetLastModified()
// clean container resolv.conf re: localhost nameservers and IPv6 NS (if IPv6 disabled)
updatedResolvConf, modified := resolvconf.FilterResolvDns(latestResolvConf, container.daemon.config.Bridge.EnableIPv6)
if modified {
// changes have occurred during resolv.conf localhost cleanup: generate an updated hash
newHash, err := ioutils.HashData(bytes.NewReader(updatedResolvConf))
if err != nil {
return err
}
latestHash = newHash
}
if err := container.updateResolvConf(updatedResolvConf, latestHash); err != nil {
return err
}
// successful update of the restarting container; set the flag off
container.UpdateDns = false
}
return nil
}
var (
config = container.hostConfig
daemon = container.daemon
)
resolvConf, err := resolvconf.Get()
if err != nil {
return err
}
container.ResolvConfPath, err = container.GetRootResourcePath("resolv.conf")
if err != nil {
return err
}
if config.NetworkMode.IsBridge() || config.NetworkMode.IsNone() {
// check configurations for any container/daemon dns settings
if len(config.Dns) > 0 || len(daemon.config.Dns) > 0 || len(config.DnsSearch) > 0 || len(daemon.config.DnsSearch) > 0 {
var (
dns = resolvconf.GetNameservers(resolvConf)
dnsSearch = resolvconf.GetSearchDomains(resolvConf)
)
if len(config.Dns) > 0 {
dns = config.Dns
} else if len(daemon.config.Dns) > 0 {
dns = daemon.config.Dns
}
if len(config.DnsSearch) > 0 {
dnsSearch = config.DnsSearch
} else if len(daemon.config.DnsSearch) > 0 {
dnsSearch = daemon.config.DnsSearch
}
return resolvconf.Build(container.ResolvConfPath, dns, dnsSearch)
}
// replace any localhost/127.*, and remove IPv6 nameservers if IPv6 disabled in daemon
resolvConf, _ = resolvconf.FilterResolvDns(resolvConf, daemon.config.Bridge.EnableIPv6)
}
//get a sha256 hash of the resolv conf at this point so we can check
//for changes when the host resolv.conf changes (e.g. network update)
resolvHash, err := ioutils.HashData(bytes.NewReader(resolvConf))
if err != nil {
return err
}
resolvHashFile := container.ResolvConfPath + ".hash"
if err = ioutil.WriteFile(resolvHashFile, []byte(resolvHash), 0644); err != nil {
return err
}
return ioutil.WriteFile(container.ResolvConfPath, resolvConf, 0644)
}
// called when the host's resolv.conf changes to check whether container's resolv.conf
// is unchanged by the container "user" since container start: if unchanged, the
// container's resolv.conf will be updated to match the host's new resolv.conf
func (container *Container) updateResolvConf(updatedResolvConf []byte, newResolvHash string) error {
if container.ResolvConfPath == "" {
return nil
}
if container.Running {
//set a marker in the hostConfig to update on next start/restart
container.UpdateDns = true
return nil
}
resolvHashFile := container.ResolvConfPath + ".hash"
//read the container's current resolv.conf and compute the hash
resolvBytes, err := ioutil.ReadFile(container.ResolvConfPath)
if err != nil {
return err
}
curHash, err := ioutils.HashData(bytes.NewReader(resolvBytes))
if err != nil {
return err
}
//read the hash from the last time we wrote resolv.conf in the container
hashBytes, err := ioutil.ReadFile(resolvHashFile)
if err != nil {
if !os.IsNotExist(err) {
return err
}
// backwards compat: if no hash file exists, this container pre-existed from
// a Docker daemon that didn't contain this update feature. Given we can't know
// if the user has modified the resolv.conf since container start time, safer
// to just never update the container's resolv.conf during it's lifetime which
// we can control by setting hashBytes to an empty string
hashBytes = []byte("")
}
//if the user has not modified the resolv.conf of the container since we wrote it last
//we will replace it with the updated resolv.conf from the host
if string(hashBytes) == curHash {
logrus.Debugf("replacing %q with updated host resolv.conf", container.ResolvConfPath)
// for atomic updates to these files, use temporary files with os.Rename:
dir := path.Dir(container.ResolvConfPath)
tmpHashFile, err := ioutil.TempFile(dir, "hash")
if err != nil {
return err
}
tmpResolvFile, err := ioutil.TempFile(dir, "resolv")
if err != nil {
return err
}
// write the updates to the temp files
if err = ioutil.WriteFile(tmpHashFile.Name(), []byte(newResolvHash), 0644); err != nil {
return err
}
if err = ioutil.WriteFile(tmpResolvFile.Name(), updatedResolvConf, 0644); err != nil {
return err
}
// rename the temp files for atomic replace
if err = os.Rename(tmpHashFile.Name(), resolvHashFile); err != nil {
return err
}
return os.Rename(tmpResolvFile.Name(), container.ResolvConfPath)
}
return nil
}
func (container *Container) updateParentsHosts() error {
refs := container.daemon.ContainerGraph().RefPaths(container.ID)
for _, ref := range refs {
if ref.ParentID == "0" {
continue
}
c, err := container.daemon.Get(ref.ParentID)
if err != nil {
logrus.Error(err)
}
if c != nil && !container.daemon.config.DisableNetwork && container.hostConfig.NetworkMode.IsPrivate() {
logrus.Debugf("Update /etc/hosts of %s for alias %s with ip %s", c.ID, ref.Name, container.NetworkSettings.IPAddress)
if err := etchosts.Update(c.HostsPath, container.NetworkSettings.IPAddress, ref.Name); err != nil {
logrus.Errorf("Failed to update /etc/hosts in parent container %s for alias %s: %v", c.ID, ref.Name, err)
}
}
}
return nil
}
func (container *Container) initializeNetworking() error {
var err error
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]
}
content, err := ioutil.ReadFile("/etc/hosts")
if os.IsNotExist(err) {
return container.buildHostnameAndHostsFiles("")
} else if err != nil {
return err
}
if err := container.buildHostnameFile(); err != nil {
return err
}
hostsPath, err := container.GetRootResourcePath("hosts")
if err != nil {
return err
}
container.HostsPath = hostsPath
return ioutil.WriteFile(container.HostsPath, content, 0644)
}
if container.hostConfig.NetworkMode.IsContainer() {
// we need to get the hosts files from the container to join
nc, err := container.getNetworkedContainer()
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.daemon.config.DisableNetwork {
container.Config.NetworkDisabled = true
return container.buildHostnameAndHostsFiles("127.0.1.1")
}
if err := container.AllocateNetwork(); err != nil {
return err
}
return container.buildHostnameAndHostsFiles(container.NetworkSettings.IPAddress)
}
// Make sure the config is compatible with the current kernel
func (container *Container) verifyDaemonSettings() {
if container.hostConfig.Memory > 0 && !container.daemon.sysInfo.MemoryLimit {
logrus.Warnf("Your kernel does not support memory limit capabilities. Limitation discarded.")
container.hostConfig.Memory = 0
}
if container.hostConfig.Memory > 0 && container.hostConfig.MemorySwap != -1 && !container.daemon.sysInfo.SwapLimit {
logrus.Warnf("Your kernel does not support swap limit capabilities. Limitation discarded.")
container.hostConfig.MemorySwap = -1
}
if container.daemon.sysInfo.IPv4ForwardingDisabled {
logrus.Warnf("IPv4 forwarding is disabled. Networking will not work")
}
}
func (container *Container) setupLinkedContainers() ([]string, error) {
var (
env []string
daemon = container.daemon
)
children, err := daemon.Children(container.Name)
if err != nil {
return nil, err
}
if len(children) > 0 {
container.activeLinks = make(map[string]*links.Link, len(children))
// If we encounter an error make sure that we rollback any network
// config and iptables changes
rollback := func() {
for _, link := range container.activeLinks {
link.Disable()
}
container.activeLinks = nil
}
for linkAlias, child := range children {
if !child.IsRunning() {
return nil, fmt.Errorf("Cannot link to a non running container: %s AS %s", child.Name, linkAlias)
}
link, err := links.NewLink(
container.NetworkSettings.IPAddress,
child.NetworkSettings.IPAddress,
linkAlias,
child.Config.Env,
child.Config.ExposedPorts,
)
if err != nil {
rollback()
return nil, err
}
container.activeLinks[link.Alias()] = link
if err := link.Enable(); err != nil {
rollback()
return nil, err
}
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 (container *Container) setupWorkingDirectory() error {
if container.Config.WorkingDir != "" {
container.Config.WorkingDir = path.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 := os.MkdirAll(pth, 0755); err != nil {
return err
}
}
if pthInfo != nil && !pthInfo.IsDir() {
return fmt.Errorf("Cannot mkdir: %s is not a directory", container.Config.WorkingDir)
}
}
return nil
}
func (container *Container) getLogConfig() runconfig.LogConfig {
cfg := container.hostConfig.LogConfig
if cfg.Type != "" { // container has log driver configured
@ -1507,23 +714,6 @@ func (container *Container) waitForStart() error {
return nil
}
func (container *Container) allocatePort(port nat.Port, bindings nat.PortMap) error {
binding := bindings[port]
if container.hostConfig.PublishAllPorts && len(binding) == 0 {
binding = append(binding, nat.PortBinding{})
}
for i := 0; i < len(binding); i++ {
b, err := bridge.AllocatePort(container.ID, port, binding[i])
if err != nil {
return err
}
binding[i] = b
}
bindings[port] = binding
return nil
}
func (container *Container) GetProcessLabel() string {
// even if we have a process label return "" if we are running
// in privileged mode
@ -1540,41 +730,6 @@ func (container *Container) GetMountLabel() string {
return container.MountLabel
}
func (container *Container) getIpcContainer() (*Container, error) {
containerID := container.hostConfig.IpcMode.Container()
c, err := container.daemon.Get(containerID)
if err != nil {
return nil, err
}
if !c.IsRunning() {
return nil, fmt.Errorf("cannot join IPC of a non running container: %s", containerID)
}
return c, nil
}
func (container *Container) getNetworkedContainer() (*Container, error) {
parts := strings.SplitN(string(container.hostConfig.NetworkMode), ":", 2)
switch parts[0] {
case "container":
if len(parts) != 2 {
return nil, fmt.Errorf("no container specified to join network")
}
nc, err := container.daemon.Get(parts[1])
if err != nil {
return nil, err
}
if container == nc {
return nil, fmt.Errorf("cannot join own network")
}
if !nc.IsRunning() {
return nil, fmt.Errorf("cannot join network of a non running container: %s", parts[1])
}
return nc, nil
default:
return nil, fmt.Errorf("network mode not set to container")
}
}
func (container *Container) Stats() (*execdriver.ResourceStats, error) {
return container.daemon.Stats(container)
}

885
daemon/container_linux.go Normal file
View file

@ -0,0 +1,885 @@
// +build linux
package daemon
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"syscall"
"time"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/daemon/execdriver"
"github.com/docker/docker/daemon/network"
"github.com/docker/docker/daemon/networkdriver/bridge"
"github.com/docker/docker/links"
"github.com/docker/docker/nat"
"github.com/docker/docker/pkg/archive"
"github.com/docker/docker/pkg/directory"
"github.com/docker/docker/pkg/etchosts"
"github.com/docker/docker/pkg/ioutils"
"github.com/docker/docker/pkg/resolvconf"
"github.com/docker/docker/pkg/stringid"
"github.com/docker/docker/pkg/ulimit"
"github.com/docker/docker/runconfig"
"github.com/docker/docker/utils"
"github.com/docker/libcontainer/configs"
"github.com/docker/libcontainer/devices"
)
const DefaultPathEnv = "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
type Container struct {
CommonContainer
// Fields below here are platform specific.
AppArmorProfile string
// Store rw/ro in a separate structure to preserve reverse-compatibility on-disk.
// Easier than migrating older container configs :)
VolumesRW map[string]bool
AppliedVolumesFrom map[string]struct{}
activeLinks map[string]*links.Link
}
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 (container *Container) setupContainerDns() error {
if container.ResolvConfPath != "" {
// check if this is an existing container that needs DNS update:
if container.UpdateDns {
// read the host's resolv.conf, get the hash and call updateResolvConf
logrus.Debugf("Check container (%s) for update to resolv.conf - UpdateDns flag was set", container.ID)
latestResolvConf, latestHash := resolvconf.GetLastModified()
// clean container resolv.conf re: localhost nameservers and IPv6 NS (if IPv6 disabled)
updatedResolvConf, modified := resolvconf.FilterResolvDns(latestResolvConf, container.daemon.config.Bridge.EnableIPv6)
if modified {
// changes have occurred during resolv.conf localhost cleanup: generate an updated hash
newHash, err := ioutils.HashData(bytes.NewReader(updatedResolvConf))
if err != nil {
return err
}
latestHash = newHash
}
if err := container.updateResolvConf(updatedResolvConf, latestHash); err != nil {
return err
}
// successful update of the restarting container; set the flag off
container.UpdateDns = false
}
return nil
}
var (
config = container.hostConfig
daemon = container.daemon
)
resolvConf, err := resolvconf.Get()
if err != nil {
return err
}
container.ResolvConfPath, err = container.GetRootResourcePath("resolv.conf")
if err != nil {
return err
}
if config.NetworkMode.IsBridge() || config.NetworkMode.IsNone() {
// check configurations for any container/daemon dns settings
if len(config.Dns) > 0 || len(daemon.config.Dns) > 0 || len(config.DnsSearch) > 0 || len(daemon.config.DnsSearch) > 0 {
var (
dns = resolvconf.GetNameservers(resolvConf)
dnsSearch = resolvconf.GetSearchDomains(resolvConf)
)
if len(config.Dns) > 0 {
dns = config.Dns
} else if len(daemon.config.Dns) > 0 {
dns = daemon.config.Dns
}
if len(config.DnsSearch) > 0 {
dnsSearch = config.DnsSearch
} else if len(daemon.config.DnsSearch) > 0 {
dnsSearch = daemon.config.DnsSearch
}
return resolvconf.Build(container.ResolvConfPath, dns, dnsSearch)
}
// replace any localhost/127.*, and remove IPv6 nameservers if IPv6 disabled in daemon
resolvConf, _ = resolvconf.FilterResolvDns(resolvConf, daemon.config.Bridge.EnableIPv6)
}
//get a sha256 hash of the resolv conf at this point so we can check
//for changes when the host resolv.conf changes (e.g. network update)
resolvHash, err := ioutils.HashData(bytes.NewReader(resolvConf))
if err != nil {
return err
}
resolvHashFile := container.ResolvConfPath + ".hash"
if err = ioutil.WriteFile(resolvHashFile, []byte(resolvHash), 0644); err != nil {
return err
}
return ioutil.WriteFile(container.ResolvConfPath, resolvConf, 0644)
}
// called when the host's resolv.conf changes to check whether container's resolv.conf
// is unchanged by the container "user" since container start: if unchanged, the
// container's resolv.conf will be updated to match the host's new resolv.conf
func (container *Container) updateResolvConf(updatedResolvConf []byte, newResolvHash string) error {
if container.ResolvConfPath == "" {
return nil
}
if container.Running {
//set a marker in the hostConfig to update on next start/restart
container.UpdateDns = true
return nil
}
resolvHashFile := container.ResolvConfPath + ".hash"
//read the container's current resolv.conf and compute the hash
resolvBytes, err := ioutil.ReadFile(container.ResolvConfPath)
if err != nil {
return err
}
curHash, err := ioutils.HashData(bytes.NewReader(resolvBytes))
if err != nil {
return err
}
//read the hash from the last time we wrote resolv.conf in the container
hashBytes, err := ioutil.ReadFile(resolvHashFile)
if err != nil {
if !os.IsNotExist(err) {
return err
}
// backwards compat: if no hash file exists, this container pre-existed from
// a Docker daemon that didn't contain this update feature. Given we can't know
// if the user has modified the resolv.conf since container start time, safer
// to just never update the container's resolv.conf during it's lifetime which
// we can control by setting hashBytes to an empty string
hashBytes = []byte("")
}
//if the user has not modified the resolv.conf of the container since we wrote it last
//we will replace it with the updated resolv.conf from the host
if string(hashBytes) == curHash {
logrus.Debugf("replacing %q with updated host resolv.conf", container.ResolvConfPath)
// for atomic updates to these files, use temporary files with os.Rename:
dir := filepath.Dir(container.ResolvConfPath)
tmpHashFile, err := ioutil.TempFile(dir, "hash")
if err != nil {
return err
}
tmpResolvFile, err := ioutil.TempFile(dir, "resolv")
if err != nil {
return err
}
// write the updates to the temp files
if err = ioutil.WriteFile(tmpHashFile.Name(), []byte(newResolvHash), 0644); err != nil {
return err
}
if err = ioutil.WriteFile(tmpResolvFile.Name(), updatedResolvConf, 0644); err != nil {
return err
}
// rename the temp files for atomic replace
if err = os.Rename(tmpHashFile.Name(), resolvHashFile); err != nil {
return err
}
return os.Rename(tmpResolvFile.Name(), container.ResolvConfPath)
}
return nil
}
func (container *Container) updateParentsHosts() error {
refs := container.daemon.ContainerGraph().RefPaths(container.ID)
for _, ref := range refs {
if ref.ParentID == "0" {
continue
}
c, err := container.daemon.Get(ref.ParentID)
if err != nil {
logrus.Error(err)
}
if c != nil && !container.daemon.config.DisableNetwork && container.hostConfig.NetworkMode.IsPrivate() {
logrus.Debugf("Update /etc/hosts of %s for alias %s with ip %s", c.ID, ref.Name, container.NetworkSettings.IPAddress)
if err := etchosts.Update(c.HostsPath, container.NetworkSettings.IPAddress, ref.Name); err != nil {
logrus.Errorf("Failed to update /etc/hosts in parent container %s for alias %s: %v", c.ID, ref.Name, err)
}
}
}
return nil
}
func (container *Container) setupLinkedContainers() ([]string, error) {
var (
env []string
daemon = container.daemon
)
children, err := daemon.Children(container.Name)
if err != nil {
return nil, err
}
if len(children) > 0 {
container.activeLinks = make(map[string]*links.Link, len(children))
// If we encounter an error make sure that we rollback any network
// config and iptables changes
rollback := func() {
for _, link := range container.activeLinks {
link.Disable()
}
container.activeLinks = nil
}
for linkAlias, child := range children {
if !child.IsRunning() {
return nil, fmt.Errorf("Cannot link to a non running container: %s AS %s", child.Name, linkAlias)
}
link, err := links.NewLink(
container.NetworkSettings.IPAddress,
child.NetworkSettings.IPAddress,
linkAlias,
child.Config.Env,
child.Config.ExposedPorts,
)
if err != nil {
rollback()
return nil, err
}
container.activeLinks[link.Alias()] = link
if err := link.Enable(); err != nil {
rollback()
return nil, err
}
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, fmt.Errorf("error gathering device information while adding custom device %q: %s", deviceMapping.PathOnHost, err)
}
func populateCommand(c *Container, env []string) error {
en := &execdriver.Network{
Mtu: c.daemon.config.Mtu,
Interface: nil,
}
parts := strings.SplitN(string(c.hostConfig.NetworkMode), ":", 2)
switch parts[0] {
case "none":
case "host":
en.HostNetworking = true
case "bridge", "": // empty string to support existing containers
if !c.Config.NetworkDisabled {
network := c.NetworkSettings
en.Interface = &execdriver.NetworkInterface{
Gateway: network.Gateway,
Bridge: network.Bridge,
IPAddress: network.IPAddress,
IPPrefixLen: network.IPPrefixLen,
MacAddress: network.MacAddress,
LinkLocalIPv6Address: network.LinkLocalIPv6Address,
GlobalIPv6Address: network.GlobalIPv6Address,
GlobalIPv6PrefixLen: network.GlobalIPv6PrefixLen,
IPv6Gateway: network.IPv6Gateway,
HairpinMode: network.HairpinMode,
}
}
case "container":
nc, err := c.getNetworkedContainer()
if err != nil {
return err
}
en.ContainerID = nc.ID
default:
return fmt.Errorf("invalid network mode: %s", c.hostConfig.NetworkMode)
}
ipc := &execdriver.Ipc{}
if c.hostConfig.IpcMode.IsContainer() {
ic, err := c.getIpcContainer()
if err != nil {
return err
}
ipc.ContainerID = ic.ID
} else {
ipc.HostIpc = c.hostConfig.IpcMode.IsHost()
}
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 := append(configs.DefaultAllowedDevices, userSpecifiedDevices...)
autoCreatedDevices := append(configs.DefaultAutoCreatedDevices, userSpecifiedDevices...)
// TODO: this can be removed after lxc-conf is fully deprecated
lxcConfig, err := mergeLxcConfIntoOptions(c.hostConfig)
if err != nil {
return err
}
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 c.daemon.config.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{
Memory: c.hostConfig.Memory,
MemorySwap: c.hostConfig.MemorySwap,
CpuShares: c.hostConfig.CpuShares,
CpusetCpus: c.hostConfig.CpusetCpus,
CpusetMems: c.hostConfig.CpusetMems,
CpuPeriod: c.hostConfig.CpuPeriod,
CpuQuota: c.hostConfig.CpuQuota,
BlkioWeight: c.hostConfig.BlkioWeight,
Rlimits: rlimits,
OomKillDisable: c.hostConfig.OomKillDisable,
}
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
c.command = &execdriver.Command{
ID: c.ID,
Rootfs: c.RootfsPath(),
ReadonlyRootfs: c.hostConfig.ReadonlyRootfs,
InitPath: "/.dockerinit",
WorkingDir: c.Config.WorkingDir,
Network: en,
Ipc: ipc,
Pid: pid,
UTS: uts,
Resources: resources,
AllowedDevices: allowedDevices,
AutoCreatedDevices: autoCreatedDevices,
CapAdd: c.hostConfig.CapAdd,
CapDrop: c.hostConfig.CapDrop,
ProcessConfig: processConfig,
ProcessLabel: c.GetProcessLabel(),
MountLabel: c.GetMountLabel(),
LxcConfig: lxcConfig,
AppArmorProfile: c.AppArmorProfile,
CgroupParent: c.hostConfig.CgroupParent,
}
return nil
}
// GetSize, return real size, virtual size
func (container *Container) GetSize() (int64, int64) {
var (
sizeRw, sizeRootfs int64
err error
driver = container.daemon.driver
)
if err := container.Mount(); err != nil {
logrus.Errorf("Failed to compute size of container rootfs %s: %s", container.ID, err)
return sizeRw, sizeRootfs
}
defer container.Unmount()
initID := fmt.Sprintf("%s-init", container.ID)
sizeRw, err = driver.DiffSize(container.ID, initID)
if err != nil {
logrus.Errorf("Driver %s couldn't return diff size of container %s: %s", 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
}
func (container *Container) AllocateNetwork() error {
mode := container.hostConfig.NetworkMode
if container.Config.NetworkDisabled || !mode.IsPrivate() {
return nil
}
var err error
networkSettings, err := bridge.Allocate(container.ID, container.Config.MacAddress, "", "")
if err != nil {
return err
}
// Error handling: At this point, the interface is allocated so we have to
// make sure that it is always released in case of error, otherwise we
// might leak resources.
if container.Config.PortSpecs != nil {
if err = migratePortMappings(container.Config, container.hostConfig); err != nil {
bridge.Release(container.ID)
return err
}
container.Config.PortSpecs = nil
if err = container.WriteHostConfig(); err != nil {
bridge.Release(container.ID)
return err
}
}
var (
portSpecs = make(nat.PortSet)
bindings = make(nat.PortMap)
)
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,
})
}
}
}
container.NetworkSettings.PortMapping = nil
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 {
if err = container.allocatePort(port, bindings); err != nil {
bridge.Release(container.ID)
return err
}
}
container.WriteHostConfig()
networkSettings.Ports = bindings
container.NetworkSettings = networkSettings
return nil
}
func (container *Container) initializeNetworking() error {
var err error
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]
}
content, err := ioutil.ReadFile("/etc/hosts")
if os.IsNotExist(err) {
return container.buildHostnameAndHostsFiles("")
} else if err != nil {
return err
}
if err := container.buildHostnameFile(); err != nil {
return err
}
hostsPath, err := container.GetRootResourcePath("hosts")
if err != nil {
return err
}
container.HostsPath = hostsPath
return ioutil.WriteFile(container.HostsPath, content, 0644)
}
if container.hostConfig.NetworkMode.IsContainer() {
// we need to get the hosts files from the container to join
nc, err := container.getNetworkedContainer()
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.daemon.config.DisableNetwork {
container.Config.NetworkDisabled = true
return container.buildHostnameAndHostsFiles("127.0.1.1")
}
if err := container.AllocateNetwork(); err != nil {
return err
}
return container.buildHostnameAndHostsFiles(container.NetworkSettings.IPAddress)
}
// Make sure the config is compatible with the current kernel
func (container *Container) verifyDaemonSettings() {
if container.hostConfig.Memory > 0 && !container.daemon.sysInfo.MemoryLimit {
logrus.Warnf("Your kernel does not support memory limit capabilities. Limitation discarded.")
container.hostConfig.Memory = 0
}
if container.hostConfig.Memory > 0 && container.hostConfig.MemorySwap != -1 && !container.daemon.sysInfo.SwapLimit {
logrus.Warnf("Your kernel does not support swap limit capabilities. Limitation discarded.")
container.hostConfig.MemorySwap = -1
}
if container.daemon.sysInfo.IPv4ForwardingDisabled {
logrus.Warnf("IPv4 forwarding is disabled. Networking will not work")
}
}
func (container *Container) ExportRw() (archive.Archive, error) {
if err := container.Mount(); err != nil {
return nil, err
}
if container.daemon == nil {
return nil, fmt.Errorf("Can't load storage driver for unregistered container %s", container.ID)
}
archive, err := container.daemon.Diff(container)
if err != nil {
container.Unmount()
return nil, err
}
return ioutils.NewReadCloserWrapper(archive, func() error {
err := archive.Close()
container.Unmount()
return err
}),
nil
}
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 (container *Container) buildHostsFiles(IP string) error {
hostsPath, err := container.GetRootResourcePath("hosts")
if err != nil {
return err
}
container.HostsPath = hostsPath
var extraContent []etchosts.Record
children, err := container.daemon.Children(container.Name)
if err != nil {
return err
}
for linkAlias, child := range children {
_, alias := filepath.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:]
}
extraContent = append(extraContent, etchosts.Record{Hosts: aliasList, IP: child.NetworkSettings.IPAddress})
}
for _, extraHost := range container.hostConfig.ExtraHosts {
// allow IPv6 addresses in extra hosts; only split on first ":"
parts := strings.SplitN(extraHost, ":", 2)
extraContent = append(extraContent, etchosts.Record{Hosts: parts[0], IP: parts[1]})
}
return etchosts.Build(container.HostsPath, IP, container.Config.Hostname, container.Config.Domainname, extraContent)
}
func (container *Container) buildHostnameAndHostsFiles(IP string) error {
if err := container.buildHostnameFile(); err != nil {
return err
}
return container.buildHostsFiles(IP)
}
func (container *Container) getIpcContainer() (*Container, error) {
containerID := container.hostConfig.IpcMode.Container()
c, err := container.daemon.Get(containerID)
if err != nil {
return nil, err
}
if !c.IsRunning() {
return nil, fmt.Errorf("cannot join IPC of a non running container: %s", containerID)
}
return c, nil
}
func (container *Container) setupWorkingDirectory() error {
if container.Config.WorkingDir != "" {
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 := os.MkdirAll(pth, 0755); err != nil {
return err
}
}
if pthInfo != nil && !pthInfo.IsDir() {
return fmt.Errorf("Cannot mkdir: %s is not a directory", container.Config.WorkingDir)
}
}
return nil
}
func (container *Container) allocatePort(port nat.Port, bindings nat.PortMap) error {
binding := bindings[port]
if container.hostConfig.PublishAllPorts && len(binding) == 0 {
binding = append(binding, nat.PortBinding{})
}
for i := 0; i < len(binding); i++ {
b, err := bridge.AllocatePort(container.ID, port, binding[i])
if err != nil {
return err
}
binding[i] = b
}
bindings[port] = binding
return nil
}
func (container *Container) getNetworkedContainer() (*Container, error) {
parts := strings.SplitN(string(container.hostConfig.NetworkMode), ":", 2)
switch parts[0] {
case "container":
if len(parts) != 2 {
return nil, fmt.Errorf("no container specified to join network")
}
nc, err := container.daemon.Get(parts[1])
if err != nil {
return nil, err
}
if container == nc {
return nil, fmt.Errorf("cannot join own network")
}
if !nc.IsRunning() {
return nil, fmt.Errorf("cannot join network of a non running container: %s", parts[1])
}
return nc, nil
default:
return nil, fmt.Errorf("network mode not set to container")
}
}
func (container *Container) ReleaseNetwork() {
if container.Config.NetworkDisabled || !container.hostConfig.NetworkMode.IsPrivate() {
return
}
bridge.Release(container.ID)
container.NetworkSettings = &network.Settings{}
}
func (container *Container) RestoreNetwork() error {
mode := container.hostConfig.NetworkMode
// Don't attempt a restore if we previously didn't allocate networking.
// This might be a legacy container with no network allocated, in which case the
// allocation will happen once and for all at start.
if !container.isNetworkAllocated() || container.Config.NetworkDisabled || !mode.IsPrivate() {
return nil
}
// Re-allocate the interface with the same IP and MAC address.
if _, err := bridge.Allocate(container.ID, container.NetworkSettings.MacAddress, container.NetworkSettings.IPAddress, ""); err != nil {
return err
}
// Re-allocate any previously allocated ports.
for port := range container.NetworkSettings.Ports {
if err := container.allocatePort(port, container.NetworkSettings.Ports); err != nil {
return err
}
}
return nil
}
func disableAllActiveLinks(container *Container) {
if container.activeLinks != nil {
for _, link := range container.activeLinks {
link.Disable()
}
}
}
func (container *Container) DisableLink(name string) {
if container.activeLinks != nil {
if link, exists := container.activeLinks[name]; exists {
link.Disable()
} else {
logrus.Debugf("Could not find active link for %s", name)
}
}
}

173
daemon/container_windows.go Normal file
View file

@ -0,0 +1,173 @@
// +build windows
package daemon
import (
"fmt"
"strings"
"github.com/docker/docker/daemon/execdriver"
"github.com/docker/docker/pkg/archive"
)
// TODO Windows. A reasonable default at the moment.
const DefaultPathEnv = `c:\windows\system32;c:\windows\system32\WindowsPowerShell\v1.0`
type Container struct {
CommonContainer
// Fields below here are platform specific.
// TODO Windows. Further factoring out of unused fields will be necessary.
// ---- START OF TEMPORARY DECLARATION ----
// TODO Windows. Temporarily keeping fields in to assist in compilation
// of the daemon on Windows without affecting many other files in a single
// PR, thus making code review significantly harder. These lines will be
// removed in subsequent PRs.
AppArmorProfile string
// Store rw/ro in a separate structure to preserve reverse-compatibility on-disk.
// Easier than migrating older container configs :)
VolumesRW map[string]bool
AppliedVolumesFrom map[string]struct{}
// ---- END OF TEMPORARY DECLARATION ----
}
func killProcessDirectly(container *Container) error {
return nil
}
func (container *Container) setupContainerDns() error {
return nil
}
func (container *Container) updateParentsHosts() error {
return nil
}
func (container *Container) setupLinkedContainers() ([]string, error) {
return nil, nil
}
func (container *Container) createDaemonEnvironment(linkedEnv []string) []string {
return nil
}
func (container *Container) initializeNetworking() error {
return nil
}
func (container *Container) setupWorkingDirectory() error {
return nil
}
func (container *Container) verifyDaemonSettings() {
}
func populateCommand(c *Container, env []string) error {
en := &execdriver.Network{
Mtu: c.daemon.config.Mtu,
Interface: nil,
}
// TODO Windows. Appropriate network mode (will refactor as part of
// libnetwork. For now, even through bridge not used, let it succeed to
// allow the Windows daemon to limp during its bring-up
parts := strings.SplitN(string(c.hostConfig.NetworkMode), ":", 2)
switch parts[0] {
case "none":
case "bridge", "": // empty string to support existing containers
if !c.Config.NetworkDisabled {
network := c.NetworkSettings
en.Interface = &execdriver.NetworkInterface{
Bridge: network.Bridge,
MacAddress: network.MacAddress,
}
}
case "host", "container":
return fmt.Errorf("unsupported network mode: %s", c.hostConfig.NetworkMode)
default:
return fmt.Errorf("invalid network mode: %s", c.hostConfig.NetworkMode)
}
pid := &execdriver.Pid{}
// TODO Windows. This can probably be factored out.
pid.HostPid = c.hostConfig.PidMode.IsHost()
// TODO Windows. Resource controls to be implemented later.
resources := &execdriver.Resources{}
// TODO Windows. Further refactoring required (privileged/user)
processConfig := execdriver.ProcessConfig{
Privileged: c.hostConfig.Privileged,
Entrypoint: c.Path,
Arguments: c.Args,
Tty: c.Config.Tty,
User: c.Config.User,
}
processConfig.Env = env
// TODO Windows: Factor out remainder of unused fields.
c.command = &execdriver.Command{
ID: c.ID,
Rootfs: c.RootfsPath(),
ReadonlyRootfs: c.hostConfig.ReadonlyRootfs,
InitPath: "/.dockerinit",
WorkingDir: c.Config.WorkingDir,
Network: en,
Pid: pid,
Resources: resources,
CapAdd: c.hostConfig.CapAdd,
CapDrop: c.hostConfig.CapDrop,
ProcessConfig: processConfig,
ProcessLabel: c.GetProcessLabel(),
MountLabel: c.GetMountLabel(),
}
return nil
}
// GetSize, return real size, virtual size
func (container *Container) GetSize() (int64, int64) {
// TODO Windows
return 0, 0
}
func (container *Container) AllocateNetwork() error {
// TODO Windows. This needs reworking with libnetwork. In the
// proof-of-concept for //build conference, the Windows daemon
// invoked eng.Job("allocate_interface) passing through
// RequestedMac.
return nil
}
func (container *Container) ExportRw() (archive.Archive, error) {
if container.IsRunning() {
return nil, fmt.Errorf("Cannot export a running container.")
}
// TODO Windows. Implementation (different to Linux)
return nil, nil
}
func (container *Container) ReleaseNetwork() {
// TODO Windows. Rework with libnetwork
}
func (container *Container) RestoreNetwork() error {
// TODO Windows. Rework with libnetwork
return nil
}
func disableAllActiveLinks(container *Container) {
}
func (container *Container) DisableLink(name string) {
}

39
daemon/daemon.go
View file

@ -155,10 +155,13 @@ func (daemon *Daemon) containerRoot(id string) string {
// This is typically done at startup.
func (daemon *Daemon) load(id string) (*Container, error) {
container := &Container{
root: daemon.containerRoot(id),
State: NewState(),
execCommands: newExecStore(),
CommonContainer: CommonContainer{
State: NewState(),
root: daemon.containerRoot(id),
execCommands: newExecStore(),
},
}
if err := container.FromDisk(); err != nil {
return nil, err
}
@ -573,22 +576,24 @@ func (daemon *Daemon) newContainer(name string, config *runconfig.Config, imgID
entrypoint, args := daemon.getEntrypointAndArgs(config.Entrypoint, config.Cmd)
container := &Container{
// FIXME: we should generate the ID here instead of receiving it as an argument
ID: id,
Created: time.Now().UTC(),
Path: entrypoint,
Args: args, //FIXME: de-duplicate from config
Config: config,
hostConfig: &runconfig.HostConfig{},
ImageID: imgID,
NetworkSettings: &network.Settings{},
Name: name,
Driver: daemon.driver.String(),
ExecDriver: daemon.execDriver.Name(),
State: NewState(),
execCommands: newExecStore(),
CommonContainer: CommonContainer{
ID: id, // FIXME: we should generate the ID here instead of receiving it as an argument
Created: time.Now().UTC(),
Path: entrypoint,
Args: args, //FIXME: de-duplicate from config
Config: config,
hostConfig: &runconfig.HostConfig{},
ImageID: imgID,
NetworkSettings: &network.Settings{},
Name: name,
Driver: daemon.driver.String(),
ExecDriver: daemon.execDriver.Name(),
State: NewState(),
execCommands: newExecStore(),
},
}
container.root = daemon.containerRoot(container.ID)
return container, err
}

34
daemon/daemon_test.go
View file

@ -14,24 +14,38 @@ import (
func TestGet(t *testing.T) {
c1 := &Container{
ID: "5a4ff6a163ad4533d22d69a2b8960bf7fafdcba06e72d2febdba229008b0bf57",
Name: "tender_bardeen",
CommonContainer: CommonContainer{
ID: "5a4ff6a163ad4533d22d69a2b8960bf7fafdcba06e72d2febdba229008b0bf57",
Name: "tender_bardeen",
},
}
c2 := &Container{
ID: "3cdbd1aa394fd68559fd1441d6eff2ab7c1e6363582c82febfaa8045df3bd8de",
Name: "drunk_hawking",
CommonContainer: CommonContainer{
ID: "3cdbd1aa394fd68559fd1441d6eff2ab7c1e6363582c82febfaa8045df3bd8de",
Name: "drunk_hawking",
},
}
c3 := &Container{
ID: "3cdbd1aa394fd68559fd1441d6eff2abfafdcba06e72d2febdba229008b0bf57",
Name: "3cdbd1aa",
CommonContainer: CommonContainer{
ID: "3cdbd1aa394fd68559fd1441d6eff2abfafdcba06e72d2febdba229008b0bf57",
Name: "3cdbd1aa",
},
}
c4 := &Container{
ID: "75fb0b800922abdbef2d27e60abcdfaf7fb0698b2a96d22d3354da361a6ff4a5",
Name: "5a4ff6a163ad4533d22d69a2b8960bf7fafdcba06e72d2febdba229008b0bf57",
CommonContainer: CommonContainer{
ID: "75fb0b800922abdbef2d27e60abcdfaf7fb0698b2a96d22d3354da361a6ff4a5",
Name: "5a4ff6a163ad4533d22d69a2b8960bf7fafdcba06e72d2febdba229008b0bf57",
},
}
c5 := &Container{
ID: "d22d69a2b8960bf7fafdcba06e72d2febdba960bf7fafdcba06e72d2f9008b060b",
Name: "d22d69a2b896",
CommonContainer: CommonContainer{
ID: "d22d69a2b8960bf7fafdcba06e72d2febdba960bf7fafdcba06e72d2f9008b060b",
Name: "d22d69a2b896",
},
}
store := &contStore{

34
daemon/volumes.go
View file

@ -23,18 +23,6 @@ type volumeMount struct {
from string
}
func (container *Container) prepareVolumes() error {
if container.Volumes == nil || len(container.Volumes) == 0 {
container.Volumes = make(map[string]string)
container.VolumesRW = make(map[string]bool)
}
if len(container.hostConfig.VolumesFrom) > 0 && container.AppliedVolumesFrom == nil {
container.AppliedVolumesFrom = make(map[string]struct{})
}
return container.createVolumes()
}
func (container *Container) createVolumes() error {
mounts := make(map[string]*volumeMount)
@ -252,28 +240,6 @@ func (container *Container) specialMounts() []execdriver.Mount {
return mounts
}
func (container *Container) setupMounts() error {
mounts := []execdriver.Mount{}
// Mount user specified volumes
// Note, these are not private because you may want propagation of (un)mounts from host
// volumes. For instance if you use -v /usr:/usr and the host later mounts /usr/share you
// want this new mount in the container
// These mounts must be ordered based on the length of the path that it is being mounted to (lexicographic)
for _, path := range container.sortedVolumeMounts() {
mounts = append(mounts, execdriver.Mount{
Source: container.Volumes[path],
Destination: path,
Writable: container.VolumesRW[path],
})
}
mounts = append(mounts, container.specialMounts()...)
container.command.Mounts = mounts
return nil
}
func (container *Container) volumeMounts() map[string]*volumeMount {
mounts := make(map[string]*volumeMount)

35
daemon/volumes_linux.go
View file

@ -5,6 +5,7 @@ package daemon
import (
"os"
"github.com/docker/docker/daemon/execdriver"
"github.com/docker/docker/pkg/system"
)
@ -22,3 +23,37 @@ func copyOwnership(source, destination string) error {
return os.Chmod(destination, os.FileMode(stat.Mode()))
}
func (container *Container) prepareVolumes() error {
if container.Volumes == nil || len(container.Volumes) == 0 {
container.Volumes = make(map[string]string)
container.VolumesRW = make(map[string]bool)
}
if len(container.hostConfig.VolumesFrom) > 0 && container.AppliedVolumesFrom == nil {
container.AppliedVolumesFrom = make(map[string]struct{})
}
return container.createVolumes()
}
func (container *Container) setupMounts() error {
mounts := []execdriver.Mount{}
// Mount user specified volumes
// Note, these are not private because you may want propagation of (un)mounts from host
// volumes. For instance if you use -v /usr:/usr and the host later mounts /usr/share you
// want this new mount in the container
// These mounts must be ordered based on the length of the path that it is being mounted to (lexicographic)
for _, path := range container.sortedVolumeMounts() {
mounts = append(mounts, execdriver.Mount{
Source: container.Volumes[path],
Destination: path,
Writable: container.VolumesRW[path],
})
}
mounts = append(mounts, container.specialMounts()...)
container.command.Mounts = mounts
return nil
}

8
daemon/volumes_windows.go
View file

@ -6,3 +6,11 @@ package daemon
func copyOwnership(source, destination string) error {
return nil
}
func (container *Container) prepareVolumes() error {
return nil
}
func (container *Container) setupMounts() error {
return nil
}