//go:build linux || freebsd

// +build linux freebsd

package daemon // import "github.com/docker/docker/daemon"

import (

"bufio"

"context"

"fmt"

"net"

"os"

"path/filepath"

"runtime"

"runtime/debug"

"strconv"

"strings"

"sync"

"time"

"github.com/containerd/cgroups"

statsV1 "github.com/containerd/cgroups/stats/v1"

statsV2 "github.com/containerd/cgroups/v2/stats"

"github.com/containerd/containerd/pkg/userns"

"github.com/docker/docker/api/types"

"github.com/docker/docker/api/types/blkiodev"

pblkiodev "github.com/docker/docker/api/types/blkiodev"

containertypes "github.com/docker/docker/api/types/container"

"github.com/docker/docker/container"

"github.com/docker/docker/daemon/config"

"github.com/docker/docker/daemon/initlayer"

"github.com/docker/docker/errdefs"

"github.com/docker/docker/libcontainerd/remote"

"github.com/docker/docker/libnetwork"

nwconfig "github.com/docker/docker/libnetwork/config"

"github.com/docker/docker/libnetwork/drivers/bridge"

"github.com/docker/docker/libnetwork/netlabel"

"github.com/docker/docker/libnetwork/netutils"

"github.com/docker/docker/libnetwork/options"

lntypes "github.com/docker/docker/libnetwork/types"

"github.com/docker/docker/opts"

"github.com/docker/docker/pkg/containerfs"

"github.com/docker/docker/pkg/idtools"

"github.com/docker/docker/pkg/parsers"

"github.com/docker/docker/pkg/parsers/kernel"

"github.com/docker/docker/pkg/sysinfo"

"github.com/docker/docker/runconfig"

volumemounts "github.com/docker/docker/volume/mounts"

"github.com/moby/sys/mount"

specs "github.com/opencontainers/runtime-spec/specs-go"

"github.com/opencontainers/selinux/go-selinux"

"github.com/opencontainers/selinux/go-selinux/label"

"github.com/pkg/errors"

"github.com/sirupsen/logrus"

"github.com/vishvananda/netlink"

"golang.org/x/sys/unix"

)

const (

isWindows = false

// See https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/tree/kernel/sched/sched.h?id=8cd9234c64c584432f6992fe944ca9e46ca8ea76#n269

linuxMinCPUShares = 2

linuxMaxCPUShares = 262144

platformSupported = true

// It's not kernel limit, we want this 6M limit to account for overhead during startup, and to supply a reasonable functional container

linuxMinMemory = 6291456

// constants for remapped root settings

defaultIDSpecifier = "default"

defaultRemappedID = "dockremap"

// constant for cgroup drivers

cgroupFsDriver = "cgroupfs"

cgroupSystemdDriver = "systemd"

cgroupNoneDriver = "none"

)

type containerGetter interface {

GetContainer(string) (*container.Container, error)

}

func getMemoryResources(config containertypes.Resources) *specs.LinuxMemory {

memory := specs.LinuxMemory{}

if config.Memory > 0 {

memory.Limit = &config.Memory

}

if config.MemoryReservation > 0 {

memory.Reservation = &config.MemoryReservation

}

if config.MemorySwap > 0 {

memory.Swap = &config.MemorySwap

}

if config.MemorySwappiness != nil {

swappiness := uint64(*config.MemorySwappiness)

memory.Swappiness = &swappiness

}

if config.OomKillDisable != nil {

memory.DisableOOMKiller = config.OomKillDisable

}

if config.KernelMemory != 0 {

memory.Kernel = &config.KernelMemory

}

if config.KernelMemoryTCP != 0 {

memory.KernelTCP = &config.KernelMemoryTCP

}

return &memory

}

func getPidsLimit(config containertypes.Resources) *specs.LinuxPids {

if config.PidsLimit == nil {

return nil

}

if *config.PidsLimit <= 0 {

// docker API allows 0 and negative values to unset this to be consistent

// with default values. When updating values, runc requires -1 to unset

// the previous limit.

return &specs.LinuxPids{Limit: -1}

}

return &specs.LinuxPids{Limit: *config.PidsLimit}

}

func getCPUResources(config containertypes.Resources) (*specs.LinuxCPU, error) {

cpu := specs.LinuxCPU{}

if config.CPUShares < 0 {

return nil, fmt.Errorf("shares: invalid argument")

}

if config.CPUShares >= 0 {

shares := uint64(config.CPUShares)

cpu.Shares = &shares

}

if config.CpusetCpus != "" {

cpu.Cpus = config.CpusetCpus

}

if config.CpusetMems != "" {

cpu.Mems = config.CpusetMems

}

if config.NanoCPUs > 0 {

// https://www.kernel.org/doc/Documentation/scheduler/sched-bwc.txt

period := uint64(100 * time.Millisecond / time.Microsecond)

quota := config.NanoCPUs * int64(period) / 1e9

cpu.Period = &period

cpu.Quota = &quota

}

if config.CPUPeriod != 0 {

period := uint64(config.CPUPeriod)

cpu.Period = &period

}

if config.CPUQuota != 0 {

q := config.CPUQuota

cpu.Quota = &q

}

if config.CPURealtimePeriod != 0 {

period := uint64(config.CPURealtimePeriod)

cpu.RealtimePeriod = &period

}

if config.CPURealtimeRuntime != 0 {

c := config.CPURealtimeRuntime

cpu.RealtimeRuntime = &c

}

return &cpu, nil

}

func getBlkioWeightDevices(config containertypes.Resources) ([]specs.LinuxWeightDevice, error) {

var stat unix.Stat_t

var blkioWeightDevices []specs.LinuxWeightDevice

for _, weightDevice := range config.BlkioWeightDevice {

if err := unix.Stat(weightDevice.Path, &stat); err != nil {

return nil, errors.WithStack(&os.PathError{Op: "stat", Path: weightDevice.Path, Err: err})

}

weight := weightDevice.Weight

d := specs.LinuxWeightDevice{Weight: &weight}

// The type is 32bit on mips.

d.Major = int64(unix.Major(uint64(stat.Rdev))) //nolint: unconvert

d.Minor = int64(unix.Minor(uint64(stat.Rdev))) //nolint: unconvert

blkioWeightDevices = append(blkioWeightDevices, d)

}

return blkioWeightDevices, nil

}

func (daemon *Daemon) parseSecurityOpt(container *container.Container, hostConfig *containertypes.HostConfig) error {

container.NoNewPrivileges = daemon.configStore.NoNewPrivileges

return parseSecurityOpt(container, hostConfig)

}

func parseSecurityOpt(container *container.Container, config *containertypes.HostConfig) error {

var (

labelOpts []string

err error

)

for _, opt := range config.SecurityOpt {

if opt == "no-new-privileges" {

container.NoNewPrivileges = true

continue

}

if opt == "disable" {

labelOpts = append(labelOpts, "disable")

continue

}

var con []string

if strings.Contains(opt, "=") {

con = strings.SplitN(opt, "=", 2)

} else if strings.Contains(opt, ":") {

con = strings.SplitN(opt, ":", 2)

logrus.Warn("Security options with `:` as a separator are deprecated and will be completely unsupported in 17.04, use `=` instead.")

}

if len(con) != 2 {

return fmt.Errorf("invalid --security-opt 1: %q", opt)

}

switch con[0] {

case "label":

labelOpts = append(labelOpts, con[1])

case "apparmor":

container.AppArmorProfile = con[1]

case "seccomp":

container.SeccompProfile = con[1]

case "no-new-privileges":

noNewPrivileges, err := strconv.ParseBool(con[1])

if err != nil {

return fmt.Errorf("invalid --security-opt 2: %q", opt)

}

container.NoNewPrivileges = noNewPrivileges

default:

return fmt.Errorf("invalid --security-opt 2: %q", opt)

}

}

container.ProcessLabel, container.MountLabel, err = label.InitLabels(labelOpts)

return err

}

func getBlkioThrottleDevices(devs []*blkiodev.ThrottleDevice) ([]specs.LinuxThrottleDevice, error) {

var throttleDevices []specs.LinuxThrottleDevice

var stat unix.Stat_t

for _, d := range devs {

if err := unix.Stat(d.Path, &stat); err != nil {

return nil, errors.WithStack(&os.PathError{Op: "stat", Path: d.Path, Err: err})

}

d := specs.LinuxThrottleDevice{Rate: d.Rate}

// the type is 32bit on mips

d.Major = int64(unix.Major(uint64(stat.Rdev))) //nolint: unconvert

d.Minor = int64(unix.Minor(uint64(stat.Rdev))) //nolint: unconvert

throttleDevices = append(throttleDevices, d)

}

return throttleDevices, nil

}

// adjustParallelLimit takes a number of objects and a proposed limit and

// figures out if it's reasonable (and adjusts it accordingly). This is only

// used for daemon startup, which does a lot of parallel loading of containers

// (and if we exceed RLIMIT_NOFILE then we're in trouble).

func adjustParallelLimit(n int, limit int) int {

// Rule-of-thumb overhead factor (how many files will each goroutine open

// simultaneously). Yes, this is ugly but to be frank this whole thing is

// ugly.

const overhead = 2

// On Linux, we need to ensure that parallelStartupJobs doesn't cause us to

// exceed RLIMIT_NOFILE. If parallelStartupJobs is too large, we reduce it

// and give a warning (since in theory the user should increase their

// ulimits to the largest possible value for dockerd).

var rlim unix.Rlimit

if err := unix.Getrlimit(unix.RLIMIT_NOFILE, &rlim); err != nil {

logrus.Warnf("Couldn't find dockerd's RLIMIT_NOFILE to double-check startup parallelism factor: %v", err)

return limit

}

softRlimit := int(rlim.Cur)

// Much fewer containers than RLIMIT_NOFILE. No need to adjust anything.

if softRlimit > overhead*n {

return limit

}

// RLIMIT_NOFILE big enough, no need to adjust anything.

if softRlimit > overhead*limit {

return limit

}

logrus.Warnf("Found dockerd's open file ulimit (%v) is far too small -- consider increasing it significantly (at least %v)", softRlimit, overhead*limit)

return softRlimit / overhead

}

// adaptContainerSettings is called during container creation to modify any

// settings necessary in the HostConfig structure.

func (daemon *Daemon) adaptContainerSettings(hostConfig *containertypes.HostConfig, adjustCPUShares bool) error {

if adjustCPUShares && hostConfig.CPUShares > 0 {

// Handle unsupported CPUShares

if hostConfig.CPUShares < linuxMinCPUShares {

logrus.Warnf("Changing requested CPUShares of %d to minimum allowed of %d", hostConfig.CPUShares, linuxMinCPUShares)

hostConfig.CPUShares = linuxMinCPUShares

} else if hostConfig.CPUShares > linuxMaxCPUShares {

logrus.Warnf("Changing requested CPUShares of %d to maximum allowed of %d", hostConfig.CPUShares, linuxMaxCPUShares)

hostConfig.CPUShares = linuxMaxCPUShares

}

}

if hostConfig.Memory > 0 && hostConfig.MemorySwap == 0 {

// By default, MemorySwap is set to twice the size of Memory.

hostConfig.MemorySwap = hostConfig.Memory * 2

}

if hostConfig.ShmSize == 0 {

hostConfig.ShmSize = config.DefaultShmSize

if daemon.configStore != nil {

hostConfig.ShmSize = int64(daemon.configStore.ShmSize)

}

}

// Set default IPC mode, if unset for container

if hostConfig.IpcMode.IsEmpty() {

m := config.DefaultIpcMode

if daemon.configStore != nil {

m = containertypes.IpcMode(daemon.configStore.IpcMode)

}

hostConfig.IpcMode = m

}

// Set default cgroup namespace mode, if unset for container

if hostConfig.CgroupnsMode.IsEmpty() {

// for cgroup v2: unshare cgroupns even for privileged containers

// https://github.com/containers/libpod/pull/4374#issuecomment-549776387

if hostConfig.Privileged && cgroups.Mode() != cgroups.Unified {

hostConfig.CgroupnsMode = containertypes.CgroupnsModeHost

} else {

m := containertypes.CgroupnsModeHost

if cgroups.Mode() == cgroups.Unified {

m = containertypes.CgroupnsModePrivate

}

if daemon.configStore != nil {

m = containertypes.CgroupnsMode(daemon.configStore.CgroupNamespaceMode)

}

hostConfig.CgroupnsMode = m

}

}

adaptSharedNamespaceContainer(daemon, hostConfig)

var err error

secOpts, err := daemon.generateSecurityOpt(hostConfig)

if err != nil {

return err

}

hostConfig.SecurityOpt = append(hostConfig.SecurityOpt, secOpts...)

if hostConfig.OomKillDisable == nil {

defaultOomKillDisable := false

hostConfig.OomKillDisable = &defaultOomKillDisable

}

return nil

}

// adaptSharedNamespaceContainer replaces container name with its ID in hostConfig.

// To be more precisely, it modifies `container:name` to `container:ID` of PidMode, IpcMode

// and NetworkMode.

//

// When a container shares its namespace with another container, use ID can keep the namespace

// sharing connection between the two containers even the another container is renamed.

func adaptSharedNamespaceContainer(daemon containerGetter, hostConfig *containertypes.HostConfig) {

containerPrefix := "container:"

if hostConfig.PidMode.IsContainer() {

pidContainer := hostConfig.PidMode.Container()

// if there is any error returned here, we just ignore it and leave it to be

// handled in the following logic

if c, err := daemon.GetContainer(pidContainer); err == nil {

hostConfig.PidMode = containertypes.PidMode(containerPrefix + c.ID)

}

}

if hostConfig.IpcMode.IsContainer() {

ipcContainer := hostConfig.IpcMode.Container()

if c, err := daemon.GetContainer(ipcContainer); err == nil {

hostConfig.IpcMode = containertypes.IpcMode(containerPrefix + c.ID)

}

}

if hostConfig.NetworkMode.IsContainer() {

netContainer := hostConfig.NetworkMode.ConnectedContainer()

if c, err := daemon.GetContainer(netContainer); err == nil {

hostConfig.NetworkMode = containertypes.NetworkMode(containerPrefix + c.ID)

}

}

}

// verifyPlatformContainerResources performs platform-specific validation of the container's resource-configuration

func verifyPlatformContainerResources(resources *containertypes.Resources, sysInfo *sysinfo.SysInfo, update bool) (warnings []string, err error) {

fixMemorySwappiness(resources)

// memory subsystem checks and adjustments

if resources.Memory != 0 && resources.Memory < linuxMinMemory {

return warnings, fmt.Errorf("Minimum memory limit allowed is 6MB")

}

if resources.Memory > 0 && !sysInfo.MemoryLimit {

warnings = append(warnings, "Your kernel does not support memory limit capabilities or the cgroup is not mounted. Limitation discarded.")

resources.Memory = 0

resources.MemorySwap = -1

}

if resources.Memory > 0 && resources.MemorySwap != -1 && !sysInfo.SwapLimit {

warnings = append(warnings, "Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.")

resources.MemorySwap = -1

}

if resources.Memory > 0 && resources.MemorySwap > 0 && resources.MemorySwap < resources.Memory {

return warnings, fmt.Errorf("Minimum memoryswap limit should be larger than memory limit, see usage")

}

if resources.Memory == 0 && resources.MemorySwap > 0 && !update {

return warnings, fmt.Errorf("You should always set the Memory limit when using Memoryswap limit, see usage")

}

if resources.MemorySwappiness != nil && !sysInfo.MemorySwappiness {

warnings = append(warnings, "Your kernel does not support memory swappiness capabilities or the cgroup is not mounted. Memory swappiness discarded.")

resources.MemorySwappiness = nil

}

if resources.MemorySwappiness != nil {

swappiness := *resources.MemorySwappiness

if swappiness < 0 || swappiness > 100 {

return warnings, fmt.Errorf("Invalid value: %v, valid memory swappiness range is 0-100", swappiness)

}

}

if resources.MemoryReservation > 0 && !sysInfo.MemoryReservation {

warnings = append(warnings, "Your kernel does not support memory soft limit capabilities or the cgroup is not mounted. Limitation discarded.")

resources.MemoryReservation = 0

}

if resources.MemoryReservation > 0 && resources.MemoryReservation < linuxMinMemory {

return warnings, fmt.Errorf("Minimum memory reservation allowed is 6MB")

}

if resources.Memory > 0 && resources.MemoryReservation > 0 && resources.Memory < resources.MemoryReservation {

return warnings, fmt.Errorf("Minimum memory limit can not be less than memory reservation limit, see usage")

}

if resources.KernelMemory > 0 {

// Kernel memory limit is not supported on cgroup v2.

// Even on cgroup v1, kernel memory limit (`kmem.limit_in_bytes`) has been deprecated since kernel 5.4.

// https://github.com/torvalds/linux/commit/0158115f702b0ba208ab0b5adf44cae99b3ebcc7

if !sysInfo.KernelMemory {

warnings = append(warnings, "Your kernel does not support kernel memory limit capabilities or the cgroup is not mounted. Limitation discarded.")

resources.KernelMemory = 0

}

if resources.KernelMemory > 0 && resources.KernelMemory < linuxMinMemory {

return warnings, fmt.Errorf("Minimum kernel memory limit allowed is 6MB")

}

if !kernel.CheckKernelVersion(4, 0, 0) {

warnings = append(warnings, "You specified a kernel memory limit on a kernel older than 4.0. Kernel memory limits are experimental on older kernels, it won't work as expected and can cause your system to be unstable.")

}

}

if resources.OomKillDisable != nil && !sysInfo.OomKillDisable {

// only produce warnings if the setting wasn't to *disable* the OOM Kill; no point

// warning the caller if they already wanted the feature to be off

if *resources.OomKillDisable {

warnings = append(warnings, "Your kernel does not support OomKillDisable. OomKillDisable discarded.")

}

resources.OomKillDisable = nil

}

if resources.OomKillDisable != nil && *resources.OomKillDisable && resources.Memory == 0 {

warnings = append(warnings, "OOM killer is disabled for the container, but no memory limit is set, this can result in the system running out of resources.")

}

if resources.PidsLimit != nil && !sysInfo.PidsLimit {

if *resources.PidsLimit > 0 {

warnings = append(warnings, "Your kernel does not support PIDs limit capabilities or the cgroup is not mounted. PIDs limit discarded.")

}

resources.PidsLimit = nil

}

// cpu subsystem checks and adjustments

if resources.NanoCPUs > 0 && resources.CPUPeriod > 0 {

return warnings, fmt.Errorf("Conflicting options: Nano CPUs and CPU Period cannot both be set")

}

if resources.NanoCPUs > 0 && resources.CPUQuota > 0 {

return warnings, fmt.Errorf("Conflicting options: Nano CPUs and CPU Quota cannot both be set")

}

if resources.NanoCPUs > 0 && !sysInfo.CPUCfs {

return warnings, fmt.Errorf("NanoCPUs can not be set, as your kernel does not support CPU CFS scheduler or the cgroup is not mounted")

}

// The highest precision we could get on Linux is 0.001, by setting

// cpu.cfs_period_us=1000ms

// cpu.cfs_quota=1ms

// See the following link for details:

// https://www.kernel.org/doc/Documentation/scheduler/sched-bwc.txt

// Here we don't set the lower limit and it is up to the underlying platform (e.g., Linux) to return an error.

// The error message is 0.01 so that this is consistent with Windows

if resources.NanoCPUs < 0 || resources.NanoCPUs > int64(sysinfo.NumCPU())*1e9 {

return warnings, fmt.Errorf("Range of CPUs is from 0.01 to %d.00, as there are only %d CPUs available", sysinfo.NumCPU(), sysinfo.NumCPU())

}

if resources.CPUShares > 0 && !sysInfo.CPUShares {

warnings = append(warnings, "Your kernel does not support CPU shares or the cgroup is not mounted. Shares discarded.")

resources.CPUShares = 0

}

if (resources.CPUPeriod != 0 || resources.CPUQuota != 0) && !sysInfo.CPUCfs {

warnings = append(warnings, "Your kernel does not support CPU CFS scheduler. CPU period/quota discarded.")

resources.CPUPeriod = 0

resources.CPUQuota = 0

}

if resources.CPUPeriod != 0 && (resources.CPUPeriod < 1000 || resources.CPUPeriod > 1000000) {

return warnings, fmt.Errorf("CPU cfs period can not be less than 1ms (i.e. 1000) or larger than 1s (i.e. 1000000)")

}

if resources.CPUQuota > 0 && resources.CPUQuota < 1000 {

return warnings, fmt.Errorf("CPU cfs quota can not be less than 1ms (i.e. 1000)")

}

if resources.CPUPercent > 0 {

warnings = append(warnings, fmt.Sprintf("%s does not support CPU percent. Percent discarded.", runtime.GOOS))

resources.CPUPercent = 0

}

// cpuset subsystem checks and adjustments

if (resources.CpusetCpus != "" || resources.CpusetMems != "") && !sysInfo.Cpuset {

warnings = append(warnings, "Your kernel does not support cpuset or the cgroup is not mounted. Cpuset discarded.")

resources.CpusetCpus = ""

resources.CpusetMems = ""

}

cpusAvailable, err := sysInfo.IsCpusetCpusAvailable(resources.CpusetCpus)

if err != nil {

return warnings, errors.Wrapf(err, "Invalid value %s for cpuset cpus", resources.CpusetCpus)

}

if !cpusAvailable {

return warnings, fmt.Errorf("Requested CPUs are not available - requested %s, available: %s", resources.CpusetCpus, sysInfo.Cpus)

}

memsAvailable, err := sysInfo.IsCpusetMemsAvailable(resources.CpusetMems)

if err != nil {

return warnings, errors.Wrapf(err, "Invalid value %s for cpuset mems", resources.CpusetMems)

}

if !memsAvailable {

return warnings, fmt.Errorf("Requested memory nodes are not available - requested %s, available: %s", resources.CpusetMems, sysInfo.Mems)

}

// blkio subsystem checks and adjustments

if resources.BlkioWeight > 0 && !sysInfo.BlkioWeight {

warnings = append(warnings, "Your kernel does not support Block I/O weight or the cgroup is not mounted. Weight discarded.")

resources.BlkioWeight = 0

}

if resources.BlkioWeight > 0 && (resources.BlkioWeight < 10 || resources.BlkioWeight > 1000) {

return warnings, fmt.Errorf("Range of blkio weight is from 10 to 1000")

}

if resources.IOMaximumBandwidth != 0 || resources.IOMaximumIOps != 0 {

return warnings, fmt.Errorf("Invalid QoS settings: %s does not support Maximum IO Bandwidth or Maximum IO IOps", runtime.GOOS)

}

if len(resources.BlkioWeightDevice) > 0 && !sysInfo.BlkioWeightDevice {

warnings = append(warnings, "Your kernel does not support Block I/O weight_device or the cgroup is not mounted. Weight-device discarded.")

resources.BlkioWeightDevice = []*pblkiodev.WeightDevice{}

}

if len(resources.BlkioDeviceReadBps) > 0 && !sysInfo.BlkioReadBpsDevice {

warnings = append(warnings, "Your kernel does not support BPS Block I/O read limit or the cgroup is not mounted. Block I/O BPS read limit discarded.")

resources.BlkioDeviceReadBps = []*pblkiodev.ThrottleDevice{}

}

if len(resources.BlkioDeviceWriteBps) > 0 && !sysInfo.BlkioWriteBpsDevice {

warnings = append(warnings, "Your kernel does not support BPS Block I/O write limit or the cgroup is not mounted. Block I/O BPS write limit discarded.")

resources.BlkioDeviceWriteBps = []*pblkiodev.ThrottleDevice{}

}

if len(resources.BlkioDeviceReadIOps) > 0 && !sysInfo.BlkioReadIOpsDevice {

warnings = append(warnings, "Your kernel does not support IOPS Block read limit or the cgroup is not mounted. Block I/O IOPS read limit discarded.")

resources.BlkioDeviceReadIOps = []*pblkiodev.ThrottleDevice{}

}

if len(resources.BlkioDeviceWriteIOps) > 0 && !sysInfo.BlkioWriteIOpsDevice {

warnings = append(warnings, "Your kernel does not support IOPS Block write limit or the cgroup is not mounted. Block I/O IOPS write limit discarded.")

resources.BlkioDeviceWriteIOps = []*pblkiodev.ThrottleDevice{}

}

return warnings, nil

}

func (daemon *Daemon) getCgroupDriver() string {

if UsingSystemd(daemon.configStore) {

return cgroupSystemdDriver

}

if daemon.Rootless() {

return cgroupNoneDriver

}

return cgroupFsDriver

}

// getCD gets the raw value of the native.cgroupdriver option, if set.

func getCD(config *config.Config) string {

for _, option := range config.ExecOptions {

key, val, err := parsers.ParseKeyValueOpt(option)

if err != nil || !strings.EqualFold(key, "native.cgroupdriver") {

continue

}

return val

}

return ""

}

// verifyCgroupDriver validates native.cgroupdriver

func verifyCgroupDriver(config *config.Config) error {

cd := getCD(config)

if cd == "" || cd == cgroupFsDriver || cd == cgroupSystemdDriver {

return nil

}

if cd == cgroupNoneDriver {

return fmt.Errorf("native.cgroupdriver option %s is internally used and cannot be specified manually", cd)

}

return fmt.Errorf("native.cgroupdriver option %s not supported", cd)

}

// UsingSystemd returns true if cli option includes native.cgroupdriver=systemd

func UsingSystemd(config *config.Config) bool {

cd := getCD(config)

if cd == cgroupSystemdDriver {

return true

}

// On cgroup v2 hosts, default to systemd driver

if cd == "" && cgroups.Mode() == cgroups.Unified && isRunningSystemd() {

return true

}

return false

}

var (

runningSystemd bool

detectSystemd sync.Once

)

// isRunningSystemd checks whether the host was booted with systemd as its init

// system. This functions similarly to systemd's `sd_booted(3)`: internally, it

// checks whether /run/systemd/system/ exists and is a directory.

// http://www.freedesktop.org/software/systemd/man/sd_booted.html

//

// NOTE: This function comes from package github.com/coreos/go-systemd/util

// It was borrowed here to avoid a dependency on cgo.

func isRunningSystemd() bool {

detectSystemd.Do(func() {

fi, err := os.Lstat("/run/systemd/system")

if err != nil {

return

}

runningSystemd = fi.IsDir()

})

return runningSystemd

}

// verifyPlatformContainerSettings performs platform-specific validation of the

// hostconfig and config structures.

func verifyPlatformContainerSettings(daemon *Daemon, hostConfig *containertypes.HostConfig, update bool) (warnings []string, err error) {

if hostConfig == nil {

return nil, nil

}

sysInfo := daemon.RawSysInfo()

w, err := verifyPlatformContainerResources(&hostConfig.Resources, sysInfo, update)

// no matter err is nil or not, w could have data in itself.

warnings = append(warnings, w...)

if err != nil {

return warnings, err

}

if !hostConfig.IpcMode.Valid() {

return warnings, errors.Errorf("invalid IPC mode: %v", hostConfig.IpcMode)

}

if !hostConfig.PidMode.Valid() {

return warnings, errors.Errorf("invalid PID mode: %v", hostConfig.PidMode)

}

if hostConfig.ShmSize < 0 {

return warnings, fmt.Errorf("SHM size can not be less than 0")

}

if !hostConfig.UTSMode.Valid() {

return warnings, errors.Errorf("invalid UTS mode: %v", hostConfig.UTSMode)

}

if hostConfig.OomScoreAdj < -1000 || hostConfig.OomScoreAdj > 1000 {

return warnings, fmt.Errorf("Invalid value %d, range for oom score adj is [-1000, 1000]", hostConfig.OomScoreAdj)

}

// ip-forwarding does not affect container with '--net=host' (or '--net=none')

if sysInfo.IPv4ForwardingDisabled && !(hostConfig.NetworkMode.IsHost() || hostConfig.NetworkMode.IsNone()) {

warnings = append(warnings, "IPv4 forwarding is disabled. Networking will not work.")

}

if hostConfig.NetworkMode.IsHost() && len(hostConfig.PortBindings) > 0 {

warnings = append(warnings, "Published ports are discarded when using host network mode")

}

// check for various conflicting options with user namespaces

if daemon.configStore.RemappedRoot != "" && hostConfig.UsernsMode.IsPrivate() {

if hostConfig.Privileged {

return warnings, fmt.Errorf("privileged mode is incompatible with user namespaces. You must run the container in the host namespace when running privileged mode")

}

if hostConfig.NetworkMode.IsHost() && !hostConfig.UsernsMode.IsHost() {

return warnings, fmt.Errorf("cannot share the host's network namespace when user namespaces are enabled")

}

if hostConfig.PidMode.IsHost() && !hostConfig.UsernsMode.IsHost() {

return warnings, fmt.Errorf("cannot share the host PID namespace when user namespaces are enabled")

}

}

if hostConfig.CgroupParent != "" && UsingSystemd(daemon.configStore) {

// CgroupParent for systemd cgroup should be named as "xxx.slice"

if len(hostConfig.CgroupParent) <= 6 || !strings.HasSuffix(hostConfig.CgroupParent, ".slice") {

return warnings, fmt.Errorf("cgroup-parent for systemd cgroup should be a valid slice named as \"xxx.slice\"")

}

}

if hostConfig.Runtime == "" {

hostConfig.Runtime = daemon.configStore.GetDefaultRuntimeName()

}

if rt := daemon.configStore.GetRuntime(hostConfig.Runtime); rt == nil {

return warnings, fmt.Errorf("Unknown runtime specified %s", hostConfig.Runtime)

}

parser := volumemounts.NewParser()

for dest := range hostConfig.Tmpfs {

if err := parser.ValidateTmpfsMountDestination(dest); err != nil {

return warnings, err

}

}

if !hostConfig.CgroupnsMode.Valid() {

return warnings, fmt.Errorf("invalid cgroup namespace mode: %v", hostConfig.CgroupnsMode)

}

if hostConfig.CgroupnsMode.IsPrivate() {

if !sysInfo.CgroupNamespaces {

warnings = append(warnings, "Your kernel does not support cgroup namespaces. Cgroup namespace setting discarded.")

}

}

if hostConfig.Runtime == config.LinuxV1RuntimeName || (hostConfig.Runtime == "" && daemon.configStore.DefaultRuntime == config.LinuxV1RuntimeName) {

warnings = append(warnings, fmt.Sprintf("Configured runtime %q is deprecated and will be removed in the next release.", config.LinuxV1RuntimeName))

}

return warnings, nil

}

// verifyDaemonSettings performs validation of daemon config struct

func verifyDaemonSettings(conf *config.Config) error {

if conf.ContainerdNamespace == conf.ContainerdPluginNamespace {

return errors.New("containers namespace and plugins namespace cannot be the same")

}

// Check for mutually incompatible config options

if conf.BridgeConfig.Iface != "" && conf.BridgeConfig.IP != "" {

return fmt.Errorf("You specified -b & --bip, mutually exclusive options. Please specify only one")

}

if !conf.BridgeConfig.EnableIPTables && !conf.BridgeConfig.InterContainerCommunication {

return fmt.Errorf("You specified --iptables=false with --icc=false. ICC=false uses iptables to function. Please set --icc or --iptables to true")

}

if conf.BridgeConfig.EnableIP6Tables && !conf.Experimental {

return fmt.Errorf("ip6tables rules are only available if experimental features are enabled")

}

if !conf.BridgeConfig.EnableIPTables && conf.BridgeConfig.EnableIPMasq {

conf.BridgeConfig.EnableIPMasq = false

}

if err := verifyCgroupDriver(conf); err != nil {

return err

}

if conf.CgroupParent != "" && UsingSystemd(conf) {

if len(conf.CgroupParent) <= 6 || !strings.HasSuffix(conf.CgroupParent, ".slice") {

return fmt.Errorf("cgroup-parent for systemd cgroup should be a valid slice named as \"xxx.slice\"")

}

}

if conf.Rootless && UsingSystemd(conf) && cgroups.Mode() != cgroups.Unified {

return fmt.Errorf("exec-opt native.cgroupdriver=systemd requires cgroup v2 for rootless mode")

}

configureRuntimes(conf)

if rtName := conf.GetDefaultRuntimeName(); rtName != "" {

if conf.GetRuntime(rtName) == nil {

return fmt.Errorf("specified default runtime '%s' does not exist", rtName)

}

if rtName == config.LinuxV1RuntimeName {

logrus.Warnf("Configured default runtime %q is deprecated and will be removed in the next release.", config.LinuxV1RuntimeName)

}

}

return nil

}

// checkSystem validates platform-specific requirements

func checkSystem() error {

return nil

}

// configureMaxThreads sets the Go runtime max threads threshold

// which is 90% of the kernel setting from /proc/sys/kernel/threads-max

func configureMaxThreads(config *config.Config) error {

mt, err := os.ReadFile("/proc/sys/kernel/threads-max")

if err != nil {

return err

}

mtint, err := strconv.Atoi(strings.TrimSpace(string(mt)))

if err != nil {

return err

}

maxThreads := (mtint / 100) * 90

debug.SetMaxThreads(maxThreads)

logrus.Debugf("Golang's threads limit set to %d", maxThreads)

return nil

}

func overlaySupportsSelinux() (bool, error) {

f, err := os.Open("/proc/kallsyms")

if err != nil {

if os.IsNotExist(err) {

return false, nil

}

return false, err

}

defer f.Close()

s := bufio.NewScanner(f)

for s.Scan() {

if strings.HasSuffix(s.Text(), " security_inode_copy_up") {

return true, nil

}

}

return false, s.Err()

}

// configureKernelSecuritySupport configures and validates security support for the kernel

func configureKernelSecuritySupport(config *config.Config, driverName string) error {

if config.EnableSelinuxSupport {

if !selinux.GetEnabled() {

logrus.Warn("Docker could not enable SELinux on the host system")

return nil

}

if driverName == "overlay" || driverName == "overlay2" {

// If driver is overlay or overlay2, make sure kernel

// supports selinux with overlay.

supported, err := overlaySupportsSelinux()

if err != nil {

return err

}

if !supported {

logrus.Warnf("SELinux is not supported with the %v graph driver on this kernel", driverName)

}

}

} else {

selinux.SetDisabled()

}

return nil

}

// initNetworkController initializes the libnetwork controller and configures

// network settings. If there's active sandboxes, configuration changes will not

// take effect.

func (daemon *Daemon) initNetworkController(activeSandboxes map[string]interface{}) error {

netOptions, err := daemon.networkOptions(daemon.PluginStore, activeSandboxes)

if err != nil {

return err

}

daemon.netController, err = libnetwork.New(netOptions...)

if err != nil {

return fmt.Errorf("error obtaining controller instance: %v", err)

}

if len(activeSandboxes) > 0 {

logrus.Info("there are running containers, updated network configuration will not take affect")

} else if err := configureNetworking(daemon.netController, daemon.configStore); err != nil {

return err

}

// Set HostGatewayIP to the default bridge's IP if it is empty

setHostGatewayIP(daemon.netController, daemon.configStore)

return nil

}

func configureNetworking(controller libnetwork.NetworkController, conf *config.Config) error {

// Initialize default network on "null"

if n, _ := controller.NetworkByName("none"); n == nil {

if _, err := controller.NewNetwork("null", "none", "", libnetwork.NetworkOptionPersist(true)); err != nil {

return errors.Wrap(err, `error creating default "null" network`)

}

}

// Initialize default network on "host"

if n, _ := controller.NetworkByName("host"); n == nil {

if _, err := controller.NewNetwork("host", "host", "", libnetwork.NetworkOptionPersist(true)); err != nil {

return errors.Wrap(err, `error creating default "host" network`)

}

}

// Clear stale bridge network

if n, err := controller.NetworkByName("bridge"); err == nil {

if err = n.Delete(); err != nil {

return errors.Wrap(err, `could not delete the default "bridge"" network`)

}

if len(conf.NetworkConfig.DefaultAddressPools.Value()) > 0 && !conf.LiveRestoreEnabled {

removeDefaultBridgeInterface()

}

}

if !conf.DisableBridge {

// Initialize default driver "bridge"

if err := initBridgeDriver(controller, conf); err != nil {

return err

}

} else {

removeDefaultBridgeInterface()

}

return nil

}

// setHostGatewayIP sets cfg.HostGatewayIP to the default bridge's IP if it is empty.

func setHostGatewayIP(controller libnetwork.NetworkController, config *config.Config) {

if config.HostGatewayIP != nil {

return

}

if n, err := controller.NetworkByName("bridge"); err == nil {

v4Info, v6Info := n.Info().IpamInfo()

var gateway net.IP

if len(v4Info) > 0 {

gateway = v4Info[0].Gateway.IP

} else if len(v6Info) > 0 {

gateway = v6Info[0].Gateway.IP

}

config.HostGatewayIP = gateway

}

}

func driverOptions(config *config.Config) nwconfig.Option {

return nwconfig.OptionDriverConfig("bridge", options.Generic{

netlabel.GenericData: options.Generic{

"EnableIPForwarding": config.BridgeConfig.EnableIPForward,

"EnableIPTables": config.BridgeConfig.EnableIPTables,

"EnableIP6Tables": config.BridgeConfig.EnableIP6Tables,

"EnableUserlandProxy": config.BridgeConfig.EnableUserlandProxy,

"UserlandProxyPath": config.BridgeConfig.UserlandProxyPath,

},

})

}

func initBridgeDriver(controller libnetwork.NetworkController, config *config.Config) error {

bridgeName := bridge.DefaultBridgeName

if config.BridgeConfig.Iface != "" {

bridgeName = config.BridgeConfig.Iface

}

netOption := map[string]string{

bridge.BridgeName: bridgeName,

bridge.DefaultBridge: strconv.FormatBool(true),

netlabel.DriverMTU: strconv.Itoa(config.Mtu),

bridge.EnableIPMasquerade: strconv.FormatBool(config.BridgeConfig.EnableIPMasq),

bridge.EnableICC: strconv.FormatBool(config.BridgeConfig.InterContainerCommunication),

}

// --ip processing

if config.BridgeConfig.DefaultIP != nil {

netOption[bridge.DefaultBindingIP] = config.BridgeConfig.DefaultIP.String()

}

ipamV4Conf := &libnetwork.IpamConf{AuxAddresses: make(map[string]string)}

nwList, nw6List, err := netutils.ElectInterfaceAddresses(bridgeName)

if err != nil {

return errors.Wrap(err, "list bridge addresses failed")

}

nw := nwList[0]

if len(nwList) > 1 && config.BridgeConfig.FixedCIDR != "" {

_, fCIDR, err := net.ParseCIDR(config.BridgeConfig.FixedCIDR)

if err != nil {

return errors.Wrap(err, "parse CIDR failed")

}

// Iterate through in case there are multiple addresses for the bridge

for _, entry := range nwList {

if fCIDR.Contains(entry.IP) {

nw = entry

break

}

}

}

ipamV4Conf.PreferredPool = lntypes.GetIPNetCanonical(nw).String()

hip, _ := lntypes.GetHostPartIP(nw.IP, nw.Mask)

if hip.IsGlobalUnicast() {

ipamV4Conf.Gateway = nw.IP.String()

}

if config.BridgeConfig.IP != "" {

ip, ipNet, err := net.ParseCIDR(config.BridgeConfig.IP)

if err != nil {

return err

}

ipamV4Conf.PreferredPool = ipNet.String()

ipamV4Conf.Gateway = ip.String()

} else if bridgeName == bridge.DefaultBridgeName && ipamV4Conf.PreferredPool != "" {

logrus.Infof("Default bridge (%s) is assigned with an IP address %s. Daemon option --bip can be used to set a preferred IP address", bridgeName, ipamV4Conf.PreferredPool)

}

if config.BridgeConfig.FixedCIDR != "" {

_, fCIDR, err := net.ParseCIDR(config.BridgeConfig.FixedCIDR)

if err != nil {

return err

}