func (daemon *Daemon) populateCommand(c *container.Container, env []string) error {
var en *execdriver.Network
if !c.Config.NetworkDisabled {
en = &execdriver.Network{}
if !daemon.execDriver.SupportsHooks() || c.HostConfig.NetworkMode.IsHost() {
en.NamespacePath = c.NetworkSettings.SandboxKey
}
if c.HostConfig.NetworkMode.IsContainer() {
nc, err := daemon.getNetworkedContainer(c.ID, c.HostConfig.NetworkMode.ConnectedContainer())
if err != nil {
return err
}
en.ContainerID = nc.ID
}
}
ipc := &execdriver.Ipc{}
var err error
c.ShmPath, err = c.ShmResourcePath()
if err != nil {
return err
}
c.MqueuePath, err = c.MqueueResourcePath()
if err != nil {
return err
}
if c.HostConfig.IpcMode.IsContainer() {
ic, err := daemon.getIpcContainer(c)
if err != nil {
return err
}
ipc.ContainerID = ic.ID
c.ShmPath = ic.ShmPath
c.MqueuePath = ic.MqueuePath
} else {
ipc.HostIpc = c.HostConfig.IpcMode.IsHost()
if ipc.HostIpc {
if _, err := os.Stat("/dev/shm"); err != nil {
return fmt.Errorf("/dev/shm is not mounted, but must be for --ipc=host")
}
if _, err := os.Stat("/dev/mqueue"); err != nil {
return fmt.Errorf("/dev/mqueue is not mounted, but must be for --ipc=host")
}
c.ShmPath = "/dev/shm"
c.MqueuePath = "/dev/mqueue"
}
}
pid := &execdriver.Pid{}
pid.HostPid = c.HostConfig.PidMode.IsHost()
uts := &execdriver.UTS{
HostUTS: c.HostConfig.UTSMode.IsHost(),
}
// Build lists of devices allowed and created within the container.
var userSpecifiedDevices []*configs.Device
for _, deviceMapping := range c.HostConfig.Devices {
devs, err := getDevicesFromPath(deviceMapping)
if err != nil {
return err
}
userSpecifiedDevices = append(userSpecifiedDevices, devs...)
}
allowedDevices := mergeDevices(configs.DefaultAllowedDevices, userSpecifiedDevices)
autoCreatedDevices := mergeDevices(configs.DefaultAutoCreatedDevices, userSpecifiedDevices)
var rlimits []*units.Rlimit
ulimits := c.HostConfig.Ulimits
// Merge ulimits with daemon defaults
ulIdx := make(map[string]*units.Ulimit)
for _, ul := range ulimits {
ulIdx[ul.Name] = ul
}
for name, ul := range daemon.configStore.Ulimits {
if _, exists := ulIdx[name]; !exists {
ulimits = append(ulimits, ul)
}
}
weightDevices, err := getBlkioWeightDevices(c.HostConfig)
if err != nil {
return err
}
readBpsDevice, err := getBlkioReadBpsDevices(c.HostConfig)
if err != nil {
return err
}
writeBpsDevice, err := getBlkioWriteBpsDevices(c.HostConfig)
if err != nil {
return err
}
readIOpsDevice, err := getBlkioReadIOpsDevices(c.HostConfig)
if err != nil {
return err
}
writeIOpsDevice, err := getBlkioWriteIOpsDevices(c.HostConfig)
if err != nil {
return err
}
for _, limit := range ulimits {
rl, err := limit.GetRlimit()
if err != nil {
return err
}
rlimits = append(rlimits, rl)
}
resources := &execdriver.Resources{
CommonResources: execdriver.CommonResources{
Memory: c.HostConfig.Memory,
MemoryReservation: c.HostConfig.MemoryReservation,
CPUShares: c.HostConfig.CPUShares,
BlkioWeight: c.HostConfig.BlkioWeight,
},
MemorySwap: c.HostConfig.MemorySwap,
KernelMemory: c.HostConfig.KernelMemory,
CpusetCpus: c.HostConfig.CpusetCpus,
CpusetMems: c.HostConfig.CpusetMems,
CPUPeriod: c.HostConfig.CPUPeriod,
CPUQuota: c.HostConfig.CPUQuota,
Rlimits: rlimits,
BlkioWeightDevice: weightDevices,
BlkioThrottleReadBpsDevice: readBpsDevice,
BlkioThrottleWriteBpsDevice: writeBpsDevice,
BlkioThrottleReadIOpsDevice: readIOpsDevice,
BlkioThrottleWriteIOpsDevice: writeIOpsDevice,
OomKillDisable: c.HostConfig.OomKillDisable,
MemorySwappiness: -1,
}
if c.HostConfig.MemorySwappiness != nil {
resources.MemorySwappiness = *c.HostConfig.MemorySwappiness
}
processConfig := execdriver.ProcessConfig{
CommonProcessConfig: execdriver.CommonProcessConfig{
Entrypoint: c.Path,
Arguments: c.Args,
Tty: c.Config.Tty,
},
Privileged: c.HostConfig.Privileged,
User: c.Config.User,
}
processConfig.SysProcAttr = &syscall.SysProcAttr{Setsid: true}
processConfig.Env = env
remappedRoot := &execdriver.User{}
rootUID, rootGID := daemon.GetRemappedUIDGID()
if rootUID != 0 {
remappedRoot.UID = rootUID
remappedRoot.GID = rootGID
}
uidMap, gidMap := daemon.GetUIDGIDMaps()
defaultCgroupParent := "/docker"
if daemon.configStore.CgroupParent != "" {
defaultCgroupParent = daemon.configStore.CgroupParent
} else {
for _, option := range daemon.configStore.ExecOptions {
key, val, err := parsers.ParseKeyValueOpt(option)
if err != nil || !strings.EqualFold(key, "native.cgroupdriver") {
continue
}
if val == "systemd" {
defaultCgroupParent = "system.slice"
}
}
}
c.Command = &execdriver.Command{
CommonCommand: execdriver.CommonCommand{
ID: c.ID,
InitPath: "/.dockerinit",
MountLabel: c.GetMountLabel(),
Network: en,
ProcessConfig: processConfig,
ProcessLabel: c.GetProcessLabel(),
Rootfs: c.BaseFS,
Resources: resources,
WorkingDir: c.Config.WorkingDir,
},
AllowedDevices: allowedDevices,
AppArmorProfile: c.AppArmorProfile,
AutoCreatedDevices: autoCreatedDevices,
CapAdd: c.HostConfig.CapAdd.Slice(),
CapDrop: c.HostConfig.CapDrop.Slice(),
CgroupParent: defaultCgroupParent,
GIDMapping: gidMap,
GroupAdd: c.HostConfig.GroupAdd,
Ipc: ipc,
OomScoreAdj: c.HostConfig.OomScoreAdj,
Pid: pid,
ReadonlyRootfs: c.HostConfig.ReadonlyRootfs,
RemappedRoot: remappedRoot,
SeccompProfile: c.SeccompProfile,
UIDMapping: uidMap,
UTS: uts,
}
if c.HostConfig.CgroupParent != "" {
c.Command.CgroupParent = c.HostConfig.CgroupParent
}
return nil
}
func (daemon *Daemon) createSpec(c *container.Container) (*libcontainerd.Spec, error) {
s := oci.DefaultSpec()
if err := daemon.populateCommonSpec(&s, c); err != nil {
return nil, err
}
var cgroupsPath string
scopePrefix := "docker"
parent := "/docker"
useSystemd := UsingSystemd(daemon.configStore)
if useSystemd {
parent = "system.slice"
}
if c.HostConfig.CgroupParent != "" {
parent = c.HostConfig.CgroupParent
} else if daemon.configStore.CgroupParent != "" {
parent = daemon.configStore.CgroupParent
}
if useSystemd {
cgroupsPath = parent + ":" + scopePrefix + ":" + c.ID
logrus.Debugf("createSpec: cgroupsPath: %s", cgroupsPath)
} else {
cgroupsPath = filepath.Join(parent, c.ID)
}
s.Linux.CgroupsPath = &cgroupsPath
if err := setResources(&s, c.HostConfig.Resources); err != nil {
return nil, fmt.Errorf("linux runtime spec resources: %v", err)
}
s.Linux.Resources.OOMScoreAdj = &c.HostConfig.OomScoreAdj
s.Linux.Sysctl = c.HostConfig.Sysctls
if err := setDevices(&s, c); err != nil {
return nil, fmt.Errorf("linux runtime spec devices: %v", err)
}
if err := setRlimits(daemon, &s, c); err != nil {
return nil, fmt.Errorf("linux runtime spec rlimits: %v", err)
}
if err := setUser(&s, c); err != nil {
return nil, fmt.Errorf("linux spec user: %v", err)
}
if err := setNamespaces(daemon, &s, c); err != nil {
return nil, fmt.Errorf("linux spec namespaces: %v", err)
}
if err := setCapabilities(&s, c); err != nil {
return nil, fmt.Errorf("linux spec capabilities: %v", err)
}
if err := setSeccomp(daemon, &s, c); err != nil {
return nil, fmt.Errorf("linux seccomp: %v", err)
}
if err := daemon.setupIpcDirs(c); err != nil {
return nil, err
}
ms, err := daemon.setupMounts(c)
if err != nil {
return nil, err
}
ms = append(ms, c.IpcMounts()...)
ms = append(ms, c.TmpfsMounts()...)
sort.Sort(mounts(ms))
if err := setMounts(daemon, &s, c, ms); err != nil {
return nil, fmt.Errorf("linux mounts: %v", err)
}
for _, ns := range s.Linux.Namespaces {
if ns.Type == "network" && ns.Path == "" && !c.Config.NetworkDisabled {
target, err := os.Readlink(filepath.Join("/proc", strconv.Itoa(os.Getpid()), "exe"))
if err != nil {
return nil, err
}
s.Hooks = specs.Hooks{
Prestart: []specs.Hook{{
Path: target, // FIXME: cross-platform
Args: []string{"libnetwork-setkey", c.ID, daemon.netController.ID()},
}},
}
}
}
if apparmor.IsEnabled() {
appArmorProfile := "docker-default"
if len(c.AppArmorProfile) > 0 {
appArmorProfile = c.AppArmorProfile
} else if c.HostConfig.Privileged {
appArmorProfile = "unconfined"
}
s.Process.ApparmorProfile = appArmorProfile
}
s.Process.SelinuxLabel = c.GetProcessLabel()
s.Process.NoNewPrivileges = c.NoNewPrivileges
s.Linux.MountLabel = c.MountLabel
return (*libcontainerd.Spec)(&s), nil
}
func (daemon *Daemon) populateCommand(c *container.Container, env []string) error {
en := &execdriver.Network{
Interface: nil,
}
parts := strings.SplitN(string(c.HostConfig.NetworkMode), ":", 2)
switch parts[0] {
case "none":
case "default", "": // empty string to support existing containers
if !c.Config.NetworkDisabled {
en.Interface = &execdriver.NetworkInterface{
MacAddress: c.Config.MacAddress,
Bridge: daemon.configStore.bridgeConfig.VirtualSwitchName,
PortBindings: c.HostConfig.PortBindings,
// TODO Windows. Include IPAddress. There already is a
// property IPAddress on execDrive.CommonNetworkInterface,
// but there is no CLI option in docker to pass through
// an IPAddress on docker run.
}
}
default:
return derr.ErrorCodeInvalidNetworkMode.WithArgs(c.HostConfig.NetworkMode)
}
// TODO Windows. More resource controls to be implemented later.
resources := &execdriver.Resources{
CommonResources: execdriver.CommonResources{
CPUShares: c.HostConfig.CPUShares,
},
}
processConfig := execdriver.ProcessConfig{
CommonProcessConfig: execdriver.CommonProcessConfig{
Entrypoint: c.Path,
Arguments: c.Args,
Tty: c.Config.Tty,
},
ConsoleSize: c.HostConfig.ConsoleSize,
}
processConfig.Env = env
var layerPaths []string
img, err := daemon.imageStore.Get(c.ImageID)
if err != nil {
return derr.ErrorCodeGetGraph.WithArgs(c.ImageID, err)
}
if img.RootFS != nil && img.RootFS.Type == "layers+base" {
max := len(img.RootFS.DiffIDs)
for i := 0; i <= max; i++ {
img.RootFS.DiffIDs = img.RootFS.DiffIDs[:i]
path, err := layer.GetLayerPath(daemon.layerStore, img.RootFS.ChainID())
if err != nil {
return derr.ErrorCodeGetLayer.WithArgs(err)
}
// Reverse order, expecting parent most first
layerPaths = append([]string{path}, layerPaths...)
}
}
m, err := c.RWLayer.Metadata()
if err != nil {
return derr.ErrorCodeGetLayerMetadata.WithArgs(err)
}
layerFolder := m["dir"]
var hvPartition bool
// Work out the isolation (whether it is a hypervisor partition)
if c.HostConfig.Isolation.IsDefault() {
// Not specified by caller. Take daemon default
hvPartition = windows.DefaultIsolation.IsHyperV()
} else {
// Take value specified by caller
hvPartition = c.HostConfig.Isolation.IsHyperV()
}
c.Command = &execdriver.Command{
CommonCommand: execdriver.CommonCommand{
ID: c.ID,
Rootfs: c.BaseFS,
WorkingDir: c.Config.WorkingDir,
Network: en,
MountLabel: c.GetMountLabel(),
Resources: resources,
ProcessConfig: processConfig,
ProcessLabel: c.GetProcessLabel(),
},
FirstStart: !c.HasBeenStartedBefore,
LayerFolder: layerFolder,
LayerPaths: layerPaths,
Hostname: c.Config.Hostname,
Isolation: string(c.HostConfig.Isolation),
ArgsEscaped: c.Config.ArgsEscaped,
HvPartition: hvPartition,
}
return nil
}
func (daemon *Daemon) populateCommand(c *container.Container, env []string) error {
en := &execdriver.Network{
Interface: nil,
}
var epList []string
// Connect all the libnetwork allocated networks to the container
if c.NetworkSettings != nil {
for n := range c.NetworkSettings.Networks {
sn, err := daemon.FindNetwork(n)
if err != nil {
continue
}
ep, err := c.GetEndpointInNetwork(sn)
if err != nil {
continue
}
data, err := ep.DriverInfo()
if err != nil {
continue
}
if data["hnsid"] != nil {
epList = append(epList, data["hnsid"].(string))
}
}
}
if daemon.netController == nil {
parts := strings.SplitN(string(c.HostConfig.NetworkMode), ":", 2)
switch parts[0] {
case "none":
case "default", "": // empty string to support existing containers
if !c.Config.NetworkDisabled {
en.Interface = &execdriver.NetworkInterface{
MacAddress: c.Config.MacAddress,
Bridge: daemon.configStore.bridgeConfig.Iface,
PortBindings: c.HostConfig.PortBindings,
// TODO Windows. Include IPAddress. There already is a
// property IPAddress on execDrive.CommonNetworkInterface,
// but there is no CLI option in docker to pass through
// an IPAddress on docker run.
}
}
default:
return fmt.Errorf("invalid network mode: %s", c.HostConfig.NetworkMode)
}
}
// TODO Windows. More resource controls to be implemented later.
resources := &execdriver.Resources{
CommonResources: execdriver.CommonResources{
CPUShares: c.HostConfig.CPUShares,
},
}
processConfig := execdriver.ProcessConfig{
CommonProcessConfig: execdriver.CommonProcessConfig{
Entrypoint: c.Path,
Arguments: c.Args,
Tty: c.Config.Tty,
},
ConsoleSize: c.HostConfig.ConsoleSize,
}
processConfig.Env = env
var layerPaths []string
img, err := daemon.imageStore.Get(c.ImageID)
if err != nil {
return fmt.Errorf("Failed to graph.Get on ImageID %s - %s", c.ImageID, err)
}
if img.RootFS != nil && img.RootFS.Type == "layers+base" {
max := len(img.RootFS.DiffIDs)
for i := 0; i <= max; i++ {
img.RootFS.DiffIDs = img.RootFS.DiffIDs[:i]
path, err := layer.GetLayerPath(daemon.layerStore, img.RootFS.ChainID())
if err != nil {
return fmt.Errorf("Failed to get layer path from graphdriver %s for ImageID %s - %s", daemon.layerStore, img.RootFS.ChainID(), err)
}
// Reverse order, expecting parent most first
layerPaths = append([]string{path}, layerPaths...)
}
}
m, err := c.RWLayer.Metadata()
if err != nil {
return fmt.Errorf("Failed to get layer metadata - %s", err)
}
layerFolder := m["dir"]
var hvPartition bool
// Work out the isolation (whether it is a hypervisor partition)
if c.HostConfig.Isolation.IsDefault() {
// Not specified by caller. Take daemon default
hvPartition = windows.DefaultIsolation.IsHyperV()
} else {
// Take value specified by caller
hvPartition = c.HostConfig.Isolation.IsHyperV()
}
c.Command = &execdriver.Command{
CommonCommand: execdriver.CommonCommand{
ID: c.ID,
Rootfs: c.BaseFS,
WorkingDir: c.Config.WorkingDir,
Network: en,
MountLabel: c.GetMountLabel(),
Resources: resources,
ProcessConfig: processConfig,
ProcessLabel: c.GetProcessLabel(),
},
FirstStart: !c.HasBeenStartedBefore,
LayerFolder: layerFolder,
LayerPaths: layerPaths,
Hostname: c.Config.Hostname,
Isolation: string(c.HostConfig.Isolation),
ArgsEscaped: c.Config.ArgsEscaped,
HvPartition: hvPartition,
EpList: epList,
}
return nil
}
func (daemon *Daemon) createSpec(c *container.Container) (*specs.Spec, error) {
s := oci.DefaultSpec()
if err := daemon.populateCommonSpec(&s, c); err != nil {
return nil, err
}
var cgroupsPath string
scopePrefix := "docker"
parent := "/docker"
useSystemd := UsingSystemd(daemon.configStore)
if useSystemd {
parent = "system.slice"
}
if c.HostConfig.CgroupParent != "" {
parent = c.HostConfig.CgroupParent
} else if daemon.configStore.CgroupParent != "" {
parent = daemon.configStore.CgroupParent
}
if useSystemd {
cgroupsPath = parent + ":" + scopePrefix + ":" + c.ID
logrus.Debugf("createSpec: cgroupsPath: %s", cgroupsPath)
} else {
cgroupsPath = filepath.Join(parent, c.ID)
}
s.Linux.CgroupsPath = &cgroupsPath
if err := setResources(&s, c.HostConfig.Resources); err != nil {
return nil, fmt.Errorf("linux runtime spec resources: %v", err)
}
s.Linux.Resources.OOMScoreAdj = &c.HostConfig.OomScoreAdj
s.Linux.Sysctl = c.HostConfig.Sysctls
p := *s.Linux.CgroupsPath
if useSystemd {
initPath, err := cgroups.GetInitCgroupDir("cpu")
if err != nil {
return nil, err
}
p, _ = cgroups.GetThisCgroupDir("cpu")
if err != nil {
return nil, err
}
p = filepath.Join(initPath, p)
}
// Clean path to guard against things like ../../../BAD
parentPath := filepath.Dir(p)
if !filepath.IsAbs(parentPath) {
parentPath = filepath.Clean("/" + parentPath)
}
if err := daemon.initCgroupsPath(parentPath); err != nil {
return nil, fmt.Errorf("linux init cgroups path: %v", err)
}
if err := setDevices(&s, c); err != nil {
return nil, fmt.Errorf("linux runtime spec devices: %v", err)
}
if err := setRlimits(daemon, &s, c); err != nil {
return nil, fmt.Errorf("linux runtime spec rlimits: %v", err)
}
if err := setUser(&s, c); err != nil {
return nil, fmt.Errorf("linux spec user: %v", err)
}
if err := setNamespaces(daemon, &s, c); err != nil {
return nil, fmt.Errorf("linux spec namespaces: %v", err)
}
if err := setCapabilities(&s, c); err != nil {
return nil, fmt.Errorf("linux spec capabilities: %v", err)
}
if err := setSeccomp(daemon, &s, c); err != nil {
return nil, fmt.Errorf("linux seccomp: %v", err)
}
if err := daemon.setupIpcDirs(c); err != nil {
return nil, err
}
if err := daemon.setupSecretDir(c); err != nil {
return nil, err
}
ms, err := daemon.setupMounts(c)
if err != nil {
return nil, err
}
ms = append(ms, c.IpcMounts()...)
tmpfsMounts, err := c.TmpfsMounts()
if err != nil {
return nil, err
}
ms = append(ms, tmpfsMounts...)
if m := c.SecretMount(); m != nil {
ms = append(ms, *m)
}
sort.Sort(mounts(ms))
if err := setMounts(daemon, &s, c, ms); err != nil {
return nil, fmt.Errorf("linux mounts: %v", err)
}
for _, ns := range s.Linux.Namespaces {
if ns.Type == "network" && ns.Path == "" && !c.Config.NetworkDisabled {
target, err := os.Readlink(filepath.Join("/proc", strconv.Itoa(os.Getpid()), "exe"))
if err != nil {
return nil, err
}
s.Hooks = specs.Hooks{
Prestart: []specs.Hook{{
Path: target, // FIXME: cross-platform
Args: []string{"libnetwork-setkey", c.ID, daemon.netController.ID()},
}},
}
}
}
if apparmor.IsEnabled() {
var appArmorProfile string
if c.AppArmorProfile != "" {
appArmorProfile = c.AppArmorProfile
} else if c.HostConfig.Privileged {
appArmorProfile = "unconfined"
} else {
appArmorProfile = "docker-default"
}
if appArmorProfile == "docker-default" {
// Unattended upgrades and other fun services can unload AppArmor
// profiles inadvertently. Since we cannot store our profile in
// /etc/apparmor.d, nor can we practically add other ways of
// telling the system to keep our profile loaded, in order to make
// sure that we keep the default profile enabled we dynamically
// reload it if necessary.
if err := ensureDefaultAppArmorProfile(); err != nil {
return nil, err
}
}
s.Process.ApparmorProfile = appArmorProfile
}
s.Process.SelinuxLabel = c.GetProcessLabel()
s.Process.NoNewPrivileges = c.NoNewPrivileges
s.Linux.MountLabel = c.MountLabel
return (*specs.Spec)(&s), nil
}
//创建容器的namespace以及cgroups等相关。
func (daemon *Daemon) createSpec(c *container.Container) (*libcontainerd.Spec, error) {
s := oci.DefaultSpec()
//populateCommand(container, env) 主要是为container的execdriver(最终启动容器的)
//设置网络模式、设置namespace(pid,ipc,uts)等、资源(resources)限制等，并且设置
//在容器内执行的Command，Command中含有容器内进程的启动命令；
if err := daemon.populateCommonSpec(&s, c); err != nil {
return nil, err
}
var cgroupsPath string
scopePrefix := "docker"
parent := "/docker"
useSystemd := UsingSystemd(daemon.configStore)
if useSystemd {
parent = "system.slice"
}
if c.HostConfig.CgroupParent != "" {
parent = c.HostConfig.CgroupParent
} else if daemon.configStore.CgroupParent != "" {
parent = daemon.configStore.CgroupParent
}
//是否支持systemd？
if useSystemd {
cgroupsPath = parent + ":" + scopePrefix + ":" + c.ID
logrus.Debugf("createSpec: cgroupsPath: %s", cgroupsPath)
} else {
cgroupsPath = filepath.Join(parent, c.ID)
}
s.Linux.CgroupsPath = &cgroupsPath
//设置一系列的参数
if err := setResources(&s, c.HostConfig.Resources); err != nil {
return nil, fmt.Errorf("linux runtime spec resources: %v", err)
}
s.Linux.Resources.OOMScoreAdj = &c.HostConfig.OomScoreAdj
if err := setDevices(&s, c); err != nil {
return nil, fmt.Errorf("linux runtime spec devices: %v", err)
}
if err := setRlimits(daemon, &s, c); err != nil {
return nil, fmt.Errorf("linux runtime spec rlimits: %v", err)
}
if err := setUser(&s, c); err != nil {
return nil, fmt.Errorf("linux spec user: %v", err)
}
//设置namespace
if err := setNamespaces(daemon, &s, c); err != nil {
return nil, fmt.Errorf("linux spec namespaces: %v", err)
}
//设置cgroup。
if err := setCapabilities(&s, c); err != nil {
return nil, fmt.Errorf("linux spec capabilities: %v", err)
}
//?
if err := setSeccomp(daemon, &s, c); err != nil {
return nil, fmt.Errorf("linux seccomp: %v", err)
}
//?
if err := daemon.setupIpcDirs(c); err != nil {
return nil, err
}
//container.setupMounts() 返回container的所有挂载点；
mounts, err := daemon.setupMounts(c)
if err != nil {
return nil, err
}
mounts = append(mounts, c.IpcMounts()...)
mounts = append(mounts, c.TmpfsMounts()...)
//设置容器的所有挂载点。
if err := setMounts(daemon, &s, c, mounts); err != nil {
return nil, fmt.Errorf("linux mounts: %v", err)
}
//和网络的设置有关，但是这一点究竟是干什么的呢？
//设置到进程的钩子，通过进程/proc/XXX/exe的链接文件获取到。
for _, ns := range s.Linux.Namespaces {
if ns.Type == "network" && ns.Path == "" && !c.Config.NetworkDisabled {
target, err := os.Readlink(filepath.Join("/proc", strconv.Itoa(os.Getpid()), "exe"))
if err != nil {
return nil, err
}
s.Hooks = specs.Hooks{
//// Hooks are the commands run at various lifecycle events of the container.
Prestart: []specs.Hook{{
Path: target, // FIXME: cross-platform
Args: []string{"libnetwork-setkey", c.ID, daemon.netController.ID()},
}},
}
}
}
//apparmor相关配置
if apparmor.IsEnabled() {
appArmorProfile := "docker-default"
if len(c.AppArmorProfile) > 0 {
appArmorProfile = c.AppArmorProfile
} else if c.HostConfig.Privileged {
appArmorProfile = "unconfined"
}
s.Process.ApparmorProfile = appArmorProfile
}
//设置容器的selinux,privilege,moutlabel等特性。
s.Process.SelinuxLabel = c.GetProcessLabel()
s.Process.NoNewPrivileges = c.NoNewPrivileges
s.Linux.MountLabel = c.MountLabel
return (*libcontainerd.Spec)(&s), nil
}