| // +build linux freebsd |
| |
| package daemon |
| |
| import ( |
| "bytes" |
| "fmt" |
| "io/ioutil" |
| "net" |
| "os" |
| "path/filepath" |
| "runtime" |
| "runtime/debug" |
| "strconv" |
| "strings" |
| "syscall" |
| "time" |
| |
| "github.com/Sirupsen/logrus" |
| "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/image" |
| "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" |
| runconfigopts "github.com/docker/docker/runconfig/opts" |
| "github.com/docker/libnetwork" |
| nwconfig "github.com/docker/libnetwork/config" |
| "github.com/docker/libnetwork/drivers/bridge" |
| "github.com/docker/libnetwork/netlabel" |
| "github.com/docker/libnetwork/netutils" |
| "github.com/docker/libnetwork/options" |
| lntypes "github.com/docker/libnetwork/types" |
| "github.com/golang/protobuf/ptypes" |
| "github.com/opencontainers/runc/libcontainer/cgroups" |
| "github.com/opencontainers/runc/libcontainer/label" |
| rsystem "github.com/opencontainers/runc/libcontainer/system" |
| specs "github.com/opencontainers/runtime-spec/specs-go" |
| "github.com/pkg/errors" |
| "github.com/vishvananda/netlink" |
| ) |
| |
| const ( |
| // See https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/tree/kernel/sched/sched.h?id=8cd9234c64c584432f6992fe944ca9e46ca8ea76#n269 |
| linuxMinCPUShares = 2 |
| linuxMaxCPUShares = 262144 |
| platformSupported = true |
| // It's not kernel limit, we want this 4M limit to supply a reasonable functional container |
| linuxMinMemory = 4194304 |
| // constants for remapped root settings |
| defaultIDSpecifier string = "default" |
| defaultRemappedID string = "dockremap" |
| |
| // constant for cgroup drivers |
| cgroupFsDriver = "cgroupfs" |
| cgroupSystemdDriver = "systemd" |
| ) |
| |
| func getMemoryResources(config containertypes.Resources) *specs.Memory { |
| memory := specs.Memory{} |
| |
| if config.Memory > 0 { |
| limit := uint64(config.Memory) |
| memory.Limit = &limit |
| } |
| |
| if config.MemoryReservation > 0 { |
| reservation := uint64(config.MemoryReservation) |
| memory.Reservation = &reservation |
| } |
| |
| if config.MemorySwap != 0 { |
| swap := uint64(config.MemorySwap) |
| memory.Swap = &swap |
| } |
| |
| if config.MemorySwappiness != nil { |
| swappiness := uint64(*config.MemorySwappiness) |
| memory.Swappiness = &swappiness |
| } |
| |
| if config.KernelMemory != 0 { |
| kernelMemory := uint64(config.KernelMemory) |
| memory.Kernel = &kernelMemory |
| } |
| |
| return &memory |
| } |
| |
| func getCPUResources(config containertypes.Resources) *specs.CPU { |
| cpu := specs.CPU{} |
| |
| if config.CPUShares != 0 { |
| shares := uint64(config.CPUShares) |
| cpu.Shares = &shares |
| } |
| |
| if config.CpusetCpus != "" { |
| cpuset := config.CpusetCpus |
| cpu.Cpus = &cpuset |
| } |
| |
| if config.CpusetMems != "" { |
| cpuset := config.CpusetMems |
| cpu.Mems = &cpuset |
| } |
| |
| if config.NanoCPUs > 0 { |
| // https://www.kernel.org/doc/Documentation/scheduler/sched-bwc.txt |
| period := uint64(100 * time.Millisecond / time.Microsecond) |
| quota := uint64(config.NanoCPUs) * period / 1e9 |
| cpu.Period = &period |
| cpu.Quota = "a |
| } |
| |
| if config.CPUPeriod != 0 { |
| period := uint64(config.CPUPeriod) |
| cpu.Period = &period |
| } |
| |
| if config.CPUQuota != 0 { |
| quota := uint64(config.CPUQuota) |
| cpu.Quota = "a |
| } |
| |
| if config.CPURealtimePeriod != 0 { |
| period := uint64(config.CPURealtimePeriod) |
| cpu.RealtimePeriod = &period |
| } |
| |
| if config.CPURealtimeRuntime != 0 { |
| runtime := uint64(config.CPURealtimeRuntime) |
| cpu.RealtimeRuntime = &runtime |
| } |
| |
| return &cpu |
| } |
| |
| func getBlkioWeightDevices(config containertypes.Resources) ([]specs.WeightDevice, error) { |
| var stat syscall.Stat_t |
| var blkioWeightDevices []specs.WeightDevice |
| |
| for _, weightDevice := range config.BlkioWeightDevice { |
| if err := syscall.Stat(weightDevice.Path, &stat); err != nil { |
| return nil, err |
| } |
| weight := weightDevice.Weight |
| d := specs.WeightDevice{Weight: &weight} |
| d.Major = int64(stat.Rdev / 256) |
| d.Minor = int64(stat.Rdev % 256) |
| blkioWeightDevices = append(blkioWeightDevices, d) |
| } |
| |
| return blkioWeightDevices, nil |
| } |
| |
| 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 |
| } |
| |
| 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 1.14, 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] |
| 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.ThrottleDevice, error) { |
| var throttleDevices []specs.ThrottleDevice |
| var stat syscall.Stat_t |
| |
| for _, d := range devs { |
| if err := syscall.Stat(d.Path, &stat); err != nil { |
| return nil, err |
| } |
| rate := d.Rate |
| d := specs.ThrottleDevice{Rate: &rate} |
| d.Major = int64(stat.Rdev / 256) |
| d.Minor = int64(stat.Rdev % 256) |
| throttleDevices = append(throttleDevices, d) |
| } |
| |
| return throttleDevices, nil |
| } |
| |
| func checkKernel() error { |
| // Check for unsupported kernel versions |
| // FIXME: it would be cleaner to not test for specific versions, but rather |
| // test for specific functionalities. |
| // Unfortunately we can't test for the feature "does not cause a kernel panic" |
| // without actually causing a kernel panic, so we need this workaround until |
| // the circumstances of pre-3.10 crashes are clearer. |
| // For details see https://github.com/docker/docker/issues/407 |
| // Docker 1.11 and above doesn't actually run on kernels older than 3.4, |
| // due to containerd-shim usage of PR_SET_CHILD_SUBREAPER (introduced in 3.4). |
| if !kernel.CheckKernelVersion(3, 10, 0) { |
| v, _ := kernel.GetKernelVersion() |
| if os.Getenv("DOCKER_NOWARN_KERNEL_VERSION") == "" { |
| logrus.Fatalf("Your Linux kernel version %s is not supported for running docker. Please upgrade your kernel to 3.10.0 or newer.", v.String()) |
| } |
| } |
| return nil |
| } |
| |
| // 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 = container.DefaultSHMSize |
| } |
| var err error |
| opts, err := daemon.generateSecurityOpt(hostConfig.IpcMode, hostConfig.PidMode, hostConfig.Privileged) |
| if err != nil { |
| return err |
| } |
| hostConfig.SecurityOpt = append(hostConfig.SecurityOpt, opts...) |
| if hostConfig.MemorySwappiness == nil { |
| defaultSwappiness := int64(-1) |
| hostConfig.MemorySwappiness = &defaultSwappiness |
| } |
| if hostConfig.OomKillDisable == nil { |
| defaultOomKillDisable := false |
| hostConfig.OomKillDisable = &defaultOomKillDisable |
| } |
| |
| return nil |
| } |
| |
| func verifyContainerResources(resources *containertypes.Resources, sysInfo *sysinfo.SysInfo, update bool) ([]string, error) { |
| warnings := []string{} |
| |
| // memory subsystem checks and adjustments |
| if resources.Memory != 0 && resources.Memory < linuxMinMemory { |
| return warnings, fmt.Errorf("Minimum memory limit allowed is 4MB") |
| } |
| 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.") |
| logrus.Warn("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.") |
| logrus.Warn("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 && *resources.MemorySwappiness != -1 && !sysInfo.MemorySwappiness { |
| warnings = append(warnings, "Your kernel does not support memory swappiness capabilities or the cgroup is not mounted. Memory swappiness discarded.") |
| logrus.Warn("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 < -1 || 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.") |
| logrus.Warn("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 4MB") |
| } |
| 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 && !sysInfo.KernelMemory { |
| warnings = append(warnings, "Your kernel does not support kernel memory limit capabilities or the cgroup is not mounted. Limitation discarded.") |
| logrus.Warn("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 4MB") |
| } |
| if resources.KernelMemory > 0 && !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.") |
| logrus.Warn("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.") |
| logrus.Warn("Your kernel does not support OomKillDisable. OomKillDisable discarded.") |
| } |
| resources.OomKillDisable = nil |
| } |
| |
| if resources.PidsLimit != 0 && !sysInfo.PidsLimit { |
| warnings = append(warnings, "Your kernel does not support pids limit capabilities or the cgroup is not mounted. PIDs limit discarded.") |
| logrus.Warn("Your kernel does not support pids limit capabilities or the cgroup is not mounted. PIDs limit discarded.") |
| resources.PidsLimit = 0 |
| } |
| |
| // 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.CPUCfsPeriod || !sysInfo.CPUCfsQuota) { |
| return warnings, fmt.Errorf("NanoCPUs can not be set, as your kernel does not support CPU cfs period/quota 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.") |
| logrus.Warn("Your kernel does not support CPU shares or the cgroup is not mounted. Shares discarded.") |
| resources.CPUShares = 0 |
| } |
| if resources.CPUPeriod > 0 && !sysInfo.CPUCfsPeriod { |
| warnings = append(warnings, "Your kernel does not support CPU cfs period or the cgroup is not mounted. Period discarded.") |
| logrus.Warn("Your kernel does not support CPU cfs period or the cgroup is not mounted. Period discarded.") |
| resources.CPUPeriod = 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 && !sysInfo.CPUCfsQuota { |
| warnings = append(warnings, "Your kernel does not support CPU cfs quota or the cgroup is not mounted. Quota discarded.") |
| logrus.Warn("Your kernel does not support CPU cfs quota or the cgroup is not mounted. Quota discarded.") |
| resources.CPUQuota = 0 |
| } |
| 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)) |
| logrus.Warnf("%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.") |
| logrus.Warn("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, fmt.Errorf("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, fmt.Errorf("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.") |
| logrus.Warn("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.") |
| logrus.Warn("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.") |
| logrus.Warn("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.") |
| logrus.Warn("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.") |
| logrus.Warn("Your kernel does not support IOPS Block I/O read limit in IO 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.") |
| logrus.Warn("Your kernel does not support IOPS Block I/O 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 { |
| cgroupDriver := cgroupFsDriver |
| |
| if UsingSystemd(daemon.configStore) { |
| cgroupDriver = cgroupSystemdDriver |
| } |
| return cgroupDriver |
| } |
| |
| // getCD gets the raw value of the native.cgroupdriver option, if set. |
| func getCD(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) error { |
| cd := getCD(config) |
| if cd == "" || cd == cgroupFsDriver || cd == cgroupSystemdDriver { |
| return nil |
| } |
| return fmt.Errorf("native.cgroupdriver option %s not supported", cd) |
| } |
| |
| // UsingSystemd returns true if cli option includes native.cgroupdriver=systemd |
| func UsingSystemd(config *Config) bool { |
| return getCD(config) == cgroupSystemdDriver |
| } |
| |
| // verifyPlatformContainerSettings performs platform-specific validation of the |
| // hostconfig and config structures. |
| func verifyPlatformContainerSettings(daemon *Daemon, hostConfig *containertypes.HostConfig, config *containertypes.Config, update bool) ([]string, error) { |
| warnings := []string{} |
| sysInfo := sysinfo.New(true) |
| |
| warnings, err := daemon.verifyExperimentalContainerSettings(hostConfig, config) |
| if err != nil { |
| return warnings, err |
| } |
| |
| w, err := verifyContainerResources(&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.ShmSize < 0 { |
| return warnings, fmt.Errorf("SHM size can not be less than 0") |
| } |
| |
| 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.") |
| logrus.Warn("IPv4 forwarding is disabled. Networking will not work") |
| } |
| // 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") |
| } |
| 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) |
| } |
| |
| return warnings, nil |
| } |
| |
| // platformReload update configuration with platform specific options |
| func (daemon *Daemon) platformReload(config *Config) map[string]string { |
| if config.IsValueSet("runtimes") { |
| daemon.configStore.Runtimes = config.Runtimes |
| // Always set the default one |
| daemon.configStore.Runtimes[stockRuntimeName] = types.Runtime{Path: DefaultRuntimeBinary} |
| } |
| |
| if config.DefaultRuntime != "" { |
| daemon.configStore.DefaultRuntime = config.DefaultRuntime |
| } |
| |
| // Update attributes |
| var runtimeList bytes.Buffer |
| for name, rt := range daemon.configStore.Runtimes { |
| if runtimeList.Len() > 0 { |
| runtimeList.WriteRune(' ') |
| } |
| runtimeList.WriteString(fmt.Sprintf("%s:%s", name, rt)) |
| } |
| |
| return map[string]string{ |
| "runtimes": runtimeList.String(), |
| "default-runtime": daemon.configStore.DefaultRuntime, |
| } |
| } |
| |
| // verifyDaemonSettings performs validation of daemon config struct |
| func verifyDaemonSettings(config *Config) error { |
| // Check for mutually incompatible config options |
| if config.bridgeConfig.Iface != "" && config.bridgeConfig.IP != "" { |
| return fmt.Errorf("You specified -b & --bip, mutually exclusive options. Please specify only one") |
| } |
| if !config.bridgeConfig.EnableIPTables && !config.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 !config.bridgeConfig.EnableIPTables && config.bridgeConfig.EnableIPMasq { |
| config.bridgeConfig.EnableIPMasq = false |
| } |
| if err := VerifyCgroupDriver(config); err != nil { |
| return err |
| } |
| if config.CgroupParent != "" && UsingSystemd(config) { |
| if len(config.CgroupParent) <= 6 || !strings.HasSuffix(config.CgroupParent, ".slice") { |
| return fmt.Errorf("cgroup-parent for systemd cgroup should be a valid slice named as \"xxx.slice\"") |
| } |
| } |
| |
| if config.DefaultRuntime == "" { |
| config.DefaultRuntime = stockRuntimeName |
| } |
| if config.Runtimes == nil { |
| config.Runtimes = make(map[string]types.Runtime) |
| } |
| config.Runtimes[stockRuntimeName] = types.Runtime{Path: DefaultRuntimeBinary} |
| |
| return nil |
| } |
| |
| // checkSystem validates platform-specific requirements |
| func checkSystem() error { |
| if os.Geteuid() != 0 { |
| return fmt.Errorf("The Docker daemon needs to be run as root") |
| } |
| return checkKernel() |
| } |
| |
| // 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) error { |
| mt, err := ioutil.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 |
| } |
| |
| // configureKernelSecuritySupport configures and validates security support for the kernel |
| func configureKernelSecuritySupport(config *Config, driverName string) error { |
| if config.EnableSelinuxSupport { |
| if !selinuxEnabled() { |
| logrus.Warn("Docker could not enable SELinux on the host system") |
| } |
| } else { |
| selinuxSetDisabled() |
| } |
| return nil |
| } |
| |
| func (daemon *Daemon) initNetworkController(config *Config, activeSandboxes map[string]interface{}) (libnetwork.NetworkController, error) { |
| netOptions, err := daemon.networkOptions(config, daemon.PluginStore, activeSandboxes) |
| if err != nil { |
| return nil, err |
| } |
| |
| controller, err := libnetwork.New(netOptions...) |
| if err != nil { |
| return nil, fmt.Errorf("error obtaining controller instance: %v", err) |
| } |
| |
| if len(activeSandboxes) > 0 { |
| logrus.Info("There are old running containers, the network config will not take affect") |
| return controller, nil |
| } |
| |
| // Initialize default network on "null" |
| if n, _ := controller.NetworkByName("none"); n == nil { |
| if _, err := controller.NewNetwork("null", "none", "", libnetwork.NetworkOptionPersist(true)); err != nil { |
| return nil, fmt.Errorf("Error creating default \"null\" network: %v", err) |
| } |
| } |
| |
| // Initialize default network on "host" |
| if n, _ := controller.NetworkByName("host"); n == nil { |
| if _, err := controller.NewNetwork("host", "host", "", libnetwork.NetworkOptionPersist(true)); err != nil { |
| return nil, fmt.Errorf("Error creating default \"host\" network: %v", err) |
| } |
| } |
| |
| // Clear stale bridge network |
| if n, err := controller.NetworkByName("bridge"); err == nil { |
| if err = n.Delete(); err != nil { |
| return nil, fmt.Errorf("could not delete the default bridge network: %v", err) |
| } |
| } |
| |
| if !config.DisableBridge { |
| // Initialize default driver "bridge" |
| if err := initBridgeDriver(controller, config); err != nil { |
| return nil, err |
| } |
| } else { |
| removeDefaultBridgeInterface() |
| } |
| |
| return controller, nil |
| } |
| |
| func driverOptions(config *Config) []nwconfig.Option { |
| bridgeConfig := options.Generic{ |
| "EnableIPForwarding": config.bridgeConfig.EnableIPForward, |
| "EnableIPTables": config.bridgeConfig.EnableIPTables, |
| "EnableUserlandProxy": config.bridgeConfig.EnableUserlandProxy, |
| "UserlandProxyPath": config.bridgeConfig.UserlandProxyPath} |
| bridgeOption := options.Generic{netlabel.GenericData: bridgeConfig} |
| |
| dOptions := []nwconfig.Option{} |
| dOptions = append(dOptions, nwconfig.OptionDriverConfig("bridge", bridgeOption)) |
| return dOptions |
| } |
| |
| func initBridgeDriver(controller libnetwork.NetworkController, config *Config) error { |
| 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() |
| } |
| |
| var ( |
| ipamV4Conf *libnetwork.IpamConf |
| ipamV6Conf *libnetwork.IpamConf |
| ) |
| |
| 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 != "" { |
| ipamV4Conf.PreferredPool = config.bridgeConfig.IP |
| ip, _, err := net.ParseCIDR(config.bridgeConfig.IP) |
| if err != nil { |
| return err |
| } |
| 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 |
| } |
| |
| ipamV4Conf.SubPool = fCIDR.String() |
| } |
| |
| if config.bridgeConfig.DefaultGatewayIPv4 != nil { |
| ipamV4Conf.AuxAddresses["DefaultGatewayIPv4"] = config.bridgeConfig.DefaultGatewayIPv4.String() |
| } |
| |
| var deferIPv6Alloc bool |
| if config.bridgeConfig.FixedCIDRv6 != "" { |
| _, fCIDRv6, err := net.ParseCIDR(config.bridgeConfig.FixedCIDRv6) |
| if err != nil { |
| return err |
| } |
| |
| // In case user has specified the daemon flag --fixed-cidr-v6 and the passed network has |
| // at least 48 host bits, we need to guarantee the current behavior where the containers' |
| // IPv6 addresses will be constructed based on the containers' interface MAC address. |
| // We do so by telling libnetwork to defer the IPv6 address allocation for the endpoints |
| // on this network until after the driver has created the endpoint and returned the |
| // constructed address. Libnetwork will then reserve this address with the ipam driver. |
| ones, _ := fCIDRv6.Mask.Size() |
| deferIPv6Alloc = ones <= 80 |
| |
| if ipamV6Conf == nil { |
| ipamV6Conf = &libnetwork.IpamConf{AuxAddresses: make(map[string]string)} |
| } |
| ipamV6Conf.PreferredPool = fCIDRv6.String() |
| |
| // In case the --fixed-cidr-v6 is specified and the current docker0 bridge IPv6 |
| // address belongs to the same network, we need to inform libnetwork about it, so |
| // that it can be reserved with IPAM and it will not be given away to somebody else |
| for _, nw6 := range nw6List { |
| if fCIDRv6.Contains(nw6.IP) { |
| ipamV6Conf.Gateway = nw6.IP.String() |
| break |
| } |
| } |
| } |
| |
| if config.bridgeConfig.DefaultGatewayIPv6 != nil { |
| if ipamV6Conf == nil { |
| ipamV6Conf = &libnetwork.IpamConf{AuxAddresses: make(map[string]string)} |
| } |
| ipamV6Conf.AuxAddresses["DefaultGatewayIPv6"] = config.bridgeConfig.DefaultGatewayIPv6.String() |
| } |
| |
| v4Conf := []*libnetwork.IpamConf{ipamV4Conf} |
| v6Conf := []*libnetwork.IpamConf{} |
| if ipamV6Conf != nil { |
| v6Conf = append(v6Conf, ipamV6Conf) |
| } |
| // Initialize default network on "bridge" with the same name |
| _, err = controller.NewNetwork("bridge", "bridge", "", |
| libnetwork.NetworkOptionEnableIPv6(config.bridgeConfig.EnableIPv6), |
| libnetwork.NetworkOptionDriverOpts(netOption), |
| libnetwork.NetworkOptionIpam("default", "", v4Conf, v6Conf, nil), |
| libnetwork.NetworkOptionDeferIPv6Alloc(deferIPv6Alloc)) |
| if err != nil { |
| return fmt.Errorf("Error creating default \"bridge\" network: %v", err) |
| } |
| return nil |
| } |
| |
| // Remove default bridge interface if present (--bridge=none use case) |
| func removeDefaultBridgeInterface() { |
| if lnk, err := netlink.LinkByName(bridge.DefaultBridgeName); err == nil { |
| if err := netlink.LinkDel(lnk); err != nil { |
| logrus.Warnf("Failed to remove bridge interface (%s): %v", bridge.DefaultBridgeName, err) |
| } |
| } |
| } |
| |
| func (daemon *Daemon) getLayerInit() func(string) error { |
| return daemon.setupInitLayer |
| } |
| |
| // Parse the remapped root (user namespace) option, which can be one of: |
| // username - valid username from /etc/passwd |
| // username:groupname - valid username; valid groupname from /etc/group |
| // uid - 32-bit unsigned int valid Linux UID value |
| // uid:gid - uid value; 32-bit unsigned int Linux GID value |
| // |
| // If no groupname is specified, and a username is specified, an attempt |
| // will be made to lookup a gid for that username as a groupname |
| // |
| // If names are used, they are verified to exist in passwd/group |
| func parseRemappedRoot(usergrp string) (string, string, error) { |
| |
| var ( |
| userID, groupID int |
| username, groupname string |
| ) |
| |
| idparts := strings.Split(usergrp, ":") |
| if len(idparts) > 2 { |
| return "", "", fmt.Errorf("Invalid user/group specification in --userns-remap: %q", usergrp) |
| } |
| |
| if uid, err := strconv.ParseInt(idparts[0], 10, 32); err == nil { |
| // must be a uid; take it as valid |
| userID = int(uid) |
| luser, err := idtools.LookupUID(userID) |
| if err != nil { |
| return "", "", fmt.Errorf("Uid %d has no entry in /etc/passwd: %v", userID, err) |
| } |
| username = luser.Name |
| if len(idparts) == 1 { |
| // if the uid was numeric and no gid was specified, take the uid as the gid |
| groupID = userID |
| lgrp, err := idtools.LookupGID(groupID) |
| if err != nil { |
| return "", "", fmt.Errorf("Gid %d has no entry in /etc/group: %v", groupID, err) |
| } |
| groupname = lgrp.Name |
| } |
| } else { |
| lookupName := idparts[0] |
| // special case: if the user specified "default", they want Docker to create or |
| // use (after creation) the "dockremap" user/group for root remapping |
| if lookupName == defaultIDSpecifier { |
| lookupName = defaultRemappedID |
| } |
| luser, err := idtools.LookupUser(lookupName) |
| if err != nil && idparts[0] != defaultIDSpecifier { |
| // error if the name requested isn't the special "dockremap" ID |
| return "", "", fmt.Errorf("Error during uid lookup for %q: %v", lookupName, err) |
| } else if err != nil { |
| // special case-- if the username == "default", then we have been asked |
| // to create a new entry pair in /etc/{passwd,group} for which the /etc/sub{uid,gid} |
| // ranges will be used for the user and group mappings in user namespaced containers |
| _, _, err := idtools.AddNamespaceRangesUser(defaultRemappedID) |
| if err == nil { |
| return defaultRemappedID, defaultRemappedID, nil |
| } |
| return "", "", fmt.Errorf("Error during %q user creation: %v", defaultRemappedID, err) |
| } |
| username = luser.Name |
| if len(idparts) == 1 { |
| // we only have a string username, and no group specified; look up gid from username as group |
| group, err := idtools.LookupGroup(lookupName) |
| if err != nil { |
| return "", "", fmt.Errorf("Error during gid lookup for %q: %v", lookupName, err) |
| } |
| groupID = group.Gid |
| groupname = group.Name |
| } |
| } |
| |
| if len(idparts) == 2 { |
| // groupname or gid is separately specified and must be resolved |
| // to an unsigned 32-bit gid |
| if gid, err := strconv.ParseInt(idparts[1], 10, 32); err == nil { |
| // must be a gid, take it as valid |
| groupID = int(gid) |
| lgrp, err := idtools.LookupGID(groupID) |
| if err != nil { |
| return "", "", fmt.Errorf("Gid %d has no entry in /etc/passwd: %v", groupID, err) |
| } |
| groupname = lgrp.Name |
| } else { |
| // not a number; attempt a lookup |
| if _, err := idtools.LookupGroup(idparts[1]); err != nil { |
| return "", "", fmt.Errorf("Error during groupname lookup for %q: %v", idparts[1], err) |
| } |
| groupname = idparts[1] |
| } |
| } |
| return username, groupname, nil |
| } |
| |
| func setupRemappedRoot(config *Config) ([]idtools.IDMap, []idtools.IDMap, error) { |
| if runtime.GOOS != "linux" && config.RemappedRoot != "" { |
| return nil, nil, fmt.Errorf("User namespaces are only supported on Linux") |
| } |
| |
| // if the daemon was started with remapped root option, parse |
| // the config option to the int uid,gid values |
| var ( |
| uidMaps, gidMaps []idtools.IDMap |
| ) |
| if config.RemappedRoot != "" { |
| username, groupname, err := parseRemappedRoot(config.RemappedRoot) |
| if err != nil { |
| return nil, nil, err |
| } |
| if username == "root" { |
| // Cannot setup user namespaces with a 1-to-1 mapping; "--root=0:0" is a no-op |
| // effectively |
| logrus.Warn("User namespaces: root cannot be remapped with itself; user namespaces are OFF") |
| return uidMaps, gidMaps, nil |
| } |
| logrus.Infof("User namespaces: ID ranges will be mapped to subuid/subgid ranges of: %s:%s", username, groupname) |
| // update remapped root setting now that we have resolved them to actual names |
| config.RemappedRoot = fmt.Sprintf("%s:%s", username, groupname) |
| |
| uidMaps, gidMaps, err = idtools.CreateIDMappings(username, groupname) |
| if err != nil { |
| return nil, nil, fmt.Errorf("Can't create ID mappings: %v", err) |
| } |
| } |
| return uidMaps, gidMaps, nil |
| } |
| |
| func setupDaemonRoot(config *Config, rootDir string, rootUID, rootGID int) error { |
| config.Root = rootDir |
| // the docker root metadata directory needs to have execute permissions for all users (g+x,o+x) |
| // so that syscalls executing as non-root, operating on subdirectories of the graph root |
| // (e.g. mounted layers of a container) can traverse this path. |
| // The user namespace support will create subdirectories for the remapped root host uid:gid |
| // pair owned by that same uid:gid pair for proper write access to those needed metadata and |
| // layer content subtrees. |
| if _, err := os.Stat(rootDir); err == nil { |
| // root current exists; verify the access bits are correct by setting them |
| if err = os.Chmod(rootDir, 0711); err != nil { |
| return err |
| } |
| } else if os.IsNotExist(err) { |
| // no root exists yet, create it 0711 with root:root ownership |
| if err := os.MkdirAll(rootDir, 0711); err != nil { |
| return err |
| } |
| } |
| |
| // if user namespaces are enabled we will create a subtree underneath the specified root |
| // with any/all specified remapped root uid/gid options on the daemon creating |
| // a new subdirectory with ownership set to the remapped uid/gid (so as to allow |
| // `chdir()` to work for containers namespaced to that uid/gid) |
| if config.RemappedRoot != "" { |
| config.Root = filepath.Join(rootDir, fmt.Sprintf("%d.%d", rootUID, rootGID)) |
| logrus.Debugf("Creating user namespaced daemon root: %s", config.Root) |
| // Create the root directory if it doesn't exist |
| if err := idtools.MkdirAllAs(config.Root, 0700, rootUID, rootGID); err != nil { |
| return fmt.Errorf("Cannot create daemon root: %s: %v", config.Root, err) |
| } |
| // we also need to verify that any pre-existing directories in the path to |
| // the graphroot won't block access to remapped root--if any pre-existing directory |
| // has strict permissions that don't allow "x", container start will fail, so |
| // better to warn and fail now |
| dirPath := config.Root |
| for { |
| dirPath = filepath.Dir(dirPath) |
| if dirPath == "/" { |
| break |
| } |
| if !idtools.CanAccess(dirPath, rootUID, rootGID) { |
| return fmt.Errorf("A subdirectory in your graphroot path (%s) restricts access to the remapped root uid/gid; please fix by allowing 'o+x' permissions on existing directories.", config.Root) |
| } |
| } |
| } |
| return nil |
| } |
| |
| // registerLinks writes the links to a file. |
| func (daemon *Daemon) registerLinks(container *container.Container, hostConfig *containertypes.HostConfig) error { |
| if hostConfig == nil || hostConfig.NetworkMode.IsUserDefined() { |
| return nil |
| } |
| |
| for _, l := range hostConfig.Links { |
| name, alias, err := runconfigopts.ParseLink(l) |
| if err != nil { |
| return err |
| } |
| child, err := daemon.GetContainer(name) |
| if err != nil { |
| return fmt.Errorf("Could not get container for %s", name) |
| } |
| for child.HostConfig.NetworkMode.IsContainer() { |
| parts := strings.SplitN(string(child.HostConfig.NetworkMode), ":", 2) |
| child, err = daemon.GetContainer(parts[1]) |
| if err != nil { |
| return fmt.Errorf("Could not get container for %s", parts[1]) |
| } |
| } |
| if child.HostConfig.NetworkMode.IsHost() { |
| return runconfig.ErrConflictHostNetworkAndLinks |
| } |
| if err := daemon.registerLink(container, child, alias); err != nil { |
| return err |
| } |
| } |
| |
| // After we load all the links into the daemon |
| // set them to nil on the hostconfig |
| return container.WriteHostConfig() |
| } |
| |
| // conditionalMountOnStart is a platform specific helper function during the |
| // container start to call mount. |
| func (daemon *Daemon) conditionalMountOnStart(container *container.Container) error { |
| return daemon.Mount(container) |
| } |
| |
| // conditionalUnmountOnCleanup is a platform specific helper function called |
| // during the cleanup of a container to unmount. |
| func (daemon *Daemon) conditionalUnmountOnCleanup(container *container.Container) error { |
| return daemon.Unmount(container) |
| } |
| |
| func (daemon *Daemon) stats(c *container.Container) (*types.StatsJSON, error) { |
| if !c.IsRunning() { |
| return nil, errNotRunning{c.ID} |
| } |
| stats, err := daemon.containerd.Stats(c.ID) |
| if err != nil { |
| return nil, err |
| } |
| s := &types.StatsJSON{} |
| cgs := stats.CgroupStats |
| if cgs != nil { |
| s.BlkioStats = types.BlkioStats{ |
| IoServiceBytesRecursive: copyBlkioEntry(cgs.BlkioStats.IoServiceBytesRecursive), |
| IoServicedRecursive: copyBlkioEntry(cgs.BlkioStats.IoServicedRecursive), |
| IoQueuedRecursive: copyBlkioEntry(cgs.BlkioStats.IoQueuedRecursive), |
| IoServiceTimeRecursive: copyBlkioEntry(cgs.BlkioStats.IoServiceTimeRecursive), |
| IoWaitTimeRecursive: copyBlkioEntry(cgs.BlkioStats.IoWaitTimeRecursive), |
| IoMergedRecursive: copyBlkioEntry(cgs.BlkioStats.IoMergedRecursive), |
| IoTimeRecursive: copyBlkioEntry(cgs.BlkioStats.IoTimeRecursive), |
| SectorsRecursive: copyBlkioEntry(cgs.BlkioStats.SectorsRecursive), |
| } |
| cpu := cgs.CpuStats |
| s.CPUStats = types.CPUStats{ |
| CPUUsage: types.CPUUsage{ |
| TotalUsage: cpu.CpuUsage.TotalUsage, |
| PercpuUsage: cpu.CpuUsage.PercpuUsage, |
| UsageInKernelmode: cpu.CpuUsage.UsageInKernelmode, |
| UsageInUsermode: cpu.CpuUsage.UsageInUsermode, |
| }, |
| ThrottlingData: types.ThrottlingData{ |
| Periods: cpu.ThrottlingData.Periods, |
| ThrottledPeriods: cpu.ThrottlingData.ThrottledPeriods, |
| ThrottledTime: cpu.ThrottlingData.ThrottledTime, |
| }, |
| } |
| mem := cgs.MemoryStats.Usage |
| s.MemoryStats = types.MemoryStats{ |
| Usage: mem.Usage, |
| MaxUsage: mem.MaxUsage, |
| Stats: cgs.MemoryStats.Stats, |
| Failcnt: mem.Failcnt, |
| Limit: mem.Limit, |
| } |
| // if the container does not set memory limit, use the machineMemory |
| if mem.Limit > daemon.statsCollector.machineMemory && daemon.statsCollector.machineMemory > 0 { |
| s.MemoryStats.Limit = daemon.statsCollector.machineMemory |
| } |
| if cgs.PidsStats != nil { |
| s.PidsStats = types.PidsStats{ |
| Current: cgs.PidsStats.Current, |
| } |
| } |
| } |
| s.Read, err = ptypes.Timestamp(stats.Timestamp) |
| if err != nil { |
| return nil, err |
| } |
| return s, nil |
| } |
| |
| // setDefaultIsolation determines the default isolation mode for the |
| // daemon to run in. This is only applicable on Windows |
| func (daemon *Daemon) setDefaultIsolation() error { |
| return nil |
| } |
| |
| func rootFSToAPIType(rootfs *image.RootFS) types.RootFS { |
| var layers []string |
| for _, l := range rootfs.DiffIDs { |
| layers = append(layers, l.String()) |
| } |
| return types.RootFS{ |
| Type: rootfs.Type, |
| Layers: layers, |
| } |
| } |
| |
| // setupDaemonProcess sets various settings for the daemon's process |
| func setupDaemonProcess(config *Config) error { |
| // setup the daemons oom_score_adj |
| return setupOOMScoreAdj(config.OOMScoreAdjust) |
| } |
| |
| func setupOOMScoreAdj(score int) error { |
| f, err := os.OpenFile("/proc/self/oom_score_adj", os.O_WRONLY, 0) |
| if err != nil { |
| return err |
| } |
| |
| stringScore := strconv.Itoa(score) |
| _, err = f.WriteString(stringScore) |
| if os.IsPermission(err) { |
| // Setting oom_score_adj does not work in an |
| // unprivileged container. Ignore the error, but log |
| // it if we appear not to be in that situation. |
| if !rsystem.RunningInUserNS() { |
| logrus.Debugf("Permission denied writing %q to /proc/self/oom_score_adj", stringScore) |
| } |
| return nil |
| } |
| f.Close() |
| return err |
| } |
| |
| func (daemon *Daemon) initCgroupsPath(path string) error { |
| if path == "/" || path == "." { |
| return nil |
| } |
| |
| daemon.initCgroupsPath(filepath.Dir(path)) |
| |
| _, root, err := cgroups.FindCgroupMountpointAndRoot("cpu") |
| if err != nil { |
| return err |
| } |
| |
| path = filepath.Join(root, path) |
| sysinfo := sysinfo.New(false) |
| if err := os.MkdirAll(path, 0755); err != nil && !os.IsExist(err) { |
| return err |
| } |
| if sysinfo.CPURealtimePeriod && daemon.configStore.CPURealtimePeriod != 0 { |
| if err := ioutil.WriteFile(filepath.Join(path, "cpu.rt_period_us"), []byte(strconv.FormatInt(daemon.configStore.CPURealtimePeriod, 10)), 0700); err != nil { |
| return err |
| } |
| } |
| if sysinfo.CPURealtimeRuntime && daemon.configStore.CPURealtimeRuntime != 0 { |
| if err := ioutil.WriteFile(filepath.Join(path, "cpu.rt_runtime_us"), []byte(strconv.FormatInt(daemon.configStore.CPURealtimeRuntime, 10)), 0700); err != nil { |
| return err |
| } |
| } |
| return nil |
| } |
| |
| func (daemon *Daemon) setupSeccompProfile() error { |
| if daemon.configStore.SeccompProfile != "" { |
| daemon.seccompProfilePath = daemon.configStore.SeccompProfile |
| b, err := ioutil.ReadFile(daemon.configStore.SeccompProfile) |
| if err != nil { |
| return fmt.Errorf("opening seccomp profile (%s) failed: %v", daemon.configStore.SeccompProfile, err) |
| } |
| daemon.seccompProfile = b |
| } |
| return nil |
| } |