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package main
import (
"fmt"
"os"
"strings"
"github.com/docker/docker/pkg/sysinfo"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
const (
// It's not kernel limit, we want this 4M limit to supply a reasonable functional container
linuxMinMemory = 4194304
)
func getAllLabels(labelFile, inputLabels []string) (map[string]string, error) {
labels := make(map[string]string)
labelErr := readKVStrings(labels, labelFile, inputLabels)
if labelErr != nil {
return labels, errors.Wrapf(labelErr, "unable to process labels from --label and label-file")
}
return labels, nil
}
func convertStringSliceToMap(strSlice []string, delimiter string) (map[string]string, error) {
sysctl := make(map[string]string)
for _, inputSysctl := range strSlice {
values := strings.Split(inputSysctl, delimiter)
if len(values) < 2 {
return sysctl, errors.Errorf("%s in an invalid sysctl value", inputSysctl)
}
sysctl[values[0]] = values[1]
}
return sysctl, nil
}
func addWarning(warnings []string, msg string) []string {
logrus.Warn(msg)
return append(warnings, msg)
}
func parseVolumes(volumes []string) error {
if len(volumes) == 0 {
return nil
}
for _, volume := range volumes {
arr := strings.SplitN(volume, ":", 3)
if len(arr) < 2 {
return errors.Errorf("incorrect volume format %q, should be host-dir:ctr-dir:[option]", volume)
}
if err := validateVolumeHostDir(arr[0]); err != nil {
return err
}
if err := validateVolumeCtrDir(arr[1]); err != nil {
return err
}
if len(arr) > 2 {
if err := validateVolumeOpts(arr[2]); err != nil {
return err
}
}
}
return nil
}
func validateVolumeHostDir(hostDir string) error {
if _, err := os.Stat(hostDir); err != nil {
return errors.Wrapf(err, "error checking path %q", hostDir)
}
return nil
}
func validateVolumeCtrDir(ctrDir string) error {
if ctrDir[0] != '/' {
return errors.Errorf("invalid container directory path %q", ctrDir)
}
return nil
}
func validateVolumeOpts(option string) error {
var foundRootPropagation, foundRWRO, foundLabelChange int
options := strings.Split(option, ",")
for _, opt := range options {
switch opt {
case "rw", "ro":
if foundRWRO > 1 {
return errors.Errorf("invalid options %q, can only specify 1 'rw' or 'ro' option", option)
}
foundRWRO++
case "z", "Z":
if foundLabelChange > 1 {
return errors.Errorf("invalid options %q, can only specify 1 'z' or 'Z' option", option)
}
foundLabelChange++
case "private", "rprivate", "shared", "rshared", "slave", "rslave":
if foundRootPropagation > 1 {
return errors.Errorf("invalid options %q, can only specify 1 '[r]shared', '[r]private' or '[r]slave' option", option)
}
foundRootPropagation++
default:
return errors.Errorf("invalid option type %q", option)
}
}
return nil
}
func verifyContainerResources(config *createConfig, update bool) ([]string, error) {
warnings := []string{}
sysInfo := sysinfo.New(true)
// memory subsystem checks and adjustments
if config.Resources.Memory != 0 && config.Resources.Memory < linuxMinMemory {
return warnings, fmt.Errorf("minimum memory limit allowed is 4MB")
}
if config.Resources.Memory > 0 && !sysInfo.MemoryLimit {
warnings = addWarning(warnings, "Your kernel does not support memory limit capabilities or the cgroup is not mounted. Limitation discarded.")
config.Resources.Memory = 0
config.Resources.MemorySwap = -1
}
if config.Resources.Memory > 0 && config.Resources.MemorySwap != -1 && !sysInfo.SwapLimit {
warnings = addWarning(warnings, "Your kernel does not support swap limit capabilities,or the cgroup is not mounted. Memory limited without swap.")
config.Resources.MemorySwap = -1
}
if config.Resources.Memory > 0 && config.Resources.MemorySwap > 0 && config.Resources.MemorySwap < config.Resources.Memory {
return warnings, fmt.Errorf("minimum memoryswap limit should be larger than memory limit, see usage")
}
if config.Resources.Memory == 0 && config.Resources.MemorySwap > 0 && !update {
return warnings, fmt.Errorf("you should always set the memory limit when using memoryswap limit, see usage")
}
if config.Resources.MemorySwappiness != -1 {
if !sysInfo.MemorySwappiness {
msg := "Your kernel does not support memory swappiness capabilities, or the cgroup is not mounted. Memory swappiness discarded."
warnings = addWarning(warnings, msg)
config.Resources.MemorySwappiness = -1
} else {
swappiness := config.Resources.MemorySwappiness
if swappiness < -1 || swappiness > 100 {
return warnings, fmt.Errorf("invalid value: %v, valid memory swappiness range is 0-100", swappiness)
}
}
}
if config.Resources.MemoryReservation > 0 && !sysInfo.MemoryReservation {
warnings = addWarning(warnings, "Your kernel does not support memory soft limit capabilities or the cgroup is not mounted. Limitation discarded.")
config.Resources.MemoryReservation = 0
}
if config.Resources.MemoryReservation > 0 && config.Resources.MemoryReservation < linuxMinMemory {
return warnings, fmt.Errorf("minimum memory reservation allowed is 4MB")
}
if config.Resources.Memory > 0 && config.Resources.MemoryReservation > 0 && config.Resources.Memory < config.Resources.MemoryReservation {
return warnings, fmt.Errorf("minimum memory limit can not be less than memory reservation limit, see usage")
}
if config.Resources.KernelMemory > 0 && !sysInfo.KernelMemory {
warnings = addWarning(warnings, "Your kernel does not support kernel memory limit capabilities or the cgroup is not mounted. Limitation discarded.")
config.Resources.KernelMemory = 0
}
if config.Resources.KernelMemory > 0 && config.Resources.KernelMemory < linuxMinMemory {
return warnings, fmt.Errorf("minimum kernel memory limit allowed is 4MB")
}
if config.Resources.DisableOomKiller == true && !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
warnings = addWarning(warnings, "Your kernel does not support OomKillDisable. OomKillDisable discarded.")
config.Resources.DisableOomKiller = false
}
if config.Resources.PidsLimit != 0 && !sysInfo.PidsLimit {
warnings = addWarning(warnings, "Your kernel does not support pids limit capabilities or the cgroup is not mounted. PIDs limit discarded.")
config.Resources.PidsLimit = 0
}
if config.Resources.CpuShares > 0 && !sysInfo.CPUShares {
warnings = addWarning(warnings, "Your kernel does not support CPU shares or the cgroup is not mounted. Shares discarded.")
config.Resources.CpuShares = 0
}
if config.Resources.CpuPeriod > 0 && !sysInfo.CPUCfsPeriod {
warnings = addWarning(warnings, "Your kernel does not support CPU cfs period or the cgroup is not mounted. Period discarded.")
config.Resources.CpuPeriod = 0
}
if config.Resources.CpuPeriod != 0 && (config.Resources.CpuPeriod < 1000 || config.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 config.Resources.CpuQuota > 0 && !sysInfo.CPUCfsQuota {
warnings = addWarning(warnings, "Your kernel does not support CPU cfs quota or the cgroup is not mounted. Quota discarded.")
config.Resources.CpuQuota = 0
}
if config.Resources.CpuQuota > 0 && config.Resources.CpuQuota < 1000 {
return warnings, fmt.Errorf("CPU cfs quota can not be less than 1ms (i.e. 1000)")
}
// cpuset subsystem checks and adjustments
if (config.Resources.CpusetCpus != "" || config.Resources.CpusetMems != "") && !sysInfo.Cpuset {
warnings = addWarning(warnings, "Your kernel does not support cpuset or the cgroup is not mounted. Cpuset discarded.")
config.Resources.CpusetCpus = ""
config.Resources.CpusetMems = ""
}
cpusAvailable, err := sysInfo.IsCpusetCpusAvailable(config.Resources.CpusetCpus)
if err != nil {
return warnings, fmt.Errorf("invalid value %s for cpuset cpus", config.Resources.CpusetCpus)
}
if !cpusAvailable {
return warnings, fmt.Errorf("requested CPUs are not available - requested %s, available: %s", config.Resources.CpusetCpus, sysInfo.Cpus)
}
memsAvailable, err := sysInfo.IsCpusetMemsAvailable(config.Resources.CpusetMems)
if err != nil {
return warnings, fmt.Errorf("invalid value %s for cpuset mems", config.Resources.CpusetMems)
}
if !memsAvailable {
return warnings, fmt.Errorf("requested memory nodes are not available - requested %s, available: %s", config.Resources.CpusetMems, sysInfo.Mems)
}
// blkio subsystem checks and adjustments
if config.Resources.BlkioWeight > 0 && !sysInfo.BlkioWeight {
warnings = addWarning(warnings, "Your kernel does not support Block I/O weight or the cgroup is not mounted. Weight discarded.")
config.Resources.BlkioWeight = 0
}
if config.Resources.BlkioWeight > 0 && (config.Resources.BlkioWeight < 10 || config.Resources.BlkioWeight > 1000) {
return warnings, fmt.Errorf("range of blkio weight is from 10 to 1000")
}
if len(config.Resources.BlkioWeightDevice) > 0 && !sysInfo.BlkioWeightDevice {
warnings = addWarning(warnings, "Your kernel does not support Block I/O weight_device or the cgroup is not mounted. Weight-device discarded.")
config.Resources.BlkioWeightDevice = []string{}
}
if len(config.Resources.DeviceReadBps) > 0 && !sysInfo.BlkioReadBpsDevice {
warnings = addWarning(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")
config.Resources.DeviceReadBps = []string{}
}
if len(config.Resources.DeviceWriteBps) > 0 && !sysInfo.BlkioWriteBpsDevice {
warnings = addWarning(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.")
config.Resources.DeviceWriteBps = []string{}
}
if len(config.Resources.DeviceReadIOps) > 0 && !sysInfo.BlkioReadIOpsDevice {
warnings = addWarning(warnings, "Your kernel does not support IOPS Block read limit or the cgroup is not mounted. Block I/O IOPS read limit discarded.")
config.Resources.DeviceReadIOps = []string{}
}
if len(config.Resources.DeviceWriteIOps) > 0 && !sysInfo.BlkioWriteIOpsDevice {
warnings = addWarning(warnings, "Your kernel does not support IOPS Block I/O write limit or the cgroup is not mounted. Block I/O IOPS write limit discarded.")
config.Resources.DeviceWriteIOps = []string{}
}
return warnings, nil
}
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