// 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
}
// 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)
// NOTE: We do not enforce a minimum value for swap limits for zones on Solaris and
// therefore we will not do that for Docker container either.
if hostConfig.Memory > 0 && !sysInfo.MemoryLimit {
warnings = append(warnings, "Your kernel does not support memory limit capabilities. Limitation discarded.")
logrus.Warnf("Your kernel does not support memory limit capabilities. Limitation discarded.")
hostConfig.Memory = 0
hostConfig.MemorySwap = -1
}
if hostConfig.Memory > 0 && hostConfig.MemorySwap != -1 && !sysInfo.SwapLimit {
warnings = append(warnings, "Your kernel does not support swap limit capabilities, memory limited without swap.")
logrus.Warnf("Your kernel does not support swap limit capabilities, memory limited without swap.")
hostConfig.MemorySwap = -1
}
if hostConfig.Memory > 0 && hostConfig.MemorySwap > 0 && hostConfig.MemorySwap < hostConfig.Memory {
return warnings, fmt.Errorf("Minimum memoryswap limit should be larger than memory limit, see usage.")
}
// Solaris NOTE: We allow and encourage setting the swap without setting the memory limit.
if hostConfig.MemorySwappiness != nil && *hostConfig.MemorySwappiness != -1 && !sysInfo.MemorySwappiness {
warnings = append(warnings, "Your kernel does not support memory swappiness capabilities, memory swappiness discarded.")
logrus.Warnf("Your kernel does not support memory swappiness capabilities, memory swappiness discarded.")
hostConfig.MemorySwappiness = nil
}
if hostConfig.MemoryReservation > 0 && !sysInfo.MemoryReservation {
warnings = append(warnings, "Your kernel does not support memory soft limit capabilities. Limitation discarded.")
logrus.Warnf("Your kernel does not support memory soft limit capabilities. Limitation discarded.")
hostConfig.MemoryReservation = 0
}
if hostConfig.Memory > 0 && hostConfig.MemoryReservation > 0 && hostConfig.Memory < hostConfig.MemoryReservation {
return warnings, fmt.Errorf("Minimum memory limit should be larger than memory reservation limit, see usage.")
}
if hostConfig.KernelMemory > 0 && !sysInfo.KernelMemory {
warnings = append(warnings, "Your kernel does not support kernel memory limit capabilities. Limitation discarded.")
logrus.Warnf("Your kernel does not support kernel memory limit capabilities. Limitation discarded.")
hostConfig.KernelMemory = 0
}
if hostConfig.CPUShares != 0 && !sysInfo.CPUShares {
warnings = append(warnings, "Your kernel does not support CPU shares. Shares discarded.")
logrus.Warnf("Your kernel does not support CPU shares. Shares discarded.")
hostConfig.CPUShares = 0
}
if hostConfig.CPUShares < 0 {
warnings = append(warnings, "Invalid CPUShares value. Must be positive. Discarding.")
logrus.Warnf("Invalid CPUShares value. Must be positive. Discarding.")
hostConfig.CPUQuota = 0
}
if hostConfig.CPUShares > 0 && !sysinfo.IsCPUSharesAvailable() {
warnings = append(warnings, "Global zone default scheduling class not FSS. Discarding shares.")
logrus.Warnf("Global zone default scheduling class not FSS. Discarding shares.")
hostConfig.CPUShares = 0
}
// Solaris NOTE: Linux does not do negative checking for CPUShares and Quota here. But it makes sense to.
if hostConfig.CPUPeriod > 0 && !sysInfo.CPUCfsPeriod {
warnings = append(warnings, "Your kernel does not support CPU cfs period. Period discarded.")
logrus.Warnf("Your kernel does not support CPU cfs period. Period discarded.")
if hostConfig.CPUQuota > 0 {
warnings = append(warnings, "Quota will be applied on default period, not period specified.")
logrus.Warnf("Quota will be applied on default period, not period specified.")
}
hostConfig.CPUPeriod = 0
}
if hostConfig.CPUQuota != 0 && !sysInfo.CPUCfsQuota {
warnings = append(warnings, "Your kernel does not support CPU cfs quota. Quota discarded.")
logrus.Warnf("Your kernel does not support CPU cfs quota. Quota discarded.")
hostConfig.CPUQuota = 0
}
if hostConfig.CPUQuota < 0 {
warnings = append(warnings, "Invalid CPUQuota value. Must be positive. Discarding.")
logrus.Warnf("Invalid CPUQuota value. Must be positive. Discarding.")
hostConfig.CPUQuota = 0
}
if (hostConfig.CpusetCpus != "" || hostConfig.CpusetMems != "") && !sysInfo.Cpuset {
warnings = append(warnings, "Your kernel does not support cpuset. Cpuset discarded.")
logrus.Warnf("Your kernel does not support cpuset. Cpuset discarded.")
hostConfig.CpusetCpus = ""
hostConfig.CpusetMems = ""
}
cpusAvailable, err := sysInfo.IsCpusetCpusAvailable(hostConfig.CpusetCpus)
if err != nil {
return warnings, fmt.Errorf("Invalid value %s for cpuset cpus.", hostConfig.CpusetCpus)
}
if !cpusAvailable {
return warnings, fmt.Errorf("Requested CPUs are not available - requested %s, available: %s.", hostConfig.CpusetCpus, sysInfo.Cpus)
}
memsAvailable, err := sysInfo.IsCpusetMemsAvailable(hostConfig.CpusetMems)
if err != nil {
return warnings, fmt.Errorf("Invalid value %s for cpuset mems.", hostConfig.CpusetMems)
}
if !memsAvailable {
return warnings, fmt.Errorf("Requested memory nodes are not available - requested %s, available: %s.", hostConfig.CpusetMems, sysInfo.Mems)
}
if hostConfig.BlkioWeight > 0 && !sysInfo.BlkioWeight {
warnings = append(warnings, "Your kernel does not support Block I/O weight. Weight discarded.")
logrus.Warnf("Your kernel does not support Block I/O weight. Weight discarded.")
hostConfig.BlkioWeight = 0
}
if hostConfig.OomKillDisable != nil && !sysInfo.OomKillDisable {
*hostConfig.OomKillDisable = false
// Don't warn; this is the default setting but only applicable to Linux
}
if sysInfo.IPv4ForwardingDisabled {
warnings = append(warnings, "IPv4 forwarding is disabled. Networking will not work.")
logrus.Warnf("IPv4 forwarding is disabled. Networking will not work")
}
// Solaris NOTE: We do not allow setting Linux specific options, so check and warn for all of them.
if hostConfig.CapAdd != nil || hostConfig.CapDrop != nil {
warnings = append(warnings, "Adding or dropping kernel capabilities unsupported on Solaris.Discarding capabilities lists.")
logrus.Warnf("Adding or dropping kernel capabilities unsupported on Solaris.Discarding capabilities lists.")
hostConfig.CapAdd = nil
hostConfig.CapDrop = nil
}
if hostConfig.GroupAdd != nil {
warnings = append(warnings, "Additional groups unsupported on Solaris.Discarding groups lists.")
logrus.Warnf("Additional groups unsupported on Solaris.Discarding groups lists.")
hostConfig.GroupAdd = nil
}
if hostConfig.IpcMode != "" {
warnings = append(warnings, "IPC namespace assignment unsupported on Solaris.Discarding IPC setting.")
logrus.Warnf("IPC namespace assignment unsupported on Solaris.Discarding IPC setting.")
hostConfig.IpcMode = ""
}
if hostConfig.PidMode != "" {
warnings = append(warnings, "PID namespace setting unsupported on Solaris. Running container in host PID namespace.")
logrus.Warnf("PID namespace setting unsupported on Solaris. Running container in host PID namespace.")
hostConfig.PidMode = ""
}
if hostConfig.Privileged {
warnings = append(warnings, "Privileged mode unsupported on Solaris. Discarding privileged mode setting.")
logrus.Warnf("Privileged mode unsupported on Solaris. Discarding privileged mode setting.")
hostConfig.Privileged = false
}
if hostConfig.UTSMode != "" {
warnings = append(warnings, "UTS namespace assignment unsupported on Solaris.Discarding UTS setting.")
logrus.Warnf("UTS namespace assignment unsupported on Solaris.Discarding UTS setting.")
hostConfig.UTSMode = ""
}
if hostConfig.CgroupParent != "" {
warnings = append(warnings, "Specifying Cgroup parent unsupported on Solaris. Discarding cgroup parent setting.")
logrus.Warnf("Specifying Cgroup parent unsupported on Solaris. Discarding cgroup parent setting.")
hostConfig.CgroupParent = ""
}
if hostConfig.Ulimits != nil {
warnings = append(warnings, "Specifying ulimits unsupported on Solaris. Discarding ulimits setting.")
logrus.Warnf("Specifying ulimits unsupported on Solaris. Discarding ulimits setting.")
hostConfig.Ulimits = nil
}
return warnings, nil
}