package sysinfo // import "github.com/docker/docker/pkg/sysinfo" import "github.com/docker/docker/pkg/parsers" // SysInfo stores information about which features a kernel supports. // TODO Windows: Factor out platform specific capabilities. type SysInfo struct { // Whether the kernel supports AppArmor or not AppArmor bool // Whether the kernel supports Seccomp or not Seccomp bool cgroupMemInfo cgroupCPUInfo cgroupBlkioInfo cgroupCpusetInfo cgroupPids // Whether the kernel supports cgroup namespaces or not CgroupNamespaces bool // Whether IPv4 forwarding is supported or not, if this was disabled, networking will not work IPv4ForwardingDisabled bool // Whether bridge-nf-call-iptables is supported or not BridgeNFCallIPTablesDisabled bool // Whether bridge-nf-call-ip6tables is supported or not BridgeNFCallIP6TablesDisabled bool // Whether the cgroup has the mountpoint of "devices" or not CgroupDevicesEnabled bool } type cgroupMemInfo struct { // Whether memory limit is supported or not MemoryLimit bool // Whether swap limit is supported or not SwapLimit bool // Whether soft limit is supported or not MemoryReservation bool // Whether OOM killer disable is supported or not OomKillDisable bool // Whether memory swappiness is supported or not MemorySwappiness bool // Whether kernel memory limit is supported or not KernelMemory bool // Whether kernel memory TCP limit is supported or not KernelMemoryTCP bool } type cgroupCPUInfo struct { // Whether CPU shares is supported or not CPUShares bool // Whether CPU CFS(Completely Fair Scheduler) period is supported or not CPUCfsPeriod bool // Whether CPU CFS(Completely Fair Scheduler) quota is supported or not CPUCfsQuota bool // Whether CPU real-time period is supported or not CPURealtimePeriod bool // Whether CPU real-time runtime is supported or not CPURealtimeRuntime bool } type cgroupBlkioInfo struct { // Whether Block IO weight is supported or not BlkioWeight bool // Whether Block IO weight_device is supported or not BlkioWeightDevice bool // Whether Block IO read limit in bytes per second is supported or not BlkioReadBpsDevice bool // Whether Block IO write limit in bytes per second is supported or not BlkioWriteBpsDevice bool // Whether Block IO read limit in IO per second is supported or not BlkioReadIOpsDevice bool // Whether Block IO write limit in IO per second is supported or not BlkioWriteIOpsDevice bool } type cgroupCpusetInfo struct { // Whether Cpuset is supported or not Cpuset bool // Available Cpuset's cpus Cpus string // Available Cpuset's memory nodes Mems string } type cgroupPids struct { // Whether Pids Limit is supported or not PidsLimit bool } // IsCpusetCpusAvailable returns `true` if the provided string set is contained // in cgroup's cpuset.cpus set, `false` otherwise. // If error is not nil a parsing error occurred. func (c cgroupCpusetInfo) IsCpusetCpusAvailable(provided string) (bool, error) { return isCpusetListAvailable(provided, c.Cpus) } // IsCpusetMemsAvailable returns `true` if the provided string set is contained // in cgroup's cpuset.mems set, `false` otherwise. // If error is not nil a parsing error occurred. func (c cgroupCpusetInfo) IsCpusetMemsAvailable(provided string) (bool, error) { return isCpusetListAvailable(provided, c.Mems) } func isCpusetListAvailable(provided, available string) (bool, error) { parsedAvailable, err := parsers.ParseUintList(available) if err != nil { return false, err } // 8192 is the normal maximum number of CPUs in Linux, so accept numbers up to this // or more if we actually have more CPUs. max := 8192 for m := range parsedAvailable { if m > max { max = m } } parsedProvided, err := parsers.ParseUintListMaximum(provided, max) if err != nil { return false, err } for k := range parsedProvided { if !parsedAvailable[k] { return false, nil } } return true, nil }