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5d10c6ec67
- Omit `KernelMemory` and `KernelMemoryTCP` fields in `/info` response if they're not supported, or when using API v1.42 or up. - Re-enable detection of `KernelMemory` (as it's still needed for older API versions) - Remove warning about kernel memory TCP in daemon logs (a warning is still returned by the `/info` endpoint, but we can consider removing that). - Prevent incorrect "Minimum kernel memory limit allowed" error if the value was reset because it's not supported by the host. Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
169 lines
4.8 KiB
Go
169 lines
4.8 KiB
Go
package sysinfo // import "github.com/docker/docker/pkg/sysinfo"
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import "github.com/docker/docker/pkg/parsers"
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// Opt for New().
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type Opt func(info *SysInfo)
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// SysInfo stores information about which features a kernel supports.
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// TODO Windows: Factor out platform specific capabilities.
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type SysInfo struct {
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// Whether the kernel supports AppArmor or not
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AppArmor bool
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// Whether the kernel supports Seccomp or not
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Seccomp bool
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cgroupMemInfo
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cgroupCPUInfo
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cgroupBlkioInfo
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cgroupCpusetInfo
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cgroupPids
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// Whether the kernel supports cgroup namespaces or not
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CgroupNamespaces bool
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// Whether IPv4 forwarding is supported or not, if this was disabled, networking will not work
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IPv4ForwardingDisabled bool
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// Whether bridge-nf-call-iptables is supported or not
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BridgeNFCallIPTablesDisabled bool
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// Whether bridge-nf-call-ip6tables is supported or not
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BridgeNFCallIP6TablesDisabled bool
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// Whether the cgroup has the mountpoint of "devices" or not
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CgroupDevicesEnabled bool
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// Whether the cgroup is in unified mode (v2).
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CgroupUnified bool
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// Warnings contains a slice of warnings that occurred while collecting
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// system information. These warnings are intended to be informational
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// messages for the user, and can either be logged or returned to the
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// client; they are not intended to be parsed / used for other purposes,
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// and do not have a fixed format.
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Warnings []string
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// cgMounts is the list of cgroup v1 mount paths, indexed by subsystem, to
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// inspect availability of subsystems.
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cgMounts map[string]string
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// cg2GroupPath is the cgroup v2 group path to inspect availability of the controllers.
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cg2GroupPath string
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// cg2Controllers is an index of available cgroup v2 controllers.
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cg2Controllers map[string]struct{}
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}
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type cgroupMemInfo struct {
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// Whether memory limit is supported or not
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MemoryLimit bool
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// Whether swap limit is supported or not
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SwapLimit bool
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// Whether soft limit is supported or not
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MemoryReservation bool
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// Whether OOM killer disable is supported or not
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OomKillDisable bool
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// Whether memory swappiness is supported or not
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MemorySwappiness bool
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// Whether kernel memory limit is supported or not. This option is used to
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// detect support for kernel-memory limits on API < v1.42. Kernel memory
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// limit (`kmem.limit_in_bytes`) is not supported on cgroups v2, and has been
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// removed in kernel 5.4.
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KernelMemory bool
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// Whether kernel memory TCP limit is supported or not. Kernel memory TCP
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// limit (`memory.kmem.tcp.limit_in_bytes`) is not supported on cgroups v2.
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KernelMemoryTCP bool
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}
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type cgroupCPUInfo struct {
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// Whether CPU shares is supported or not
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CPUShares bool
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// Whether CPU CFS (Completely Fair Scheduler) is supported
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CPUCfs bool
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// Whether CPU real-time scheduler is supported
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CPURealtime bool
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}
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type cgroupBlkioInfo struct {
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// Whether Block IO weight is supported or not
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BlkioWeight bool
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// Whether Block IO weight_device is supported or not
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BlkioWeightDevice bool
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// Whether Block IO read limit in bytes per second is supported or not
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BlkioReadBpsDevice bool
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// Whether Block IO write limit in bytes per second is supported or not
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BlkioWriteBpsDevice bool
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// Whether Block IO read limit in IO per second is supported or not
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BlkioReadIOpsDevice bool
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// Whether Block IO write limit in IO per second is supported or not
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BlkioWriteIOpsDevice bool
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}
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type cgroupCpusetInfo struct {
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// Whether Cpuset is supported or not
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Cpuset bool
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// Available Cpuset's cpus
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Cpus string
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// Available Cpuset's memory nodes
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Mems string
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}
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type cgroupPids struct {
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// Whether Pids Limit is supported or not
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PidsLimit bool
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}
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// IsCpusetCpusAvailable returns `true` if the provided string set is contained
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// in cgroup's cpuset.cpus set, `false` otherwise.
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// If error is not nil a parsing error occurred.
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func (c cgroupCpusetInfo) IsCpusetCpusAvailable(provided string) (bool, error) {
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return isCpusetListAvailable(provided, c.Cpus)
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}
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// IsCpusetMemsAvailable returns `true` if the provided string set is contained
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// in cgroup's cpuset.mems set, `false` otherwise.
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// If error is not nil a parsing error occurred.
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func (c cgroupCpusetInfo) IsCpusetMemsAvailable(provided string) (bool, error) {
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return isCpusetListAvailable(provided, c.Mems)
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}
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func isCpusetListAvailable(provided, available string) (bool, error) {
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parsedAvailable, err := parsers.ParseUintList(available)
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if err != nil {
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return false, err
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}
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// 8192 is the normal maximum number of CPUs in Linux, so accept numbers up to this
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// or more if we actually have more CPUs.
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max := 8192
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for m := range parsedAvailable {
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if m > max {
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max = m
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}
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}
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parsedProvided, err := parsers.ParseUintListMaximum(provided, max)
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if err != nil {
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return false, err
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}
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for k := range parsedProvided {
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if !parsedAvailable[k] {
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return false, nil
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}
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}
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return true, nil
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}
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