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Package cm

v1.18.8
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Published: 1 day ago | License: Apache-2.0 | Module: k8s.io/kubernetes

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Package Files

Constants

const (
	// Taken from lmctfy https://github.com/google/lmctfy/blob/master/lmctfy/controllers/cpu_controller.cc
	MinShares     = 2
	SharesPerCPU  = 1024
	MilliCPUToCPU = 1000

	// 100000 is equivalent to 100ms
	QuotaPeriod    = 100000
	MinQuotaPeriod = 1000
)

Variables

var RootCgroupName = CgroupName([]string{})

func EnsureDockerInContainer

func EnsureDockerInContainer(dockerAPIVersion *utilversion.Version, oomScoreAdj int, manager *fs.Manager) error

Ensures that the Docker daemon is in the desired container. Temporarily export the function to be used by dockershim. TODO(yujuhong): Move this function to dockershim once kubelet migrates to dockershim as the default.

func GetKubeletContainer

func GetKubeletContainer(kubeletCgroups string) (string, error)

GetKubeletContainer returns the cgroup the kubelet will use

func GetPodCgroupNameSuffix

func GetPodCgroupNameSuffix(podUID types.UID) string

GetPodCgroupNameSuffix returns the last element of the pod CgroupName identifier

func GetRuntimeContainer

func GetRuntimeContainer(containerRuntime, runtimeCgroups string) (string, error)

GetRuntimeContainer returns the cgroup used by the container runtime

func HugePageLimits

func HugePageLimits(resourceList v1.ResourceList) map[int64]int64

HugePageLimits converts the API representation to a map from huge page size (in bytes) to huge page limit (in bytes).

func IsSystemdStyleName

func IsSystemdStyleName(name string) bool

func MilliCPUToQuota

func MilliCPUToQuota(milliCPU int64, period int64) (quota int64)

MilliCPUToQuota converts milliCPU to CFS quota and period values.

func MilliCPUToShares

func MilliCPUToShares(milliCPU int64) uint64

MilliCPUToShares converts the milliCPU to CFS shares.

func NewFakeInternalContainerLifecycle

func NewFakeInternalContainerLifecycle() *fakeInternalContainerLifecycle

func NodeAllocatableRoot

func NodeAllocatableRoot(cgroupRoot, cgroupDriver string) string

NodeAllocatableRoot returns the literal cgroup path for the node allocatable cgroup

func ParseQOSReserved

func ParseQOSReserved(m map[string]string) (*map[v1.ResourceName]int64, error)

ParseQOSReserved parses the --qos-reserve-requests option

type ActivePodsFunc

type ActivePodsFunc func() []*v1.Pod

type CgroupConfig

type CgroupConfig struct {
	// Fully qualified name prior to any driver specific conversions.
	Name CgroupName
	// ResourceParameters contains various cgroups settings to apply.
	ResourceParameters *ResourceConfig
}

CgroupConfig holds the cgroup configuration information. This is common object which is used to specify cgroup information to both systemd and raw cgroup fs implementation of the Cgroup Manager interface.

type CgroupManager

type CgroupManager interface {
	// Create creates and applies the cgroup configurations on the cgroup.
	// It just creates the leaf cgroups.
	// It expects the parent cgroup to already exist.
	Create(*CgroupConfig) error
	// Destroy the cgroup.
	Destroy(*CgroupConfig) error
	// Update cgroup configuration.
	Update(*CgroupConfig) error
	// Exists checks if the cgroup already exists
	Exists(name CgroupName) bool
	// Name returns the literal cgroupfs name on the host after any driver specific conversions.
	// We would expect systemd implementation to make appropriate name conversion.
	// For example, if we pass {"foo", "bar"}
	// then systemd should convert the name to something like
	// foo.slice/foo-bar.slice
	Name(name CgroupName) string
	// CgroupName converts the literal cgroupfs name on the host to an internal identifier.
	CgroupName(name string) CgroupName
	// Pids scans through all subsystems to find pids associated with specified cgroup.
	Pids(name CgroupName) []int
	// ReduceCPULimits reduces the CPU CFS values to the minimum amount of shares.
	ReduceCPULimits(cgroupName CgroupName) error
	// GetResourceStats returns statistics of the specified cgroup as read from the cgroup fs.
	GetResourceStats(name CgroupName) (*ResourceStats, error)
}

CgroupManager allows for cgroup management. Supports Cgroup Creation ,Deletion and Updates.

func NewCgroupManager

func NewCgroupManager(cs *CgroupSubsystems, cgroupDriver string) CgroupManager

NewCgroupManager is a factory method that returns a CgroupManager

type CgroupName

type CgroupName []string

CgroupName is the abstract name of a cgroup prior to any driver specific conversion. It is specified as a list of strings from its individual components, such as: {"kubepods", "burstable", "pod1234-abcd-5678-efgh"}

func NewCgroupName

func NewCgroupName(base CgroupName, components ...string) CgroupName

NewCgroupName composes a new cgroup name. Use RootCgroupName as base to start at the root. This function does some basic check for invalid characters at the name.

func ParseCgroupfsToCgroupName

func ParseCgroupfsToCgroupName(name string) CgroupName

func ParseSystemdToCgroupName

func ParseSystemdToCgroupName(name string) CgroupName

func (CgroupName) ToCgroupfs

func (cgroupName CgroupName) ToCgroupfs() string

func (CgroupName) ToSystemd

func (cgroupName CgroupName) ToSystemd() string

cgroupName.ToSystemd converts the internal cgroup name to a systemd name. For example, the name {"kubepods", "burstable", "pod1234-abcd-5678-efgh"} becomes "/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod1234_abcd_5678_efgh.slice" This function always expands the systemd name into the cgroupfs form. If only the last part is needed, use path.Base(...) on it to discard the rest.

type CgroupSubsystems

type CgroupSubsystems struct {
	// Cgroup subsystem mounts.
	// e.g.: "/sys/fs/cgroup/cpu" -> ["cpu", "cpuacct"]
	Mounts []libcontainercgroups.Mount

	// Cgroup subsystem to their mount location.
	// e.g.: "cpu" -> "/sys/fs/cgroup/cpu"
	MountPoints map[string]string
}

CgroupSubsystems holds information about the mounted cgroup subsystems

func GetCgroupSubsystems

func GetCgroupSubsystems() (*CgroupSubsystems, error)

GetCgroupSubsystems returns information about the mounted cgroup subsystems

type ContainerManager

type ContainerManager interface {
	// Runs the container manager's housekeeping.
	// - Ensures that the Docker daemon is in a container.
	// - Creates the system container where all non-containerized processes run.
	Start(*v1.Node, ActivePodsFunc, config.SourcesReady, status.PodStatusProvider, internalapi.RuntimeService) error

	// SystemCgroupsLimit returns resources allocated to system cgroups in the machine.
	// These cgroups include the system and Kubernetes services.
	SystemCgroupsLimit() v1.ResourceList

	// GetNodeConfig returns a NodeConfig that is being used by the container manager.
	GetNodeConfig() NodeConfig

	// Status returns internal Status.
	Status() Status

	// NewPodContainerManager is a factory method which returns a podContainerManager object
	// Returns a noop implementation if qos cgroup hierarchy is not enabled
	NewPodContainerManager() PodContainerManager

	// GetMountedSubsystems returns the mounted cgroup subsystems on the node
	GetMountedSubsystems() *CgroupSubsystems

	// GetQOSContainersInfo returns the names of top level QoS containers
	GetQOSContainersInfo() QOSContainersInfo

	// GetNodeAllocatableReservation returns the amount of compute resources that have to be reserved from scheduling.
	GetNodeAllocatableReservation() v1.ResourceList

	// GetCapacity returns the amount of compute resources tracked by container manager available on the node.
	GetCapacity() v1.ResourceList

	// GetDevicePluginResourceCapacity returns the node capacity (amount of total device plugin resources),
	// node allocatable (amount of total healthy resources reported by device plugin),
	// and inactive device plugin resources previously registered on the node.
	GetDevicePluginResourceCapacity() (v1.ResourceList, v1.ResourceList, []string)

	// UpdateQOSCgroups performs housekeeping updates to ensure that the top
	// level QoS containers have their desired state in a thread-safe way
	UpdateQOSCgroups() error

	// GetResources returns RunContainerOptions with devices, mounts, and env fields populated for
	// extended resources required by container.
	GetResources(pod *v1.Pod, container *v1.Container) (*kubecontainer.RunContainerOptions, error)

	// UpdatePluginResources calls Allocate of device plugin handler for potential
	// requests for device plugin resources, and returns an error if fails.
	// Otherwise, it updates allocatableResource in nodeInfo if necessary,
	// to make sure it is at least equal to the pod's requested capacity for
	// any registered device plugin resource
	UpdatePluginResources(*schedulernodeinfo.NodeInfo, *lifecycle.PodAdmitAttributes) error

	InternalContainerLifecycle() InternalContainerLifecycle

	// GetPodCgroupRoot returns the cgroup which contains all pods.
	GetPodCgroupRoot() string

	// GetPluginRegistrationHandler returns a plugin registration handler
	// The pluginwatcher's Handlers allow to have a single module for handling
	// registration.
	GetPluginRegistrationHandler() cache.PluginHandler

	// GetDevices returns information about the devices assigned to pods and containers
	GetDevices(podUID, containerName string) []*podresourcesapi.ContainerDevices

	// ShouldResetExtendedResourceCapacity returns whether or not the extended resources should be zeroed,
	// due to node recreation.
	ShouldResetExtendedResourceCapacity() bool

	// GetAllocateResourcesPodAdmitHandler returns an instance of a PodAdmitHandler responsible for allocating pod resources.
	GetAllocateResourcesPodAdmitHandler() lifecycle.PodAdmitHandler

	// UpdateAllocatedDevices frees any Devices that are bound to terminated pods.
	UpdateAllocatedDevices()
}

Manages the containers running on a machine.

func NewContainerManager

func NewContainerManager(mountUtil mount.Interface, cadvisorInterface cadvisor.Interface, nodeConfig NodeConfig, failSwapOn bool, devicePluginEnabled bool, recorder record.EventRecorder) (ContainerManager, error)

TODO(vmarmol): Add limits to the system containers. Takes the absolute name of the specified containers. Empty container name disables use of the specified container.

func NewStubContainerManager

func NewStubContainerManager() ContainerManager

func NewStubContainerManagerWithExtendedResource

func NewStubContainerManagerWithExtendedResource(shouldResetExtendedResourceCapacity bool) ContainerManager

type InternalContainerLifecycle

type InternalContainerLifecycle interface {
	PreStartContainer(pod *v1.Pod, container *v1.Container, containerID string) error
	PreStopContainer(containerID string) error
	PostStopContainer(containerID string) error
}

type KernelTunableBehavior

type KernelTunableBehavior string
const (
	KernelTunableWarn   KernelTunableBehavior = "warn"
	KernelTunableError  KernelTunableBehavior = "error"
	KernelTunableModify KernelTunableBehavior = "modify"
)

type MemoryStats

type MemoryStats struct {
	// Memory usage (in bytes).
	Usage int64
}

MemoryStats holds the on-demand statistics from the memory cgroup

type NodeAllocatableConfig

type NodeAllocatableConfig struct {
	KubeReservedCgroupName   string
	SystemReservedCgroupName string
	ReservedSystemCPUs       cpuset.CPUSet
	EnforceNodeAllocatable   sets.String
	KubeReserved             v1.ResourceList
	SystemReserved           v1.ResourceList
	HardEvictionThresholds   []evictionapi.Threshold
}

type NodeConfig

type NodeConfig struct {
	RuntimeCgroupsName    string
	SystemCgroupsName     string
	KubeletCgroupsName    string
	ContainerRuntime      string
	CgroupsPerQOS         bool
	CgroupRoot            string
	CgroupDriver          string
	KubeletRootDir        string
	ProtectKernelDefaults bool
	NodeAllocatableConfig
	QOSReserved                           map[v1.ResourceName]int64
	ExperimentalCPUManagerPolicy          string
	ExperimentalCPUManagerReconcilePeriod time.Duration
	ExperimentalPodPidsLimit              int64
	EnforceCPULimits                      bool
	CPUCFSQuotaPeriod                     time.Duration
	ExperimentalTopologyManagerPolicy     string
}

type PodContainerManager

type PodContainerManager interface {
	// GetPodContainerName returns the CgroupName identifier, and its literal cgroupfs form on the host.
	GetPodContainerName(*v1.Pod) (CgroupName, string)

	// EnsureExists takes a pod as argument and makes sure that
	// pod cgroup exists if qos cgroup hierarchy flag is enabled.
	// If the pod cgroup doesn't already exist this method creates it.
	EnsureExists(*v1.Pod) error

	// Exists returns true if the pod cgroup exists.
	Exists(*v1.Pod) bool

	// Destroy takes a pod Cgroup name as argument and destroys the pod's container.
	Destroy(name CgroupName) error

	// ReduceCPULimits reduces the CPU CFS values to the minimum amount of shares.
	ReduceCPULimits(name CgroupName) error

	// GetAllPodsFromCgroups enumerates the set of pod uids to their associated cgroup based on state of cgroupfs system.
	GetAllPodsFromCgroups() (map[types.UID]CgroupName, error)

	// IsPodCgroup returns true if the literal cgroupfs name corresponds to a pod
	IsPodCgroup(cgroupfs string) (bool, types.UID)
}

PodContainerManager stores and manages pod level containers The Pod workers interact with the PodContainerManager to create and destroy containers for the pod.

type QOSContainerManager

type QOSContainerManager interface {
	Start(func() v1.ResourceList, ActivePodsFunc) error
	GetQOSContainersInfo() QOSContainersInfo
	UpdateCgroups() error
}

func NewQOSContainerManager

func NewQOSContainerManager(subsystems *CgroupSubsystems, cgroupRoot CgroupName, nodeConfig NodeConfig, cgroupManager CgroupManager) (QOSContainerManager, error)

type QOSContainersInfo

type QOSContainersInfo struct {
	Guaranteed CgroupName
	BestEffort CgroupName
	Burstable  CgroupName
}

QOSContainersInfo stores the names of containers per qos

type ResourceConfig

type ResourceConfig struct {
	// Memory limit (in bytes).
	Memory *int64
	// CPU shares (relative weight vs. other containers).
	CpuShares *uint64
	// CPU hardcap limit (in usecs). Allowed cpu time in a given period.
	CpuQuota *int64
	// CPU quota period.
	CpuPeriod *uint64
	// HugePageLimit map from page size (in bytes) to limit (in bytes)
	HugePageLimit map[int64]int64
	// Maximum number of pids
	PidsLimit *int64
}

ResourceConfig holds information about all the supported cgroup resource parameters.

func ResourceConfigForPod

func ResourceConfigForPod(pod *v1.Pod, enforceCPULimits bool, cpuPeriod uint64) *ResourceConfig

ResourceConfigForPod takes the input pod and outputs the cgroup resource config.

type ResourceStats

type ResourceStats struct {
	// Memory statistics.
	MemoryStats *MemoryStats
}

ResourceStats holds on-demand statistics from various cgroup subsystems

type Status

type Status struct {
	// Any soft requirements that were unsatisfied.
	SoftRequirements error
}
Documentation was rendered with GOOS=linux and GOARCH=amd64.

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