configs

package
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 Go to latest Published: Aug 20, 2021 License: Apache-2.0 Imports: 13 Imported by: 5,795

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Constants

View Source 
const (
	// EXT_COPYUP is a directive to copy up the contents of a directory when
	// a tmpfs is mounted over it.
	EXT_COPYUP = 1 << iota //nolint:golint // ignore "don't use ALL_CAPS" warning
)

Variables

This section is empty.

Functions

func IsNamespaceSupported added in v0.0.9 

func IsNamespaceSupported(ns NamespaceType) bool

IsNamespaceSupported returns whether a namespace is available or not

func NsName added in v1.0.0 

func NsName(ns NamespaceType) string

NsName converts the namespace type to its filename

Types

type Action 

type Action int

Action is taken upon rule match in Seccomp 

const (
	Kill Action = iota + 1
	Errno
	Trap
	Allow
	Trace
	Log
)

type Arg 

type Arg struct {
	Index    uint     `json:"index"`
	Value    uint64   `json:"value"`
	ValueTwo uint64   `json:"value_two"`
	Op       Operator `json:"op"`
}

Arg is a rule to match a specific syscall argument in Seccomp

type Capabilities added in v1.0.0 

type Capabilities struct {
	// Bounding is the set of capabilities checked by the kernel.
	Bounding []string
	// Effective is the set of capabilities checked by the kernel.
	Effective []string
	// Inheritable is the capabilities preserved across execve.
	Inheritable []string
	// Permitted is the limiting superset for effective capabilities.
	Permitted []string
	// Ambient is the ambient set of capabilities that are kept.
	Ambient []string
}

type Cgroup 

type Cgroup struct {
	// Name specifies the name of the cgroup
	Name string `json:"name,omitempty"`

	// Parent specifies the name of parent of cgroup or slice
	Parent string `json:"parent,omitempty"`

	// Path specifies the path to cgroups that are created and/or joined by the container.
	// The path is assumed to be relative to the host system cgroup mountpoint.
	Path string `json:"path"`

	// ScopePrefix describes prefix for the scope name
	ScopePrefix string `json:"scope_prefix"`

	// Paths represent the absolute cgroups paths to join.
	// This takes precedence over Path.
	Paths map[string]string

	// Resources contains various cgroups settings to apply
	*Resources

	// SystemdProps are any additional properties for systemd,
	// derived from org.systemd.property.xxx annotations.
	// Ignored unless systemd is used for managing cgroups.
	SystemdProps []systemdDbus.Property `json:"-"`
}

Cgroup holds properties of a cgroup on Linux.

type Command 

type Command struct {
	Path    string         `json:"path"`
	Args    []string       `json:"args"`
	Env     []string       `json:"env"`
	Dir     string         `json:"dir"`
	Timeout *time.Duration `json:"timeout"`
}

func (Command) Run added in v0.0.4 

func (c Command) Run(s *specs.State) error

type CommandHook added in v0.0.4 

type CommandHook struct {
	Command
}

func NewCommandHook added in v0.0.4 

func NewCommandHook(cmd Command) CommandHook

NewCommandHook will execute the provided command when the hook is run.

type Config 

type Config struct {
	// NoPivotRoot will use MS_MOVE and a chroot to jail the process into the container's rootfs
	// This is a common option when the container is running in ramdisk
	NoPivotRoot bool `json:"no_pivot_root"`

	// ParentDeathSignal specifies the signal that is sent to the container's process in the case
	// that the parent process dies.
	ParentDeathSignal int `json:"parent_death_signal"`

	// Path to a directory containing the container's root filesystem.
	Rootfs string `json:"rootfs"`

	// Umask is the umask to use inside of the container.
	Umask *uint32 `json:"umask"`

	// Readonlyfs will remount the container's rootfs as readonly where only externally mounted
	// bind mounts are writtable.
	Readonlyfs bool `json:"readonlyfs"`

	// Specifies the mount propagation flags to be applied to /.
	RootPropagation int `json:"rootPropagation"`

	// Mounts specify additional source and destination paths that will be mounted inside the container's
	// rootfs and mount namespace if specified
	Mounts []*Mount `json:"mounts"`

	// The device nodes that should be automatically created within the container upon container start.  Note, make sure that the node is marked as allowed in the cgroup as well!
	Devices []*devices.Device `json:"devices"`

	MountLabel string `json:"mount_label"`

	// Hostname optionally sets the container's hostname if provided
	Hostname string `json:"hostname"`

	// Namespaces specifies the container's namespaces that it should setup when cloning the init process
	// If a namespace is not provided that namespace is shared from the container's parent process
	Namespaces Namespaces `json:"namespaces"`

	// Capabilities specify the capabilities to keep when executing the process inside the container
	// All capabilities not specified will be dropped from the processes capability mask
	Capabilities *Capabilities `json:"capabilities"`

	// Networks specifies the container's network setup to be created
	Networks []*Network `json:"networks"`

	// Routes can be specified to create entries in the route table as the container is started
	Routes []*Route `json:"routes"`

	// Cgroups specifies specific cgroup settings for the various subsystems that the container is
	// placed into to limit the resources the container has available
	Cgroups *Cgroup `json:"cgroups"`

	// AppArmorProfile specifies the profile to apply to the process running in the container and is
	// change at the time the process is execed
	AppArmorProfile string `json:"apparmor_profile,omitempty"`

	// ProcessLabel specifies the label to apply to the process running in the container.  It is
	// commonly used by selinux
	ProcessLabel string `json:"process_label,omitempty"`

	// Rlimits specifies the resource limits, such as max open files, to set in the container
	// If Rlimits are not set, the container will inherit rlimits from the parent process
	Rlimits []Rlimit `json:"rlimits,omitempty"`

	// OomScoreAdj specifies the adjustment to be made by the kernel when calculating oom scores
	// for a process. Valid values are between the range [-1000, '1000'], where processes with
	// higher scores are preferred for being killed. If it is unset then we don't touch the current
	// value.
	// More information about kernel oom score calculation here: https://lwn.net/Articles/317814/
	OomScoreAdj *int `json:"oom_score_adj,omitempty"`

	// UidMappings is an array of User ID mappings for User Namespaces
	UidMappings []IDMap `json:"uid_mappings"`

	// GidMappings is an array of Group ID mappings for User Namespaces
	GidMappings []IDMap `json:"gid_mappings"`

	// MaskPaths specifies paths within the container's rootfs to mask over with a bind
	// mount pointing to /dev/null as to prevent reads of the file.
	MaskPaths []string `json:"mask_paths"`

	// ReadonlyPaths specifies paths within the container's rootfs to remount as read-only
	// so that these files prevent any writes.
	ReadonlyPaths []string `json:"readonly_paths"`

	// Sysctl is a map of properties and their values. It is the equivalent of using
	// sysctl -w my.property.name value in Linux.
	Sysctl map[string]string `json:"sysctl"`

	// Seccomp allows actions to be taken whenever a syscall is made within the container.
	// A number of rules are given, each having an action to be taken if a syscall matches it.
	// A default action to be taken if no rules match is also given.
	Seccomp *Seccomp `json:"seccomp"`

	// NoNewPrivileges controls whether processes in the container can gain additional privileges.
	NoNewPrivileges bool `json:"no_new_privileges,omitempty"`

	// Hooks are a collection of actions to perform at various container lifecycle events.
	// CommandHooks are serialized to JSON, but other hooks are not.
	Hooks Hooks

	// Version is the version of opencontainer specification that is supported.
	Version string `json:"version"`

	// Labels are user defined metadata that is stored in the config and populated on the state
	Labels []string `json:"labels"`

	// NoNewKeyring will not allocated a new session keyring for the container.  It will use the
	// callers keyring in this case.
	NoNewKeyring bool `json:"no_new_keyring"`

	// IntelRdt specifies settings for Intel RDT group that the container is placed into
	// to limit the resources (e.g., L3 cache, memory bandwidth) the container has available
	IntelRdt *IntelRdt `json:"intel_rdt,omitempty"`

	// RootlessEUID is set when the runc was launched with non-zero EUID.
	// Note that RootlessEUID is set to false when launched with EUID=0 in userns.
	// When RootlessEUID is set, runc creates a new userns for the container.
	// (config.json needs to contain userns settings)
	RootlessEUID bool `json:"rootless_euid,omitempty"`

	// RootlessCgroups is set when unlikely to have the full access to cgroups.
	// When RootlessCgroups is set, cgroups errors are ignored.
	RootlessCgroups bool `json:"rootless_cgroups,omitempty"`
}

Config defines configuration options for executing a process inside a contained environment.

func (Config) HostGID 

func (c Config) HostGID(containerId int) (int, error)

HostGID gets the translated gid for the process on host which could be different when user namespaces are enabled.

func (Config) HostRootGID added in v1.0.0 

func (c Config) HostRootGID() (int, error)

HostRootGID gets the root gid for the process on host which could be non-zero when user namespaces are enabled.

func (Config) HostRootUID added in v1.0.0 

func (c Config) HostRootUID() (int, error)

HostRootUID gets the root uid for the process on host which could be non-zero when user namespaces are enabled.

func (Config) HostUID 

func (c Config) HostUID(containerId int) (int, error)

HostUID gets the translated uid for the process on host which could be different when user namespaces are enabled.

type FreezerState 

type FreezerState string
const (
	Undefined FreezerState = ""
	Frozen    FreezerState = "FROZEN"
	Thawed    FreezerState = "THAWED"
)

type FuncHook added in v0.0.4 

type FuncHook struct {
	// contains filtered or unexported fields
}

func NewFunctionHook added in v0.0.4 

func NewFunctionHook(f func(*specs.State) error) FuncHook

NewFunctionHook will call the provided function when the hook is run.

func (FuncHook) Run added in v0.0.4 

func (f FuncHook) Run(s *specs.State) error

type Hook added in v0.0.4 

type Hook interface {
	// Run executes the hook with the provided state.
	Run(*specs.State) error
}

type HookList added in v1.0.0 

type HookList []Hook

func (HookList) RunHooks added in v1.0.0 

func (hooks HookList) RunHooks(state *specs.State) error

type HookName added in v1.0.0 

type HookName string
const (
	// Prestart commands are executed after the container namespaces are created,
	// but before the user supplied command is executed from init.
	// Note: This hook is now deprecated
	// Prestart commands are called in the Runtime namespace.
	Prestart HookName = "prestart"

	// CreateRuntime commands MUST be called as part of the create operation after
	// the runtime environment has been created but before the pivot_root has been executed.
	// CreateRuntime is called immediately after the deprecated Prestart hook.
	// CreateRuntime commands are called in the Runtime Namespace.
	CreateRuntime HookName = "createRuntime"

	// CreateContainer commands MUST be called as part of the create operation after
	// the runtime environment has been created but before the pivot_root has been executed.
	// CreateContainer commands are called in the Container namespace.
	CreateContainer HookName = "createContainer"

	// StartContainer commands MUST be called as part of the start operation and before
	// the container process is started.
	// StartContainer commands are called in the Container namespace.
	StartContainer HookName = "startContainer"

	// Poststart commands are executed after the container init process starts.
	// Poststart commands are called in the Runtime Namespace.
	Poststart HookName = "poststart"

	// Poststop commands are executed after the container init process exits.
	// Poststop commands are called in the Runtime Namespace.
	Poststop HookName = "poststop"
)

type Hooks added in v0.0.4 

type Hooks map[HookName]HookList

func (*Hooks) MarshalJSON added in v0.0.9 

func (hooks *Hooks) MarshalJSON() ([]byte, error)

func (*Hooks) UnmarshalJSON added in v0.0.9 

func (hooks *Hooks) UnmarshalJSON(b []byte) error

type HugepageLimit 

type HugepageLimit struct {
	// which type of hugepage to limit.
	Pagesize string `json:"page_size"`

	// usage limit for hugepage.
	Limit uint64 `json:"limit"`
}

type IDMap 

type IDMap struct {
	ContainerID int `json:"container_id"`
	HostID      int `json:"host_id"`
	Size        int `json:"size"`
}

IDMap represents UID/GID Mappings for User Namespaces.

type IfPrioMap 

type IfPrioMap struct {
	Interface string `json:"interface"`
	Priority  int64  `json:"priority"`
}

func (*IfPrioMap) CgroupString 

func (i *IfPrioMap) CgroupString() string

type IntelRdt added in v1.0.0 

type IntelRdt struct {
	// The schema for L3 cache id and capacity bitmask (CBM)
	// Format: "L3:<cache_id0>=<cbm0>;<cache_id1>=<cbm1>;..."
	L3CacheSchema string `json:"l3_cache_schema,omitempty"`

	// The schema of memory bandwidth per L3 cache id
	// Format: "MB:<cache_id0>=bandwidth0;<cache_id1>=bandwidth1;..."
	// The unit of memory bandwidth is specified in "percentages" by
	// default, and in "MBps" if MBA Software Controller is enabled.
	MemBwSchema string `json:"memBwSchema,omitempty"`
}

type Mount 

type Mount struct {
	// Source path for the mount.
	Source string `json:"source"`

	// Destination path for the mount inside the container.
	Destination string `json:"destination"`

	// Device the mount is for.
	Device string `json:"device"`

	// Mount flags.
	Flags int `json:"flags"`

	// Propagation Flags
	PropagationFlags []int `json:"propagation_flags"`

	// Mount data applied to the mount.
	Data string `json:"data"`

	// Relabel source if set, "z" indicates shared, "Z" indicates unshared.
	Relabel string `json:"relabel"`

	// Extensions are additional flags that are specific to runc.
	Extensions int `json:"extensions"`

	// Optional Command to be run before Source is mounted.
	PremountCmds []Command `json:"premount_cmds"`

	// Optional Command to be run after Source is mounted.
	PostmountCmds []Command `json:"postmount_cmds"`
}

type Namespace 

type Namespace struct {
	Type NamespaceType `json:"type"`
	Path string        `json:"path"`
}

Namespace defines configuration for each namespace. It specifies an alternate path that is able to be joined via setns.

func (*Namespace) GetPath 

func (n *Namespace) GetPath(pid int) string

func (*Namespace) Syscall 

func (n *Namespace) Syscall() int

type NamespaceType 

type NamespaceType string
const (
	NEWNET    NamespaceType = "NEWNET"
	NEWPID    NamespaceType = "NEWPID"
	NEWNS     NamespaceType = "NEWNS"
	NEWUTS    NamespaceType = "NEWUTS"
	NEWIPC    NamespaceType = "NEWIPC"
	NEWUSER   NamespaceType = "NEWUSER"
	NEWCGROUP NamespaceType = "NEWCGROUP"
)

func NamespaceTypes 

func NamespaceTypes() []NamespaceType

type Namespaces 

type Namespaces []Namespace

func (*Namespaces) Add 

func (n *Namespaces) Add(t NamespaceType, path string)

func (*Namespaces) CloneFlags 

func (n *Namespaces) CloneFlags() uintptr

CloneFlags parses the container's Namespaces options to set the correct flags on clone, unshare. This function returns flags only for new namespaces.

func (*Namespaces) Contains 

func (n *Namespaces) Contains(t NamespaceType) bool

func (*Namespaces) PathOf added in v0.0.9 

func (n *Namespaces) PathOf(t NamespaceType) string

func (*Namespaces) Remove 

func (n *Namespaces) Remove(t NamespaceType) bool

type Network 

type Network struct {
	// Type sets the networks type, commonly veth and loopback
	Type string `json:"type"`

	// Name of the network interface
	Name string `json:"name"`

	// The bridge to use.
	Bridge string `json:"bridge"`

	// MacAddress contains the MAC address to set on the network interface
	MacAddress string `json:"mac_address"`

	// Address contains the IPv4 and mask to set on the network interface
	Address string `json:"address"`

	// Gateway sets the gateway address that is used as the default for the interface
	Gateway string `json:"gateway"`

	// IPv6Address contains the IPv6 and mask to set on the network interface
	IPv6Address string `json:"ipv6_address"`

	// IPv6Gateway sets the ipv6 gateway address that is used as the default for the interface
	IPv6Gateway string `json:"ipv6_gateway"`

	// Mtu sets the mtu value for the interface and will be mirrored on both the host and
	// container's interfaces if a pair is created, specifically in the case of type veth
	// Note: This does not apply to loopback interfaces.
	Mtu int `json:"mtu"`

	// TxQueueLen sets the tx_queuelen value for the interface and will be mirrored on both the host and
	// container's interfaces if a pair is created, specifically in the case of type veth
	// Note: This does not apply to loopback interfaces.
	TxQueueLen int `json:"txqueuelen"`

	// HostInterfaceName is a unique name of a veth pair that resides on in the host interface of the
	// container.
	HostInterfaceName string `json:"host_interface_name"`

	// HairpinMode specifies if hairpin NAT should be enabled on the virtual interface
	// bridge port in the case of type veth
	// Note: This is unsupported on some systems.
	// Note: This does not apply to loopback interfaces.
	HairpinMode bool `json:"hairpin_mode"`
}

Network defines configuration for a container's networking stack

The network configuration can be omitted from a container causing the container to be setup with the host's networking stack

type Operator 

type Operator int

Operator is a comparison operator to be used when matching syscall arguments in Seccomp 

const (
	EqualTo Operator = iota + 1
	NotEqualTo
	GreaterThan
	GreaterThanOrEqualTo
	LessThan
	LessThanOrEqualTo
	MaskEqualTo
)

type Resources added in v0.0.7 

type Resources struct {
	// Devices is the set of access rules for devices in the container.
	Devices []*devices.Rule `json:"devices"`

	// Memory limit (in bytes)
	Memory int64 `json:"memory"`

	// Memory reservation or soft_limit (in bytes)
	MemoryReservation int64 `json:"memory_reservation"`

	// Total memory usage (memory + swap); set `-1` to enable unlimited swap
	MemorySwap int64 `json:"memory_swap"`

	// CPU shares (relative weight vs. other containers)
	CpuShares uint64 `json:"cpu_shares"`

	// CPU hardcap limit (in usecs). Allowed cpu time in a given period.
	CpuQuota int64 `json:"cpu_quota"`

	// CPU period to be used for hardcapping (in usecs). 0 to use system default.
	CpuPeriod uint64 `json:"cpu_period"`

	// How many time CPU will use in realtime scheduling (in usecs).
	CpuRtRuntime int64 `json:"cpu_rt_quota"`

	// CPU period to be used for realtime scheduling (in usecs).
	CpuRtPeriod uint64 `json:"cpu_rt_period"`

	// CPU to use
	CpusetCpus string `json:"cpuset_cpus"`

	// MEM to use
	CpusetMems string `json:"cpuset_mems"`

	// Process limit; set <= `0' to disable limit.
	PidsLimit int64 `json:"pids_limit"`

	// Specifies per cgroup weight, range is from 10 to 1000.
	BlkioWeight uint16 `json:"blkio_weight"`

	// Specifies tasks' weight in the given cgroup while competing with the cgroup's child cgroups, range is from 10 to 1000, cfq scheduler only
	BlkioLeafWeight uint16 `json:"blkio_leaf_weight"`

	// Weight per cgroup per device, can override BlkioWeight.
	BlkioWeightDevice []*WeightDevice `json:"blkio_weight_device"`

	// IO read rate limit per cgroup per device, bytes per second.
	BlkioThrottleReadBpsDevice []*ThrottleDevice `json:"blkio_throttle_read_bps_device"`

	// IO write rate limit per cgroup per device, bytes per second.
	BlkioThrottleWriteBpsDevice []*ThrottleDevice `json:"blkio_throttle_write_bps_device"`

	// IO read rate limit per cgroup per device, IO per second.
	BlkioThrottleReadIOPSDevice []*ThrottleDevice `json:"blkio_throttle_read_iops_device"`

	// IO write rate limit per cgroup per device, IO per second.
	BlkioThrottleWriteIOPSDevice []*ThrottleDevice `json:"blkio_throttle_write_iops_device"`

	// set the freeze value for the process
	Freezer FreezerState `json:"freezer"`

	// Hugetlb limit (in bytes)
	HugetlbLimit []*HugepageLimit `json:"hugetlb_limit"`

	// Whether to disable OOM Killer
	OomKillDisable bool `json:"oom_kill_disable"`

	// Tuning swappiness behaviour per cgroup
	MemorySwappiness *uint64 `json:"memory_swappiness"`

	// Set priority of network traffic for container
	NetPrioIfpriomap []*IfPrioMap `json:"net_prio_ifpriomap"`

	// Set class identifier for container's network packets
	NetClsClassid uint32 `json:"net_cls_classid_u"`

	// CpuWeight sets a proportional bandwidth limit.
	CpuWeight uint64 `json:"cpu_weight"`

	// Unified is cgroupv2-only key-value map.
	Unified map[string]string `json:"unified"`

	// SkipDevices allows to skip configuring device permissions.
	// Used by e.g. kubelet while creating a parent cgroup (kubepods)
	// common for many containers, and by runc update.
	//
	// NOTE it is impossible to start a container which has this flag set.
	SkipDevices bool `json:"-"`

	// SkipFreezeOnSet is a flag for cgroup manager to skip the cgroup
	// freeze when setting resources. Only applicable to systemd legacy
	// (i.e. cgroup v1) manager (which uses freeze by default to avoid
	// spurious permission errors caused by systemd inability to update
	// device rules in a non-disruptive manner).
	//
	// If not set, a few methods (such as looking into cgroup's
	// devices.list and querying the systemd unit properties) are used
	// during Set() to figure out whether the freeze is required. Those
	// methods may be relatively slow, thus this flag.
	SkipFreezeOnSet bool `json:"-"`
}

type Rlimit 

type Rlimit struct {
	Type int    `json:"type"`
	Hard uint64 `json:"hard"`
	Soft uint64 `json:"soft"`
}

type Route 

type Route struct {
	// Destination specifies the destination IP address and mask in the CIDR form.
	Destination string `json:"destination"`

	// Source specifies the source IP address and mask in the CIDR form.
	Source string `json:"source"`

	// Gateway specifies the gateway IP address.
	Gateway string `json:"gateway"`

	// InterfaceName specifies the device to set this route up for, for example eth0.
	InterfaceName string `json:"interface_name"`
}

Route defines a routing table entry.

Routes can be specified to create entries in the routing table as the container is started.

All of destination, source, and gateway should be either IPv4 or IPv6. One of the three options must be present, and omitted entries will use their IP family default for the route table. For IPv4 for example, setting the gateway to 1.2.3.4 and the interface to eth0 will set up a standard destination of 0.0.0.0(or *) when viewed in the route table.

type Seccomp 

type Seccomp struct {
	DefaultAction   Action     `json:"default_action"`
	Architectures   []string   `json:"architectures"`
	Syscalls        []*Syscall `json:"syscalls"`
	DefaultErrnoRet *uint      `json:"default_errno_ret"`
}

Seccomp represents syscall restrictions By default, only the native architecture of the kernel is allowed to be used for syscalls. Additional architectures can be added by specifying them in Architectures.

type Syscall 

type Syscall struct {
	Name     string `json:"name"`
	Action   Action `json:"action"`
	ErrnoRet *uint  `json:"errnoRet"`
	Args     []*Arg `json:"args"`
}

Syscall is a rule to match a syscall in Seccomp

type ThrottleDevice added in v0.0.5 

type ThrottleDevice struct {

	// Rate is the IO rate limit per cgroup per device
	Rate uint64 `json:"rate"`
	// contains filtered or unexported fields
}

ThrottleDevice struct holds a `major:minor rate_per_second` pair

func NewThrottleDevice added in v0.0.5 

func NewThrottleDevice(major, minor int64, rate uint64) *ThrottleDevice

NewThrottleDevice returns a configured ThrottleDevice pointer

func (*ThrottleDevice) String added in v0.0.5 

func (td *ThrottleDevice) String() string

String formats the struct to be writable to the cgroup specific file

func (*ThrottleDevice) StringName added in v1.0.0 

func (td *ThrottleDevice) StringName(name string) string

StringName formats the struct to be writable to the cgroup specific file

type WeightDevice added in v0.0.5 

type WeightDevice struct {

	// Weight is the bandwidth rate for the device, range is from 10 to 1000
	Weight uint16 `json:"weight"`
	// LeafWeight is the bandwidth rate for the device while competing with the cgroup's child cgroups, range is from 10 to 1000, cfq scheduler only
	LeafWeight uint16 `json:"leafWeight"`
	// contains filtered or unexported fields
}

WeightDevice struct holds a `major:minor weight`|`major:minor leaf_weight` pair

func NewWeightDevice added in v0.0.5 

func NewWeightDevice(major, minor int64, weight, leafWeight uint16) *WeightDevice

NewWeightDevice returns a configured WeightDevice pointer

func (*WeightDevice) LeafWeightString added in v0.0.5 

func (wd *WeightDevice) LeafWeightString() string

LeafWeightString formats the struct to be writable to the cgroup specific file

func (*WeightDevice) WeightString added in v0.0.5 

func (wd *WeightDevice) WeightString() string

WeightString formats the struct to be writable to the cgroup specific file

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