boot

package
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 Go to latest Published: May 9, 2021 License: Apache-2.0, MIT Imports: 108 Imported by: 0

Documentation

Overview

Package boot loads the kernel and runs a container.

Index

Constants

View Source 
const (
	// ContainerCheckpoint checkpoints a container.
	ContainerCheckpoint = "containerManager.Checkpoint"

	// ContainerCreate creates a container.
	ContainerCreate = "containerManager.Create"

	// ContainerDestroy is used to stop a non-root container and free all
	// associated resources in the sandbox.
	ContainerDestroy = "containerManager.Destroy"

	// ContainerEvent is the URPC endpoint for getting stats about the
	// container used by "runsc events".
	ContainerEvent = "containerManager.Event"

	// ContainerExecuteAsync is the URPC endpoint for executing a command in a
	// container.
	ContainerExecuteAsync = "containerManager.ExecuteAsync"

	// ContainerPause pauses the container.
	ContainerPause = "containerManager.Pause"

	// ContainerProcesses is the URPC endpoint for getting the list of
	// processes running in a container.
	ContainerProcesses = "containerManager.Processes"

	// ContainerRestore restores a container from a statefile.
	ContainerRestore = "containerManager.Restore"

	// ContainerResume unpauses the paused container.
	ContainerResume = "containerManager.Resume"

	// ContainerSignal is used to send a signal to a container.
	ContainerSignal = "containerManager.Signal"

	// ContainerSignalProcess is used to send a signal to a particular
	// process in a container.
	ContainerSignalProcess = "containerManager.SignalProcess"

	// ContainerStart is the URPC endpoint for running a non-root container
	// within a sandbox.
	ContainerStart = "containerManager.Start"

	// ContainerWait is used to wait on the init process of the container
	// and return its ExitStatus.
	ContainerWait = "containerManager.Wait"

	// ContainerWaitPID is used to wait on a process with a certain PID in
	// the sandbox and return its ExitStatus.
	ContainerWaitPID = "containerManager.WaitPID"

	// NetworkCreateLinksAndRoutes is the URPC endpoint for creating links
	// and routes in a network stack.
	NetworkCreateLinksAndRoutes = "Network.CreateLinksAndRoutes"

	// RootContainerStart is the URPC endpoint for starting a new sandbox
	// with root container.
	RootContainerStart = "containerManager.StartRoot"

	// SandboxStacks collects sandbox stacks for debugging.
	SandboxStacks = "debug.Stacks"
)
View Source 
const (
	CPUProfile   = "Profile.CPU"
	HeapProfile  = "Profile.Heap"
	BlockProfile = "Profile.Block"
	MutexProfile = "Profile.Mutex"
	Trace        = "Profile.Trace"
)

Profiling related commands (see pprof.go for more details).

View Source 
const (
	ChangeLogging = "Logging.Change"
)

Logging related commands (see logging.go for more details).

View Source 
const (

	// MountPrefix is the annotation prefix for mount hints.
	MountPrefix = "dev.gvisor.spec.mount."
)

Variables

View Source 
var (
	// DefaultLoopbackLink contains IP addresses and routes of "127.0.0.1/8" and
	// "::1/8" on "lo" interface.
	DefaultLoopbackLink = LoopbackLink{
		Name: "lo",
		Addresses: []IPWithPrefix{
			{Address: net.IP("\x7f\x00\x00\x01"), PrefixLen: 8},
			{Address: net.IPv6loopback, PrefixLen: 128},
		},
		Routes: []Route{
			{
				Destination: net.IPNet{
					IP:   net.IPv4(0x7f, 0, 0, 0),
					Mask: net.IPv4Mask(0xff, 0, 0, 0),
				},
			},
			{
				Destination: net.IPNet{
					IP:   net.IPv6loopback,
					Mask: net.IPMask(strings.Repeat("\xff", net.IPv6len)),
				},
			},
		},
	}
)

Functions

func ControlSocketAddr 

func ControlSocketAddr(id string) string

ControlSocketAddr generates an abstract unix socket name for the given ID.

Types

type Args 

type Args struct {
	// Id is the sandbox ID.
	ID string
	// Spec is the sandbox specification.
	Spec *specs.Spec
	// Conf is the system configuration.
	Conf *config.Config
	// ControllerFD is the FD to the URPC controller. The Loader takes ownership
	// of this FD and may close it at any time.
	ControllerFD int
	// Device is an optional argument that is passed to the platform. The Loader
	// takes ownership of this file and may close it at any time.
	Device *os.File
	// GoferFDs is an array of FDs used to connect with the Gofer. The Loader
	// takes ownership of these FDs and may close them at any time.
	GoferFDs []int
	// StdioFDs is the stdio for the application. The Loader takes ownership of
	// these FDs and may close them at any time.
	StdioFDs []int
	// NumCPU is the number of CPUs to create inside the sandbox.
	NumCPU int
	// TotalMem is the initial amount of total memory to report back to the
	// container.
	TotalMem uint64
	// UserLogFD is the file descriptor to write user logs to.
	UserLogFD int
}

Args are the arguments for New().

type CPU 

type CPU struct {
	Usage CPUUsage `json:"usage"`
}

CPU contains stats on the CPU.

type CPUUsage 

type CPUUsage struct {
	Kernel uint64   `json:"kernel,omitempty"`
	User   uint64   `json:"user,omitempty"`
	Total  uint64   `json:"total,omitempty"`
	PerCPU []uint64 `json:"percpu,omitempty"`
}

CPUUsage contains stats on CPU usage.

type CreateArgs 

type CreateArgs struct {
	// CID is the ID of the container to start.
	CID string

	// FilePayload may contain a TTY file for the terminal, if enabled.
	urpc.FilePayload
}

CreateArgs contains arguments to the Create method.

type CreateLinksAndRoutesArgs 

type CreateLinksAndRoutesArgs struct {
	// FilePayload contains the fds associated with the FDBasedLinks. The
	// number of fd's should match the sum of the NumChannels field of the
	// FDBasedLink entries below.
	urpc.FilePayload

	LoopbackLinks []LoopbackLink
	FDBasedLinks  []FDBasedLink

	Defaultv4Gateway DefaultRoute
	Defaultv6Gateway DefaultRoute
}

CreateLinksAndRoutesArgs are arguments to CreateLinkAndRoutes.

type DefaultRoute 

type DefaultRoute struct {
	Route Route
	Name  string
}

DefaultRoute represents a catch all route to the default gateway.

type Event 

type Event struct {
	Type string `json:"type"`
	ID   string `json:"id"`
	Data Stats  `json:"data"`
}

Event struct for encoding the event data to JSON. Corresponds to runc's main.event struct.

type EventOut 

type EventOut struct {
	Event Event `json:"event"`

	// ContainerUsage maps each container ID to its total CPU usage.
	ContainerUsage map[string]uint64 `json:"containerUsage"`
}

EventOut is the return type of the Event command. 

type FDBasedLink struct {
	Name               string
	MTU                int
	Addresses          []IPWithPrefix
	Routes             []Route
	GSOMaxSize         uint32
	SoftwareGSOEnabled bool
	TXChecksumOffload  bool
	RXChecksumOffload  bool
	LinkAddress        net.HardwareAddr
	QDisc              config.QueueingDiscipline

	// NumChannels controls how many underlying FD's are to be used to
	// create this endpoint.
	NumChannels int
}

FDBasedLink configures an fd-based link.

type IPWithPrefix 

type IPWithPrefix struct {
	// Address is a network address.
	Address net.IP

	// PrefixLen is the subnet prefix length.
	PrefixLen int
}

IPWithPrefix is an address with its subnet prefix length.

func (IPWithPrefix) String 

func (ip IPWithPrefix) String() string

type Loader 

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

Loader keeps state needed to start the kernel and run the container.

func New 

func New(args Args) (*Loader, error)

New initializes a new kernel loader configured by spec. New also handles setting up a kernel for restoring a container.

func (*Loader) Destroy 

func (l *Loader) Destroy()

Destroy cleans up all resources used by the loader.

Note that this will block until all open control server connections have been closed. For that reason, this should NOT be called in a defer, because a panic in a control server rpc would then hang forever.

func (*Loader) Run 

func (l *Loader) Run() error

Run runs the root container.

func (*Loader) WaitExit 

func (l *Loader) WaitExit() kernel.ExitStatus

WaitExit waits for the root container to exit, and returns its exit status.

func (*Loader) WaitForStartSignal 

func (l *Loader) WaitForStartSignal()

WaitForStartSignal waits for a start signal from the control server. 

type LoopbackLink struct {
	Name      string
	Addresses []IPWithPrefix
	Routes    []Route
}

LoopbackLink configures a loopback li nk.

type Memory 

type Memory struct {
	Cache     uint64            `json:"cache,omitempty"`
	Usage     MemoryEntry       `json:"usage,omitempty"`
	Swap      MemoryEntry       `json:"swap,omitempty"`
	Kernel    MemoryEntry       `json:"kernel,omitempty"`
	KernelTCP MemoryEntry       `json:"kernelTCP,omitempty"`
	Raw       map[string]uint64 `json:"raw,omitempty"`
}

Memory contains stats on memory.

type MemoryEntry 

type MemoryEntry struct {
	Limit   uint64 `json:"limit"`
	Usage   uint64 `json:"usage,omitempty"`
	Max     uint64 `json:"max,omitempty"`
	Failcnt uint64 `json:"failcnt"`
}

MemoryEntry contains stats on a kind of memory.

type Network 

type Network struct {
	Stack *stack.Stack
}

Network exposes methods that can be used to configure a network stack.

func (*Network) CreateLinksAndRoutes 

func (n *Network) CreateLinksAndRoutes(args *CreateLinksAndRoutesArgs, _ *struct{}) error

CreateLinksAndRoutes creates links and routes in a network stack. It should only be called once.

type Pids 

type Pids struct {
	Current uint64 `json:"current,omitempty"`
	Limit   uint64 `json:"limit,omitempty"`
}

Pids contains stats on processes.

type RestoreOpts 

type RestoreOpts struct {
	// FilePayload contains the state file to be restored, followed by the
	// platform device file if necessary.
	urpc.FilePayload

	// SandboxID contains the ID of the sandbox.
	SandboxID string
}

RestoreOpts contains options related to restoring a container's file system.

type Route 

type Route struct {
	Destination net.IPNet
	Gateway     net.IP
}

Route represents a route in the network stack.

func (*Route) Empty 

func (r *Route) Empty() bool

Empty returns true if route hasn't been set.

type SignalArgs 

type SignalArgs struct {
	// CID is the container ID.
	CID string

	// Signo is the signal to send to the process.
	Signo int32

	// PID is the process ID in the given container that will be signaled,
	// relative to the root PID namespace, not the container's.
	// If 0, the root container will be signalled.
	PID int32

	// Mode is the signal delivery mode.
	Mode SignalDeliveryMode
}

SignalArgs are arguments to the Signal method.

type SignalDeliveryMode 

type SignalDeliveryMode int

SignalDeliveryMode enumerates different signal delivery modes. 

const (
	// DeliverToProcess delivers the signal to the container process with
	// the specified PID. If PID is 0, then the container init process is
	// signaled.
	DeliverToProcess SignalDeliveryMode = iota

	// DeliverToAllProcesses delivers the signal to all processes in the
	// container. PID must be 0.
	DeliverToAllProcesses

	// DeliverToForegroundProcessGroup delivers the signal to the
	// foreground process group in the same TTY session as the specified
	// process. If PID is 0, then the signal is delivered to the foreground
	// process group for the TTY for the init process.
	DeliverToForegroundProcessGroup
)

func (SignalDeliveryMode) String 

func (s SignalDeliveryMode) String() string

type StartArgs 

type StartArgs struct {
	// Spec is the spec of the container to start.
	Spec *specs.Spec

	// Config is the runsc-specific configuration for the sandbox.
	Conf *config.Config

	// CID is the ID of the container to start.
	CID string

	// FilePayload contains, in order:
	//   * stdin, stdout, and stderr (optional: if terminal is disabled).
	//   * file descriptors to connect to gofer to serve the root filesystem.
	urpc.FilePayload
}

StartArgs contains arguments to the Start method.

type Stats 

type Stats struct {
	CPU    CPU    `json:"cpu"`
	Memory Memory `json:"memory"`
	Pids   Pids   `json:"pids"`
}

Stats is the runc specific stats structure for stability when encoding and decoding stats.

type WaitPIDArgs 

type WaitPIDArgs struct {
	// PID is the PID in the container's PID namespace.
	PID int32

	// CID is the container ID.
	CID string
}

WaitPIDArgs are arguments to the WaitPID method.

Source Files

View all Source files

Directories

Path Synopsis
Package filter defines all syscalls the sandbox is allowed to make to the host, and installs seccomp filters to prevent prohibited syscalls in case it's compromised.
 Package filter defines all syscalls the sandbox is allowed to make to the host, and installs seccomp filters to prevent prohibited syscalls in case it's compromised.
Package platforms imports all available platform packages.
 Package platforms imports all available platform packages.
Package pprof provides a stub to initialize custom profilers.
 Package pprof provides a stub to initialize custom profilers.

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