docker

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README

Docker: the Linux container engine

Docker is an open source project to pack, ship and run any application as a lightweight container

Docker containers are both hardware-agnostic and platform-agnostic. This means that they can run anywhere, from your laptop to the largest EC2 compute instance and everything in between - and they don't require that you use a particular language, framework or packaging system. That makes them great building blocks for deploying and scaling web apps, databases and backend services without depending on a particular stack or provider.

Docker is an open-source implementation of the deployment engine which powers dotCloud, a popular Platform-as-a-Service. It benefits directly from the experience accumulated over several years of large-scale operation and support of hundreds of thousands of applications and databases.

Docker L

Better than VMs

A common method for distributing applications and sandbox their execution is to use virtual machines, or VMs. Typical VM formats are VMWare's vmdk, Oracle Virtualbox's vdi, and Amazon EC2's ami. In theory these formats should allow every developer to automatically package their application into a "machine" for easy distribution and deployment. In practice, that almost never happens, for a few reasons:

  • Size: VMs are very large which makes them impractical to store and transfer.
  • Performance: running VMs consumes significant CPU and memory, which makes them impractical in many scenarios, for example local development of multi-tier applications, and large-scale deployment of cpu and memory-intensive applications on large numbers of machines.
  • Portability: competing VM environments don't play well with each other. Although conversion tools do exist, they are limited and add even more overhead.
  • Hardware-centric: VMs were designed with machine operators in mind, not software developers. As a result, they offer very limited tooling for what developers need most: building, testing and running their software. For example, VMs offer no facilities for application versioning, monitoring, configuration, logging or service discovery.

By contrast, Docker relies on a different sandboxing method known as containerization. Unlike traditional virtualization, containerization takes place at the kernel level. Most modern operating system kernels now support the primitives necessary for containerization, including Linux with openvz, vserver and more recently lxc, Solaris with zones and FreeBSD with Jails.

Docker builds on top of these low-level primitives to offer developers a portable format and runtime environment that solves all 4 problems. Docker containers are small (and their transfer can be optimized with layers), they have basically zero memory and cpu overhead, they are completely portable and are designed from the ground up with an application-centric design.

The best part: because docker operates at the OS level, it can still be run inside a VM!

Plays well with others

Docker does not require that you buy into a particular programming language, framework, packaging system or configuration language.

Is your application a Unix process? Does it use files, tcp connections, environment variables, standard Unix streams and command-line arguments as inputs and outputs? Then docker can run it.

Can your application's build be expressed as a sequence of such commands? Then docker can build it.

Escape dependency hell

A common problem for developers is the difficulty of managing all their application's dependencies in a simple and automated way.

This is usually difficult for several reasons:

  • Cross-platform dependencies. Modern applications often depend on a combination of system libraries and binaries, language-specific packages, framework-specific modules, internal components developed for another project, etc. These dependencies live in different "worlds" and require different tools - these tools typically don't work well with each other, requiring awkward custom integrations.

  • Conflicting dependencies. Different applications may depend on different versions of the same dependency. Packaging tools handle these situations with various degrees of ease - but they all handle them in different and incompatible ways, which again forces the developer to do extra work.

  • Custom dependencies. A developer may need to prepare a custom version of their application's dependency. Some packaging systems can handle custom versions of a dependency, others can't - and all of them handle it differently.

Docker solves dependency hell by giving the developer a simple way to express all their application's dependencies in one place, and streamline the process of assembling them. If this makes you think of XKCD 927, don't worry. Docker doesn't replace your favorite packaging systems. It simply orchestrates their use in a simple and repeatable way. How does it do that? With layers.

Docker defines a build as running a sequence of Unix commands, one after the other, in the same container. Build commands modify the contents of the container (usually by installing new files on the filesystem), the next command modifies it some more, etc. Since each build command inherits the result of the previous commands, the order in which the commands are executed expresses dependencies.

Here's a typical Docker build process:

from ubuntu:12.10
run apt-get update
run DEBIAN_FRONTEND=noninteractive apt-get install -q -y python
run DEBIAN_FRONTEND=noninteractive apt-get install -q -y python-pip
run pip install django
run DEBIAN_FRONTEND=noninteractive apt-get install -q -y curl
run curl -L https://github.com/shykes/helloflask/archive/master.tar.gz | tar -xzv
run cd helloflask-master && pip install -r requirements.txt

Note that Docker doesn't care how dependencies are built - as long as they can be built by running a Unix command in a container.

Getting started

Docker can be installed on your local machine as well as servers - both bare metal and virtualized. It is available as a binary on most modern Linux systems, or as a VM on Windows, Mac and other systems.

We also offer an interactive tutorial for quickly learning the basics of using Docker.

For up-to-date install instructions and online tutorials, see the Getting Started page.

Usage examples

Docker can be used to run short-lived commands, long-running daemons (app servers, databases etc.), interactive shell sessions, etc.

You can find a list of real-world examples in the documentation.

Under the hood

Under the hood, Docker is built on the following components:

  • The cgroup and namespacing capabilities of the Linux kernel;
  • AUFS, a powerful union filesystem with copy-on-write capabilities;
  • The Go programming language;
  • lxc, a set of convenience scripts to simplify the creation of Linux containers.

Contributing to Docker

Want to hack on Docker? Awesome! There are instructions to get you started here.

They are probably not perfect, please let us know if anything feels wrong or incomplete.

Brought to you courtesy of our legal counsel. For more context, please see the Notice document.

Transfers of Docker shall be in accordance with applicable export controls of any country and all other applicable legal requirements. Docker shall not be distributed or downloaded to or in Cuba, Iran, North Korea, Sudan or Syria and shall not be distributed or downloaded to any person on the Denied Persons List administered by the U.S. Department of Commerce.

Documentation

Index

Constants

View Source 
const (
	APIVERSION        = 1.6
	DEFAULTHTTPHOST   = "127.0.0.1"
	DEFAULTHTTPPORT   = 4243
	DEFAULTUNIXSOCKET = "/var/run/docker.sock"
)
View Source 
const (
	ChangeModify = iota
	ChangeAdd
	ChangeDelete
)
View Source 
const (
	DefaultNetworkBridge = "docker0"
	DisableNetworkBridge = "none"
)
View Source 
const (
	UDPConnTrackTimeout = 90 * time.Second
	UDPBufSize          = 2048
)
View Source 
const DEFAULTTAG = "latest"
View Source 
const LxcHostConfigTemplate = `
{{if .LxcConf}}
{{range $pair := .LxcConf}}
{{$pair.Key}} = {{$pair.Value}}
{{end}}
{{end}}
`
View Source 
const LxcTemplate = `` /* 3992-byte string literal not displayed */

Variables

View Source 
var (
	GITCOMMIT string
	VERSION   string
)
View Source 
var (
	ErrConnectionRefused = errors.New("Can't connect to docker daemon. Is 'docker -d' running on this host?")
)
View Source 
var ErrImageReferenced = errors.New("Image referenced by a repository")
View Source 
var (
	ErrInvaidWorikingDirectory = errors.New("The working directory is invalid. It needs to be an absolute path.")
)
View Source 
var LxcHostConfigTemplateCompiled *template.Template
View Source 
var LxcTemplateCompiled *template.Template
View Source 
var NetworkBridgeIface string

Functions

func CmdStream 

func CmdStream(cmd *exec.Cmd) (io.Reader, error)

CmdStream executes a command, and returns its stdout as a stream. If the command fails to run or doesn't complete successfully, an error will be returned, including anything written on stderr.

func CompareConfig added in v0.3.1 

func CompareConfig(a, b *Config) bool

Compare two Config struct. Do not compare the "Image" nor "Hostname" fields If OpenStdin is set, then it differs

func CopyFileWithTar added in v0.4.5 

func CopyFileWithTar(src, dst string) error

CopyFileWithTar emulates the behavior of the 'cp' command-line for a single file. It copies a regular file from path `src` to path `dst`, and preserves all its metadata.

If `dst` ends with a trailing slash '/', the final destination path will be `dst/base(src)`.

func CopyWithTar added in v0.4.1 

func CopyWithTar(src, dst string) error

CopyWithTar creates a tar archive of filesystem path `src`, and unpacks it at filesystem path `dst`. The archive is streamed directly with fixed buffering and no intermediary disk IO.

func CreateBridgeIface added in v0.1.4 

func CreateBridgeIface(ifaceName string) error

CreateBridgeIface creates a network bridge interface on the host system with the name `ifaceName`, and attempts to configure it with an address which doesn't conflict with any other interface on the host. If it can't find an address which doesn't conflict, it will return an error.

func GenerateID added in v0.4.1 

func GenerateID() string

func ListenAndServe added in v0.3.3 

func ListenAndServe(proto, addr string, srv *Server, logging bool) error

func MergeConfig added in v0.3.3 

func MergeConfig(userConf, imageConf *Config) error

func MountAUFS 

func MountAUFS(ro []string, rw string, target string) error

func Mounted 

func Mounted(mountpoint string) (bool, error)

func ParseCommands added in v0.3.3 

func ParseCommands(proto, addr string, args ...string) error

func ParseRun 

func ParseRun(args []string, capabilities *Capabilities) (*Config, *HostConfig, *flag.FlagSet, error)

func StoreImage 

func StoreImage(img *Image, jsonData []byte, layerData Archive, root string) error

func StoreSize added in v0.4.1 

func StoreSize(img *Image, root string) error

func Subcmd added in v0.3.3 

func Subcmd(name, signature, description string) *flag.FlagSet

func SysInit 

func SysInit()

Sys Init code This code is run INSIDE the container and is responsible for setting up the environment before running the actual process

func Tar 

func Tar(path string, compression Compression) (io.Reader, error)

Tar creates an archive from the directory at `path`, and returns it as a stream of bytes.

func TarFilter added in v0.4.3 

func TarFilter(path string, compression Compression, filter []string) (io.Reader, error)

Tar creates an archive from the directory at `path`, only including files whose relative paths are included in `filter`. If `filter` is nil, then all files are included.

func TarUntar added in v0.4.3 

func TarUntar(src string, filter []string, dst string) error

TarUntar is a convenience function which calls Tar and Untar, with the output of one piped into the other. If either Tar or Untar fails, TarUntar aborts and returns the error.

func Unmount 

func Unmount(target string) error

func Untar 

func Untar(archive io.Reader, path string) error

Untar reads a stream of bytes from `archive`, parses it as a tar archive, and unpacks it into the directory at `path`. The archive may be compressed with one of the following algorithms: 

identity (uncompressed), gzip, bzip2, xz.

FIXME: specify behavior when target path exists vs. doesn't exist.

func UntarPath added in v0.4.1 

func UntarPath(src, dst string) error

UntarPath is a convenience function which looks for an archive at filesystem path `src`, and unpacks it at `dst`.

func ValidateID added in v0.4.1 

func ValidateID(id string) error

Types

type APIAuth added in v0.4.1 

type APIAuth struct {
	Status string
}

type APIContainers added in v0.4.1 

type APIContainers struct {
	ID         string `json:"Id"`
	Image      string
	Command    string
	Created    int64
	Status     string
	Ports      []APIPort
	SizeRw     int64
	SizeRootFs int64
}

func (*APIContainers) ToLegacy added in v0.6.2 

func (self *APIContainers) ToLegacy() APIContainersOld

type APIContainersOld added in v0.6.2 

type APIContainersOld struct {
	ID         string `json:"Id"`
	Image      string
	Command    string
	Created    int64
	Status     string
	Ports      string
	SizeRw     int64
	SizeRootFs int64
}

type APICopy added in v0.6.0 

type APICopy struct {
	Resource string
	HostPath string
}

type APIHistory added in v0.4.1 

type APIHistory struct {
	ID        string   `json:"Id"`
	Tags      []string `json:",omitempty"`
	Created   int64
	CreatedBy string `json:",omitempty"`
}

type APIID added in v0.4.1 

type APIID struct {
	ID string `json:"Id"`
}

type APIImageConfig added in v0.4.1 

type APIImageConfig struct {
	ID string `json:"Id"`
	*Config
}

type APIImages added in v0.4.1 

type APIImages struct {
	Repository  string `json:",omitempty"`
	Tag         string `json:",omitempty"`
	ID          string `json:"Id"`
	Created     int64
	Size        int64
	VirtualSize int64
}

type APIInfo added in v0.4.1 

type APIInfo struct {
	Debug              bool
	Containers         int
	Images             int
	NFd                int    `json:",omitempty"`
	NGoroutines        int    `json:",omitempty"`
	MemoryLimit        bool   `json:",omitempty"`
	SwapLimit          bool   `json:",omitempty"`
	IPv4Forwarding     bool   `json:",omitempty"`
	LXCVersion         string `json:",omitempty"`
	NEventsListener    int    `json:",omitempty"`
	KernelVersion      string `json:",omitempty"`
	IndexServerAddress string `json:",omitempty"`
}

type APIPort added in v0.4.1 

type APIPort struct {
	PrivatePort int64
	PublicPort  int64
	Type        string
}

func (*APIPort) MarshalJSON added in v0.6.2 

func (port *APIPort) MarshalJSON() ([]byte, error)

type APIRmi added in v0.4.1 

type APIRmi struct {
	Deleted  string `json:",omitempty"`
	Untagged string `json:",omitempty"`
}

type APIRun added in v0.4.1 

type APIRun struct {
	ID       string   `json:"Id"`
	Warnings []string `json:",omitempty"`
}

type APISearch added in v0.4.1 

type APISearch struct {
	Name        string
	Description string
}

type APITop added in v0.5.0 

type APITop struct {
	Titles    []string
	Processes [][]string
}

type APIVersion added in v0.4.1 

type APIVersion struct {
	Version   string
	GitCommit string `json:",omitempty"`
	GoVersion string `json:",omitempty"`
}

type APIWait added in v0.4.1 

type APIWait struct {
	StatusCode int
}

type Archive 

type Archive io.Reader

type AttachOpts added in v0.1.2 

type AttachOpts map[string]bool

AttachOpts stores arguments to 'docker run -a', eg. which streams to attach to

func NewAttachOpts added in v0.1.2 

func NewAttachOpts() AttachOpts

func (AttachOpts) Get added in v0.1.2 

func (opts AttachOpts) Get(val string) bool

func (AttachOpts) Set added in v0.1.2 

func (opts AttachOpts) Set(val string) error

func (AttachOpts) String added in v0.1.2 

func (opts AttachOpts) String() string

type BindMap added in v0.4.7 

type BindMap struct {
	SrcPath string
	DstPath string
	Mode    string
}

type BuildFile added in v0.3.4 

type BuildFile interface {
	Build(io.Reader) (string, error)
	CmdFrom(string) error
	CmdRun(string) error
}

func NewBuildFile added in v0.3.4 

func NewBuildFile(srv *Server, out io.Writer, verbose, utilizeCache, rm bool) BuildFile

type Capabilities added in v0.1.8 

type Capabilities struct {
	MemoryLimit            bool
	SwapLimit              bool
	IPv4ForwardingDisabled bool
}

type Change 

type Change struct {
	Path string
	Kind ChangeType
}

func Changes 

func Changes(layers []string, rw string) ([]Change, error)

func (*Change) String 

func (change *Change) String() string

type ChangeType 

type ChangeType int

type Compression 

type Compression uint32
const (
	Uncompressed Compression = iota
	Bzip2
	Gzip
	Xz
)

func DetectCompression added in v0.4.3 

func DetectCompression(source []byte) Compression

func (*Compression) Extension added in v0.3.4 

func (compression *Compression) Extension() string

func (*Compression) Flag 

func (compression *Compression) Flag() string

type Config 

type Config struct {
	Hostname        string
	Domainname      string
	User            string
	Memory          int64 // Memory limit (in bytes)
	MemorySwap      int64 // Total memory usage (memory + swap); set `-1' to disable swap
	CpuShares       int64 // CPU shares (relative weight vs. other containers)
	AttachStdin     bool
	AttachStdout    bool
	AttachStderr    bool
	PortSpecs       []string
	Tty             bool // Attach standard streams to a tty, including stdin if it is not closed.
	OpenStdin       bool // Open stdin
	StdinOnce       bool // If true, close stdin after the 1 attached client disconnects.
	Env             []string
	Cmd             []string
	Dns             []string
	Image           string // Name of the image as it was passed by the operator (eg. could be symbolic)
	Volumes         map[string]struct{}
	VolumesFrom     string
	WorkingDir      string
	Entrypoint      []string
	NetworkDisabled bool
	Privileged      bool
}

type Container 

type Container struct {
	ID string

	Created time.Time

	Path string
	Args []string

	Config *Config
	State  State
	Image  string

	NetworkSettings *NetworkSettings

	SysInitPath    string
	ResolvConfPath string
	HostnamePath   string
	HostsPath      string

	Volumes map[string]string
	// Store rw/ro in a separate structure to preserve reverse-compatibility on-disk.
	// Easier than migrating older container configs :)
	VolumesRW map[string]bool
	// contains filtered or unexported fields
}

func (*Container) Attach added in v0.1.2 

func (container *Container) Attach(stdin io.ReadCloser, stdinCloser io.Closer, stdout io.Writer, stderr io.Writer) chan error

func (*Container) Changes 

func (container *Container) Changes() ([]Change, error)

func (*Container) Cmd 

func (container *Container) Cmd() *exec.Cmd

func (*Container) Copy added in v0.6.0 

func (container *Container) Copy(resource string) (Archive, error)

func (*Container) EnsureMounted 

func (container *Container) EnsureMounted() error

func (*Container) Export 

func (container *Container) Export() (Archive, error)

func (*Container) ExportRw 

func (container *Container) ExportRw() (Archive, error)

func (*Container) FromDisk 

func (container *Container) FromDisk() error

func (*Container) GetImage 

func (container *Container) GetImage() (*Image, error)

func (*Container) GetSize added in v0.4.1 

func (container *Container) GetSize() (int64, int64)

GetSize, return real size, virtual size

func (*Container) Inject added in v0.3.1 

func (container *Container) Inject(file io.Reader, pth string) error

Inject the io.Reader at the given path. Note: do not close the reader

func (*Container) Kill 

func (container *Container) Kill() error

func (*Container) Mount 

func (container *Container) Mount() error

func (*Container) Mounted 

func (container *Container) Mounted() (bool, error)

func (*Container) Output 

func (container *Container) Output() (output []byte, err error)

func (*Container) ReadHostConfig added in v0.5.0 

func (container *Container) ReadHostConfig() (*HostConfig, error)

func (*Container) ReadLog 

func (container *Container) ReadLog(name string) (io.Reader, error)

func (*Container) Resize added in v0.3.4 

func (container *Container) Resize(h, w int) error

func (*Container) Restart 

func (container *Container) Restart(seconds int) error

func (*Container) RootfsPath 

func (container *Container) RootfsPath() string

This method must be exported to be used from the lxc template

func (*Container) Run 

func (container *Container) Run() error

func (*Container) RwChecksum added in v0.3.0 

func (container *Container) RwChecksum() (string, error)

func (*Container) SaveHostConfig added in v0.5.0 

func (container *Container) SaveHostConfig(hostConfig *HostConfig) (err error)

func (*Container) ShortID added in v0.4.1 

func (container *Container) ShortID() string

ShortID returns a shorthand version of the container's id for convenience. A collision with other container shorthands is very unlikely, but possible. In case of a collision a lookup with Runtime.Get() will fail, and the caller will need to use a langer prefix, or the full-length container Id.

func (*Container) Start 

func (container *Container) Start(hostConfig *HostConfig) (err error)

func (*Container) StderrPipe 

func (container *Container) StderrPipe() (io.ReadCloser, error)

func (*Container) StdinPipe 

func (container *Container) StdinPipe() (io.WriteCloser, error)

func (*Container) StdoutPipe 

func (container *Container) StdoutPipe() (io.ReadCloser, error)

func (*Container) Stop 

func (container *Container) Stop(seconds int) error

func (*Container) ToDisk 

func (container *Container) ToDisk() (err error)

func (*Container) Unmount 

func (container *Container) Unmount() error

func (*Container) Wait 

func (container *Container) Wait() int

Wait blocks until the container stops running, then returns its exit code.

func (*Container) WaitTimeout 

func (container *Container) WaitTimeout(timeout time.Duration) error

func (*Container) When 

func (container *Container) When() time.Time

type DockerCli added in v0.3.3 

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

func NewDockerCli added in v0.3.3 

func NewDockerCli(in io.ReadCloser, out, err io.Writer, proto, addr string) *DockerCli

func (*DockerCli) CmdAttach added in v0.3.3 

func (cli *DockerCli) CmdAttach(args ...string) error

func (*DockerCli) CmdBuild added in v0.3.3 

func (cli *DockerCli) CmdBuild(args ...string) error

func (*DockerCli) CmdCommit added in v0.3.3 

func (cli *DockerCli) CmdCommit(args ...string) error

func (*DockerCli) CmdCp added in v0.6.0 

func (cli *DockerCli) CmdCp(args ...string) error

func (*DockerCli) CmdDiff added in v0.3.3 

func (cli *DockerCli) CmdDiff(args ...string) error

func (*DockerCli) CmdEvents added in v0.5.1 

func (cli *DockerCli) CmdEvents(args ...string) error

func (*DockerCli) CmdExport added in v0.3.3 

func (cli *DockerCli) CmdExport(args ...string) error

func (*DockerCli) CmdHelp added in v0.3.3 

func (cli *DockerCli) CmdHelp(args ...string) error

func (*DockerCli) CmdHistory added in v0.3.3 

func (cli *DockerCli) CmdHistory(args ...string) error

func (*DockerCli) CmdImages added in v0.3.3 

func (cli *DockerCli) CmdImages(args ...string) error

func (*DockerCli) CmdImport added in v0.3.3 

func (cli *DockerCli) CmdImport(args ...string) error

func (*DockerCli) CmdInfo added in v0.3.3 

func (cli *DockerCli) CmdInfo(args ...string) error

'docker info': display system-wide information.

func (*DockerCli) CmdInsert added in v0.3.3 

func (cli *DockerCli) CmdInsert(args ...string) error

func (*DockerCli) CmdInspect added in v0.3.3 

func (cli *DockerCli) CmdInspect(args ...string) error

func (*DockerCli) CmdKill added in v0.3.3 

func (cli *DockerCli) CmdKill(args ...string) error

'docker kill NAME' kills a running container

func (*DockerCli) CmdLogin added in v0.3.3 

func (cli *DockerCli) CmdLogin(args ...string) error

'docker login': login / register a user to registry service.

func (*DockerCli) CmdLogs added in v0.3.3 

func (cli *DockerCli) CmdLogs(args ...string) error

func (*DockerCli) CmdPort added in v0.3.3 

func (cli *DockerCli) CmdPort(args ...string) error

func (*DockerCli) CmdPs added in v0.3.3 

func (cli *DockerCli) CmdPs(args ...string) error

func (*DockerCli) CmdPull added in v0.3.3 

func (cli *DockerCli) CmdPull(args ...string) error

func (*DockerCli) CmdPush added in v0.3.3 

func (cli *DockerCli) CmdPush(args ...string) error

func (*DockerCli) CmdRestart added in v0.3.3 

func (cli *DockerCli) CmdRestart(args ...string) error

func (*DockerCli) CmdRm added in v0.3.3 

func (cli *DockerCli) CmdRm(args ...string) error

func (*DockerCli) CmdRmi added in v0.3.3 

func (cli *DockerCli) CmdRmi(args ...string) error

'docker rmi IMAGE' removes all images with the name IMAGE

func (*DockerCli) CmdRun added in v0.3.3 

func (cli *DockerCli) CmdRun(args ...string) error

func (*DockerCli) CmdSearch added in v0.3.3 

func (cli *DockerCli) CmdSearch(args ...string) error

func (*DockerCli) CmdStart added in v0.3.3 

func (cli *DockerCli) CmdStart(args ...string) error

func (*DockerCli) CmdStop added in v0.3.3 

func (cli *DockerCli) CmdStop(args ...string) error

func (*DockerCli) CmdTag added in v0.3.3 

func (cli *DockerCli) CmdTag(args ...string) error

func (*DockerCli) CmdTop added in v0.5.0 

func (cli *DockerCli) CmdTop(args ...string) error

func (*DockerCli) CmdVersion added in v0.3.3 

func (cli *DockerCli) CmdVersion(args ...string) error

'docker version': show version information

func (*DockerCli) CmdWait added in v0.3.3 

func (cli *DockerCli) CmdWait(args ...string) error

'docker wait': block until a container stops

func (*DockerCli) LoadConfigFile added in v0.6.0 

func (cli *DockerCli) LoadConfigFile() (err error)

type Graph 

type Graph struct {
	Root string
	// contains filtered or unexported fields
}

A Graph is a store for versioned filesystem images and the relationship between them.

func NewGraph 

func NewGraph(root string) (*Graph, error)

NewGraph instantiates a new graph at the given root path in the filesystem. `root` will be created if it doesn't exist.

func (*Graph) ByParent 

func (graph *Graph) ByParent() (map[string][]*Image, error)

ByParent returns a lookup table of images by their parent. If an image of id ID has 3 children images, then the value for key ID will be a list of 3 images. If an image has no children, it will not have an entry in the table.

func (*Graph) Create 

func (graph *Graph) Create(layerData Archive, container *Container, comment, author string, config *Config) (*Image, error)

Create creates a new image and registers it in the graph.

func (*Graph) Delete 

func (graph *Graph) Delete(name string) error

Delete atomically removes an image from the graph.

func (*Graph) Exists 

func (graph *Graph) Exists(id string) bool

Exists returns true if an image is registered at the given id. If the image doesn't exist or if an error is encountered, false is returned.

func (*Graph) Get 

func (graph *Graph) Get(name string) (*Image, error)

Get returns the image with the given id, or an error if the image doesn't exist.

func (*Graph) Heads 

func (graph *Graph) Heads() (map[string]*Image, error)

Heads returns all heads in the graph, keyed by id. A head is an image which is not the parent of another image in the graph.

func (*Graph) IsNotExist added in v0.1.1 

func (graph *Graph) IsNotExist(err error) bool

FIXME: Implement error subclass instead of looking at the error text Note: This is the way golang implements os.IsNotExists on Plan9

func (*Graph) Map 

func (graph *Graph) Map() (map[string]*Image, error)

Map returns a list of all images in the graph, addressable by ID.

func (*Graph) Mktemp 

func (graph *Graph) Mktemp(id string) (string, error)

Mktemp creates a temporary sub-directory inside the graph's filesystem.

func (*Graph) Register 

func (graph *Graph) Register(jsonData []byte, layerData Archive, img *Image) error

Register imports a pre-existing image into the graph. FIXME: pass img as first argument

func (*Graph) TempLayerArchive added in v0.1.8 

func (graph *Graph) TempLayerArchive(id string, compression Compression, sf *utils.StreamFormatter, output io.Writer) (*TempArchive, error)

TempLayerArchive creates a temporary archive of the given image's filesystem layer. 

The archive is stored on disk and will be automatically deleted as soon as has been read.
If output is not nil, a human-readable progress bar will be written to it.
FIXME: does this belong in Graph? How about MktempFile, let the caller use it for archives?

type History 

type History []*Container

History is a convenience type for storing a list of containers, ordered by creation date.

func (*History) Add 

func (history *History) Add(container *Container)

func (*History) Len 

func (history *History) Len() int

func (*History) Less 

func (history *History) Less(i, j int) bool

func (*History) Swap 

func (history *History) Swap(i, j int)

type HostConfig added in v0.4.7 

type HostConfig struct {
	Binds           []string
	ContainerIDFile string
	LxcConf         []KeyValuePair
}

type HttpApiFunc added in v0.6.0 

type HttpApiFunc func(srv *Server, version float64, w http.ResponseWriter, r *http.Request, vars map[string]string) error

type IPAllocator 

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

IP allocator: Automatically allocate and release networking ports

func (*IPAllocator) Acquire 

func (alloc *IPAllocator) Acquire() (net.IP, error)

func (*IPAllocator) Close added in v0.6.4 

func (alloc *IPAllocator) Close() error

func (*IPAllocator) Release 

func (alloc *IPAllocator) Release(ip net.IP)

type Image 

type Image struct {
	ID              string    `json:"id"`
	Parent          string    `json:"parent,omitempty"`
	Comment         string    `json:"comment,omitempty"`
	Created         time.Time `json:"created"`
	Container       string    `json:"container,omitempty"`
	ContainerConfig Config    `json:"container_config,omitempty"`
	DockerVersion   string    `json:"docker_version,omitempty"`
	Author          string    `json:"author,omitempty"`
	Config          *Config   `json:"config,omitempty"`
	Architecture    string    `json:"architecture,omitempty"`

	Size int64
	// contains filtered or unexported fields
}

func LoadImage 

func LoadImage(root string) (*Image, error)

func NewImgJSON added in v0.4.1 

func NewImgJSON(src []byte) (*Image, error)

Build an Image object from raw json data

func (*Image) Changes 

func (image *Image) Changes(rw string) ([]Change, error)

func (*Image) GetParent 

func (img *Image) GetParent() (*Image, error)

func (*Image) History 

func (img *Image) History() ([]*Image, error)

Image includes convenience proxy functions to its graph These functions will return an error if the image is not registered (ie. if image.graph == nil)

func (*Image) Mount 

func (image *Image) Mount(root, rw string) error

func (*Image) ShortID added in v0.4.1 

func (image *Image) ShortID() string

func (*Image) TarLayer added in v0.1.8 

func (image *Image) TarLayer(compression Compression) (Archive, error)

TarLayer returns a tar archive of the image's filesystem layer.

func (*Image) WalkHistory 

func (img *Image) WalkHistory(handler func(*Image) error) (err error)

type KeyValuePair added in v0.6.0 

type KeyValuePair struct {
	Key   string
	Value string
}

type ListOpts 

type ListOpts []string

ListOpts type

func (*ListOpts) Set 

func (opts *ListOpts) Set(value string) error

func (*ListOpts) String 

func (opts *ListOpts) String() string

type Nat added in v0.1.3 

type Nat struct {
	Proto    string
	Frontend int
	Backend  int
}

type NetworkInterface 

type NetworkInterface struct {
	IPNet   net.IPNet
	Gateway net.IP
	// contains filtered or unexported fields
}

Network interface represents the networking stack of a container

func (*NetworkInterface) AllocatePort 

func (iface *NetworkInterface) AllocatePort(spec string) (*Nat, error)

Allocate an external TCP port and map it to the interface

func (*NetworkInterface) Release 

func (iface *NetworkInterface) Release()

Release: Network cleanup - release all resources

type NetworkManager 

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

Network Manager manages a set of network interfaces Only *one* manager per host machine should be used

func (*NetworkManager) Allocate 

func (manager *NetworkManager) Allocate() (*NetworkInterface, error)

Allocate a network interface

func (*NetworkManager) Close added in v0.6.4 

func (manager *NetworkManager) Close() error

type NetworkSettings 

type NetworkSettings struct {
	IPAddress   string
	IPPrefixLen int
	Gateway     string
	Bridge      string
	PortMapping map[string]PortMapping
}

func (*NetworkSettings) PortMappingAPI added in v0.6.2 

func (settings *NetworkSettings) PortMappingAPI() []APIPort

returns a more easy to process description of the port mapping defined in the settings

type PathOpts added in v0.2.2 

type PathOpts map[string]struct{}

PathOpts stores a unique set of absolute paths

func NewPathOpts added in v0.2.2 

func NewPathOpts() PathOpts

func (PathOpts) Set added in v0.2.2 

func (opts PathOpts) Set(val string) error

func (PathOpts) String added in v0.2.2 

func (opts PathOpts) String() string

type PortAllocator 

type PortAllocator struct {
	sync.Mutex
	// contains filtered or unexported fields
}

Port allocator: Automatically allocate and release networking ports

func (*PortAllocator) Acquire 

func (alloc *PortAllocator) Acquire(port int) (int, error)

func (*PortAllocator) Close added in v0.6.4 

func (alloc *PortAllocator) Close() error

func (*PortAllocator) Release 

func (alloc *PortAllocator) Release(port int) error

FIXME: Release can no longer fail, change its prototype to reflect that.

type PortMapper 

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

Port mapper takes care of mapping external ports to containers by setting up iptables rules. It keeps track of all mappings and is able to unmap at will

func (*PortMapper) Map 

func (mapper *PortMapper) Map(port int, backendAddr net.Addr) error

func (*PortMapper) Unmap 

func (mapper *PortMapper) Unmap(port int, proto string) error

type PortMapping added in v0.5.0 

type PortMapping map[string]string

type Proxy added in v0.5.0 

type Proxy interface {
	// Start forwarding traffic back and forth the front and back-end
	// addresses.
	Run()
	// Stop forwarding traffic and close both ends of the Proxy.
	Close()
	// Return the address on which the proxy is listening.
	FrontendAddr() net.Addr
	// Return the proxied address.
	BackendAddr() net.Addr
}

func NewProxy added in v0.5.0 

func NewProxy(frontendAddr, backendAddr net.Addr) (Proxy, error)

type Repository 

type Repository map[string]string

type Runtime 

type Runtime struct {
	Dns []string
	// contains filtered or unexported fields
}

func NewRuntime 

func NewRuntime(flGraphPath string, autoRestart bool, dns []string) (*Runtime, error)

FIXME: harmonize with NewGraph()

func NewRuntimeFromDirectory 

func NewRuntimeFromDirectory(root string, autoRestart bool) (*Runtime, error)

func (*Runtime) Commit 

func (runtime *Runtime) Commit(container *Container, repository, tag, comment, author string, config *Config) (*Image, error)

Commit creates a new filesystem image from the current state of a container. The image can optionally be tagged into a repository

func (*Runtime) Create 

func (runtime *Runtime) Create(config *Config) (*Container, error)

Create creates a new container from the given configuration.

func (*Runtime) Destroy 

func (runtime *Runtime) Destroy(container *Container) error

Destroy unregisters a container from the runtime and cleanly removes its contents from the filesystem.

func (*Runtime) Exists 

func (runtime *Runtime) Exists(id string) bool

Exists returns a true if a container of the specified ID or name exists, false otherwise.

func (*Runtime) Get 

func (runtime *Runtime) Get(name string) *Container

Get looks for a container by the specified ID or name, and returns it. If the container is not found, or if an error occurs, nil is returned.

func (*Runtime) List 

func (runtime *Runtime) List() []*Container

List returns an array of all containers registered in the runtime.

func (*Runtime) Load 

func (runtime *Runtime) Load(id string) (*Container, error)

Load reads the contents of a container from disk and registers it with Register. This is typically done at startup.

func (*Runtime) LogToDisk 

func (runtime *Runtime) LogToDisk(src *utils.WriteBroadcaster, dst, stream string) error

func (*Runtime) Register 

func (runtime *Runtime) Register(container *Container) error

Register makes a container object usable by the runtime as <container.ID>

func (*Runtime) UpdateCapabilities added in v0.2.2 

func (runtime *Runtime) UpdateCapabilities(quiet bool)

FIXME: comment please!

type Server 

type Server struct {
	sync.Mutex
	// contains filtered or unexported fields
}

func NewServer 

func NewServer(flGraphPath string, autoRestart, enableCors bool, dns ListOpts) (*Server, error)

func (*Server) ContainerAttach added in v0.3.3 

func (srv *Server) ContainerAttach(name string, logs, stream, stdin, stdout, stderr bool, inStream io.ReadCloser, outStream, errStream io.Writer) error

func (*Server) ContainerChanges added in v0.3.3 

func (srv *Server) ContainerChanges(name string) ([]Change, error)

func (*Server) ContainerCommit added in v0.3.3 

func (srv *Server) ContainerCommit(name, repo, tag, author, comment string, config *Config) (string, error)

func (*Server) ContainerCopy added in v0.6.0 

func (srv *Server) ContainerCopy(name string, resource string, out io.Writer) error

func (*Server) ContainerCreate added in v0.3.3 

func (srv *Server) ContainerCreate(config *Config) (string, error)

func (*Server) ContainerDestroy added in v0.3.3 

func (srv *Server) ContainerDestroy(name string, removeVolume bool) error

func (*Server) ContainerExport added in v0.3.3 

func (srv *Server) ContainerExport(name string, out io.Writer) error

func (*Server) ContainerInspect added in v0.3.3 

func (srv *Server) ContainerInspect(name string) (*Container, error)

func (*Server) ContainerKill added in v0.3.3 

func (srv *Server) ContainerKill(name string) error

func (*Server) ContainerResize added in v0.3.4 

func (srv *Server) ContainerResize(name string, h, w int) error

func (*Server) ContainerRestart added in v0.3.3 

func (srv *Server) ContainerRestart(name string, t int) error

func (*Server) ContainerStart added in v0.3.3 

func (srv *Server) ContainerStart(name string, hostConfig *HostConfig) error

func (*Server) ContainerStop added in v0.3.3 

func (srv *Server) ContainerStop(name string, t int) error

func (*Server) ContainerTag added in v0.3.3 

func (srv *Server) ContainerTag(name, repo, tag string, force bool) error

func (*Server) ContainerTop added in v0.5.0 

func (srv *Server) ContainerTop(name, ps_args string) (*APITop, error)

func (*Server) ContainerWait added in v0.3.3 

func (srv *Server) ContainerWait(name string) (int, error)

func (*Server) Containers added in v0.3.3 

func (srv *Server) Containers(all, size bool, n int, since, before string) []APIContainers

func (*Server) DockerInfo added in v0.3.3 

func (srv *Server) DockerInfo() *APIInfo

func (*Server) DockerVersion added in v0.3.3 

func (srv *Server) DockerVersion() APIVersion

func (*Server) HTTPRequestFactory added in v0.6.0 

func (srv *Server) HTTPRequestFactory(metaHeaders map[string][]string) *utils.HTTPRequestFactory

func (*Server) ImageDelete added in v0.3.3 

func (srv *Server) ImageDelete(name string, autoPrune bool) ([]APIRmi, error)

func (*Server) ImageGetCached added in v0.3.3 

func (srv *Server) ImageGetCached(imgID string, config *Config) (*Image, error)

func (*Server) ImageHistory added in v0.3.3 

func (srv *Server) ImageHistory(name string) ([]APIHistory, error)

func (*Server) ImageImport added in v0.3.3 

func (srv *Server) ImageImport(src, repo, tag string, in io.Reader, out io.Writer, sf *utils.StreamFormatter) error

func (*Server) ImageInsert added in v0.3.3 

func (srv *Server) ImageInsert(name, url, path string, out io.Writer, sf *utils.StreamFormatter) (string, error)

func (*Server) ImageInspect added in v0.3.3 

func (srv *Server) ImageInspect(name string) (*Image, error)

func (*Server) ImagePull added in v0.3.3 

func (srv *Server) ImagePull(localName string, tag string, out io.Writer, sf *utils.StreamFormatter, authConfig *auth.AuthConfig, metaHeaders map[string][]string, parallel bool) error

func (*Server) ImagePush added in v0.3.3 

func (srv *Server) ImagePush(localName string, out io.Writer, sf *utils.StreamFormatter, authConfig *auth.AuthConfig, metaHeaders map[string][]string) error

FIXME: Allow to interrupt current push when new push of same image is done.

func (*Server) Images added in v0.3.3 

func (srv *Server) Images(all bool, filter string) ([]APIImages, error)

func (*Server) ImagesSearch added in v0.3.3 

func (srv *Server) ImagesSearch(term string) ([]APISearch, error)

func (*Server) ImagesViz added in v0.3.3 

func (srv *Server) ImagesViz(out io.Writer) error

func (*Server) LogEvent added in v0.5.1 

func (srv *Server) LogEvent(action, id, from string)

type State 

type State struct {
	sync.Mutex
	Running    bool
	Pid        int
	ExitCode   int
	StartedAt  time.Time
	FinishedAt time.Time
	Ghost      bool
}

func (*State) String 

func (s *State) String() string

String returns a human-readable description of the state

type TCPProxy added in v0.5.0 

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

func NewTCPProxy added in v0.5.0 

func NewTCPProxy(frontendAddr, backendAddr *net.TCPAddr) (*TCPProxy, error)

func (*TCPProxy) BackendAddr added in v0.5.0 

func (proxy *TCPProxy) BackendAddr() net.Addr

func (*TCPProxy) Close added in v0.5.0 

func (proxy *TCPProxy) Close()

func (*TCPProxy) FrontendAddr added in v0.5.0 

func (proxy *TCPProxy) FrontendAddr() net.Addr

func (*TCPProxy) Run added in v0.5.0 

func (proxy *TCPProxy) Run()

type TagStore 

type TagStore struct {
	Repositories map[string]Repository
	// contains filtered or unexported fields
}

func NewTagStore 

func NewTagStore(path string, graph *Graph) (*TagStore, error)

func (*TagStore) ByID added in v0.4.1 

func (store *TagStore) ByID() map[string][]string

Return a reverse-lookup table of all the names which refer to each image Eg. {"43b5f19b10584": {"base:latest", "base:v1"}}

func (*TagStore) Delete added in v0.4.1 

func (store *TagStore) Delete(repoName, tag string) (bool, error)

func (*TagStore) DeleteAll added in v0.4.1 

func (store *TagStore) DeleteAll(id string) error

func (*TagStore) Get 

func (store *TagStore) Get(repoName string) (Repository, error)

func (*TagStore) GetImage 

func (store *TagStore) GetImage(repoName, tagOrID string) (*Image, error)

func (*TagStore) ImageName 

func (store *TagStore) ImageName(id string) string

func (*TagStore) LookupImage 

func (store *TagStore) LookupImage(name string) (*Image, error)

func (*TagStore) Reload 

func (store *TagStore) Reload() error

func (*TagStore) Save 

func (store *TagStore) Save() error

func (*TagStore) Set 

func (store *TagStore) Set(repoName, tag, imageName string, force bool) error

type TempArchive added in v0.1.8 

type TempArchive struct {
	*os.File
	Size int64 // Pre-computed from Stat().Size() as a convenience
}

func NewTempArchive added in v0.1.8 

func NewTempArchive(src Archive, dir string) (*TempArchive, error)

NewTempArchive reads the content of src into a temporary file, and returns the contents of that file as an archive. The archive can only be read once - as soon as reading completes, the file will be deleted.

func (*TempArchive) Read added in v0.1.8 

func (archive *TempArchive) Read(data []byte) (int, error)

type UDPProxy added in v0.5.0 

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

func NewUDPProxy added in v0.5.0 

func NewUDPProxy(frontendAddr, backendAddr *net.UDPAddr) (*UDPProxy, error)

func (*UDPProxy) BackendAddr added in v0.5.0 

func (proxy *UDPProxy) BackendAddr() net.Addr

func (*UDPProxy) Close added in v0.5.0 

func (proxy *UDPProxy) Close()

func (*UDPProxy) FrontendAddr added in v0.5.0 

func (proxy *UDPProxy) FrontendAddr() net.Addr

func (*UDPProxy) Run added in v0.5.0 

func (proxy *UDPProxy) Run()

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