780 lines
22 KiB
Go
780 lines
22 KiB
Go
package docker
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import (
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_ "code.google.com/p/gosqlite/sqlite3"
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"container/list"
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"database/sql"
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"fmt"
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"github.com/dotcloud/docker/archive"
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_ "github.com/dotcloud/docker/aufs"
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_ "github.com/dotcloud/docker/devmapper"
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"github.com/dotcloud/docker/gograph"
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"github.com/dotcloud/docker/graphdriver"
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_ "github.com/dotcloud/docker/graphdriver/dummy"
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"github.com/dotcloud/docker/utils"
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"io"
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"io/ioutil"
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"log"
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"os"
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"os/exec"
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"path"
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"sort"
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"strings"
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"time"
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)
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var defaultDns = []string{"8.8.8.8", "8.8.4.4"}
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type Capabilities struct {
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MemoryLimit bool
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SwapLimit bool
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IPv4ForwardingDisabled bool
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AppArmor bool
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}
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type Runtime struct {
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repository string
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containers *list.List
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networkManager *NetworkManager
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graph *Graph
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repositories *TagStore
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idIndex *utils.TruncIndex
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capabilities *Capabilities
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volumes *Graph
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srv *Server
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config *DaemonConfig
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containerGraph *gograph.Database
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driver graphdriver.Driver
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}
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// List returns an array of all containers registered in the runtime.
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func (runtime *Runtime) List() []*Container {
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containers := new(History)
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for e := runtime.containers.Front(); e != nil; e = e.Next() {
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containers.Add(e.Value.(*Container))
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}
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return *containers
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}
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func (runtime *Runtime) getContainerElement(id string) *list.Element {
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for e := runtime.containers.Front(); e != nil; e = e.Next() {
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container := e.Value.(*Container)
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if container.ID == id {
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return e
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}
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}
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return nil
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}
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// Get looks for a container by the specified ID or name, and returns it.
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// If the container is not found, or if an error occurs, nil is returned.
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func (runtime *Runtime) Get(name string) *Container {
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if c, _ := runtime.GetByName(name); c != nil {
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return c
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}
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id, err := runtime.idIndex.Get(name)
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if err != nil {
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return nil
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}
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e := runtime.getContainerElement(id)
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if e == nil {
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return nil
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}
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return e.Value.(*Container)
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}
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// Exists returns a true if a container of the specified ID or name exists,
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// false otherwise.
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func (runtime *Runtime) Exists(id string) bool {
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return runtime.Get(id) != nil
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}
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func (runtime *Runtime) containerRoot(id string) string {
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return path.Join(runtime.repository, id)
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}
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// Load reads the contents of a container from disk
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// This is typically done at startup.
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func (runtime *Runtime) load(id string) (*Container, error) {
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container := &Container{root: runtime.containerRoot(id)}
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if err := container.FromDisk(); err != nil {
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return nil, err
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}
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if container.ID != id {
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return container, fmt.Errorf("Container %s is stored at %s", container.ID, id)
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}
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if container.State.Running {
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container.State.Ghost = true
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}
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return container, nil
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}
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// Register makes a container object usable by the runtime as <container.ID>
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func (runtime *Runtime) Register(container *Container) error {
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if container.runtime != nil || runtime.Exists(container.ID) {
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return fmt.Errorf("Container is already loaded")
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}
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if err := validateID(container.ID); err != nil {
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return err
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}
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if err := runtime.ensureName(container); err != nil {
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return err
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}
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// Get the root filesystem from the driver
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rootfs, err := runtime.driver.Get(container.ID)
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if err != nil {
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return fmt.Errorf("Error getting container filesystem %s from driver %s: %s", container.ID, runtime.driver, err)
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}
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container.rootfs = rootfs
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// init the wait lock
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container.waitLock = make(chan struct{})
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container.runtime = runtime
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// Attach to stdout and stderr
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container.stderr = utils.NewWriteBroadcaster()
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container.stdout = utils.NewWriteBroadcaster()
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// Attach to stdin
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if container.Config.OpenStdin {
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container.stdin, container.stdinPipe = io.Pipe()
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} else {
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container.stdinPipe = utils.NopWriteCloser(ioutil.Discard) // Silently drop stdin
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}
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// done
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runtime.containers.PushBack(container)
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runtime.idIndex.Add(container.ID)
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// When we actually restart, Start() do the monitoring.
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// However, when we simply 'reattach', we have to restart a monitor
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nomonitor := false
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// FIXME: if the container is supposed to be running but is not, auto restart it?
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// if so, then we need to restart monitor and init a new lock
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// If the container is supposed to be running, make sure of it
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if container.State.Running {
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output, err := exec.Command("lxc-info", "-n", container.ID).CombinedOutput()
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if err != nil {
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return err
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}
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if !strings.Contains(string(output), "RUNNING") {
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utils.Debugf("Container %s was supposed to be running be is not.", container.ID)
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if runtime.config.AutoRestart {
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utils.Debugf("Restarting")
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container.State.Ghost = false
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container.State.setStopped(0)
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if err := container.Start(); err != nil {
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return err
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}
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nomonitor = true
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} else {
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utils.Debugf("Marking as stopped")
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container.State.setStopped(-127)
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if err := container.ToDisk(); err != nil {
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return err
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}
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}
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}
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}
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// If the container is not running or just has been flagged not running
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// then close the wait lock chan (will be reset upon start)
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if !container.State.Running {
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close(container.waitLock)
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} else if !nomonitor {
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go container.monitor()
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}
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return nil
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}
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func (runtime *Runtime) ensureName(container *Container) error {
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if container.Name == "" {
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name, err := generateRandomName(runtime)
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if err != nil {
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name = container.ShortID()
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}
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container.Name = name
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if err := container.ToDisk(); err != nil {
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utils.Debugf("Error saving container name %s", err)
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}
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if !runtime.containerGraph.Exists(name) {
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if _, err := runtime.containerGraph.Set(name, container.ID); err != nil {
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utils.Debugf("Setting default id - %s", err)
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}
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}
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}
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return nil
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}
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func (runtime *Runtime) LogToDisk(src *utils.WriteBroadcaster, dst, stream string) error {
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log, err := os.OpenFile(dst, os.O_RDWR|os.O_APPEND|os.O_CREATE, 0600)
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if err != nil {
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return err
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}
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src.AddWriter(log, stream)
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return nil
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}
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// Destroy unregisters a container from the runtime and cleanly removes its contents from the filesystem.
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func (runtime *Runtime) Destroy(container *Container) error {
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if container == nil {
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return fmt.Errorf("The given container is <nil>")
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}
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element := runtime.getContainerElement(container.ID)
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if element == nil {
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return fmt.Errorf("Container %v not found - maybe it was already destroyed?", container.ID)
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}
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if err := container.Stop(3); err != nil {
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return err
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}
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if err := runtime.driver.Remove(container.ID); err != nil {
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return fmt.Errorf("Driver %s failed to remove root filesystem %s: %s", runtime.driver, container.ID, err)
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}
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if _, err := runtime.containerGraph.Purge(container.ID); err != nil {
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utils.Debugf("Unable to remove container from link graph: %s", err)
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}
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// Deregister the container before removing its directory, to avoid race conditions
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runtime.idIndex.Delete(container.ID)
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runtime.containers.Remove(element)
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if err := os.RemoveAll(container.root); err != nil {
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return fmt.Errorf("Unable to remove filesystem for %v: %v", container.ID, err)
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}
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return nil
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}
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func (runtime *Runtime) restore() error {
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wheel := "-\\|/"
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if os.Getenv("DEBUG") == "" && os.Getenv("TEST") == "" {
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fmt.Printf("Loading containers: ")
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}
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dir, err := ioutil.ReadDir(runtime.repository)
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if err != nil {
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return err
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}
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containers := make(map[string]*Container)
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for i, v := range dir {
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id := v.Name()
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container, err := runtime.load(id)
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if i%21 == 0 && os.Getenv("DEBUG") == "" && os.Getenv("TEST") == "" {
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fmt.Printf("\b%c", wheel[i%4])
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}
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if err != nil {
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utils.Errorf("Failed to load container %v: %v", id, err)
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continue
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}
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utils.Debugf("Loaded container %v", container.ID)
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containers[container.ID] = container
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}
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register := func(container *Container) {
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if err := runtime.Register(container); err != nil {
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utils.Debugf("Failed to register container %s: %s", container.ID, err)
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}
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}
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if entities := runtime.containerGraph.List("/", -1); entities != nil {
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for _, p := range entities.Paths() {
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e := entities[p]
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if container, ok := containers[e.ID()]; ok {
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register(container)
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delete(containers, e.ID())
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}
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}
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}
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// Any containers that are left over do not exist in the graph
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for _, container := range containers {
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// Try to set the default name for a container if it exists prior to links
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container.Name, err = generateRandomName(runtime)
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if err != nil {
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container.Name = container.ShortID()
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}
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if _, err := runtime.containerGraph.Set(container.Name, container.ID); err != nil {
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utils.Debugf("Setting default id - %s", err)
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}
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register(container)
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}
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if os.Getenv("DEBUG") == "" && os.Getenv("TEST") == "" {
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fmt.Printf("\bdone.\n")
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}
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return nil
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}
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// FIXME: comment please!
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func (runtime *Runtime) UpdateCapabilities(quiet bool) {
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if cgroupMemoryMountpoint, err := utils.FindCgroupMountpoint("memory"); err != nil {
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if !quiet {
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log.Printf("WARNING: %s\n", err)
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}
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} else {
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_, err1 := ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.limit_in_bytes"))
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_, err2 := ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.soft_limit_in_bytes"))
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runtime.capabilities.MemoryLimit = err1 == nil && err2 == nil
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if !runtime.capabilities.MemoryLimit && !quiet {
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log.Printf("WARNING: Your kernel does not support cgroup memory limit.")
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}
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_, err = ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.memsw.limit_in_bytes"))
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runtime.capabilities.SwapLimit = err == nil
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if !runtime.capabilities.SwapLimit && !quiet {
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log.Printf("WARNING: Your kernel does not support cgroup swap limit.")
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}
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}
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content, err3 := ioutil.ReadFile("/proc/sys/net/ipv4/ip_forward")
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runtime.capabilities.IPv4ForwardingDisabled = err3 != nil || len(content) == 0 || content[0] != '1'
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if runtime.capabilities.IPv4ForwardingDisabled && !quiet {
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log.Printf("WARNING: IPv4 forwarding is disabled.")
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}
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// Check if AppArmor seems to be enabled on this system.
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if _, err := os.Stat("/sys/kernel/security/apparmor"); os.IsNotExist(err) {
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utils.Debugf("/sys/kernel/security/apparmor not found; assuming AppArmor is not enabled.")
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runtime.capabilities.AppArmor = false
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} else {
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utils.Debugf("/sys/kernel/security/apparmor found; assuming AppArmor is enabled.")
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runtime.capabilities.AppArmor = true
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}
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}
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// Create creates a new container from the given configuration with a given name.
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func (runtime *Runtime) Create(config *Config, name string) (*Container, []string, error) {
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// Lookup image
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img, err := runtime.repositories.LookupImage(config.Image)
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if err != nil {
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return nil, nil, err
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}
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checkDeprecatedExpose := func(config *Config) bool {
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if config != nil {
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if config.PortSpecs != nil {
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for _, p := range config.PortSpecs {
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if strings.Contains(p, ":") {
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return true
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}
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}
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}
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}
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return false
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}
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warnings := []string{}
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if checkDeprecatedExpose(img.Config) || checkDeprecatedExpose(config) {
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warnings = append(warnings, "The mapping to public ports on your host has been deprecated. Use -p to publish the ports.")
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}
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if img.Config != nil {
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if err := MergeConfig(config, img.Config); err != nil {
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return nil, nil, err
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}
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}
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if len(config.Entrypoint) != 0 && config.Cmd == nil {
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config.Cmd = []string{}
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} else if config.Cmd == nil || len(config.Cmd) == 0 {
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return nil, nil, fmt.Errorf("No command specified")
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}
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sysInitPath := utils.DockerInitPath()
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if sysInitPath == "" {
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return nil, nil, fmt.Errorf("Could not locate dockerinit: This usually means docker was built incorrectly. See http://docs.docker.io/en/latest/contributing/devenvironment for official build instructions.")
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}
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// Generate id
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id := GenerateID()
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if name == "" {
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name, err = generateRandomName(runtime)
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if err != nil {
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name = utils.TruncateID(id)
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}
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}
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if name[0] != '/' {
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name = "/" + name
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}
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// Set the enitity in the graph using the default name specified
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if _, err := runtime.containerGraph.Set(name, id); err != nil {
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if strings.HasSuffix(err.Error(), "name are not unique") {
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return nil, nil, fmt.Errorf("Conflict, %s already exists.", name)
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}
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return nil, nil, err
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}
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// Generate default hostname
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// FIXME: the lxc template no longer needs to set a default hostname
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if config.Hostname == "" {
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config.Hostname = id[:12]
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}
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var args []string
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var entrypoint string
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if len(config.Entrypoint) != 0 {
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entrypoint = config.Entrypoint[0]
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args = append(config.Entrypoint[1:], config.Cmd...)
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} else {
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entrypoint = config.Cmd[0]
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args = config.Cmd[1:]
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}
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container := &Container{
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// FIXME: we should generate the ID here instead of receiving it as an argument
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ID: id,
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Created: time.Now(),
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Path: entrypoint,
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Args: args, //FIXME: de-duplicate from config
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Config: config,
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hostConfig: &HostConfig{},
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Image: img.ID, // Always use the resolved image id
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NetworkSettings: &NetworkSettings{},
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// FIXME: do we need to store this in the container?
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SysInitPath: sysInitPath,
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Name: name,
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}
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container.root = runtime.containerRoot(container.ID)
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// Step 1: create the container directory.
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// This doubles as a barrier to avoid race conditions.
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if err := os.Mkdir(container.root, 0700); err != nil {
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return nil, nil, err
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}
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initID := fmt.Sprintf("%s-init", container.ID)
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if err := runtime.driver.Create(initID, img.ID); err != nil {
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return nil, nil, err
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}
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initPath, err := runtime.driver.Get(initID)
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if err != nil {
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return nil, nil, err
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}
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if err := setupInitLayer(initPath); err != nil {
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return nil, nil, err
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}
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if err := runtime.driver.Create(container.ID, initID); err != nil {
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return nil, nil, err
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}
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resolvConf, err := utils.GetResolvConf()
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if err != nil {
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return nil, nil, err
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}
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if len(config.Dns) == 0 && len(runtime.config.Dns) == 0 && utils.CheckLocalDns(resolvConf) {
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//"WARNING: Docker detected local DNS server on resolv.conf. Using default external servers: %v", defaultDns
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runtime.config.Dns = defaultDns
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}
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// If custom dns exists, then create a resolv.conf for the container
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if len(config.Dns) > 0 || len(runtime.config.Dns) > 0 {
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var dns []string
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if len(config.Dns) > 0 {
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dns = config.Dns
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} else {
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dns = runtime.config.Dns
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}
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container.ResolvConfPath = path.Join(container.root, "resolv.conf")
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f, err := os.Create(container.ResolvConfPath)
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if err != nil {
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return nil, nil, err
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}
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defer f.Close()
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for _, dns := range dns {
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if _, err := f.Write([]byte("nameserver " + dns + "\n")); err != nil {
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return nil, nil, err
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}
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}
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} else {
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container.ResolvConfPath = "/etc/resolv.conf"
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}
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// Step 2: save the container json
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if err := container.ToDisk(); err != nil {
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return nil, nil, err
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}
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// Step 3: if hostname, build hostname and hosts files
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container.HostnamePath = path.Join(container.root, "hostname")
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ioutil.WriteFile(container.HostnamePath, []byte(container.Config.Hostname+"\n"), 0644)
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hostsContent := []byte(`
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127.0.0.1 localhost
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::1 localhost ip6-localhost ip6-loopback
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fe00::0 ip6-localnet
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ff00::0 ip6-mcastprefix
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ff02::1 ip6-allnodes
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ff02::2 ip6-allrouters
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`)
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container.HostsPath = path.Join(container.root, "hosts")
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if container.Config.Domainname != "" {
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|
hostsContent = append([]byte(fmt.Sprintf("::1\t\t%s.%s %s\n", container.Config.Hostname, container.Config.Domainname, container.Config.Hostname)), hostsContent...)
|
|
hostsContent = append([]byte(fmt.Sprintf("127.0.0.1\t%s.%s %s\n", container.Config.Hostname, container.Config.Domainname, container.Config.Hostname)), hostsContent...)
|
|
} else {
|
|
hostsContent = append([]byte(fmt.Sprintf("::1\t\t%s\n", container.Config.Hostname)), hostsContent...)
|
|
hostsContent = append([]byte(fmt.Sprintf("127.0.0.1\t%s\n", container.Config.Hostname)), hostsContent...)
|
|
}
|
|
|
|
ioutil.WriteFile(container.HostsPath, hostsContent, 0644)
|
|
|
|
// Step 4: register the container
|
|
if err := runtime.Register(container); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
return container, warnings, nil
|
|
}
|
|
|
|
// Commit creates a new filesystem image from the current state of a container.
|
|
// The image can optionally be tagged into a repository
|
|
func (runtime *Runtime) Commit(container *Container, repository, tag, comment, author string, config *Config) (*Image, error) {
|
|
// FIXME: freeze the container before copying it to avoid data corruption?
|
|
// FIXME: this shouldn't be in commands.
|
|
if err := container.EnsureMounted(); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
rwTar, err := container.ExportRw()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
// Create a new image from the container's base layers + a new layer from container changes
|
|
img, err := runtime.graph.Create(rwTar, container, comment, author, config)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
// Register the image if needed
|
|
if repository != "" {
|
|
if err := runtime.repositories.Set(repository, tag, img.ID, true); err != nil {
|
|
return img, err
|
|
}
|
|
}
|
|
return img, nil
|
|
}
|
|
|
|
func (runtime *Runtime) getFullName(name string) (string, error) {
|
|
if name == "" {
|
|
return "", fmt.Errorf("Container name cannot be empty")
|
|
}
|
|
if name[0] != '/' {
|
|
name = "/" + name
|
|
}
|
|
return name, nil
|
|
}
|
|
|
|
func (runtime *Runtime) GetByName(name string) (*Container, error) {
|
|
fullName, err := runtime.getFullName(name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
entity := runtime.containerGraph.Get(fullName)
|
|
if entity == nil {
|
|
return nil, fmt.Errorf("Could not find entity for %s", name)
|
|
}
|
|
e := runtime.getContainerElement(entity.ID())
|
|
if e == nil {
|
|
return nil, fmt.Errorf("Could not find container for entity id %s", entity.ID())
|
|
}
|
|
return e.Value.(*Container), nil
|
|
}
|
|
|
|
func (runtime *Runtime) Children(name string) (map[string]*Container, error) {
|
|
name, err := runtime.getFullName(name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
children := make(map[string]*Container)
|
|
|
|
err = runtime.containerGraph.Walk(name, func(p string, e *gograph.Entity) error {
|
|
c := runtime.Get(e.ID())
|
|
if c == nil {
|
|
return fmt.Errorf("Could not get container for name %s and id %s", e.ID(), p)
|
|
}
|
|
children[p] = c
|
|
return nil
|
|
}, 0)
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return children, nil
|
|
}
|
|
|
|
func (runtime *Runtime) RegisterLink(parent, child *Container, alias string) error {
|
|
fullName := path.Join(parent.Name, alias)
|
|
if !runtime.containerGraph.Exists(fullName) {
|
|
_, err := runtime.containerGraph.Set(fullName, child.ID)
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// FIXME: harmonize with NewGraph()
|
|
func NewRuntime(config *DaemonConfig) (*Runtime, error) {
|
|
runtime, err := NewRuntimeFromDirectory(config)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
runtime.UpdateCapabilities(false)
|
|
return runtime, nil
|
|
}
|
|
|
|
func NewRuntimeFromDirectory(config *DaemonConfig) (*Runtime, error) {
|
|
// Load storage driver
|
|
driver, err := graphdriver.New(config.Root)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
utils.Debugf("Using graph driver %s", driver)
|
|
|
|
runtimeRepo := path.Join(config.Root, "containers")
|
|
|
|
if err := os.MkdirAll(runtimeRepo, 0700); err != nil && !os.IsExist(err) {
|
|
return nil, err
|
|
}
|
|
|
|
if err := linkLxcStart(config.Root); err != nil {
|
|
return nil, err
|
|
}
|
|
g, err := NewGraph(path.Join(config.Root, "graph"), driver)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
volumes, err := NewGraph(path.Join(config.Root, "volumes"), driver)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
repositories, err := NewTagStore(path.Join(config.Root, "repositories"), g)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("Couldn't create Tag store: %s", err)
|
|
}
|
|
if config.BridgeIface == "" {
|
|
config.BridgeIface = DefaultNetworkBridge
|
|
}
|
|
netManager, err := newNetworkManager(config)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
gographPath := path.Join(config.Root, "linkgraph.db")
|
|
initDatabase := false
|
|
if _, err := os.Stat(gographPath); err != nil {
|
|
if os.IsNotExist(err) {
|
|
initDatabase = true
|
|
} else {
|
|
return nil, err
|
|
}
|
|
}
|
|
conn, err := sql.Open("sqlite3", gographPath)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
graph, err := gograph.NewDatabase(conn, initDatabase)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
runtime := &Runtime{
|
|
repository: runtimeRepo,
|
|
containers: list.New(),
|
|
networkManager: netManager,
|
|
graph: g,
|
|
repositories: repositories,
|
|
idIndex: utils.NewTruncIndex(),
|
|
capabilities: &Capabilities{},
|
|
volumes: volumes,
|
|
config: config,
|
|
containerGraph: graph,
|
|
driver: driver,
|
|
}
|
|
|
|
if err := runtime.restore(); err != nil {
|
|
return nil, err
|
|
}
|
|
return runtime, nil
|
|
}
|
|
|
|
func (runtime *Runtime) Close() error {
|
|
runtime.networkManager.Close()
|
|
runtime.driver.Cleanup()
|
|
return runtime.containerGraph.Close()
|
|
}
|
|
|
|
func (runtime *Runtime) Mount(container *Container) error {
|
|
dir, err := runtime.driver.Get(container.ID)
|
|
if err != nil {
|
|
return fmt.Errorf("Error getting container %s from driver %s: %s", container.ID, runtime.driver, err)
|
|
}
|
|
if container.rootfs == "" {
|
|
container.rootfs = dir
|
|
} else if container.rootfs != dir {
|
|
return fmt.Errorf("Error: driver %s is returning inconsistent paths for container %s ('%s' then '%s')",
|
|
runtime.driver, container.ID, container.rootfs, dir)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (runtime *Runtime) Unmount(container *Container) error {
|
|
// FIXME: Unmount is deprecated because drivers are responsible for mounting
|
|
// and unmounting when necessary. Use driver.Remove() instead.
|
|
return nil
|
|
}
|
|
|
|
func (runtime *Runtime) Changes(container *Container) ([]archive.Change, error) {
|
|
return runtime.driver.Changes(container.ID)
|
|
}
|
|
|
|
func linkLxcStart(root string) error {
|
|
sourcePath, err := exec.LookPath("lxc-start")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
targetPath := path.Join(root, "lxc-start-unconfined")
|
|
|
|
if _, err := os.Stat(targetPath); err != nil && !os.IsNotExist(err) {
|
|
return err
|
|
} else if err == nil {
|
|
if err := os.Remove(targetPath); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return os.Symlink(sourcePath, targetPath)
|
|
}
|
|
|
|
// History is a convenience type for storing a list of containers,
|
|
// ordered by creation date.
|
|
type History []*Container
|
|
|
|
func (history *History) Len() int {
|
|
return len(*history)
|
|
}
|
|
|
|
func (history *History) Less(i, j int) bool {
|
|
containers := *history
|
|
return containers[j].When().Before(containers[i].When())
|
|
}
|
|
|
|
func (history *History) Swap(i, j int) {
|
|
containers := *history
|
|
tmp := containers[i]
|
|
containers[i] = containers[j]
|
|
containers[j] = tmp
|
|
}
|
|
|
|
func (history *History) Add(container *Container) {
|
|
*history = append(*history, container)
|
|
sort.Sort(history)
|
|
}
|