394 lines
10 KiB
Go
394 lines
10 KiB
Go
package docker
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import (
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"container/list"
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"fmt"
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"github.com/dotcloud/docker/auth"
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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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type Capabilities struct {
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MemoryLimit bool
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SwapLimit bool
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}
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type Runtime struct {
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root string
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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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authConfig *auth.AuthConfig
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idIndex *TruncIndex
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capabilities *Capabilities
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kernelVersion *KernelVersionInfo
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}
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var sysInitPath string
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func init() {
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sysInitPath = SelfPath()
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}
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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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func (runtime *Runtime) Get(name string) *Container {
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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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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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func (runtime *Runtime) Create(config *Config) (*Container, 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, err
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}
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// Generate id
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id := GenerateId()
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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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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: config.Cmd[0],
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Args: config.Cmd[1:], //FIXME: de-duplicate from config
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Config: config,
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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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}
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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, err
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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 {
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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, err
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}
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defer f.Close()
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for _, dns := range config.Dns {
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if _, err := f.Write([]byte("nameserver " + dns + "\n")); err != nil {
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return 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, err
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}
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// Step 3: register the container
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if err := runtime.Register(container); err != nil {
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return nil, err
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}
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return container, nil
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}
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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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if err := runtime.Register(container); err != nil {
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return nil, err
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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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// init the wait lock
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container.waitLock = make(chan struct{})
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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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if output, err := exec.Command("lxc-info", "-n", container.Id).CombinedOutput(); err != nil {
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return err
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} else {
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if !strings.Contains(string(output), "RUNNING") {
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Debugf("Container %s was supposed to be running be is not.", container.Id)
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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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}
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// Even if not running, we init the lock (prevents races in start/stop/kill)
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container.State.initLock()
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container.runtime = runtime
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// Attach to stdout and stderr
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container.stderr = newWriteBroadcaster()
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container.stdout = 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 = 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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return nil
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}
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func (runtime *Runtime) LogToDisk(src *writeBroadcaster, dst 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)
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return nil
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}
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func (runtime *Runtime) Destroy(container *Container) error {
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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(10); err != nil {
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return err
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}
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if mounted, err := container.Mounted(); err != nil {
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return err
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} else if mounted {
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if err := container.Unmount(); err != nil {
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return fmt.Errorf("Unable to unmount container %v: %v", container.Id, err)
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}
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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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// Commit creates a new filesystem image from the current state of a container.
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// The image can optionally be tagged into a repository
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func (runtime *Runtime) Commit(id, repository, tag, comment, author string) (*Image, error) {
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container := runtime.Get(id)
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if container == nil {
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return nil, fmt.Errorf("No such container: %s", id)
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}
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// FIXME: freeze the container before copying it to avoid data corruption?
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// FIXME: this shouldn't be in commands.
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rwTar, err := container.ExportRw()
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if err != nil {
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return nil, err
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}
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// Create a new image from the container's base layers + a new layer from container changes
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img, err := runtime.graph.Create(rwTar, container, comment, author)
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if err != nil {
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return nil, err
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}
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// Register the image if needed
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if repository != "" {
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if err := runtime.repositories.Set(repository, tag, img.Id, true); err != nil {
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return img, err
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}
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}
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return img, nil
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}
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func (runtime *Runtime) restore() error {
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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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for _, v := range dir {
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id := v.Name()
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container, err := runtime.Load(id)
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if err != nil {
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Debugf("Failed to load container %v: %v", id, err)
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continue
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}
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Debugf("Loaded container %v", container.Id)
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}
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return nil
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}
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// FIXME: harmonize with NewGraph()
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func NewRuntime() (*Runtime, error) {
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runtime, err := NewRuntimeFromDirectory("/var/lib/docker")
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if err != nil {
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return nil, err
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}
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k, err := GetKernelVersion()
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if err != nil {
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return nil, err
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}
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runtime.kernelVersion = k
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if CompareKernelVersion(k, &KernelVersionInfo{Kernel: 3, Major: 8, Minor: 0}) < 0 {
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log.Printf("WARNING: You are running linux kernel version %s, which might be unstable running docker. Please upgrade your kernel to 3.8.0.", k.String())
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}
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if cgroupMemoryMountpoint, err := FindCgroupMountpoint("memory"); err != nil {
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log.Printf("WARNING: %s\n", err)
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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 {
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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 {
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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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return runtime, nil
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}
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func NewRuntimeFromDirectory(root string) (*Runtime, error) {
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runtimeRepo := path.Join(root, "containers")
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if err := os.MkdirAll(runtimeRepo, 0700); err != nil && !os.IsExist(err) {
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return nil, err
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}
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g, err := NewGraph(path.Join(root, "graph"))
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if err != nil {
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return nil, err
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}
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repositories, err := NewTagStore(path.Join(root, "repositories"), g)
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if err != nil {
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return nil, fmt.Errorf("Couldn't create Tag store: %s", err)
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}
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if NetworkBridgeIface == "" {
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NetworkBridgeIface = DefaultNetworkBridge
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}
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netManager, err := newNetworkManager(NetworkBridgeIface)
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if err != nil {
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return nil, err
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}
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authConfig, err := auth.LoadConfig(root)
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if err != nil && authConfig == nil {
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// If the auth file does not exist, keep going
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return nil, err
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}
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runtime := &Runtime{
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root: root,
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repository: runtimeRepo,
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containers: list.New(),
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networkManager: netManager,
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graph: g,
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repositories: repositories,
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authConfig: authConfig,
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idIndex: NewTruncIndex(),
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capabilities: &Capabilities{},
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}
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if err := runtime.restore(); err != nil {
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return nil, err
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}
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return runtime, nil
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}
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type History []*Container
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func (history *History) Len() int {
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return len(*history)
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}
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func (history *History) Less(i, j int) bool {
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containers := *history
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return containers[j].When().Before(containers[i].When())
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}
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func (history *History) Swap(i, j int) {
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containers := *history
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tmp := containers[i]
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containers[i] = containers[j]
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containers[j] = tmp
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}
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func (history *History) Add(container *Container) {
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*history = append(*history, container)
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sort.Sort(history)
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}
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