mirror of
https://github.com/moby/moby.git
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441 lines
10 KiB
Go
441 lines
10 KiB
Go
package libcontainerd
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import (
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"net"
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"os"
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"os/exec"
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"path/filepath"
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"strconv"
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"strings"
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"sync"
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"syscall"
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"time"
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"github.com/Sirupsen/logrus"
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containerd "github.com/docker/containerd/api/grpc/types"
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"github.com/docker/docker/pkg/locker"
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sysinfo "github.com/docker/docker/pkg/system"
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"github.com/docker/docker/utils"
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"golang.org/x/net/context"
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"google.golang.org/grpc"
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"google.golang.org/grpc/grpclog"
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)
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const (
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maxConnectionRetryCount = 3
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connectionRetryDelay = 3 * time.Second
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containerdShutdownTimeout = 15 * time.Second
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containerdBinary = "docker-containerd"
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containerdPidFilename = "docker-containerd.pid"
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containerdSockFilename = "docker-containerd.sock"
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eventTimestampFilename = "event.ts"
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)
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type remote struct {
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sync.RWMutex
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apiClient containerd.APIClient
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daemonPid int
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stateDir string
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rpcAddr string
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startDaemon bool
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debugLog bool
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rpcConn *grpc.ClientConn
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clients []*client
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eventTsPath string
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pastEvents map[string]*containerd.Event
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runtimeArgs []string
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}
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// New creates a fresh instance of libcontainerd remote.
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func New(stateDir string, options ...RemoteOption) (_ Remote, err error) {
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defer func() {
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if err != nil {
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err = fmt.Errorf("Failed to connect to containerd. Please make sure containerd is installed in your PATH or you have specificed the correct address. Got error: %v", err)
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}
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}()
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r := &remote{
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stateDir: stateDir,
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daemonPid: -1,
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eventTsPath: filepath.Join(stateDir, eventTimestampFilename),
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pastEvents: make(map[string]*containerd.Event),
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}
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for _, option := range options {
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if err := option.Apply(r); err != nil {
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return nil, err
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}
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}
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if err := sysinfo.MkdirAll(stateDir, 0700); err != nil {
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return nil, err
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}
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if r.rpcAddr == "" {
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r.rpcAddr = filepath.Join(stateDir, containerdSockFilename)
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}
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if r.startDaemon {
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if err := r.runContainerdDaemon(); err != nil {
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return nil, err
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}
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}
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// don't output the grpc reconnect logging
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grpclog.SetLogger(log.New(ioutil.Discard, "", log.LstdFlags))
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dialOpts := append([]grpc.DialOption{grpc.WithInsecure()},
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grpc.WithDialer(func(addr string, timeout time.Duration) (net.Conn, error) {
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return net.DialTimeout("unix", addr, timeout)
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}),
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)
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conn, err := grpc.Dial(r.rpcAddr, dialOpts...)
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if err != nil {
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return nil, fmt.Errorf("error connecting to containerd: %v", err)
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}
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r.rpcConn = conn
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r.apiClient = containerd.NewAPIClient(conn)
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go r.handleConnectionChange()
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if err := r.startEventsMonitor(); err != nil {
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return nil, err
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}
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return r, nil
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}
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func (r *remote) handleConnectionChange() {
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var transientFailureCount = 0
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state := grpc.Idle
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for {
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s, err := r.rpcConn.WaitForStateChange(context.Background(), state)
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if err != nil {
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break
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}
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state = s
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logrus.Debugf("containerd connection state change: %v", s)
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if r.daemonPid != -1 {
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switch state {
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case grpc.TransientFailure:
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// Reset state to be notified of next failure
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transientFailureCount++
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if transientFailureCount >= maxConnectionRetryCount {
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transientFailureCount = 0
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if utils.IsProcessAlive(r.daemonPid) {
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utils.KillProcess(r.daemonPid)
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}
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if err := r.runContainerdDaemon(); err != nil { //FIXME: Handle error
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logrus.Errorf("error restarting containerd: %v", err)
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}
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} else {
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state = grpc.Idle
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time.Sleep(connectionRetryDelay)
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}
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case grpc.Shutdown:
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// Well, we asked for it to stop, just return
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return
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}
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}
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}
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}
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func (r *remote) Cleanup() {
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if r.daemonPid == -1 {
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return
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}
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r.rpcConn.Close()
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// Ask the daemon to quit
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syscall.Kill(r.daemonPid, syscall.SIGTERM)
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// Wait up to 15secs for it to stop
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for i := time.Duration(0); i < containerdShutdownTimeout; i += time.Second {
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if !utils.IsProcessAlive(r.daemonPid) {
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break
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}
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time.Sleep(time.Second)
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}
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if utils.IsProcessAlive(r.daemonPid) {
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logrus.Warnf("libcontainerd: containerd (%d) didn't stop within 15 secs, killing it\n", r.daemonPid)
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syscall.Kill(r.daemonPid, syscall.SIGKILL)
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}
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// cleanup some files
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os.Remove(filepath.Join(r.stateDir, containerdPidFilename))
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os.Remove(filepath.Join(r.stateDir, containerdSockFilename))
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}
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func (r *remote) Client(b Backend) (Client, error) {
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c := &client{
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clientCommon: clientCommon{
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backend: b,
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containers: make(map[string]*container),
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locker: locker.New(),
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},
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remote: r,
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exitNotifiers: make(map[string]*exitNotifier),
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}
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r.Lock()
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r.clients = append(r.clients, c)
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r.Unlock()
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return c, nil
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}
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func (r *remote) updateEventTimestamp(t time.Time) {
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f, err := os.OpenFile(r.eventTsPath, syscall.O_CREAT|syscall.O_WRONLY|syscall.O_TRUNC, 0600)
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defer f.Close()
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if err != nil {
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logrus.Warnf("libcontainerd: failed to open event timestamp file: %v", err)
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return
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}
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b, err := t.MarshalText()
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if err != nil {
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logrus.Warnf("libcontainerd: failed to encode timestamp: %v", err)
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return
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}
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n, err := f.Write(b)
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if err != nil || n != len(b) {
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logrus.Warnf("libcontainerd: failed to update event timestamp file: %v", err)
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f.Truncate(0)
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return
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}
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}
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func (r *remote) getLastEventTimestamp() int64 {
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t := time.Now()
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fi, err := os.Stat(r.eventTsPath)
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if os.IsNotExist(err) || fi.Size() == 0 {
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return t.Unix()
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}
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f, err := os.Open(r.eventTsPath)
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defer f.Close()
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if err != nil {
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logrus.Warn("libcontainerd: Unable to access last event ts: %v", err)
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return t.Unix()
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}
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b := make([]byte, fi.Size())
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n, err := f.Read(b)
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if err != nil || n != len(b) {
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logrus.Warn("libcontainerd: Unable to read last event ts: %v", err)
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return t.Unix()
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}
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t.UnmarshalText(b)
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return t.Unix()
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}
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func (r *remote) startEventsMonitor() error {
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// First, get past events
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er := &containerd.EventsRequest{
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Timestamp: uint64(r.getLastEventTimestamp()),
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}
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events, err := r.apiClient.Events(context.Background(), er)
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if err != nil {
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return err
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}
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go r.handleEventStream(events)
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return nil
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}
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func (r *remote) handleEventStream(events containerd.API_EventsClient) {
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live := false
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for {
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e, err := events.Recv()
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if err != nil {
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logrus.Errorf("failed to receive event from containerd: %v", err)
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go r.startEventsMonitor()
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return
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}
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if live == false {
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logrus.Debugf("received past containerd event: %#v", e)
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// Pause/Resume events should never happens after exit one
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switch e.Type {
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case StateExit:
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r.pastEvents[e.Id] = e
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case StatePause:
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r.pastEvents[e.Id] = e
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case StateResume:
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r.pastEvents[e.Id] = e
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case stateLive:
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live = true
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r.updateEventTimestamp(time.Unix(int64(e.Timestamp), 0))
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}
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} else {
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logrus.Debugf("received containerd event: %#v", e)
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var container *container
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var c *client
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r.RLock()
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for _, c = range r.clients {
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container, err = c.getContainer(e.Id)
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if err == nil {
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break
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}
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}
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r.RUnlock()
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if container == nil {
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logrus.Errorf("no state for container: %q", err)
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continue
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}
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if err := container.handleEvent(e); err != nil {
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logrus.Errorf("error processing state change for %s: %v", e.Id, err)
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}
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r.updateEventTimestamp(time.Unix(int64(e.Timestamp), 0))
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}
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}
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}
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func (r *remote) runContainerdDaemon() error {
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pidFilename := filepath.Join(r.stateDir, containerdPidFilename)
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f, err := os.OpenFile(pidFilename, os.O_RDWR|os.O_CREATE, 0600)
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defer f.Close()
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if err != nil {
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return err
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}
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// File exist, check if the daemon is alive
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b := make([]byte, 8)
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n, err := f.Read(b)
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if err != nil && err != io.EOF {
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return err
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}
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if n > 0 {
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pid, err := strconv.ParseUint(string(b[:n]), 10, 64)
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if err != nil {
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return err
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}
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if utils.IsProcessAlive(int(pid)) {
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logrus.Infof("previous instance of containerd still alive (%d)", pid)
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r.daemonPid = int(pid)
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return nil
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}
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}
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// rewind the file
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_, err = f.Seek(0, os.SEEK_SET)
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if err != nil {
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return err
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}
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// Truncate it
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err = f.Truncate(0)
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if err != nil {
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return err
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}
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// Start a new instance
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args := []string{"-l", r.rpcAddr, "--runtime", "docker-runc"}
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if r.debugLog {
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args = append(args, "--debug", "--metrics-interval=0")
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}
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if len(r.runtimeArgs) > 0 {
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for _, v := range r.runtimeArgs {
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args = append(args, "--runtime-args")
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args = append(args, v)
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}
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logrus.Debugf("runContainerdDaemon: runtimeArgs: %s", args)
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}
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cmd := exec.Command(containerdBinary, args...)
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// redirect containerd logs to docker logs
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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cmd.SysProcAttr = &syscall.SysProcAttr{Setsid: true}
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cmd.Env = nil
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// clear the NOTIFY_SOCKET from the env when starting containerd
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for _, e := range os.Environ() {
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if !strings.HasPrefix(e, "NOTIFY_SOCKET") {
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cmd.Env = append(cmd.Env, e)
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}
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}
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if err := cmd.Start(); err != nil {
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return err
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}
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logrus.Infof("New containerd process, pid: %d\n", cmd.Process.Pid)
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if _, err := f.WriteString(fmt.Sprintf("%d", cmd.Process.Pid)); err != nil {
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utils.KillProcess(cmd.Process.Pid)
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return err
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}
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go cmd.Wait() // Reap our child when needed
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r.daemonPid = cmd.Process.Pid
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return nil
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}
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// WithRemoteAddr sets the external containerd socket to connect to.
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func WithRemoteAddr(addr string) RemoteOption {
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return rpcAddr(addr)
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}
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type rpcAddr string
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func (a rpcAddr) Apply(r Remote) error {
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if remote, ok := r.(*remote); ok {
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remote.rpcAddr = string(a)
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return nil
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}
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return fmt.Errorf("WithRemoteAddr option not supported for this remote")
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}
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// WithRuntimeArgs sets the list of runtime args passed to containerd
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func WithRuntimeArgs(args []string) RemoteOption {
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return runtimeArgs(args)
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}
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type runtimeArgs []string
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func (rt runtimeArgs) Apply(r Remote) error {
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if remote, ok := r.(*remote); ok {
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remote.runtimeArgs = rt
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return nil
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}
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return fmt.Errorf("WithRuntimeArgs option not supported for this remote")
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}
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// WithStartDaemon defines if libcontainerd should also run containerd daemon.
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func WithStartDaemon(start bool) RemoteOption {
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return startDaemon(start)
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}
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type startDaemon bool
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func (s startDaemon) Apply(r Remote) error {
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if remote, ok := r.(*remote); ok {
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remote.startDaemon = bool(s)
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return nil
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}
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return fmt.Errorf("WithStartDaemon option not supported for this remote")
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}
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// WithDebugLog defines if containerd debug logs will be enabled for daemon.
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func WithDebugLog(debug bool) RemoteOption {
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return debugLog(debug)
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}
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type debugLog bool
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func (d debugLog) Apply(r Remote) error {
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if remote, ok := r.(*remote); ok {
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remote.debugLog = bool(d)
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return nil
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}
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return fmt.Errorf("WithDebugLog option not supported for this remote")
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}
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