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|
package libpod
import (
"bufio"
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"net"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
"syscall"
"time"
"github.com/containers/libpod/pkg/rootless"
"github.com/containers/libpod/pkg/util"
"github.com/coreos/go-systemd/activation"
"github.com/cri-o/ocicni/pkg/ocicni"
spec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/opencontainers/selinux/go-selinux"
"github.com/opencontainers/selinux/go-selinux/label"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"golang.org/x/sys/unix"
kwait "k8s.io/apimachinery/pkg/util/wait"
// TODO import these functions into libpod and remove the import
// Trying to keep libpod from depending on CRI-O code
"github.com/containers/libpod/utils"
)
// OCI code is undergoing heavy rewrite
const (
// CgroupfsCgroupsManager represents cgroupfs native cgroup manager
CgroupfsCgroupsManager = "cgroupfs"
// SystemdCgroupsManager represents systemd native cgroup manager
SystemdCgroupsManager = "systemd"
// ContainerCreateTimeout represents the value of container creating timeout
ContainerCreateTimeout = 240 * time.Second
// Timeout before declaring that runtime has failed to kill a given
// container
killContainerTimeout = 5 * time.Second
// DefaultShmSize is the default shm size
DefaultShmSize = 64 * 1024 * 1024
// NsRunDir is the default directory in which running network namespaces
// are stored
NsRunDir = "/var/run/netns"
)
// OCIRuntime represents an OCI-compatible runtime that libpod can call into
// to perform container operations
type OCIRuntime struct {
name string
path string
conmonPath string
conmonEnv []string
cgroupManager string
tmpDir string
exitsDir string
socketsDir string
logSizeMax int64
noPivot bool
reservePorts bool
}
// syncInfo is used to return data from monitor process to daemon
type syncInfo struct {
Pid int `json:"pid"`
Message string `json:"message,omitempty"`
}
// Make a new OCI runtime with provided options
func newOCIRuntime(name string, path string, conmonPath string, conmonEnv []string, cgroupManager string, tmpDir string, logSizeMax int64, noPivotRoot bool, reservePorts bool) (*OCIRuntime, error) {
runtime := new(OCIRuntime)
runtime.name = name
runtime.path = path
runtime.conmonPath = conmonPath
runtime.conmonEnv = conmonEnv
runtime.cgroupManager = cgroupManager
runtime.tmpDir = tmpDir
runtime.logSizeMax = logSizeMax
runtime.noPivot = noPivotRoot
runtime.reservePorts = reservePorts
runtime.exitsDir = filepath.Join(runtime.tmpDir, "exits")
runtime.socketsDir = filepath.Join(runtime.tmpDir, "socket")
if cgroupManager != CgroupfsCgroupsManager && cgroupManager != SystemdCgroupsManager {
return nil, errors.Wrapf(ErrInvalidArg, "invalid cgroup manager specified: %s", cgroupManager)
}
// Create the exit files and attach sockets directories
if err := os.MkdirAll(runtime.exitsDir, 0750); err != nil {
// The directory is allowed to exist
if !os.IsExist(err) {
return nil, errors.Wrapf(err, "error creating OCI runtime exit files directory %s",
runtime.exitsDir)
}
}
if err := os.MkdirAll(runtime.socketsDir, 0750); err != nil {
// The directory is allowed to exist
if !os.IsExist(err) {
return nil, errors.Wrapf(err, "error creating OCI runtime attach sockets directory %s",
runtime.socketsDir)
}
}
return runtime, nil
}
// Create systemd unit name for cgroup scopes
func createUnitName(prefix string, name string) string {
return fmt.Sprintf("%s-%s.scope", prefix, name)
}
// Wait for a container which has been sent a signal to stop
func waitContainerStop(ctr *Container, timeout time.Duration) error {
done := make(chan struct{})
chControl := make(chan struct{})
go func() {
for {
select {
case <-chControl:
return
default:
// Check if the process is still around
err := unix.Kill(ctr.state.PID, 0)
if err == unix.ESRCH {
close(done)
return
}
time.Sleep(100 * time.Millisecond)
}
}
}()
select {
case <-done:
return nil
case <-time.After(timeout):
close(chControl)
return errors.Errorf("container %s did not die within timeout", ctr.ID())
}
}
// Wait for a set of given PIDs to stop
func waitPidsStop(pids []int, timeout time.Duration) error {
done := make(chan struct{})
chControl := make(chan struct{})
go func() {
for {
select {
case <-chControl:
return
default:
allClosed := true
for _, pid := range pids {
if err := unix.Kill(pid, 0); err != unix.ESRCH {
allClosed = false
break
}
}
if allClosed {
close(done)
return
}
time.Sleep(100 * time.Millisecond)
}
}
}()
select {
case <-done:
return nil
case <-time.After(timeout):
close(chControl)
return errors.Errorf("given PIDs did not die within timeout")
}
}
func bindPorts(ports []ocicni.PortMapping) ([]*os.File, error) {
var files []*os.File
for _, i := range ports {
switch i.Protocol {
case "udp":
addr, err := net.ResolveUDPAddr("udp", fmt.Sprintf("%s:%d", i.HostIP, i.HostPort))
if err != nil {
return nil, errors.Wrapf(err, "cannot resolve the UDP address")
}
server, err := net.ListenUDP("udp", addr)
if err != nil {
return nil, errors.Wrapf(err, "cannot listen on the UDP port")
}
f, err := server.File()
if err != nil {
return nil, errors.Wrapf(err, "cannot get file for UDP socket")
}
files = append(files, f)
break
case "tcp":
addr, err := net.ResolveTCPAddr("tcp4", fmt.Sprintf("%s:%d", i.HostIP, i.HostPort))
if err != nil {
return nil, errors.Wrapf(err, "cannot resolve the TCP address")
}
server, err := net.ListenTCP("tcp4", addr)
if err != nil {
return nil, errors.Wrapf(err, "cannot listen on the TCP port")
}
f, err := server.File()
if err != nil {
return nil, errors.Wrapf(err, "cannot get file for TCP socket")
}
files = append(files, f)
break
default:
return nil, fmt.Errorf("unknown protocol %s", i.Protocol)
}
}
return files, nil
}
func (r *OCIRuntime) createOCIContainer(ctr *Container, cgroupParent string, restoreContainer bool) (err error) {
var stderrBuf bytes.Buffer
runtimeDir, err := util.GetRootlessRuntimeDir()
if err != nil {
return err
}
parentPipe, childPipe, err := newPipe()
if err != nil {
return errors.Wrapf(err, "error creating socket pair")
}
childStartPipe, parentStartPipe, err := newPipe()
if err != nil {
return errors.Wrapf(err, "error creating socket pair for start pipe")
}
defer parentPipe.Close()
defer parentStartPipe.Close()
args := []string{}
if r.cgroupManager == SystemdCgroupsManager {
args = append(args, "-s")
}
args = append(args, "-c", ctr.ID())
args = append(args, "-u", ctr.ID())
args = append(args, "-r", r.path)
args = append(args, "-b", ctr.bundlePath())
args = append(args, "-p", filepath.Join(ctr.state.RunDir, "pidfile"))
args = append(args, "-l", ctr.LogPath())
args = append(args, "--exit-dir", r.exitsDir)
if ctr.config.ConmonPidFile != "" {
args = append(args, "--conmon-pidfile", ctr.config.ConmonPidFile)
}
if len(ctr.config.ExitCommand) > 0 {
args = append(args, "--exit-command", ctr.config.ExitCommand[0])
for _, arg := range ctr.config.ExitCommand[1:] {
args = append(args, []string{"--exit-command-arg", arg}...)
}
}
args = append(args, "--socket-dir-path", r.socketsDir)
if ctr.config.Spec.Process.Terminal {
args = append(args, "-t")
} else if ctr.config.Stdin {
args = append(args, "-i")
}
if r.logSizeMax >= 0 {
args = append(args, "--log-size-max", fmt.Sprintf("%v", r.logSizeMax))
}
if r.noPivot {
args = append(args, "--no-pivot")
}
logLevel := logrus.GetLevel()
args = append(args, "--log-level", logLevel.String())
if logLevel == logrus.DebugLevel {
logrus.Debugf("%s messages will be logged to syslog", r.conmonPath)
args = append(args, "--syslog")
}
if restoreContainer {
args = append(args, "--restore", ctr.CheckpointPath())
}
logrus.WithFields(logrus.Fields{
"args": args,
}).Debugf("running conmon: %s", r.conmonPath)
cmd := exec.Command(r.conmonPath, args...)
cmd.Dir = ctr.bundlePath()
cmd.SysProcAttr = &syscall.SysProcAttr{
Setpgid: true,
}
// TODO this is probably a really bad idea for some uses
// Make this configurable
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if ctr.config.Spec.Process.Terminal {
cmd.Stderr = &stderrBuf
}
cmd.ExtraFiles = append(cmd.ExtraFiles, childPipe, childStartPipe)
// 0, 1 and 2 are stdin, stdout and stderr
cmd.Env = append(r.conmonEnv, fmt.Sprintf("_OCI_SYNCPIPE=%d", 3))
cmd.Env = append(cmd.Env, fmt.Sprintf("_OCI_STARTPIPE=%d", 4))
cmd.Env = append(cmd.Env, fmt.Sprintf("XDG_RUNTIME_DIR=%s", runtimeDir))
if r.reservePorts {
ports, err := bindPorts(ctr.config.PortMappings)
if err != nil {
return err
}
// Leak the port we bound in the conmon process. These fd's won't be used
// by the container and conmon will keep the ports busy so that another
// process cannot use them.
cmd.ExtraFiles = append(cmd.ExtraFiles, ports...)
}
if rootless.IsRootless() {
ctr.rootlessSlirpSyncR, ctr.rootlessSlirpSyncW, err = os.Pipe()
if err != nil {
return errors.Wrapf(err, "failed to create rootless network sync pipe")
}
// Leak one end in conmon, the other one will be leaked into slirp4netns
cmd.ExtraFiles = append(cmd.ExtraFiles, ctr.rootlessSlirpSyncW)
}
if notify, ok := os.LookupEnv("NOTIFY_SOCKET"); ok {
cmd.Env = append(cmd.Env, fmt.Sprintf("NOTIFY_SOCKET=%s", notify))
}
if listenfds, ok := os.LookupEnv("LISTEN_FDS"); ok {
cmd.Env = append(cmd.Env, fmt.Sprintf("LISTEN_FDS=%s", listenfds), "LISTEN_PID=1")
fds := activation.Files(false)
cmd.ExtraFiles = append(cmd.ExtraFiles, fds...)
}
if selinux.GetEnabled() {
// Set the label of the conmon process to be level :s0
// This will allow the container processes to talk to fifo-files
// passed into the container by conmon
var plabel string
plabel, err = selinux.CurrentLabel()
if err != nil {
childPipe.Close()
return errors.Wrapf(err, "Failed to get current SELinux label")
}
c := selinux.NewContext(plabel)
runtime.LockOSThread()
if c["level"] != "s0" && c["level"] != "" {
c["level"] = "s0"
if err = label.SetProcessLabel(c.Get()); err != nil {
runtime.UnlockOSThread()
return err
}
}
err = cmd.Start()
// Ignore error returned from SetProcessLabel("") call,
// can't recover.
label.SetProcessLabel("")
runtime.UnlockOSThread()
} else {
err = cmd.Start()
}
if err != nil {
childPipe.Close()
return err
}
defer cmd.Wait()
// We don't need childPipe on the parent side
childPipe.Close()
childStartPipe.Close()
// Move conmon to specified cgroup
if err := r.moveConmonToCgroup(ctr, cgroupParent, cmd); err != nil {
return err
}
/* We set the cgroup, now the child can start creating children */
someData := []byte{0}
_, err = parentStartPipe.Write(someData)
if err != nil {
return err
}
/* Wait for initial setup and fork, and reap child */
err = cmd.Wait()
if err != nil {
return err
}
defer func() {
if err != nil {
if err2 := r.deleteContainer(ctr); err2 != nil {
logrus.Errorf("Error removing container %s from runtime after creation failed", ctr.ID())
}
}
}()
// Wait to get container pid from conmon
type syncStruct struct {
si *syncInfo
err error
}
ch := make(chan syncStruct)
go func() {
var si *syncInfo
rdr := bufio.NewReader(parentPipe)
b, err := rdr.ReadBytes('\n')
if err != nil {
ch <- syncStruct{err: err}
}
if err := json.Unmarshal(b, &si); err != nil {
ch <- syncStruct{err: err}
return
}
ch <- syncStruct{si: si}
}()
select {
case ss := <-ch:
if ss.err != nil {
return errors.Wrapf(ss.err, "error reading container (probably exited) json message")
}
logrus.Debugf("Received container pid: %d", ss.si.Pid)
if ss.si.Pid == -1 {
if ss.si.Message != "" {
return errors.Wrapf(ErrInternal, "container create failed: %s", ss.si.Message)
}
return errors.Wrapf(ErrInternal, "container create failed")
}
ctr.state.PID = ss.si.Pid
case <-time.After(ContainerCreateTimeout):
return errors.Wrapf(ErrInternal, "container creation timeout")
}
return nil
}
// updateContainerStatus retrieves the current status of the container from the
// runtime. It updates the container's state but does not save it.
// If useRunc is false, we will not directly hit runc to see the container's
// status, but will instead only check for the existence of the conmon exit file
// and update state to stopped if it exists.
func (r *OCIRuntime) updateContainerStatus(ctr *Container, useRunc bool) error {
exitFile := ctr.exitFilePath()
runtimeDir, err := util.GetRootlessRuntimeDir()
if err != nil {
return err
}
// If not using runc, we don't need to do most of this.
if !useRunc {
// If the container's not running, nothing to do.
if ctr.state.State != ContainerStateRunning {
return nil
}
// Check for the exit file conmon makes
info, err := os.Stat(exitFile)
if err != nil {
if os.IsNotExist(err) {
// Container is still running, no error
return nil
}
return errors.Wrapf(err, "error running stat on container %s exit file", ctr.ID())
}
// Alright, it exists. Transition to Stopped state.
ctr.state.State = ContainerStateStopped
// Read the exit file to get our stopped time and exit code.
return ctr.handleExitFile(exitFile, info)
}
// Store old state so we know if we were already stopped
oldState := ctr.state.State
state := new(spec.State)
cmd := exec.Command(r.path, "state", ctr.ID())
cmd.Env = append(cmd.Env, fmt.Sprintf("XDG_RUNTIME_DIR=%s", runtimeDir))
outPipe, err := cmd.StdoutPipe()
if err != nil {
return errors.Wrapf(err, "getting stdout pipe")
}
errPipe, err := cmd.StderrPipe()
if err != nil {
return errors.Wrapf(err, "getting stderr pipe")
}
if err := cmd.Start(); err != nil {
out, err2 := ioutil.ReadAll(errPipe)
if err2 != nil {
return errors.Wrapf(err, "error getting container %s state", ctr.ID())
}
if strings.Contains(string(out), "does not exist") {
ctr.removeConmonFiles()
ctr.state.ExitCode = -1
ctr.state.FinishedTime = time.Now()
ctr.state.State = ContainerStateExited
return nil
}
return errors.Wrapf(err, "error getting container %s state. stderr/out: %s", ctr.ID(), out)
}
defer cmd.Wait()
errPipe.Close()
out, err := ioutil.ReadAll(outPipe)
if err != nil {
return errors.Wrapf(err, "error reading stdout: %s", ctr.ID())
}
if err := json.NewDecoder(bytes.NewBuffer(out)).Decode(state); err != nil {
return errors.Wrapf(err, "error decoding container status for container %s", ctr.ID())
}
ctr.state.PID = state.Pid
switch state.Status {
case "created":
ctr.state.State = ContainerStateCreated
case "paused":
ctr.state.State = ContainerStatePaused
case "running":
ctr.state.State = ContainerStateRunning
case "stopped":
ctr.state.State = ContainerStateStopped
default:
return errors.Wrapf(ErrInternal, "unrecognized status returned by runtime for container %s: %s",
ctr.ID(), state.Status)
}
// Only grab exit status if we were not already stopped
// If we were, it should already be in the database
if ctr.state.State == ContainerStateStopped && oldState != ContainerStateStopped {
var fi os.FileInfo
err = kwait.ExponentialBackoff(
kwait.Backoff{
Duration: 500 * time.Millisecond,
Factor: 1.2,
Steps: 6,
},
func() (bool, error) {
var err error
fi, err = os.Stat(exitFile)
if err != nil {
// wait longer
return false, nil
}
return true, nil
})
if err != nil {
ctr.state.ExitCode = -1
ctr.state.FinishedTime = time.Now()
logrus.Errorf("No exit file for container %s found: %v", ctr.ID(), err)
return nil
}
return ctr.handleExitFile(exitFile, fi)
}
return nil
}
// startContainer starts the given container
// Sets time the container was started, but does not save it.
func (r *OCIRuntime) startContainer(ctr *Container) error {
// TODO: streams should probably *not* be our STDIN/OUT/ERR - redirect to buffers?
runtimeDir, err := util.GetRootlessRuntimeDir()
if err != nil {
return err
}
env := []string{fmt.Sprintf("XDG_RUNTIME_DIR=%s", runtimeDir)}
if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, env, r.path, "start", ctr.ID()); err != nil {
return err
}
ctr.state.StartedTime = time.Now()
return nil
}
// killContainer sends the given signal to the given container
func (r *OCIRuntime) killContainer(ctr *Container, signal uint) error {
logrus.Debugf("Sending signal %d to container %s", signal, ctr.ID())
runtimeDir, err := util.GetRootlessRuntimeDir()
if err != nil {
return err
}
env := []string{fmt.Sprintf("XDG_RUNTIME_DIR=%s", runtimeDir)}
if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, env, r.path, "kill", ctr.ID(), fmt.Sprintf("%d", signal)); err != nil {
return errors.Wrapf(err, "error sending signal to container %s", ctr.ID())
}
return nil
}
// stopContainer stops a container, first using its given stop signal (or
// SIGTERM if no signal was specified), then using SIGKILL
// Timeout is given in seconds. If timeout is 0, the container will be
// immediately kill with SIGKILL
// Does not set finished time for container, assumes you will run updateStatus
// after to pull the exit code
func (r *OCIRuntime) stopContainer(ctr *Container, timeout uint) error {
logrus.Debugf("Stopping container %s (PID %d)", ctr.ID(), ctr.state.PID)
// Ping the container to see if it's alive
// If it's not, it's already stopped, return
err := unix.Kill(ctr.state.PID, 0)
if err == unix.ESRCH {
return nil
}
stopSignal := ctr.config.StopSignal
if stopSignal == 0 {
stopSignal = uint(syscall.SIGTERM)
}
if timeout > 0 {
if err := r.killContainer(ctr, stopSignal); err != nil {
// Is the container gone?
// If so, it probably died between the first check and
// our sending the signal
// The container is stopped, so exit cleanly
err := unix.Kill(ctr.state.PID, 0)
if err == unix.ESRCH {
return nil
}
return err
}
if err := waitContainerStop(ctr, time.Duration(timeout)*time.Second); err != nil {
logrus.Warnf("Timed out stopping container %s, resorting to SIGKILL", ctr.ID())
} else {
// No error, the container is dead
return nil
}
}
var args []string
if rootless.IsRootless() {
// we don't use --all for rootless containers as the OCI runtime might use
// the cgroups to determine the PIDs, but for rootless containers there is
// not any.
args = []string{"kill", ctr.ID(), "KILL"}
} else {
args = []string{"kill", "--all", ctr.ID(), "KILL"}
}
runtimeDir, err := util.GetRootlessRuntimeDir()
if err != nil {
return err
}
env := []string{fmt.Sprintf("XDG_RUNTIME_DIR=%s", runtimeDir)}
if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, env, r.path, args...); err != nil {
// Again, check if the container is gone. If it is, exit cleanly.
err := unix.Kill(ctr.state.PID, 0)
if err == unix.ESRCH {
return nil
}
return errors.Wrapf(err, "error sending SIGKILL to container %s", ctr.ID())
}
// Give runtime a few seconds to make it happen
if err := waitContainerStop(ctr, killContainerTimeout); err != nil {
return err
}
return nil
}
// deleteContainer deletes a container from the OCI runtime
func (r *OCIRuntime) deleteContainer(ctr *Container) error {
_, err := utils.ExecCmd(r.path, "delete", "--force", ctr.ID())
return err
}
// pauseContainer pauses the given container
func (r *OCIRuntime) pauseContainer(ctr *Container) error {
runtimeDir, err := util.GetRootlessRuntimeDir()
if err != nil {
return err
}
env := []string{fmt.Sprintf("XDG_RUNTIME_DIR=%s", runtimeDir)}
return utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, env, r.path, "pause", ctr.ID())
}
// unpauseContainer unpauses the given container
func (r *OCIRuntime) unpauseContainer(ctr *Container) error {
runtimeDir, err := util.GetRootlessRuntimeDir()
if err != nil {
return err
}
env := []string{fmt.Sprintf("XDG_RUNTIME_DIR=%s", runtimeDir)}
return utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, env, r.path, "resume", ctr.ID())
}
// execContainer executes a command in a running container
// TODO: Add --detach support
// TODO: Convert to use conmon
// TODO: add --pid-file and use that to generate exec session tracking
func (r *OCIRuntime) execContainer(c *Container, cmd, capAdd, env []string, tty bool, user, sessionID string) (*exec.Cmd, error) {
if len(cmd) == 0 {
return nil, errors.Wrapf(ErrInvalidArg, "must provide a command to execute")
}
if sessionID == "" {
return nil, errors.Wrapf(ErrEmptyID, "must provide a session ID for exec")
}
runtimeDir, err := util.GetRootlessRuntimeDir()
if err != nil {
return nil, err
}
args := []string{}
// TODO - should we maintain separate logpaths for exec sessions?
args = append(args, "--log", c.LogPath())
args = append(args, "exec")
args = append(args, "--cwd", c.config.Spec.Process.Cwd)
args = append(args, "--pid-file", c.execPidPath(sessionID))
if tty {
args = append(args, "--tty")
} else {
args = append(args, "--tty=false")
}
if user != "" {
args = append(args, "--user", user)
}
if c.config.Spec.Process.NoNewPrivileges {
args = append(args, "--no-new-privs")
}
for _, cap := range capAdd {
args = append(args, "--cap", cap)
}
for _, envVar := range env {
args = append(args, "--env", envVar)
}
// Append container ID and command
args = append(args, c.ID())
args = append(args, cmd...)
logrus.Debugf("Starting runtime %s with following arguments: %v", r.path, args)
execCmd := exec.Command(r.path, args...)
execCmd.Stdout = os.Stdout
execCmd.Stderr = os.Stderr
execCmd.Stdin = os.Stdin
execCmd.Env = append(execCmd.Env, fmt.Sprintf("XDG_RUNTIME_DIR=%s", runtimeDir))
if err := execCmd.Start(); err != nil {
return nil, errors.Wrapf(err, "cannot start container %s", c.ID())
}
return execCmd, nil
}
// execStopContainer stops all active exec sessions in a container
// It will also stop all other processes in the container. It is only intended
// to be used to assist in cleanup when removing a container.
// SIGTERM is used by default to stop processes. If SIGTERM fails, SIGKILL will be used.
func (r *OCIRuntime) execStopContainer(ctr *Container, timeout uint) error {
// Do we have active exec sessions?
if len(ctr.state.ExecSessions) == 0 {
return nil
}
// Get a list of active exec sessions
execSessions := []int{}
for _, session := range ctr.state.ExecSessions {
pid := session.PID
// Ping the PID with signal 0 to see if it still exists
if err := unix.Kill(pid, 0); err == unix.ESRCH {
continue
}
execSessions = append(execSessions, pid)
}
// All the sessions may be dead
// If they are, just return
if len(execSessions) == 0 {
return nil
}
runtimeDir, err := util.GetRootlessRuntimeDir()
if err != nil {
return err
}
env := []string{fmt.Sprintf("XDG_RUNTIME_DIR=%s", runtimeDir)}
// If timeout is 0, just use SIGKILL
if timeout > 0 {
// Stop using SIGTERM by default
// Use SIGSTOP after a timeout
logrus.Debugf("Killing all processes in container %s with SIGTERM", ctr.ID())
if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, env, r.path, "kill", "--all", ctr.ID(), "TERM"); err != nil {
return errors.Wrapf(err, "error sending SIGTERM to container %s processes", ctr.ID())
}
// Wait for all processes to stop
if err := waitPidsStop(execSessions, time.Duration(timeout)*time.Second); err != nil {
logrus.Warnf("Timed out stopping container %s exec sessions", ctr.ID())
} else {
// No error, all exec sessions are dead
return nil
}
}
// Send SIGKILL
logrus.Debugf("Killing all processes in container %s with SIGKILL", ctr.ID())
if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, env, r.path, "kill", "--all", ctr.ID(), "KILL"); err != nil {
return errors.Wrapf(err, "error sending SIGKILL to container %s processes", ctr.ID())
}
// Give the processes a few seconds to go down
if err := waitPidsStop(execSessions, killContainerTimeout); err != nil {
return errors.Wrapf(err, "failed to kill container %s exec sessions", ctr.ID())
}
return nil
}
// checkpointContainer checkpoints the given container
func (r *OCIRuntime) checkpointContainer(ctr *Container) error {
// imagePath is used by CRIU to store the actual checkpoint files
imagePath := ctr.CheckpointPath()
// workPath will be used to store dump.log and stats-dump
workPath := ctr.bundlePath()
logrus.Debugf("Writing checkpoint to %s", imagePath)
logrus.Debugf("Writing checkpoint logs to %s", workPath)
return utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, nil, r.path, "checkpoint",
"--image-path", imagePath, "--work-path", workPath, ctr.ID())
}
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