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Improvements to the original sharing implementation.

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- Print the mount table as in /proc/self/mountinfo
- Do not exit prematurely when one of the ipc mounts doesn't exist.
- Do not exit prematurely when one of the ipc mounts cannot be unmounted.
- Add a unit test to see if the cleanup really works.
- Use syscall.MNT_DETACH to cleanup mounts after a crash.
- Unmount IPC mounts when the daemon unregisters an old running container.

Signed-off-by: David Calavera <david.calavera@gmail.com>
This commit is contained in:
David Calavera 2015-08-26 14:00:01 +02:00
parent c8291f7107
commit b1d2f52bb2
6 changed files with 114 additions and 24 deletions
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6
daemon/container.go
View file

@ -296,7 +296,7 @@ func (container *Container) Start() (err error) {
return err
}
if !(container.hostConfig.IpcMode.IsContainer() || container.hostConfig.IpcMode.IsHost()) {
if !container.hostConfig.IpcMode.IsContainer() && !container.hostConfig.IpcMode.IsHost() {
if err := container.setupIpcDirs(); err != nil {
return err
}
@ -366,11 +366,11 @@ func (container *Container) cleanup() {
container.releaseNetwork()
if err := container.unmountIpcMounts(); err != nil {
logrus.Errorf("%v: Failed to umount ipc filesystems: %v", container.ID, err)
logrus.Errorf("%s: Failed to umount ipc filesystems: %v", container.ID, err)
}
if err := container.Unmount(); err != nil {
logrus.Errorf("%v: Failed to umount filesystem: %v", container.ID, err)
logrus.Errorf("%s: Failed to umount filesystem: %v", container.ID, err)
}
for _, eConfig := range container.execCommands.s {

32
daemon/container_unix.go
View file

@ -1242,10 +1242,10 @@ func (container *Container) removeMountPoints(rm bool) error {
}
func (container *Container) shmPath() (string, error) {
return container.GetRootResourcePath("shm")
return container.getRootResourcePath("shm")
}
func (container *Container) mqueuePath() (string, error) {
return container.GetRootResourcePath("mqueue")
return container.getRootResourcePath("mqueue")
}
func (container *Container) setupIpcDirs() error {
@ -1258,7 +1258,7 @@ func (container *Container) setupIpcDirs() error {
return err
}
if err := syscall.Mount("shm", shmPath, "tmpfs", uintptr(syscall.MS_NOEXEC|syscall.MS_NOSUID|syscall.MS_NODEV), label.FormatMountLabel("mode=1777,size=65536k", container.GetMountLabel())); err != nil {
if err := syscall.Mount("shm", shmPath, "tmpfs", uintptr(syscall.MS_NOEXEC|syscall.MS_NOSUID|syscall.MS_NODEV), label.FormatMountLabel("mode=1777,size=65536k", container.getMountLabel())); err != nil {
return fmt.Errorf("mounting shm tmpfs: %s", err)
}
@ -1283,22 +1283,32 @@ func (container *Container) unmountIpcMounts() error {
return nil
}
var errors []string
shmPath, err := container.shmPath()
if err != nil {
return fmt.Errorf("shm path does not exist %v", err)
logrus.Error(err)
errors = append(errors, err.Error())
} else {
if err := detachMounted(shmPath); err != nil {
logrus.Errorf("failed to umount %s: %v", shmPath, err)
errors = append(errors, err.Error())
}
if err := syscall.Unmount(shmPath, syscall.MNT_DETACH); err != nil {
return fmt.Errorf("failed to umount %s filesystem %v", shmPath, err)
}
mqueuePath, err := container.mqueuePath()
if err != nil {
return fmt.Errorf("mqueue path does not exist %v", err)
logrus.Error(err)
errors = append(errors, err.Error())
} else {
if err := detachMounted(mqueuePath); err != nil {
logrus.Errorf("failed to umount %s: %v", mqueuePath, err)
errors = append(errors, err.Error())
}
}
if err := syscall.Unmount(mqueuePath, syscall.MNT_DETACH); err != nil {
return fmt.Errorf("failed to umount %s filesystem %v", mqueuePath, err)
if len(errors) > 0 {
return fmt.Errorf("failed to cleanup ipc mounts:\n%v", strings.Join(errors, "\n"))
}
return nil
@ -1322,3 +1332,7 @@ func (container *Container) ipcMounts() []execdriver.Mount {
})
return mounts
}
func detachMounted(path string) error {
return syscall.Unmount(path, syscall.MNT_DETACH)
}

10
daemon/daemon.go
View file

@ -209,6 +209,9 @@ func (daemon *Daemon) Register(container *Container) error {
}
daemon.execDriver.Terminate(cmd)
if err := container.unmountIpcMounts(); err != nil {
logrus.Errorf("%s: Failed to umount ipc filesystems: %v", container.ID, err)
}
if err := container.Unmount(); err != nil {
logrus.Debugf("unmount error %s", err)
}
@ -756,13 +759,14 @@ func NewDaemon(config *Config, registryService *registry.Service) (daemon *Daemo
d.EventsService = eventsService
d.volumes = volStore
d.root = config.Root
go d.execCommandGC()
if err := d.restore(); err != nil {
if err := d.cleanupMounts(); err != nil {
return nil, err
}
if err := d.cleanupMounts(); err != nil {
go d.execCommandGC()
if err := d.restore(); err != nil {
return nil, err
}

24
daemon/daemon_linux.go
View file

@ -2,12 +2,13 @@ package daemon
import (
"bufio"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/pkg/mount"
)
// cleanupMounts umounts shm/mqueue mounts for old containers
@ -19,17 +20,24 @@ func (daemon *Daemon) cleanupMounts() error {
}
defer f.Close()
sc := bufio.NewScanner(f)
return daemon.cleanupMountsFromReader(f, detachMounted)
}
func (daemon *Daemon) cleanupMountsFromReader(reader io.Reader, unmount func(target string) error) error {
sc := bufio.NewScanner(reader)
var errors []string
for sc.Scan() {
line := sc.Text()
fields := strings.Split(line, " ")
fields := strings.Fields(line)
if strings.HasPrefix(fields[4], daemon.repository) {
logrus.Debugf("Mount base: %v, repository %s", fields[4], daemon.repository)
mnt := fields[4]
mountBase := filepath.Base(mnt)
if mountBase == "mqueue" || mountBase == "shm" {
logrus.Debugf("Unmounting %+v", mnt)
if err := mount.Unmount(mnt); err != nil {
return err
logrus.Debugf("Unmounting %v", mnt)
if err := unmount(mnt); err != nil {
logrus.Error(err)
errors = append(errors, err.Error())
}
}
}
@ -39,6 +47,10 @@ func (daemon *Daemon) cleanupMounts() error {
return err
}
if len(errors) > 0 {
return fmt.Errorf("Error cleaningup mounts:\n%v", strings.Join(errors, "\n"))
}
logrus.Debugf("Cleaning up old shm/mqueue mounts: done.")
return nil
}

58
daemon/daemon_linux_test.go Normal file
View file

@ -0,0 +1,58 @@
// +build linux
package daemon
import (
"strings"
"testing"
)
func TestCleanupMounts(t *testing.T) {
fixture := `230 138 0:60 / / rw,relatime - overlay overlay rw,lowerdir=/var/lib/docker/overlay/0ef9f93d5d365c1385b09d54bbee6afff3d92002c16f22eccb6e1549b2ff97d8/root,upperdir=/var/lib/docker/overlay/dfac036ce135a8914e292cb2f6fea114f7339983c186366aa26d0051e93162cb/upper,workdir=/var/lib/docker/overlay/dfac036ce135a8914e292cb2f6fea114f7339983c186366aa26d0051e93162cb/work
231 230 0:56 / /proc rw,nosuid,nodev,noexec,relatime - proc proc rw
232 230 0:57 / /dev rw,nosuid - tmpfs tmpfs rw,mode=755
233 232 0:58 / /dev/pts rw,nosuid,noexec,relatime - devpts devpts rw,gid=5,mode=620,ptmxmode=666
234 232 0:59 / /dev/shm rw,nosuid,nodev,noexec,relatime - tmpfs shm rw,size=65536k
235 232 0:55 / /dev/mqueue rw,nosuid,nodev,noexec,relatime - mqueue mqueue rw
236 230 0:61 / /sys rw,nosuid,nodev,noexec,relatime - sysfs sysfs rw
237 236 0:62 / /sys/fs/cgroup rw,nosuid,nodev,noexec,relatime - tmpfs tmpfs rw
238 237 0:21 /system.slice/docker.service /sys/fs/cgroup/systemd rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd
239 237 0:23 /docker/dfac036ce135a8914e292cb2f6fea114f7339983c186366aa26d0051e93162cb /sys/fs/cgroup/perf_event rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,perf_event
240 237 0:24 /docker/dfac036ce135a8914e292cb2f6fea114f7339983c186366aa26d0051e93162cb /sys/fs/cgroup/cpuset rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,cpuset,clone_children
241 237 0:25 /docker/dfac036ce135a8914e292cb2f6fea114f7339983c186366aa26d0051e93162cb /sys/fs/cgroup/devices rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,devices
242 237 0:26 /docker/dfac036ce135a8914e292cb2f6fea114f7339983c186366aa26d0051e93162cb /sys/fs/cgroup/freezer rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,freezer
243 237 0:27 /docker/dfac036ce135a8914e292cb2f6fea114f7339983c186366aa26d0051e93162cb /sys/fs/cgroup/cpu,cpuacct rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,cpu,cpuacct
244 237 0:28 /docker/dfac036ce135a8914e292cb2f6fea114f7339983c186366aa26d0051e93162cb /sys/fs/cgroup/blkio rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,blkio
245 237 0:29 /docker/dfac036ce135a8914e292cb2f6fea114f7339983c186366aa26d0051e93162cb /sys/fs/cgroup/net_cls,net_prio rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,net_cls,net_prio
246 237 0:30 /docker/dfac036ce135a8914e292cb2f6fea114f7339983c186366aa26d0051e93162cb /sys/fs/cgroup/hugetlb rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,hugetlb
247 237 0:31 /docker/dfac036ce135a8914e292cb2f6fea114f7339983c186366aa26d0051e93162cb /sys/fs/cgroup/memory rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,memory
248 230 253:1 /var/lib/docker/volumes/510cc41ac68c48bd4eac932e3e09711673876287abf1b185312cfbfe6261a111/_data /var/lib/docker rw,relatime - ext4 /dev/disk/by-uuid/ba70ea0c-1a8f-4ee4-9687-cb393730e2b5 rw,errors=remount-ro,data=ordered
250 230 253:1 /var/lib/docker/containers/dfac036ce135a8914e292cb2f6fea114f7339983c186366aa26d0051e93162cb/hostname /etc/hostname rw,relatime - ext4 /dev/disk/by-uuid/ba70ea0c-1a8f-4ee4-9687-cb393730e2b5 rw,errors=remount-ro,data=ordered
251 230 253:1 /var/lib/docker/containers/dfac036ce135a8914e292cb2f6fea114f7339983c186366aa26d0051e93162cb/hosts /etc/hosts rw,relatime - ext4 /dev/disk/by-uuid/ba70ea0c-1a8f-4ee4-9687-cb393730e2b5 rw,errors=remount-ro,data=ordered
252 232 0:13 /1 /dev/console rw,nosuid,noexec,relatime - devpts devpts rw,gid=5,mode=620,ptmxmode=000
139 236 0:11 / /sys/kernel/security rw,relatime - securityfs none rw
140 230 0:54 / /tmp rw,relatime - tmpfs none rw
145 230 0:3 / /run/docker/netns/default rw - nsfs nsfs rw
130 140 0:45 / /tmp/docker_recursive_mount_test312125472/tmpfs rw,relatime - tmpfs tmpfs rw
131 230 0:3 / /run/docker/netns/47903e2e6701 rw - nsfs nsfs rw
133 230 0:55 / /go/src/github.com/docker/docker/bundles/1.9.0-dev/test-integration-cli/d45526097/graph/containers/47903e2e67014246eba27607809d5f5c2437c3bf84c2986393448f84093cc40b/mqueue rw,nosuid,nodev,noexec,relatime - mqueue mqueue rw`
d := &Daemon{
repository: "/go/src/github.com/docker/docker/bundles/1.9.0-dev/test-integration-cli/d45526097/graph/containers/",
}
expected := "/go/src/github.com/docker/docker/bundles/1.9.0-dev/test-integration-cli/d45526097/graph/containers/47903e2e67014246eba27607809d5f5c2437c3bf84c2986393448f84093cc40b/mqueue"
var unmounted bool
unmount := func(target string) error {
if target == expected {
unmounted = true
}
return nil
}
d.cleanupMountsFromReader(strings.NewReader(fixture), unmount)
if !unmounted {
t.Fatalf("Expected to unmount the mqueue")
}
}

6
integration-cli/docker_cli_daemon_test.go
View file

@ -1474,9 +1474,11 @@ func (s *DockerDaemonSuite) TestCleanupMountsAfterCrash(c *check.C) {
id := strings.TrimSpace(out)
c.Assert(s.d.cmd.Process.Signal(os.Kill), check.IsNil)
c.Assert(s.d.Start(), check.IsNil)
mountOut, err := exec.Command("mount").CombinedOutput()
mountOut, err := ioutil.ReadFile("/proc/self/mountinfo")
c.Assert(err, check.IsNil, check.Commentf("Output: %s", mountOut))
c.Assert(strings.Contains(string(mountOut), id), check.Equals, false, check.Commentf("Something mounted from older daemon start: %s", mountOut))
comment := check.Commentf("%s is still mounted from older daemon start:\nDaemon root repository %s\n%s", id, s.d.folder, mountOut)
c.Assert(strings.Contains(string(mountOut), id), check.Equals, false, comment)
}
func (s *DockerDaemonSuite) TestRunContainerWithBridgeNone(c *check.C) {