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-rw-r--r--cmd/podman/checkpoint.go73
-rw-r--r--cmd/podman/container.go2
-rw-r--r--cmd/podman/restore.go73
-rw-r--r--libpod/container_api.go30
-rw-r--r--libpod/container_internal.go7
-rw-r--r--libpod/container_internal_linux.go158
-rw-r--r--libpod/container_internal_unsupported.go8
-rw-r--r--libpod/oci.go18
-rw-r--r--libpod/oci_linux.go6
-rw-r--r--libpod/oci_unsupported.go2
10 files changed, 371 insertions, 6 deletions
diff --git a/cmd/podman/checkpoint.go b/cmd/podman/checkpoint.go
new file mode 100644
index 000000000..cbbbcd740
--- /dev/null
+++ b/cmd/podman/checkpoint.go
@@ -0,0 +1,73 @@
+package main
+
+import (
+ "context"
+ "fmt"
+ "os"
+
+ "github.com/containers/libpod/cmd/podman/libpodruntime"
+ "github.com/containers/libpod/pkg/rootless"
+ "github.com/pkg/errors"
+ "github.com/urfave/cli"
+)
+
+var (
+ checkpointDescription = `
+ podman container checkpoint
+
+ Checkpoints one or more running containers. The container name or ID can be used.
+`
+ checkpointFlags = []cli.Flag{
+ cli.BoolFlag{
+ Name: "keep, k",
+ Usage: "keep all temporary checkpoint files",
+ },
+ }
+ checkpointCommand = cli.Command{
+ Name: "checkpoint",
+ Usage: "Checkpoints one or more containers",
+ Description: checkpointDescription,
+ Flags: checkpointFlags,
+ Action: checkpointCmd,
+ ArgsUsage: "CONTAINER-NAME [CONTAINER-NAME ...]",
+ }
+)
+
+func checkpointCmd(c *cli.Context) error {
+ if rootless.IsRootless() {
+ return errors.New("checkpointing a container requires root")
+ }
+
+ runtime, err := libpodruntime.GetRuntime(c)
+ if err != nil {
+ return errors.Wrapf(err, "could not get runtime")
+ }
+ defer runtime.Shutdown(false)
+
+ keep := c.Bool("keep")
+ args := c.Args()
+ if len(args) < 1 {
+ return errors.Errorf("you must provide at least one container name or id")
+ }
+
+ var lastError error
+ for _, arg := range args {
+ ctr, err := runtime.LookupContainer(arg)
+ if err != nil {
+ if lastError != nil {
+ fmt.Fprintln(os.Stderr, lastError)
+ }
+ lastError = errors.Wrapf(err, "error looking up container %q", arg)
+ continue
+ }
+ if err = ctr.Checkpoint(context.TODO(), keep); err != nil {
+ if lastError != nil {
+ fmt.Fprintln(os.Stderr, lastError)
+ }
+ lastError = errors.Wrapf(err, "failed to checkpoint container %v", ctr.ID())
+ } else {
+ fmt.Println(ctr.ID())
+ }
+ }
+ return lastError
+}
diff --git a/cmd/podman/container.go b/cmd/podman/container.go
index 82c1c824d..ff634278f 100644
--- a/cmd/podman/container.go
+++ b/cmd/podman/container.go
@@ -7,6 +7,7 @@ import (
var (
subCommands = []cli.Command{
attachCommand,
+ checkpointCommand,
cleanupCommand,
commitCommand,
createCommand,
@@ -23,6 +24,7 @@ var (
// pruneCommand,
refreshCommand,
restartCommand,
+ restoreCommand,
rmCommand,
runCommand,
runlabelCommand,
diff --git a/cmd/podman/restore.go b/cmd/podman/restore.go
new file mode 100644
index 000000000..43ef87ca2
--- /dev/null
+++ b/cmd/podman/restore.go
@@ -0,0 +1,73 @@
+package main
+
+import (
+ "context"
+ "fmt"
+ "os"
+
+ "github.com/containers/libpod/cmd/podman/libpodruntime"
+ "github.com/containers/libpod/pkg/rootless"
+ "github.com/pkg/errors"
+ "github.com/urfave/cli"
+)
+
+var (
+ restoreDescription = `
+ podman container restore
+
+ Restores a container from a checkpoint. The container name or ID can be used.
+`
+ restoreFlags = []cli.Flag{
+ cli.BoolFlag{
+ Name: "keep, k",
+ Usage: "keep all temporary checkpoint files",
+ },
+ }
+ restoreCommand = cli.Command{
+ Name: "restore",
+ Usage: "Restores one or more containers from a checkpoint",
+ Description: restoreDescription,
+ Flags: restoreFlags,
+ Action: restoreCmd,
+ ArgsUsage: "CONTAINER-NAME [CONTAINER-NAME ...]",
+ }
+)
+
+func restoreCmd(c *cli.Context) error {
+ if rootless.IsRootless() {
+ return errors.New("restoring a container requires root")
+ }
+
+ runtime, err := libpodruntime.GetRuntime(c)
+ if err != nil {
+ return errors.Wrapf(err, "could not get runtime")
+ }
+ defer runtime.Shutdown(false)
+
+ keep := c.Bool("keep")
+ args := c.Args()
+ if len(args) < 1 {
+ return errors.Errorf("you must provide at least one container name or id")
+ }
+
+ var lastError error
+ for _, arg := range args {
+ ctr, err := runtime.LookupContainer(arg)
+ if err != nil {
+ if lastError != nil {
+ fmt.Fprintln(os.Stderr, lastError)
+ }
+ lastError = errors.Wrapf(err, "error looking up container %q", arg)
+ continue
+ }
+ if err = ctr.Restore(context.TODO(), keep); err != nil {
+ if lastError != nil {
+ fmt.Fprintln(os.Stderr, lastError)
+ }
+ lastError = errors.Wrapf(err, "failed to restore container %v", ctr.ID())
+ } else {
+ fmt.Println(ctr.ID())
+ }
+ }
+ return lastError
+}
diff --git a/libpod/container_api.go b/libpod/container_api.go
index 192ccd347..93becb80d 100644
--- a/libpod/container_api.go
+++ b/libpod/container_api.go
@@ -832,3 +832,33 @@ func (c *Container) Refresh(ctx context.Context) error {
return nil
}
+
+// Checkpoint checkpoints a container
+func (c *Container) Checkpoint(ctx context.Context, keep bool) error {
+ logrus.Debugf("Trying to checkpoint container %s", c)
+ if !c.batched {
+ c.lock.Lock()
+ defer c.lock.Unlock()
+
+ if err := c.syncContainer(); err != nil {
+ return err
+ }
+ }
+
+ return c.checkpoint(ctx, keep)
+}
+
+// Restore restores a container
+func (c *Container) Restore(ctx context.Context, keep bool) (err error) {
+ logrus.Debugf("Trying to restore container %s", c)
+ if !c.batched {
+ c.lock.Lock()
+ defer c.lock.Unlock()
+
+ if err := c.syncContainer(); err != nil {
+ return err
+ }
+ }
+
+ return c.restore(ctx, keep)
+}
diff --git a/libpod/container_internal.go b/libpod/container_internal.go
index 033426817..c925f070b 100644
--- a/libpod/container_internal.go
+++ b/libpod/container_internal.go
@@ -129,6 +129,11 @@ func (c *Container) ControlSocketPath() string {
return filepath.Join(c.bundlePath(), "ctl")
}
+// CheckpointPath returns the path to the directory containing the checkpoint
+func (c *Container) CheckpointPath() string {
+ return filepath.Join(c.bundlePath(), "checkpoint")
+}
+
// AttachSocketPath retrieves the path of the container's attach socket
func (c *Container) AttachSocketPath() string {
return filepath.Join(c.runtime.ociRuntime.socketsDir, c.ID(), "attach")
@@ -523,7 +528,7 @@ func (c *Container) init(ctx context.Context) error {
}
// With the spec complete, do an OCI create
- if err := c.runtime.ociRuntime.createContainer(c, c.config.CgroupParent); err != nil {
+ if err := c.runtime.ociRuntime.createContainer(c, c.config.CgroupParent, false); err != nil {
return err
}
diff --git a/libpod/container_internal_linux.go b/libpod/container_internal_linux.go
index b77beaf64..0353124dd 100644
--- a/libpod/container_internal_linux.go
+++ b/libpod/container_internal_linux.go
@@ -4,12 +4,18 @@ package libpod
import (
"context"
+ "encoding/json"
"fmt"
+ "io/ioutil"
+ "net"
+ "os"
"path"
+ "path/filepath"
"strings"
"syscall"
"time"
+ cnitypes "github.com/containernetworking/cni/pkg/types/current"
crioAnnotations "github.com/containers/libpod/pkg/annotations"
"github.com/containers/libpod/pkg/chrootuser"
"github.com/containers/libpod/pkg/rootless"
@@ -307,3 +313,155 @@ func (c *Container) addNamespaceContainer(g *generate.Generator, ns LinuxNS, ctr
return nil
}
+
+func (c *Container) checkpoint(ctx context.Context, keep bool) (err error) {
+
+ if c.state.State != ContainerStateRunning {
+ return errors.Wrapf(ErrCtrStateInvalid, "%q is not running, cannot checkpoint", c.state.State)
+ }
+ if err := c.runtime.ociRuntime.checkpointContainer(c); err != nil {
+ return err
+ }
+
+ // Save network.status. This is needed to restore the container with
+ // the same IP. Currently limited to one IP address in a container
+ // with one interface.
+ formatJSON, err := json.MarshalIndent(c.state.NetworkStatus, "", " ")
+ if err != nil {
+ return err
+ }
+ if err := ioutil.WriteFile(filepath.Join(c.bundlePath(), "network.status"), formatJSON, 0644); err != nil {
+ return err
+ }
+
+ logrus.Debugf("Checkpointed container %s", c.ID())
+
+ c.state.State = ContainerStateStopped
+
+ // Cleanup Storage and Network
+ if err := c.cleanup(ctx); err != nil {
+ return err
+ }
+
+ if !keep {
+ // Remove log file
+ os.Remove(filepath.Join(c.bundlePath(), "dump.log"))
+ // Remove statistic file
+ os.Remove(filepath.Join(c.bundlePath(), "stats-dump"))
+ }
+
+ return c.save()
+}
+
+func (c *Container) restore(ctx context.Context, keep bool) (err error) {
+
+ if (c.state.State != ContainerStateConfigured) && (c.state.State != ContainerStateExited) {
+ return errors.Wrapf(ErrCtrStateInvalid, "container %s is running or paused, cannot restore", c.ID())
+ }
+
+ // Let's try to stat() CRIU's inventory file. If it does not exist, it makes
+ // no sense to try a restore. This is a minimal check if a checkpoint exist.
+ if _, err := os.Stat(filepath.Join(c.CheckpointPath(), "inventory.img")); os.IsNotExist(err) {
+ return errors.Wrapf(err, "A complete checkpoint for this container cannot be found, cannot restore")
+ }
+
+ // Read network configuration from checkpoint
+ // Currently only one interface with one IP is supported.
+ networkStatusFile, err := os.Open(filepath.Join(c.bundlePath(), "network.status"))
+ if err == nil {
+ // The file with the network.status does exist. Let's restore the
+ // container with the same IP address as during checkpointing.
+ defer networkStatusFile.Close()
+ var networkStatus []*cnitypes.Result
+ networkJSON, err := ioutil.ReadAll(networkStatusFile)
+ if err != nil {
+ return err
+ }
+ json.Unmarshal(networkJSON, &networkStatus)
+ // Take the first IP address
+ var IP net.IP
+ if len(networkStatus) > 0 {
+ if len(networkStatus[0].IPs) > 0 {
+ IP = networkStatus[0].IPs[0].Address.IP
+ }
+ }
+ if IP != nil {
+ env := fmt.Sprintf("IP=%s", IP)
+ // Tell CNI which IP address we want.
+ os.Setenv("CNI_ARGS", env)
+ logrus.Debugf("Restoring container with %s", env)
+ }
+ }
+
+ if err := c.prepare(); err != nil {
+ return err
+ }
+ defer func() {
+ if err != nil {
+ if err2 := c.cleanup(ctx); err2 != nil {
+ logrus.Errorf("error cleaning up container %s: %v", c.ID(), err2)
+ }
+ }
+ }()
+
+ // TODO: use existing way to request static IPs, once it is merged in ocicni
+ // https://github.com/cri-o/ocicni/pull/23/
+
+ // CNI_ARGS was used to request a certain IP address. Unconditionally remove it.
+ os.Unsetenv("CNI_ARGS")
+
+ // Read config
+ jsonPath := filepath.Join(c.bundlePath(), "config.json")
+ logrus.Debugf("generate.NewFromFile at %v", jsonPath)
+ g, err := generate.NewFromFile(jsonPath)
+ if err != nil {
+ logrus.Debugf("generate.NewFromFile failed with %v", err)
+ return err
+ }
+
+ // We want to have the same network namespace as before.
+ if c.config.CreateNetNS {
+ g.AddOrReplaceLinuxNamespace(spec.NetworkNamespace, c.state.NetNS.Path())
+ }
+
+ // Save the OCI spec to disk
+ if err := c.saveSpec(g.Spec()); err != nil {
+ return err
+ }
+
+ if err := c.makeBindMounts(); err != nil {
+ return err
+ }
+
+ // Cleanup for a working restore.
+ c.removeConmonFiles()
+
+ if err := c.runtime.ociRuntime.createContainer(c, c.config.CgroupParent, true); err != nil {
+ return err
+ }
+
+ logrus.Debugf("Restored container %s", c.ID())
+
+ c.state.State = ContainerStateRunning
+
+ if !keep {
+ // Delete all checkpoint related files. At this point, in theory, all files
+ // should exist. Still ignoring errors for now as the container should be
+ // restored and running. Not erroring out just because some cleanup operation
+ // failed. Starting with the checkpoint directory
+ err = os.RemoveAll(c.CheckpointPath())
+ if err != nil {
+ logrus.Debugf("Non-fatal: removal of checkpoint directory (%s) failed: %v", c.CheckpointPath(), err)
+ }
+ cleanup := [...]string{"restore.log", "dump.log", "stats-dump", "stats-restore", "network.status"}
+ for _, delete := range cleanup {
+ file := filepath.Join(c.bundlePath(), delete)
+ err = os.Remove(file)
+ if err != nil {
+ logrus.Debugf("Non-fatal: removal of checkpoint file (%s) failed: %v", file, err)
+ }
+ }
+ }
+
+ return c.save()
+}
diff --git a/libpod/container_internal_unsupported.go b/libpod/container_internal_unsupported.go
index 45b54efab..eed0449a9 100644
--- a/libpod/container_internal_unsupported.go
+++ b/libpod/container_internal_unsupported.go
@@ -27,3 +27,11 @@ func (c *Container) cleanupNetwork() error {
func (c *Container) generateSpec(ctx context.Context) (*spec.Spec, error) {
return nil, ErrNotImplemented
}
+
+func (c *Container) checkpoint(ctx context.Context, keep bool) error {
+ return ErrNotImplemented
+}
+
+func (c *Container) restore(ctx context.Context, keep bool) error {
+ return ErrNotImplemented
+}
diff --git a/libpod/oci.go b/libpod/oci.go
index e5db06540..cf2b76ab0 100644
--- a/libpod/oci.go
+++ b/libpod/oci.go
@@ -227,7 +227,7 @@ func bindPorts(ports []ocicni.PortMapping) ([]*os.File, error) {
return files, nil
}
-func (r *OCIRuntime) createOCIContainer(ctr *Container, cgroupParent string) (err error) {
+func (r *OCIRuntime) createOCIContainer(ctr *Container, cgroupParent string, restoreContainer bool) (err error) {
var stderrBuf bytes.Buffer
runtimeDir, err := GetRootlessRuntimeDir()
@@ -289,6 +289,10 @@ func (r *OCIRuntime) createOCIContainer(ctr *Container, cgroupParent string) (er
args = append(args, "--syslog")
}
+ if restoreContainer {
+ args = append(args, "--restore", ctr.CheckpointPath())
+ }
+
logrus.WithFields(logrus.Fields{
"args": args,
}).Debugf("running conmon: %s", r.conmonPath)
@@ -766,3 +770,15 @@ func (r *OCIRuntime) execStopContainer(ctr *Container, timeout uint) error {
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())
+}
diff --git a/libpod/oci_linux.go b/libpod/oci_linux.go
index 210ba57d1..0447670b3 100644
--- a/libpod/oci_linux.go
+++ b/libpod/oci_linux.go
@@ -63,10 +63,10 @@ func newPipe() (parent *os.File, child *os.File, err error) {
// CreateContainer creates a container in the OCI runtime
// TODO terminal support for container
// Presently just ignoring conmon opts related to it
-func (r *OCIRuntime) createContainer(ctr *Container, cgroupParent string) (err error) {
+func (r *OCIRuntime) createContainer(ctr *Container, cgroupParent string, restoreContainer bool) (err error) {
if ctr.state.UserNSRoot == "" {
// no need of an intermediate mount ns
- return r.createOCIContainer(ctr, cgroupParent)
+ return r.createOCIContainer(ctr, cgroupParent, restoreContainer)
}
var wg sync.WaitGroup
wg.Add(1)
@@ -103,7 +103,7 @@ func (r *OCIRuntime) createContainer(ctr *Container, cgroupParent string) (err e
if err != nil {
return
}
- err = r.createOCIContainer(ctr, cgroupParent)
+ err = r.createOCIContainer(ctr, cgroupParent, restoreContainer)
}()
wg.Wait()
diff --git a/libpod/oci_unsupported.go b/libpod/oci_unsupported.go
index 8cb4994d3..b133eb402 100644
--- a/libpod/oci_unsupported.go
+++ b/libpod/oci_unsupported.go
@@ -15,7 +15,7 @@ func newPipe() (parent *os.File, child *os.File, err error) {
return nil, nil, ErrNotImplemented
}
-func (r *OCIRuntime) createContainer(ctr *Container, cgroupParent string) (err error) {
+func (r *OCIRuntime) createContainer(ctr *Container, cgroupParent string, restoreContainer bool) (err error) {
return ErrNotImplemented
}
generated by cgit v1.2.3-54-g00ecf (git 2.39.0) at 2024-11-06 11:32:51 +0000