From 288ccc4c84e917df0ff0ee659f47e3ecbc87796a Mon Sep 17 00:00:00 2001 From: Radostin Stoyanov Date: Fri, 18 Dec 2020 20:07:08 +0000 Subject: Include named volumes in container migration When migrating a container with associated volumes, the content of these volumes should be made available on the destination machine. This patch enables container checkpoint/restore with named volumes by including the content of volumes in checkpoint file. On restore, volumes associated with container are created and their content is restored. The --ignore-volumes option is introduced to disable this feature. Example: # podman container checkpoint --export checkpoint.tar.gz The content of all volumes associated with the container are included in `checkpoint.tar.gz` # podman container checkpoint --export checkpoint.tar.gz --ignore-volumes The content of volumes is not included in `checkpoint.tar.gz`. This is useful, for example, when the checkpoint/restore is performed on the same machine. # podman container restore --import checkpoint.tar.gz The associated volumes will be created and their content will be restored. Podman will exit with an error if volumes with the same name already exist on the system or the content of volumes is not included in checkpoint.tar.gz # podman container restore --ignore-volumes --import checkpoint.tar.gz Volumes associated with container must already exist. Podman will not create them or restore their content. Signed-off-by: Radostin Stoyanov --- cmd/podman/containers/checkpoint.go | 4 ++++ cmd/podman/containers/restore.go | 4 ++++ 2 files changed, 8 insertions(+) (limited to 'cmd') diff --git a/cmd/podman/containers/checkpoint.go b/cmd/podman/containers/checkpoint.go index b6dc21348..4a477eb10 100644 --- a/cmd/podman/containers/checkpoint.go +++ b/cmd/podman/containers/checkpoint.go @@ -57,6 +57,7 @@ func init() { _ = checkpointCommand.RegisterFlagCompletionFunc(exportFlagName, completion.AutocompleteDefault) flags.BoolVar(&checkpointOptions.IgnoreRootFS, "ignore-rootfs", false, "Do not include root file-system changes when exporting") + flags.BoolVar(&checkpointOptions.IgnoreVolumes, "ignore-volumes", false, "Do not export volumes associated with container") validate.AddLatestFlag(checkpointCommand, &checkpointOptions.Latest) } @@ -68,6 +69,9 @@ func checkpoint(cmd *cobra.Command, args []string) error { if checkpointOptions.Export == "" && checkpointOptions.IgnoreRootFS { return errors.Errorf("--ignore-rootfs can only be used with --export") } + if checkpointOptions.Export == "" && checkpointOptions.IgnoreVolumes { + return errors.Errorf("--ignore-volumes can only be used with --export") + } responses, err := registry.ContainerEngine().ContainerCheckpoint(context.Background(), args, checkpointOptions) if err != nil { return err diff --git a/cmd/podman/containers/restore.go b/cmd/podman/containers/restore.go index 6a1d2b319..5245a68fa 100644 --- a/cmd/podman/containers/restore.go +++ b/cmd/podman/containers/restore.go @@ -62,6 +62,7 @@ func init() { flags.BoolVar(&restoreOptions.IgnoreRootFS, "ignore-rootfs", false, "Do not apply root file-system changes when importing from exported checkpoint") flags.BoolVar(&restoreOptions.IgnoreStaticIP, "ignore-static-ip", false, "Ignore IP address set via --static-ip") flags.BoolVar(&restoreOptions.IgnoreStaticMAC, "ignore-static-mac", false, "Ignore MAC address set via --mac-address") + flags.BoolVar(&restoreOptions.IgnoreVolumes, "ignore-volumes", false, "Do not export volumes associated with container") validate.AddLatestFlag(restoreCommand, &restoreOptions.Latest) } @@ -73,6 +74,9 @@ func restore(_ *cobra.Command, args []string) error { if restoreOptions.Import == "" && restoreOptions.IgnoreRootFS { return errors.Errorf("--ignore-rootfs can only be used with --import") } + if restoreOptions.Import == "" && restoreOptions.IgnoreVolumes { + return errors.Errorf("--ignore-volumes can only be used with --import") + } if restoreOptions.Import == "" && restoreOptions.Name != "" { return errors.Errorf("--name can only be used with --import") } -- cgit v1.2.3-54-g00ecf