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Add support for checkpoint image

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This is an enhancement proposal for the checkpoint / restore feature of
Podman that enables container migration across multiple systems with
standard image distribution infrastructure.

A new option `--create-image <image>` has been added to the
`podman container checkpoint` command. This option tells Podman to
create a container image.  This is a standard image with a single layer,
tar archive, that that contains all checkpoint files. This is similar to
the current approach with checkpoint `--export`/`--import`.

This image can be pushed to a container registry and pulled on a
different system.  It can also be exported locally with `podman image
save` and inspected with `podman inspect`. Inspecting the image would
display additional information about the host and the versions of
Podman, criu, crun/runc, kernel, etc.

`podman container restore` has also been extended to support image
name or ID as input.

Suggested-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Radostin Stoyanov <radostin@redhat.com>
This commit is contained in:
Radostin Stoyanov
2022-04-12 18:46:32 +01:00
parent fca3397dc9
commit 756ecd5400
17 changed files with 533 additions and 68 deletions
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6
libpod/container_api.go
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@ -754,6 +754,9 @@ type ContainerCheckpointOptions struct {
// TargetFile tells the API to read (or write) the checkpoint image
// from (or to) the filename set in TargetFile
TargetFile string
// CheckpointImageID tells the API to restore the container from
// checkpoint image with ID set in CheckpointImageID
CheckpointImageID string
// Name tells the API that during restore from an exported
// checkpoint archive a new name should be used for the
// restored container
@ -781,6 +784,9 @@ type ContainerCheckpointOptions struct {
// ImportPrevious tells the API to restore container with two
// images. One is TargetFile, the other is ImportPrevious.
ImportPrevious string
// CreateImage tells Podman to create an OCI image from container
// checkpoint in the local image store.
CreateImage string
// Compression tells the API which compression to use for
// the exported checkpoint archive.
Compression archive.Compression