From 217f2e77f86c95babc9697545e8880af38ec2e89 Mon Sep 17 00:00:00 2001 From: Adrian Reber Date: Thu, 27 Jun 2019 06:16:32 +0000 Subject: Include root file-system changes in container migration One of the last limitations when migrating a container using Podman's 'podman container checkpoint --export=/path/to/archive.tar.gz' was that it was necessary to manually handle changes to the container's root file-system. The recommendation was to mount everything as --tmpfs where the root file-system was changed. This extends the checkpoint export functionality to also include all changes to the root file-system in the checkpoint archive. The checkpoint archive now includes a tarstream of the result from 'podman diff'. This tarstream will be applied to the restored container before restoring the container. With this any container can now be migrated, even it there are changes to the root file-system. There was some discussion before implementing this to base the root file-system migration on 'podman commit', but it seemed wrong to do a 'podman commit' before the migration as that would change the parent layer the restored container is referencing. Probably not really a problem, but it would have meant that a migrated container will always reference another storage top layer than it used to reference during initial creation. Signed-off-by: Adrian Reber --- pkg/adapter/checkpoint_restore.go | 1 + 1 file changed, 1 insertion(+) (limited to 'pkg') diff --git a/pkg/adapter/checkpoint_restore.go b/pkg/adapter/checkpoint_restore.go index 97ba5ecf7..1514a3414 100644 --- a/pkg/adapter/checkpoint_restore.go +++ b/pkg/adapter/checkpoint_restore.go @@ -55,6 +55,7 @@ func crImportCheckpoint(ctx context.Context, runtime *libpod.Runtime, input stri "checkpoint", "artifacts", "ctr.log", + "rootfs-diff.tar", "network.status", }, } -- cgit v1.2.3-54-g00ecf