Adrian Reber 3257cd2911 Introducing the --check-only option ... Talking about criu a common question is, if it is possible to know if a checkpoint and restore will actually work. Running 'criu dump' with --leave-running to see if the checkpointing will work and then running 'criu restore' is always an option. If one of those operations (either 'dump' or 'restore') will fail the chances are high that there are problems with checkpointing or restoring. But a lot of memory might have already been dumped to disk and transferred to the destination system which is not necessary to test for a restore failure. If the restore, however, works the problem exists that the source process has been told to keep on running (--leave-running) which might be an undesired situation to have the process now running on the source and destination system. To avoid a situation like this and to give an easier option to test if 'criu dump' and 'criu restore' will work, this patch introduces the '--check-only' option: source system: # criu dump --check-only -D /tmp/cp -t <PID> Only checking if requested operation will succeed # rsync -a /tmp/cp dest-system:/tmp destination system: # criu restore -D /tmp/cp Checking mode enabled criu will detect if a checkpoint is a 'check-only' checkpoint and the restore will automatically run in '--check-only' mode. It is also possible to use the '--check-only' switch on a full checkpoint to see if the restore will succeed and making sure at the same time that the process will not start running: destination system: # criu restore --check-only -D /tmp/cp Only checking if requested operation will succeed Checking mode enabled Right now only the existing checks (e.g., check binary size) are run in 'check-only' mode but additional checks could be added like: * checksums of binaries * checksums of used libraries * available memory v2: - changes based on Pavel's review Signed-off-by: Adrian Reber <areber@redhat.com> Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com> Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>		2017-11-30 01:18:53 +03:00
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.gitattributes	docs: Initial commit	2012-01-29 00:09:32 +04:00
.gitignore	.gitignore: update to recent changes	2017-03-14 21:03:22 +03:00
asciidoc.conf	docs: Initial commit	2012-01-29 00:09:32 +04:00
crit.txt	crit: added crit manpage	2016-12-12 11:34:22 +03:00
criu.txt	Introducing the --check-only option	2017-11-30 01:18:53 +03:00
custom.xsl	Documentation: enable monospaced font in PS/PDF	2016-09-27 17:06:02 +03:00
HOWTO.cross-compile	Documentation: remove the linker command line switch --static from the final step described in the cross-compilation guide	2014-03-11 22:47:38 +04:00
Makefile	crit: added crit manpage	2016-12-12 11:34:22 +03:00