This commit adds an option to the checkpoint command to export a
checkpoint into a tar.gz file as well as importing a checkpoint tar.gz
file during restore. With all checkpoint artifacts in one file it is
possible to easily transfer a checkpoint and thus enabling container
migration in Podman. With the following steps it is possible to migrate
a running container from one system (source) to another (destination).
Source system:
* podman container checkpoint -l -e /tmp/checkpoint.tar.gz
* scp /tmp/checkpoint.tar.gz destination:/tmp
Destination system:
* podman pull 'container-image-as-on-source-system'
* podman container restore -i /tmp/checkpoint.tar.gz
The exported tar.gz file contains the checkpoint image as created by
CRIU and a few additional JSON files describing the state of the
checkpointed container.
Now the container is running on the destination system with the same
state just as during checkpointing. If the container is kept running
on the source system with the checkpoint flag '-R', the result will be
that the same container is running on two different hosts.
Signed-off-by: Adrian Reber <areber@redhat.com>
This adds a couple of function in structure members needed in the next
commit to make container migration actually work. This just splits of
the function which are not modifying existing code.
Signed-off-by: Adrian Reber <areber@redhat.com>
after we read from the pause PID file, NUL terminate the buffer to
avoid reading garbage from the stack.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
the warning can be confusing when used in rootless mode as the
unprivileged user has no way for setting it up.
Closes: https://github.com/containers/libpod/issues/2955
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Rootless containers can't be paused (no CGroups, so no freezer).
We could try and emulate this with a SIGSTOP to all PIDs in the
container, but that's inherently racy, so let's avoid it for now.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
when doing localized tests (not varlink), we can use secondary image
stores as read-only image caches. this cuts down on test time
significantly because each test does not need to restore the images from
a tarball anymore.
Signed-off-by: baude <bbaude@redhat.com>
'docker cp' is an alias for 'docker container cp', and podman should have the equivalent alias.
Signed-off-by: Jose Diaz-Gonzalez <email@josediazgonzalez.com>
Although an upgraded call is requested, the server has to send at least
one reply (can be an error) and the client has to check the reply,
before assuming an upgraded connection.
Signed-off-by: Harald Hoyer <harald@redhat.com>
Also reorder the missing update command to better match the container update command (it is in the same management namespace)
Signed-off-by: Jose Diaz-Gonzalez <email@josediazgonzalez.com>
Adrian Reber
OpenShift Merge Robot
Marcus Müller
Giuseppe Scrivano
baude
Matthew Heon
Ashley Cui
Jose Diaz-Gonzalez
Daniel J Walsh
Harald Hoyer
Chris Evich
Peter Hunt