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We previously attempted to work within CNI to do this, without
success. So let's do it manually, instead. We know where the
files should live, so we can remove them ourselves instead. This
solves issues around sudden reboots where containers do not have
time to fully tear themselves down, and leave IP address
allocations which, for various reasons, are not stored in tmpfs
and persist through reboot.
Fixes #5433
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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Previously, `podman checkport restore` with exported containers,
when told to create a new container based on the exported
checkpoint, would create a new container, with a new container
ID, but not reset CGroup path - which contained the ID of the
original container.
If this was done multiple times, the result was two containers
with the same cgroup paths. Operations on these containers would
this have a chance of crossing over to affect the other one; the
most notable was `podman rm` once it was changed to use the --all
flag when stopping the container; all processes in the cgroup,
including the ones in the other container, would be stopped.
Reset cgroups on restore to ensure that the path matches the ID
of the container actually being run.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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CNI expects that a DELETE be run before re-creating container
networks. If a reboot occurs quickly enough that containers can't
stop and clean up, that DELETE never happens, and Podman
currently wipes the old network info and thinks the state has
been entirely cleared. Unfortunately, that may not be the case on
the CNI side. Some things - like IP address reservations - may
not have been cleared.
To solve this, manually re-run CNI Delete on refresh. If the
container has already been deleted this seems harmless. If not,
it should clear lingering state.
Fixes: #3759
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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the compilation demands of having libpod in main is a burden for the
remote client compilations. to combat this, we should move the use of
libpod structs, vars, constants, and functions into the adapter code
where it will only be compiled by the local client.
this should result in cleaner code organization and smaller binaries. it
should also help if we ever need to compile the remote client on
non-Linux operating systems natively (not cross-compiled).
Signed-off-by: baude <bbaude@redhat.com>
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When creating a new image volume to be mounted into a container, we need to
make sure the new volume matches the Ownership and permissions of the path
that it will be mounted on.
For example if a volume inside of a containre image is owned by the database
UID, we want the volume to be mounted onto the image to be owned by the
database UID.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
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Unrelated to the rest of the PR.
Signed-off-by: Miloslav Trmač <mitr@redhat.com>
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runc uses CRIU to support checkpoint and restore of containers. This
brings an initial checkpoint/restore implementation to podman.
None of the additional runc flags are yet supported and container
migration optimization (pre-copy/post-copy) is also left for the future.
The current status is that it is possible to checkpoint and restore a
container. I am testing on RHEL-7.x and as the combination of RHEL-7 and
CRIU has seccomp troubles I have to create the container without
seccomp.
With the following steps I am able to checkpoint and restore a
container:
# podman run --security-opt="seccomp=unconfined" -d registry.fedoraproject.org/f27/httpd
# curl -I 10.22.0.78:8080
HTTP/1.1 403 Forbidden # <-- this is actually a good answer
# podman container checkpoint <container>
# curl -I 10.22.0.78:8080
curl: (7) Failed connect to 10.22.0.78:8080; No route to host
# podman container restore <container>
# curl -I 10.22.0.78:8080
HTTP/1.1 403 Forbidden
I am using CRIU, runc and conmon from git. All required changes for
checkpoint/restore support in podman have been merged in the
corresponding projects.
To have the same IP address in the restored container as before
checkpointing, CNI is told which IP address to use.
If the saved network configuration cannot be found during restore, the
container is restored with a new IP address.
For CRIU to restore established TCP connections the IP address of the
network namespace used for restore needs to be the same. For TCP
connections in the listening state the IP address can change.
During restore only one network interface with one IP address is handled
correctly. Support to restore containers with more advanced network
configuration will be implemented later.
v2:
* comment typo
* print debug messages during cleanup of restore files
* use createContainer() instead of createOCIContainer()
* introduce helper CheckpointPath()
* do not try to restore a container that is paused
* use existing helper functions for cleanup
* restructure code flow for better readability
* do not try to restore if checkpoint/inventory.img is missing
* git add checkpoint.go restore.go
v3:
* move checkpoint/restore under 'podman container'
v4:
* incorporated changes from latest reviews
Signed-off-by: Adrian Reber <areber@redhat.com>
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Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
Closes: #1051
Approved by: umohnani8
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this should represent the last major changes to get darwin to **compile**. again,
the purpose here is to get darwin to compile so that we can eventually implement a
ci task that would protect against regressions for darwin compilation.
i have left the manual darwin compilation largely static still and in fact now only
interject (manually) two build tags to assist with the build. trevor king has great
ideas on how to make this better and i will defer final implementation of those
to him.
Signed-off-by: baude <bbaude@redhat.com>
Closes: #1047
Approved by: rhatdan
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Signed-off-by: baude <bbaude@redhat.com>
Closes: #1015
Approved by: baude
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