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path: root/libpod/container_internal.go
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* Add ensureState helper for checking container stateMatthew Heon2019-10-28
| | | | | | | | | | | | | | | | We have a lot of checks for container state scattered throughout libpod. Many of these need to ensure the container is in one of a given set of states so an operation may safely proceed. Previously there was no set way of doing this, so we'd use unique boolean logic for each one. Introduce a helper to standardize state checks. Note that this is only intended to replace checks for multiple states. A simple check for one state (ContainerStateRunning, for example) should remain a straight equality, and not use this new helper. Signed-off-by: Matthew Heon <mheon@redhat.com>
* Add a MissingRuntime implementationMatthew Heon2019-10-15
| | | | | | | | | | | | | | | | | When a container is created with a given OCI runtime, but then it is uninstalled or removed from the configuration file, Libpod presently reacts very poorly. The EvictContainer code can potentially remove these containers, but we still can't see them in `podman ps` (aside from the massive logrus.Errorf messages they create). Providing a minimal OCI runtime implementation for missing runtimes allows us to behave better. We'll be able to retrieve containers from the database, though we still pop up an error for each missing runtime. For containers which are stopped, we can remove them as normal. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Unwrap errors before comparing themNalin Dahyabhai2019-10-14
| | | | | | | Unwrap errors before directly comparing them with errors defined by the storage and image libraries. Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>
* Move OCI runtime implementation behind an interfaceMatthew Heon2019-10-10
| | | | | | | | | | | | For future work, we need multiple implementations of the OCI runtime, not just a Conmon-wrapped runtime matching the runc CLI. As part of this, do some refactoring on the interface for exec (move to a struct, not a massive list of arguments). Also, add 'all' support to Kill and Stop (supported by runc and used a bit internally for removing containers). Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* catch runc v2 errorbaude2019-10-09
| | | | | | | when runc returns an error about not being v2 complient, catch the error and logrus an actionable message for users. Signed-off-by: baude <bbaude@redhat.com>
* rootless: do not attempt a CNI refreshGiuseppe Scrivano2019-10-01
| | | | Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* Merge pull request #4065 from mheon/unconditional_conmon_rmOpenShift Merge Robot2019-09-27
|\ | | | | Unconditionally remove conmon files before starting
| * Unconditionally remove conmon files before startingMatthew Heon2019-09-20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We've been seeing a lot of issues (ref: #4061, but there are others) where Podman hiccups on trying to start a container, because some temporary files have been retained and Conmon will not overwrite them. If we're calling start() we can safely assume that we really want those files gone so the container starts without error, so invoke the cleanup routine. It's relatively cheap (four file removes) so it shouldn't hurt us that much. Also contains a small simplification to the removeConmonFiles logic - we don't need to stat-then-remove when ignoring ENOENT is fine. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* | Force a CNI Delete on refreshing containersMatthew Heon2019-09-24
|/ | | | | | | | | | | | | | | | | | 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>
* Unmounting a container that is already unmounted is OKMatthew Heon2019-09-16
| | | | | | | | | | | | We should not be throwing errors because the operation we wanted to perform is already done. Now, it is definitely strange that a container is actually unmounted, but shows as mounted in the DB - if this reoccurs in a way where we can investigate, it's worth tearing into. Fixes #4033 Signed-off-by: Matthew Heon <mheon@redhat.com>
* Report errors when trying to pause rootless containersDaniel J Walsh2019-09-13
| | | | | | | | If you are running a rootless container on cgroupV1 you can not pause the container. We need to report the proper error if this happens. Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
* clean up after healthcheck execsbaude2019-09-12
| | | | | | | | | | when executing a healthcheck, we were not cleaning up after exec's use of a socket. we now remove the socket file and ignore if for reason it does not exist. Fixes: #3962 Signed-off-by: baude <bbaude@redhat.com>
* Merge pull request #3581 from mheon/no_cgroupsOpenShift Merge Robot2019-09-11
|\ | | | | Support running containers without CGroups
| * Add support for launching containers without CGroupsMatthew Heon2019-09-10
| | | | | | | | | | | | | | This is mostly used with Systemd, which really wants to manage CGroups itself when managing containers via unit file. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* | When first mounting any named volume, copy upMatthew Heon2019-09-09
|/ | | | | | | | | | | Previously, we only did this for volumes created at the same time as the container. However, this is not correct behavior - Docker does so for all named volumes, even those made with 'podman volume create' and mounted into a container later. Fixes #3945 Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Correctly report errors on unmounting SHMMatthew Heon2019-09-05
| | | | | | | | | | | When we fail to remove a container's SHM, that's an error, and we need to report it as such. This may be part of our lingering storage woes. Also, remove MNT_DETACH. It may be another cause of the storage removal failures. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Add ability for volumes with options to mount/umountMatthew Heon2019-09-05
| | | | | | | | | | | | | When volume options and the local volume driver are specified, the volume is intended to be mounted using the 'mount' command. Supported options will be used to volume the volume before the first container using it starts, and unmount the volume after the last container using it dies. This should work for any local filesystem, though at present I've only tested with tmpfs and btrfs. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* generate systemd: support pods and geneartig filesValentin Rothberg2019-08-21
| | | | | | | | | | | Support generating systemd unit files for a pod. Podman generates one unit file for the pod including the PID file for the infra container's conmon process and one unit file for each container (excluding the infra container). Note that this change implies refactorings in the `pkg/systemdgen` API. Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
* container stop: kill conmonValentin Rothberg2019-08-05
| | | | | | | | | | | | | Old versions of conmon have a bug where they create the exit file before closing open file descriptors causing a race condition when restarting containers with open ports since we cannot bind the ports as they're not yet closed by conmon. Killing the old conmon PID is ~okay since it forces the FDs of old conmons to be closed, while it's a NOP for newer versions which should have exited already. Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
* Ensure we generate a 'stopped' event on force-removeMatthew Heon2019-07-31
| | | | | | | | | | | | | | When forcibly removing a container, we are initiating an explicit stop of the container, which is not reflected in 'podman events'. Swap to using our standard 'stop()' function instead of a custom one for force-remove, and move the event into the internal stop function (so internal calls also register it). This does add one more database save() to `podman remove`. This should not be a terribly serious performance hit, and does have the desirable side effect of making things generally safer. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* podman: fix memleak caused by renaming and not deletingMatthew Heon2019-07-31
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | the exit file If the container exit code needs to be retained, it cannot be retained in tmpfs, because libpod runs in a memcg itself so it can't leave traces with a daemon-less design. This wasn't a memleak detectable by kmemleak for example. The kernel never lost track of the memory and there was no erroneous refcounting either. The reference count dependencies however are not easy to track because when a refcount is increased, there's no way to tell who's still holding the reference. In this case it was a single page of tmpfs pagecache holding a refcount that kept pinned a whole hierarchy of dying memcg, slab kmem, cgropups, unrechable kernfs nodes and the respective dentries and inodes. Such a problem wouldn't happen if the exit file was stored in a regular filesystem because the pagecache could be reclaimed in such case under memory pressure. The tmpfs page can be swapped out, but that's not enough to release the memcg with CONFIG_MEMCG_SWAP_ENABLED=y. No amount of more aggressive kernel slab shrinking could have solved this. Not even assigning slab kmem of dying cgroups to alive cgroup would fully solve this. The only way to free the memory of a dying cgroup when a struct page still references it, would be to loop over all "struct page" in the kernel to find which one is associated with the dying cgroup which is a O(N) operation (where N is the number of pages and can reach billions). Linking all the tmpfs pages to the memcg would cost less during memcg offlining, but it would waste lots of memory and CPU globally. So this can't be optimized in the kernel. A cronjob running this command can act as workaround and will allow all slab cache to be released, not just the single tmpfs pages. rm -f /run/libpod/exits/* This patch solved the memleak with a reproducer, booting with cgroup.memory=nokmem and with selinux disabled. The reason memcg kmem and selinux were disabled for testing of this fix, is because kmem greatly decreases the kernel effectiveness in reusing partial slab objects. cgroup.memory=nokmem is strongly recommended at least for workstation usage. selinux needs to be further analyzed because it causes further slab allocations. The upstream podman commit used for testing is 1fe2965e4f672674f7b66648e9973a0ed5434bb4 (v1.4.4). The upstream kernel commit used for testing is f16fea666898dbdd7812ce94068c76da3e3fcf1e (v5.2-rc6). Reported-by: Michele Baldessari <michele@redhat.com> Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> <Applied with small tweaks to comments> Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Merge pull request #3233 from ↵OpenShift Merge Robot2019-07-29
|\ | | | | | | | | wking/fatal-requested-hook-directory-does-not-exist libpod/container_internal: Make all errors loading explicitly configured hook dirs fatal
| * libpod/container_internal: Make all errors loading explicitly configured ↵W. Trevor King2019-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | hook dirs fatal Remove this IsNotExist out which was added along with the rest of this block in f6a2b6bf2b (hooks: Add pre-create hooks for runtime-config manipulation, 2018-11-19, #1830). Besides the obvious "hook directory does not exist", it was swallowing the less-obvious "hook command does not exist". And either way, folks are likely going to want non-zero podman exits when we fail to load a hook directory they explicitly pointed us towards. Signed-off-by: W. Trevor King <wking@tremily.us>
* | Implement conmon execPeter Hunt2019-07-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This includes: Implement exec -i and fix some typos in description of -i docs pass failed runtime status to caller Add resize handling for a terminal connection Customize exec systemd-cgroup slice fix healthcheck fix top add --detach-keys Implement podman-remote exec (jhonce) * Cleanup some orphaned code (jhonce) adapt remote exec for conmon exec (pehunt) Fix healthcheck and exec to match docs Introduce two new OCIRuntime errors to more comprehensively describe situations in which the runtime can error Use these different errors in branching for exit code in healthcheck and exec Set conmon to use new api version Signed-off-by: Jhon Honce <jhonce@redhat.com> Signed-off-by: Peter Hunt <pehunt@redhat.com>
* | golangci-lint round #3baude2019-07-21
| | | | | | | | | | | | | | this is the third round of preparing to use the golangci-lint on our code base. Signed-off-by: baude <bbaude@redhat.com>
* | golangci-lint pass number 2baude2019-07-11
| | | | | | | | | | | | clean up and prepare to migrate to the golangci-linter Signed-off-by: baude <bbaude@redhat.com>
* | Merge pull request #3425 from adrianreber/restore-mount-labelOpenShift Merge Robot2019-07-08
|\ \ | | | | | | Set correct SELinux label on restored containers
| * | Provide correct SELinux mount-label for restored containerAdrian Reber2019-06-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Restoring a container from a checkpoint archive creates a complete new root file-system. This file-system needs to have the correct SELinux label or most things in that restored container will fail. Running processes are not as problematic as newly exec()'d process (internally or via 'podman exec'). This patch tells the storage setup which label should be used to mount the container's root file-system. Signed-off-by: Adrian Reber <areber@redhat.com>
* | | code cleanupbaude2019-07-08
| | | | | | | | | | | | | | | | | | clean up code identified as problematic by golands inspection Signed-off-by: baude <bbaude@redhat.com>
* | | Merge pull request #3472 from haircommander/generate-volumesOpenShift Merge Robot2019-07-04
|\ \ \ | | | | | | | | generate kube with volumes
| * | | Improve parsing of mountsPeter Hunt2019-07-02
| | | | | | | | | | | | | | | | | | | | | | | | Specifically, we were needlessly doing a double lookup to find which config mounts were user volumes. Improve this by refactoring a bit of code from inspect Signed-off-by: Peter Hunt <pehunt@redhat.com>
* | | | trivial cleanups from golangbaude2019-07-03
| | | | | | | | | | | | | | | | | | | | | | | | the results of a code cleanup performed by the goland IDE. Signed-off-by: baude <bbaude@redhat.com>
* | | | Wipe PID and ConmonPID in state after container stopsMatthew Heon2019-07-02
| | | | | | | | | | | | | | | | | | | | | | | | Matches the behavior of Docker. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* | | | Store Conmon's PID in our state and display in inspectMatthew Heon2019-07-02
|/ / / | | | | | | | | | Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* | | libpod removal from main (phase 2)baude2019-06-27
| | | | | | | | | | | | | | | | | | this is phase 2 for the removal of libpod from main. Signed-off-by: baude <bbaude@redhat.com>
* | | libpod: use pkg/cgroups instead of containerd/cgroupsGiuseppe Scrivano2019-06-26
| | | | | | | | | | | | | | | | | | use the new implementation for dealing with cgroups. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* | | remove libpod from mainbaude2019-06-25
|/ / | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | Add additional debugging when refreshing locksMatthew Heon2019-06-21
| | | | | | | | Signed-off-by: Matthew Heon <mheon@redhat.com>
* | Begin adding support for multiple OCI runtimesMatthew Heon2019-06-19
| | | | | | | | | | | | | | | | | | | | | | | | | | Allow Podman containers to request to use a specific OCI runtime if multiple runtimes are configured. This is the first step to properly supporting containers in a multi-runtime environment. The biggest changes are that all OCI runtimes are now initialized when Podman creates its runtime, and containers now use the runtime requested in their configuration (instead of always the default runtime). Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* | When you change the storage driver we ignore the storage-optionsDaniel J Walsh2019-06-08
| | | | | | | | | | | | | | | | | | | | | | The storage driver and the storage options in storage.conf should match, but if you change the storage driver via the command line then we need to nil out the default storage options from storage.conf. If the user wants to change the storage driver and use storage options, they need to specify them on the command line. Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
* | Added support to migrate containersAdrian Reber2019-06-03
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | Added helper functions for container migrationAdrian Reber2019-06-03
|/ | | | | | | | 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>
* libpod: prefer WaitForFile to pollingGiuseppe Scrivano2019-05-21
| | | | | | | replace two usage of kwait.ExponentialBackoff in favor of WaitForFile that uses inotify when possible. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* Use standard remove functions for removing pod ctrsMatthew Heon2019-05-10
| | | | | | | Instead of rewriting the logic, reuse the standard logic we use for removing containers, which is much better tested. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* When refreshing after a reboot, force lock allocationMatthew Heon2019-05-06
| | | | | | | | | | | | | | After a reboot, when we refresh Podman's state, we retrieved the lock from the fresh SHM instance, but we did not mark it as allocated to prevent it being handed out to other containers and pods. Provide a method for marking locks as in-use, and use it when we refresh Podman state after a reboot. Fixes #2900 Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Small code fixMatthew Heon2019-05-03
| | | | Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Address review comments on restart policyMatthew Heon2019-05-03
| | | | Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Add a restart event, and make one during restart policyMatthew Heon2019-05-03
| | | | Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Restart policy should not run if a container is runningMatthew Heon2019-05-03
| | | | Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Move to using constants for valid restart policy typesMatthew Heon2019-05-03
| | | | Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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