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The new APIv2 branch provides an HTTP-based remote API to Podman.
The requirements of this are, unfortunately, incompatible with
the existing Attach API. For non-terminal attach, we need append
a header to what was copied from the container, to multiplex
STDOUT and STDERR; to do this with the old API, we'd need to copy
into an intermediate buffer first, to handle the headers.
To avoid this, provide a new API to handle all aspects of
terminal and non-terminal attach, including closing the hijacked
HTTP connection. This might be a bit too specific, but for now,
it seems to be the simplest approach.
At the same time, add a Resize endpoint. This needs to be a
separate endpoint, so our existing channel approach does not work
here.
I wanted to rework the rest of attach at the same time (some
parts of it, particularly how we start the Attach session and how
we do resizing, are (in my opinion) handled much better here.
That may still be on the table, but I wanted to avoid breaking
existing APIs in this already massive change.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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When a container is in a PID namespace, it is enought to send
the stop signal to the PID 1 of the namespace, only send signals
to all processes in the container when the container is not in
a pid namespace.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
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We currently rely on exec sessions being removed from the state
by the Exec() API itself, on detecting the session stopping. This
is not a reliable method, though. The Podman frontend for exec
could be killed before the session ended, or another Podman
process could be holding the lock and prevent update (most
notable in `run --rm`, when a container with an active exec
session is stopped).
To resolve this, add a function to reap active exec sessions from
the state, and use it on cleanup (to clear sessions after the
container stops) and remove (to do the same when --rm is passed).
This is a bit more complicated than it ought to be because Kata
and company exist, and we can't guarantee the exec session has a
PID on the host, so we have to plumb this through to the OCI
runtime.
Fixes #4666
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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When Libpod removes a container, there is the possibility that
removal will not fully succeed. The most notable problems are
storage issues, where the container cannot be removed from
c/storage.
When this occurs, we were faced with a choice. We can keep the
container in the state, appearing in `podman ps` and available for
other API operations, but likely unable to do any of them as it's
been partially removed. Or we can remove it very early and clean
up after it's already gone. We have, until now, used the second
approach.
The problem that arises is intermittent problems removing
storage. We end up removing a container, failing to remove its
storage, and ending up with a container permanently stuck in
c/storage that we can't remove with the normal Podman CLI, can't
use the name of, and generally can't interact with. A notable
cause is when Podman is hit by a SIGKILL midway through removal,
which can consistently cause `podman rm` to fail to remove
storage.
We now add a new state for containers that are in the process of
being removed, ContainerStateRemoving. We set this at the
beginning of the removal process. It notifies Podman that the
container cannot be used anymore, but preserves it in the DB
until it is fully removed. This will allow Remove to be run on
these containers again, which should successfully remove storage
if it fails.
Fixes #3906
Signed-off-by: Matthew Heon <mheon@redhat.com>
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I basically copied and adapted the statements for setting IP.
Closes #1136
Signed-off-by: Jakub Filak <jakub.filak@sap.com>
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There were many situations that made exec act funky with input. pipes didn't work as expected, as well as sending input before the shell opened.
Thinking about it, it seemed as though the issues were because of how os.Stdin buffers (it doesn't). Dropping this input had some weird consequences.
Instead, read from os.Stdin as bufio.Reader, allowing the input to buffer before passing it to the container.
Signed-off-by: Peter Hunt <pehunt@redhat.com>
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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>
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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>
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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>
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This change matches what is happening on the podman local side
and should eliminate a race condition.
Also exit commands on the server side should start to return to client.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
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We have leaked the exit number codess all over the code, this patch
removes the numbers to constants.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
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use the inotify backend to be notified on the container exit instead
of polling continuosly the runtime. Polling the runtime slowns
significantly down the podman execution time for short lived
processes:
$ time bin/podman run --rm -ti fedora true
real 0m0.324s
user 0m0.088s
sys 0m0.064s
from:
$ time podman run --rm -ti fedora true
real 0m4.199s
user 0m5.339s
sys 0m0.344s
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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Before, if the container was run with a specified user that wasn't root, exec would fail because it always set to root unless respecified by user.
instead, inherit the user from the container start.
Signed-off-by: Peter Hunt <pehunt@redhat.com>
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restore: added --ignore-static-ip option
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If a container is restored multiple times from an exported checkpoint
with the help of '--import --name', the restore will fail if during
'podman run' a static container IP was set with '--ip'. The user can
tell the restore process to ignore the static IP with
'--ignore-static-ip'.
Signed-off-by: Adrian Reber <areber@redhat.com>
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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>
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There's no way to get the error if we successfully get an exit code (as it's just printed to stderr instead).
instead of relying on the error to be passed to podman, and edit based on the error code, process it on the varlink side instead
Also move error codes to define package
Signed-off-by: Peter Hunt <pehunt@redhat.com>
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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>
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this is the third round of preparing to use the golangci-lint on our
code base.
Signed-off-by: baude <bbaude@redhat.com>
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Include changes to the container's root file-system in the checkpoint archive
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The newly added functionality to include the container's root
file-system changes into the checkpoint archive can now be explicitly
disabled. Either during checkpoint or during restore.
If a container changes a lot of files during its runtime it might be
more effective to migrated the root file-system changes in some other
way and to not needlessly increase the size of the checkpoint archive.
If a checkpoint archive does not contain the root file-system changes
information it will automatically be skipped. If the root file-system
changes are part of the checkpoint archive it is also possible to tell
Podman to ignore these changes.
Signed-off-by: Adrian Reber <areber@redhat.com>
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Signed-off-by: Adrian Reber <areber@redhat.com>
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We have another patch running to do the same for exit files, with
a much more in-depth explanation of why it's necessary. Suffice
to say that persistent files in tmpfs tied to container CGroups
lead to significant memory allocations that last for the lifetime
of the file.
Based on a patch by Andrea Arcangeli (aarcange@redhat.com).
Signed-off-by: Matthew Heon <mheon@redhat.com>
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clean up and prepare to migrate to the golangci-linter
Signed-off-by: baude <bbaude@redhat.com>
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libpod: specify a detach keys sequence in libpod.conf
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When a container is attached upon start, the WaitGroup counter may
never be decremented if an error is raised before start, causing
the caller to hang.
Synchronize with the start & attach goroutine using a channel, to be
able to detect failures before start.
Signed-off-by: Marco Vedovati <mvedovati@suse.com>
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this is phase 2 for the removal of libpod from main.
Signed-off-by: baude <bbaude@redhat.com>
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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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We weren't properly populating the container's OCI Runtime in
Batch(), causing segfaults on attempting to access it. Add a test
to make sure we actually catch cases like this in the future.
Fixes #3411
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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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>
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Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
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Extend kill's error message to include the container's ID and state.
This address cases where error messages caused by other containers
may confuse users.
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
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This way a tool can determine if the container exists or not, but is in the
wrong state.
Since 126 is documeted as:
**_126_** if the **_contained command_** cannot be invoked
It makes sense that the container would exit with this state.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
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Begin to break up pkg/inspect
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Let's put inspect structs where they're actually being used. We
originally made pkg/inspect to solve circular import issues.
There are no more circular import issues.
Image structs remain for now, I'm focusing on container inspect.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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The option to restore a container from an external checkpoint archive
(podman container restore -i /tmp/checkpoint.tar.gz) restores a
container with the same name and same ID as id had before checkpointing.
This commit adds the option '--name,-n' to 'podman container restore'.
With this option the restored container gets the name specified after
'--name,-n' and a new ID. This way it is possible to restore one
container multiple times.
If a container is restored with a new name Podman will not try to
request the same IP address for the container as it had during
checkpointing. This implicitly assumes that if a container is restored
from a checkpoint archive with a different name, that it will be
restored multiple times and restoring a container multiple times with
the same IP address will fail as each IP address can only be used once.
Signed-off-by: Adrian Reber <areber@redhat.com>
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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>
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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>
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let the writer of the channel close it.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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StartAndAttach() runs start() in a goroutine, which can allow it
to fire after the caller returns - and thus, after the defer to
unlock the container lock has fired.
The start() call _must_ occur while the container is locked, or
else state inconsistencies may occur.
Fixes #3114
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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The on-failure restart option supports restarting only a given
number of times. To do this, we need one additional field in the
DB to track restart count (which conveniently fills a field in
Inspect we weren't populating), plus some plumbing logic.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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Noticed this when testing some behavior with Docker.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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This initial version does not support restart count, but it works
as advertised otherwise.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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As part of this, rework the number of workers used by various
Podman tasks to match original behavior - need an explicit
fallthrough in the switch statement for that block to work as
expected.
Also, trivial change to Podman cleanup to work on initialized
containers - we need to reset to a different state after cleaning
up the OCI runtime.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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* refactor command output to use one function
* Add new worker pool parallel operations
* Implement podman-remote umount
* Refactored podman wait to use printCmdOutput()
Signed-off-by: Jhon Honce <jhonce@redhat.com>
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It's not necessary to log an event for a read-only operation like
wait.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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Add event on container death
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Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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