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Before, we were using -1 as a bogus value in podman to signify something went wrong when reading from a conmon pipe. However, conmon uses negative values to indicate the runtime failed, and return the runtime's exit code.
instead, we should use a bogus value that is actually bogus. Define that value in the define package as MinInt32 (-1<< 31 - 1), which is outside of the range of possible pids (-1 << 31)
Signed-off-by: Peter Hunt <pehunt@redhat.com>
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Before, we were getting the exit code from the file, in which we waited an arbitrary amount of time (5 seconds) for the file, and segfaulted if we didn't find it. instead, we should be a bit more certain conmon has sent the exit code. Luckily, it sends the exit code along the sync pipe fd, so we can read it from there
Adapt the ExecContainer interface to pass along a channel to get the pid and exit code from conmon, to be able to read both from the pipe
Signed-off-by: Peter Hunt <pehunt@redhat.com>
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This corrects a regression from Podman 1.4.x where container exec
sessions inherited supplemental groups from the container, iff
the exec session did not specify a user.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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when using -d and port mapping, make sure the correct fd is injected
into conmon.
Move the pipe creation earlier as the fd must be known at the time we
create the container through conmon.
Closes: https://github.com/containers/libpod/issues/5167
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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oci_conmon: do not create a cgroup under systemd
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Detect whether we are running under systemd (if the INVOCATION_ID is
set). If Podman is running under a systemd service, we do not need to
create a cgroup for conmon.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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it allows to disable cgroups creation only for the conmon process.
A new cgroup is created for the container payload.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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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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do not change the permissions mask for the rundir and the tmpdir when
running a container with a user namespace and the current user is
mapped inside the user namespace.
The change was introduced with
849548ffb8e958e901317eceffdcc2d918cafd8d, that dropped the
intermediate mount namespace in favor of allowing root into the user
namespace to access these directories.
Closes: https://github.com/containers/libpod/issues/4846
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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`gocritic` is a powerful linter that helps in preventing certain kinds
of errors as well as enforcing a coding style.
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
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log: support --log-opt tag=
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support a custom tag to add to each log for the container.
It is currently supported only by the journald backend.
Closes: https://github.com/containers/libpod/issues/3653
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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exec: fix pipes
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In a largely anticlimatic solution to the saga of piped input from conmon, we come to this solution.
When we pass the Stdin stream to the exec.Command structure, it's immediately consumed and lost, instead of being consumed through CopyDetachable().
When we don't pass -i in, conmon is not told to create a masterfd_stdin, and won't pass anything to the container.
With both, we can do
echo hi | podman exec -til cat
and get the expected hi
Signed-off-by: Peter Hunt <pehunt@redhat.com>
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Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
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RootlessKit port forwarder has a lot of advantages over the slirp4netns port forwarder:
* Very high throughput.
Benchmark result on Travis: socat: 5.2 Gbps, slirp4netns: 8.3 Gbps, RootlessKit: 27.3 Gbps
(https://travis-ci.org/rootless-containers/rootlesskit/builds/597056377)
* Connections from the host are treated as 127.0.0.1 rather than 10.0.2.2 in the namespace.
No UDP issue (#4586)
* No tcp_rmem issue (#4537)
* Probably works with IPv6. Even if not, it is trivial to support IPv6. (#4311)
* Easily extensible for future support of SCTP
* Easily extensible for future support of `lxc-user-nic` SUID network
RootlessKit port forwarder has been already adopted as the default port forwarder by Rootless Docker/Moby,
and no issue has been reported AFAIK.
As the port forwarder is imported as a Go package, no `rootlesskit` binary is required for Podman.
Fix #4586
May-fix #4559
Fix #4537
May-fix #4311
See https://github.com/rootless-containers/rootlesskit/blob/v0.7.0/pkg/port/builtin/builtin.go
Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
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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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refactor libpod config into libpod/config
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Refactor the `RuntimeConfig` along with related code from libpod into
libpod/config. Note that this is a first step of consolidating code
into more coherent packages to make the code more maintainable and less
prone to regressions on the long runs.
Some libpod definitions were moved to `libpod/define` to resolve
circular dependencies.
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
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libpod, rootless: create cgroup for conmon
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always create a new cgroup for conmon also when running as rootless.
We were previously creating one only when necessary, but that behaves
differently than root containers.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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Processes execed into a container were not being run with the correct label.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
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Signed-off-by: Peter Hunt <pehunt@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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In some cases, conmon can fail without writing logs. Change the wording
of the error message from
"error reading container (probably exited) json message"
to
"container create failed (no logs from conmon)"
to have a more helpful error message that is more consistent with other
errors at that stage of execution.
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
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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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