Implement podman secret create, inspect, ls, rm
Implement podman run/create --secret
Secrets are blobs of data that are sensitive.
Currently, the only secret driver supported is filedriver, which means creating a secret stores it in base64 unencrypted in a file.
After creating a secret, a user can use the --secret flag to expose the secret inside the container at /run/secrets/[secretname]
This secret will not be commited to an image on a podman commit
Signed-off-by: Ashley Cui <acui@redhat.com>
When resolving the workdir of a container, we may need to create unless
the user set it explicitly on the command line. Otherwise, we just do a
presence check. Unfortunately, there was a missing return that lead us
to fall through into attempting to create and chown the workdir. That
caused a regression when running on a read-only root fs.
Fixes: #9230
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
A container's workdir can be specified via the CLI via `--workdir` and
via an image config with the CLI having precedence.
Since images have a tendency to specify workdirs without necessarily
shipping the paths with the root FS, make sure that Podman creates the
workdir. When specified via the CLI, do not create the path, but check
for its existence and return a human-friendly error.
NOTE: `crun` is performing a similar check that would yield exit code
127. With this change, however, Podman performs the check and yields
exit code 126. Since this is specific to `crun`, I do not consider it
to be a breaking change of Podman.
Fixes: #9040
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
This implements support for mounting and unmounting volumes
backed by volume plugins. Support for actually retrieving
plugins requires a pull request to land in containers.conf and
then that to be vendored, and as such is not yet ready. Given
this, this code is only compile tested. However, the code for
everything past retrieving the plugin has been written - there is
support for creating, removing, mounting, and unmounting volumes,
which should allow full functionality once the c/common PR is
merged.
A major change is the signature of the MountPoint function for
volumes, which now, by necessity, returns an error. Named volumes
managed by a plugin do not have a mountpoint we control; instead,
it is managed entirely by the plugin. As such, we need to cache
the path in the DB, and calls to retrieve it now need to access
the DB (and may fail as such).
Notably absent is support for SELinux relabelling and chowning
these volumes. Given that we don't manage the mountpoint for
these volumes, I am extremely reluctant to try and modify it - we
could easily break the plugin trying to chown or relabel it.
Also, we had no less than *5* separate implementations of
inspecting a volume floating around in pkg/infra/abi and
pkg/api/handlers/libpod. And none of them used volume.Inspect(),
the only correct way of inspecting volumes. Remove them all and
consolidate to using the correct way. Compat API is likely still
doing things the wrong way, but that is an issue for another day.
Fixes#4304
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
`staticcheck` is a golang code analysis tool. https://staticcheck.io/
This commit fixes a lot of problems found in our code. Common problems are:
- unnecessary use of fmt.Sprintf
- duplicated imports with different names
- unnecessary check that a key exists before a delete call
There are still a lot of reported problems in the test files but I have
not looked at those.
Signed-off-by: Paul Holzinger <paul.holzinger@web.de>
writing to the id map fails when an extent overlaps multiple mappings
in the parent user namespace:
$ cat /proc/self/uid_map
0 1000 1
1 100000 65536
$ unshare -U sleep 100 &
[1] 1029703
$ printf "0 0 100\n" | tee /proc/$!/uid_map
0 0 100
tee: /proc/1029703/uid_map: Operation not permitted
This limitation is particularly annoying when working with rootless
containers as each container runs in the rootless user namespace, so a
command like:
$ podman run --uidmap 0:0:2 --rm fedora echo hi
Error: writing file `/proc/664087/gid_map`: Operation not permitted: OCI permission denied
would fail since the specified mapping overlaps the first
mapping (where the user id is mapped to root) and the second extent
with the additional IDs available.
Detect such cases and automatically split the specified mapping with
the equivalent of:
$ podman run --uidmap 0:0:1 --uidmap 1:1:1 --rm fedora echo hi
hi
A fix has already been proposed for the kernel[1], but even if it
accepted it will take time until it is available in a released kernel,
so fix it also in pkg/rootless.
[1] https://lkml.kernel.org/lkml/20201203150252.1229077-1-gscrivan@redhat.com/
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
When migrating a container with associated volumes, the content of
these volumes should be made available on the destination machine.
This patch enables container checkpoint/restore with named volumes
by including the content of volumes in checkpoint file. On restore,
volumes associated with container are created and their content is
restored.
The --ignore-volumes option is introduced to disable this feature.
Example:
# podman container checkpoint --export checkpoint.tar.gz <container>
The content of all volumes associated with the container are included
in `checkpoint.tar.gz`
# podman container checkpoint --export checkpoint.tar.gz --ignore-volumes <container>
The content of volumes is not included in `checkpoint.tar.gz`. This is
useful, for example, when the checkpoint/restore is performed on the
same machine.
# podman container restore --import checkpoint.tar.gz
The associated volumes will be created and their content will be
restored. Podman will exit with an error if volumes with the same
name already exist on the system or the content of volumes is not
included in checkpoint.tar.gz
# podman container restore --ignore-volumes --import checkpoint.tar.gz
Volumes associated with container must already exist. Podman will not
create them or restore their content.
Signed-off-by: Radostin Stoyanov <rstoyanov@fedoraproject.org>
Instead of individual values from ContainerCheckpointOptions,
provide the options object.
This is a preparation for the next patch where one more value
of the options object is required in exportCheckpoint().
Signed-off-by: Radostin Stoyanov <rstoyanov@fedoraproject.org>
When adding the HOSTNAME environment variable, only do so if it
is not already present in the spec. If it is already present, it
was likely added by the user, and we should honor their requested
value.
Fixes#8886
Signed-off-by: Matthew Heon <mheon@redhat.com>
do not check whether the specified ID is valid in the user namespace.
crun handles this case[1], so the check in Podman prevents to get to
the OCI runtime at all.
$ podman run --user 10:0 --uidmap 0:0:1 --rm -ti fedora:33 sh -c 'id; cat /proc/self/uid_map'
uid=10(10) gid=0(root) groups=0(root),65534(nobody)
10 0 1
[1] https://github.com/containers/crun/pull/556
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
This adds a new command, 'podman network reload', to reload the
networks of existing containers, forcing recreation of firewall
rules after e.g. `firewall-cmd --reload` wipes them out.
Under the hood, this works by calling CNI to tear down the
existing network, then recreate it using identical settings. We
request that CNI preserve the old IP and MAC address in most
cases (where the container only had 1 IP/MAC), but there will be
some downtime inherent to the teardown/bring-up approach. The
architecture of CNI doesn't really make doing this without
downtime easy (or maybe even possible...).
At present, this only works for root Podman, and only locally.
I don't think there is much of a point to adding remote support
(this is very much a local debugging command), but I think adding
rootless support (to kill/recreate slirp4netns) could be
valuable.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
Signed-off-by: Paul Holzinger <paul.holzinger@web.de>
We have been asked to leak some information into the container
to indicate:
* The name and id of the container
* The version of podman used to launch the container
* The image name and ID the container is based on.
* Whether the container engine is running in rootless mode.
Fixes: https://github.com/containers/podman/issues/6192
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Our users are missing certain warning messages that would
make debugging issues with Podman easier.
For example if you do a podman build with a Containerfile
that contains the SHELL directive, the Derective is silently
ignored.
If you run with the log-level warn you get a warning message explainging
what happened.
$ podman build --no-cache -f /tmp/Containerfile1 /tmp/
STEP 1: FROM ubi8
STEP 2: SHELL ["/bin/bash", "-c"]
STEP 3: COMMIT
--> 7a207be102a
7a207be102aa8993eceb32802e6ceb9d2603ceed9dee0fee341df63e6300882e
$ podman --log-level=warn build --no-cache -f /tmp/Containerfile1 /tmp/
STEP 1: FROM ubi8
STEP 2: SHELL ["/bin/bash", "-c"]
STEP 3: COMMIT
WARN[0000] SHELL is not supported for OCI image format, [/bin/bash -c] will be ignored. Must use `docker` format
--> 7bd96fd25b9
7bd96fd25b9f755d8a045e31187e406cf889dcf3799357ec906e90767613e95f
These messages will no longer be lost, when we default to WARNing level.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
The buildah/pkg/secrts package was move to
containers/common/pkg/subscriptions.
Switch to using this by default.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
When looking up a container's cgroup path, parse /proc/[PID]/cgroup.
This will work across all cgroup managers and configurations and is
supported on cgroups v1 and v2.
Fixes: #8265
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
The --hostname and containername should always be added to containers.
Added some tests to make sure you can always ping the hostname and container
name from within the container.
Fixes: https://github.com/containers/podman/issues/8095
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Allow users to specify unbindable on volume command line
Switch internal mounts to rprivate to help prevent leaks.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Most of the builtin golang functions like os.Stat and
os.Open report errors including the file system object
path. We should not wrap these errors and put the file path
in a second time, causing stuttering of errors when they
get presented to the user.
This patch tries to cleanup a bunch of these errors.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Add a new "image" mount type to `--mount`. The source of the mount is
the name or ID of an image. The destination is the path inside the
container. Image mounts further support an optional `rw,readwrite`
parameter which if set to "true" will yield the mount writable inside
the container. Note that no changes are propagated to the image mount
on the host (which in any case is read only).
Mounts are overlay mounts. To support read-only overlay mounts, vendor
a non-release version of Buildah.
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
If the resolv.conf file is empty we provide default dns servers.
If the file does not exists we error and don't create the
container. We should also provide the default entries in this
case. This is also what docker does.
Fixes#8089
Signed-off-by: Paul Holzinger <paul.holzinger@web.de>
This does not match Docker, which does not add hostname in this
case, but it seems harmless enough.
Fixes#8095
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
When a container uses --net=host the default hostname is set to
the host's hostname. However, we were not creating any entries
in `/etc/hosts` despite having a hostname, which is incorrect.
This hostname, for Docker compat, will always be the hostname of
the host system, not the container, and will be assigned to IP
127.0.1.1 (not the standard localhost address).
Also, when `--hostname` and `--net=host` are both passed, still
use the hostname from `--hostname`, not the host's hostname (we
still use the host's hostname by default in this case if the
`--hostname` flag is not passed).
Fixes#8054
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
We need to do a length check before we can access the
networkStatus slice by index to prevent a runtime panic.
Fixes#8026
Signed-off-by: Paul Holzinger <paul.holzinger@web.de>
Currently the HOME environment is set to /root if
the user does not override it.
Also walk the parent directories of users homedir
to see if it is volume mounted into the container,
if yes, then set it correctly.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
When we create a container, we assign a cgroup parent based on
the current cgroup manager in use. This parent is only usable
with the cgroup manager the container is created with, so if the
default cgroup manager is later changed or overridden, the
container will not be able to start.
To solve this, store the cgroup manager that created the
container in container configuration, so we can guarantee a
container with a systemd cgroup parent will always be started
with systemd cgroups.
Unfortunately, this is very difficult to test in CI, due to the
fact that we hard-code cgroup manager on all invocations of
Podman in CI.
Fixes#7830
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
We do not populate the hostname field with the IP Address
when running within a user namespace.
Fixes https://github.com/containers/podman/issues/7490
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
This commit is courtesy of
```
for f in $(git ls-files *.go | grep -v ^vendor/); do \
sed -i 's/\(errors\..*\)"Error /\1"error /' $f;
done
for f in $(git ls-files *.go | grep -v ^vendor/); do \
sed -i 's/\(errors\..*\)"Failed to /\1"failed to /' $f;
done
```
etc.
Self-reviewed using `git diff --word-diff`, found no issues.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
In case os.Open[File], os.Mkdir[All], ioutil.ReadFile and the like
fails, the error message already contains the file name and the
operation that fails, so there is no need to wrap the error with
something like "open %s failed".
While at it
- replace a few places with os.Open, ioutil.ReadAll with
ioutil.ReadFile.
- replace errors.Wrapf with errors.Wrap for cases where there
are no %-style arguments.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
check there are enough gids in the user namespace before adding
supplementary gids from /etc/group.
Follow-up for baede7cd27
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
There is a risk here, that if the GID does not exists
within the User Namespace the container will fail to start.
This is only likely to happen in HPC Envioronments, and I think
we should add a field to disable it for this environment,
Added a FIXME for this issue.
We currently have this problem with running a rootfull container within
a user namespace, it will fail if the GID is not available.
I looked at potentially checking the usernamespace that you are assigned
to, but I believe this will be very difficult to code up and to figure out.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
The kernel will not allow you to modify existing mount flags on a volume
when bind mounting it to another place. Since /sys/fs/cgroup/systemd is
mounted noexec on the host, it needs to be mounted with the same flags
in the rootless container.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
To ensure that the user running in the container ahs a valid
entry in /etc/passwd so lookup functions for the current user
will not error, Podman previously began adding entries to the
passwd file. We did not, however, add entries to the group file,
and this created problems - our passwd entries included the group
the user is in, but said group might not exist. The solution is
to mirror our logic for /etc/passwd modifications to also edit
/etc/group in the container.
Unfortunately, this is not a catch-all solution. Our logic here
is only advanced enough to *add* to the group file - so if the
group already exists but we add a user not a part of it, we will
not modify that existing entry, and things remain inconsistent.
We can look into adding this later if we absolutely need to, but
it would involve adding significant complexity to this already
massively complicated function.
While we're here, address an edge case where Podman could add a
user or group whose UID overlapped with an existing user or
group.
Also, let's make users able to log into users we added. Instead
of generating user entries with an 'x' in the password field,
indicating they have an entry in /etc/shadow, generate a '*'
indicating the user has no password but can be logged into by
other means e.g. ssh key, su.
Fixes#7503Fixes#7389Fixes#7499
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
Usage:
```
$ podman network create foo
$ podman run -d --name web --hostname web --network foo nginx:alpine
$ podman run --rm --network foo alpine wget -O - http://web.dns.podman
Connecting to web.dns.podman (10.88.4.6:80)
...
<h1>Welcome to nginx!</h1>
...
```
See contrib/rootless-cni-infra for the design.
Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
The system defaults /run to "exec" mode, and we default --read-only
mounts on /run to "exec", so --systemd should follow suit.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
We want to modify /etc/passwd to add an entry for the user in
question, but at the same time we don't want to require the
container provide a /etc/passwd (a container with a single,
statically linked binary and nothing else is perfectly fine and
should be allowed, for example). We could create the passwd file
if it does not exist, but if the container doesn't provide one,
it's probably better not to make one at all. Gate changes to
/etc/passwd behind a stat() of the file in the container
returning cleanly.
Fixes#7515
Signed-off-by: Matthew Heon <mheon@redhat.com>
We had a customer incident where they ran out of space on /run.
If you don't specify size, it will be still limited to 50% or memory
available in the cgroup the container is running in. If the cgroup is
unlimited then the /run will be limited to 50% of the total memory
on the system.
Also /run is mounted on the host as exec, so no reason for us to mount
it noexec.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
I used the wrong propagation first time around because I forgot
that rprivate is the default propagation. Oops. Switch to
rprivate so we're using the default.
Signed-off-by: Matthew Heon <mheon@redhat.com>
On cgroups v1 systems, we need to mount /sys/fs/cgroup/systemd
into the container. We were doing this with no explicit mount
propagation tag, which means that, under some circumstances, the
shared mount propagation could be chosen - which, combined with
the fact that we need a mount to mask
/sys/fs/cgroup/systemd/release_agent in the container, means we
would leak a never-ending set of mounts under
/sys/fs/cgroup/systemd/ on container restart.
Fortunately, the fix is very simple - hardcode mount propagation
to something that won't leak.
Signed-off-by: Matthew Heon <mheon@redhat.com>
A recent crun change stopped the creation of the container's
working directory if it does not exist. This is arguably correct
for user-specified directories, to protect against typos; it is
definitely not correct for image WORKDIR, where the image author
definitely intended for the directory to be used.
This makes Podman create the working directory and chown it to
container root, if it does not already exist, and only if it was
specified by an image, not the user.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
Bind-mounting /etc/passwd into the container is problematic
becuase of how system utilities like `useradd` work. They want
to make a copy and then rename to try to prevent breakage; this
is, unfortunately, impossible when the file they want to rename
is a bind mount. The current behavior is fine for read-only
containers, though, because we expect useradd to fail in those
cases.
Instead of bind-mounting, we can edit /etc/passwd in the
container's rootfs. This is kind of gross, because the change
will show up in `podman diff` and similar tools, and will be
included in images made by `podman commit`. However, it's a lot
better than breaking important system tools.
Fixes#6953
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
Currently you can not apply an ApparmorProfile if you specify
--privileged. This patch will allow both to be specified
simultaniosly.
By default Apparmor should be disabled if the user
specifies --privileged, but if the user specifies --security apparmor:PROFILE,
with --privileged, we should do both.
Added e2e run_apparmor_test.go
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
--umask sets the umask inside the container
Defaults to 0022
Co-authored-by: Daniel J Walsh <dwalsh@redhat.com>
Signed-off-by: Ashley Cui <acui@redhat.com>
We added code to create a `/etc/passwd` file that we bind-mount
into the container in some cases (most notably,
`--userns=keep-id` containers). This, unfortunately, was not
persistent, so user-added users would be dropped on container
restart. Changing where we store the file should fix this.
Further, we want to ensure that lookups of users in the container
use the right /etc/passwd if we replaced it. There was already
logic to do this, but it only worked for user-added mounts; it's
easy enough to alter it to use our mounts as well.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
This was inspired by https://github.com/cri-o/cri-o/pull/3934 and
much of the logic for it is contained there. However, in brief,
a named return called "err" can cause lots of code confusion and
encourages using the wrong err variable in defer statements,
which can make them work incorrectly. Using a separate name which
is not used elsewhere makes it very clear what the defer should
be doing.
As part of this, remove a large number of named returns that were
not used anywhere. Most of them were once needed, but are no
longer necessary after previous refactors (but were accidentally
retained).
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
If I enter a continer with --userns keep-id, my UID will be present
inside of the container, but most likely my user will not be defined.
This patch will take information about the user and stick it into the
container.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
With the advent of Podman 2.0.0 we crossed the magical barrier of go
modules. While we were able to continue importing all packages inside
of the project, the project could not be vendored anymore from the
outside.
Move the go module to new major version and change all imports to
`github.com/containers/libpod/v2`. The renaming of the imports
was done via `gomove` [1].
[1] https://github.com/KSubedi/gomove
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
--tz flag sets timezone inside container
Can be set to IANA timezone as well as `local` to match host machine
Signed-off-by: Ashley Cui <acui@redhat.com>
When running under systemd there is no need to create yet another
cgroup for the container.
With conmon-delegated the current cgroup will be split in two sub
cgroups:
- supervisor
- container
The supervisor cgroup will hold conmon and the podman process, while
the container cgroup is used by the OCI runtime (using the cgroupfs
backend).
Closes: https://github.com/containers/libpod/issues/6400
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
This will allow containers that connect to the network namespace be
able to use the container name directly.
For example you can do something like
podman run -ti --name foobar fedora ping foobar
While we can do this with hostname now, this seems more natural.
Also if another container connects on the network to this container it
can do
podman run --network container:foobar fedora ping foobar
And connect to the original container,without having to discover the name.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
fix the check for c.state.NetNS == nil. Its value is changed in the
first code block, so the condition is always true in the second one
and we end up running slirp4netns twice.
Closes: https://github.com/containers/libpod/issues/6538
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
do not set the hostname when joining an UTS namespace, as it could be
owned by a different userns.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
when running in a new userns, make sure the resolv.conf and hosts
files bind mounted from another container are accessible to root in
the userns.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
In FIPS Mode we expect to work off of the Mountpath not the Rundir path.
This is causing FIPS Mode checks to fail.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Add more default options parsing
Switch to using --time as opposed to --timeout to better match Docker.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
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>
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>
Enables most of the network-related functionality from
`podman run` in `podman pod create`. Custom CNI networks can be
specified, host networking is supported, DNS options can be
configured.
Also enables host networking in `podman play kube`.
Fixes#2808Fixes#3837Fixes#4432Fixes#4718Fixes#4770
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
`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>
When doing a checkpoint with --export the root file-system diff was not
working as expected. Instead of getting the changes from the running
container to the highest storage layer it got the changes from the
highest layer to that parent's layer. For a one layer container this
could mean that the complete root file-system is part of the checkpoint.
With this commit this changes to use the same functionality as 'podman
diff'. This actually enables to correctly diff the root file-system
including tracking deleted files.
This also removes the non-working helper functions from libpod/diff.go.
Signed-off-by: Adrian Reber <areber@redhat.com>
The code currently assumes that the container we delegate network
namespace to will never further delegate to another container, so
when looking up things like /etc/hosts and /etc/resolv.conf we
won't pull the correct files from the chained dependency. The
changes to resolve this are relatively simple - just need to keep
looking until we find a container without NetNsCtr set.
Fixes#4626
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
Trying to checkpoint a container started with --rm works, but it makes
no sense as the container, including the checkpoint, will be deleted
after writing the checkpoint. This commit inhibits checkpointing
containers started with '--rm' unless '--export' is used. If the
checkpoint is exported it can easily be restored from the exported
checkpoint, even if '--rm' is used. To restore a container from a
checkpoint it is even necessary to manually run 'podman rm' if the
container is not started with '--rm'.
Signed-off-by: Adrian Reber <areber@redhat.com>
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>
When restoring a container with user namespace, the user namespace is
created by the OCI runtime, and the network namespace is created after
the user namespace to ensure correct ownership.
In this case PostConfigureNetNS will be set and the value of
c.state.NetNS would be nil. Hence, the following error occurs:
$ sudo podman run --name cr \
--uidmap 0:1000:500 \
-d docker.io/library/alpine \
/bin/sh -c 'i=0; while true; do echo $i; i=$(expr $i + 1); sleep 1; done'
$ sudo podman container checkpoint cr
$ sudo podman container restore cr
...
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x30 pc=0x13a5e3c]
Signed-off-by: Radostin Stoyanov <rstoyanov1@gmail.com>
Pull in changes to pkg/secrets/secrets.go that adds the
logic to disable fips mode if a pod/container has a
label set.
Signed-off-by: Urvashi Mohnani <umohnani@redhat.com>
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>
when running in systemd mode on cgroups v1, make sure the
/sys/fs/cgroup/systemd/release_agent is masked otherwise the container
is able to modify it and execute scripts on the host.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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>
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>
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>
In order to run Podman with VM-based runtimes unprivileged, the
network must be set up prior to the container creation. Therefore
this commit modifies Podman to run rootless containers by:
1. create a network namespace
2. pass the netns persistent mount path to the slirp4netns
to create the tap inferface
3. pass the netns path to the OCI spec, so the runtime can
enter the netns
Closes#2897
Signed-off-by: Gabi Beyer <gabrielle.n.beyer@intel.com>
If the HOME environment variable is not set, make sure it is set to
the configuration found in the container /etc/passwd file.
It was previously depending on a runc behavior that always set HOME
when it is not set. The OCI runtime specifications do not require
HOME to be set so move the logic to libpod.
Closes: https://github.com/debarshiray/toolbox/issues/266
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
When --cgroupns=private is used we need to mount a new cgroup file
system so that it points to the correct namespace.
Needs: https://github.com/containers/crun/pull/88
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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>
This change adds the following annotation to every container created by
podman:
```json
"Annotations": {
"io.containers.manager": "libpod"
}
```
Target of this annotaions is to indicate which project in the containers
ecosystem is the major manager of a container when applications share
the same storage paths. This way projects can decide if they want to
manipulate the container or not. For example, since CRI-O and podman are
not using the same container library (libpod), CRI-O can skip podman
containers and provide the end user more useful information.
A corresponding end-to-end test has been adapted as well.
Relates to: https://github.com/cri-o/cri-o/pull/2761
Signed-off-by: Sascha Grunert <sgrunert@suse.com>
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>
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>
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>
when cni returns a list of dns servers, we should add them under the
right conditions. the defined conditions are as follows:
- if the user provides dns, it and only it are added.
- if not above and you get a cni name server, it is added and a
forwarding dns instance is created for what was in resolv.conf.
- if not either above, the entries from the host's resolv.conf are used.
Signed-off-by: baude <bbaude@redhat.com>
Signed-off-by: baude <bbaude@redhat.com>
commit 223fe64dc0 introduced the
regression.
When running on cgroups v1, bind mount only /sys/fs/cgroup/systemd as
rw, as the code did earlier.
Also, simplify the rootless code as it doesn't require any special
handling when using --systemd.
Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1737554
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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>
when running on a cgroups v2 system, do not bind mount
the named hierarchy /sys/fs/cgroup/systemd as it doesn't exist
anymore. Instead bind mount the entire /sys/fs/cgroup.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
In order to run Podman with VM-based runtimes unprivileged, the
network must be set up prior to the container creation. Therefore
this commit modifies Podman to run rootless containers by:
1. create a network namespace
2. pass the netns persistent mount path to the slirp4netns
to create the tap inferface
3. pass the netns path to the OCI spec, so the runtime can
enter the netns
Closes#2897
Signed-off-by: Gabi Beyer <gabrielle.n.beyer@intel.com>
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>
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>
One of the last limitations when migrating a container using Podman's
'podman container checkpoint --export=/path/to/archive.tar.gz' was
that it was necessary to manually handle changes to the container's root
file-system. The recommendation was to mount everything as --tmpfs where
the root file-system was changed.
This extends the checkpoint export functionality to also include all
changes to the root file-system in the checkpoint archive. The
checkpoint archive now includes a tarstream of the result from 'podman
diff'. This tarstream will be applied to the restored container before
restoring the container.
With this any container can now be migrated, even it there are changes
to the root file-system.
There was some discussion before implementing this to base the root
file-system migration on 'podman commit', but it seemed wrong to do
a 'podman commit' before the migration as that would change the parent
layer the restored container is referencing. Probably not really a
problem, but it would have meant that a migrated container will always
reference another storage top layer than it used to reference during
initial creation.
Signed-off-by: Adrian Reber <areber@redhat.com>
During 'podman container checkpoint' the finished time was not set. This
resulted in a strange container status after checkpointing:
Exited (0) 292 years ago
During checkpointing FinishedTime is now set to time.now().
Signed-off-by: Adrian Reber <areber@redhat.com>
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>
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 using slirp4netns, be sure the built-in DNS server is the first
one to be used.
Closes: https://github.com/containers/libpod/issues/3277
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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>
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>
Commit 27f9e23a0b already prevents setting the profile when creating
the spec but we also need to avoid loading and setting the profile when
creating the container.
Fixes: #3112
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
The --read-only-tmpfs option caused podman to mount tmpfs on /run, /tmp, /var/tmp
if the container is running int read-only mode.
The default is true, so you would need to execute a command like
--read-only --read-only-tmpfs=false to turn off this behaviour.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
The SELinux label for the CRIU dump.log was explicitly set in Podman.
The label for the restore.log, however, not. This just moves the code
to label the log file into a function and calls that functions during
checkpoint and restore.
Signed-off-by: Adrian Reber <areber@redhat.com>
* 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>
This swaps the previous handling (parse all volume mounts on the
container and look for ones that might refer to named volumes)
for the new, explicit named volume lists stored per-container.
It also deprecates force-removing volumes that are in use. I
don't know how we want to handle this yet, but leaving containers
that depend on a volume that no longer exists is definitely not
correct.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
We have an issue in the current implementation where the cleanup
process is not able to umount the storage as it is running in a
separate namespace.
Simplify the implementation for user namespaces by not using an
intermediate mount namespace. For doing it, we need to relax the
permissions on the parent directories and allow browsing
them. Containers that are running without a user namespace, will still
maintain mode 0700 on their directory.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Specifically, we want to be able to specify whether resolv.conf
and /etc/hosts will be create and bind-mounted into the
container.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
when --uidmap is used, the user won't be able to access
/var/lib/containers/storage/volumes. Use the intermediate mount
namespace, that is accessible to root in the container, for mounting
the volumes inside the container.
Closes: https://github.com/containers/libpod/issues/2713
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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>
When mounting a tmpfs, runc attempts to make the directory it
will be mounted at. Unfortunately, Golang's os.MkdirAll deals
very poorly with symlinks being part of the path. I looked into
fixing this in runc, but it's honestly much easier to just ensure
we don't trigger the issue on our end.
Fixes BZ #1686610
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
The logic of deleting and recreating /etc/hosts and
/etc/resolv.conf only makes sense when we're the one that creates
the files - when we don't, it just removes them, and there's
nothing left to use.
Fixes#2602
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
Trying to remove circular dependencies between libpod and buildah.
First step to move pkg content from libpod to buildah.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Before, any container with a netNS dependency simply used its dependency container's hosts file, and didn't abide its configuration (mainly --add-host). Fix this by always appending to the dependency container's hosts file, creating one if necessary.
Signed-off-by: Peter Hunt <pehunt@redhat.com>
To be able to use OCI runtimes which do not implement checkpoint/restore
this adds a check to the checkpoint code path and the checkpoint/restore
tests to see if it knows about the checkpoint subcommand. If the used
OCI runtime does not implement checkpoint/restore the tests are skipped
and the actual 'podman container checkpoint' returns an error.
Signed-off-by: Adrian Reber <areber@redhat.com>
CRIU creates a log file during checkpointing in .../userdata/dump.log.
The problem with this file is, is that CRIU injects a parasite code into
the container processes and this parasite code also writes to the same
log file. At this point a process from the inside of the container is
trying to access the log file on the outside of the container and
SELinux prohibits this. To enable writing to the log file from the
injected parasite code, this commit creates an empty log file and labels
the log file with c.MountLabel(). CRIU uses existing files when writing
it logs so the log file label persists and now, with the correct label,
SELinux no longer blocks access to the log file.
Signed-off-by: Adrian Reber <areber@redhat.com>
We should just bind mount the original containers /etc/resolv.conf and /etchosts
into the new container. Changes in the resolv.conf and hosts should be seen
by all containers, This matches Docker behaviour.
In order to make this work the labels on these files need to have a shared
SELinux label.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
If user specifies network namespace and the /etc/netns/XXX/resolv.conf
exists, we should use this rather then /etc/resolv.conf
Also fail cleaner if the user specifies an invalid Network Namespace.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
iFix builtin volumes to work with podman volume
Currently builtin volumes are not recored in podman volumes when
they are created automatically. This patch fixes this.
Remove container volumes when requested
Currently the --volume option on podman remove does nothing.
This will implement the changes needed to remove the volumes
if the user requests it.
When removing a volume make sure that no container uses the volume.
Signed-off-by: Daniel J Walsh dwalsh@redhat.com
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
The json-iterator package will panic on attempting to use
MarshalIndent with a non-space indentation. This is sort of silly
but swapping from tabs to spaces is not a big issue for us, so
let's work around the silly panic.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
Apply the default AppArmor profile at container initialization to cover
all possible code paths (i.e., podman-{start,run}) before executing the
runtime. This allows moving most of the logic into pkg/apparmor.
Also make the loading and application of the default AppArmor profile
versio-indepenent by checking for the `libpod-default-` prefix and
over-writing the profile in the run-time spec if needed.
The intitial run-time spec of the container differs a bit from the
applied one when having started the container, which results in
displaying a potentially outdated AppArmor profile when inspecting
a container. To fix that, load the container config from the file
system if present and use it to display the data.
Fixes: #2107
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
The initial implementation to request the same IP address for a
container during a restore was based on environment variables
influencing CNI.
With this commit the IP address selection switches to Podman's internal
static IP API.
This commit does a comment change in libpod/container_easyjson.go to
avoid unnecessary re-generation of libpod/container_easyjson.go during
build as this fails in CI. The reason for this is that make sees that
libpod/container_easyjson.go needs to be re-created. The commit,
however, only changes a part of libpod/container.go which is marked as
'ffjson: skip'.
Signed-off-by: Adrian Reber <areber@redhat.com>
There's been a lot of discussion over in [1] about how to support the
NVIDIA folks and others who want to be able to create devices
(possibly after having loaded kernel modules) and bind userspace
libraries into the container. Currently that's happening in the
middle of runc's create-time mount handling before the container
pivots to its new root directory with runc's incorrectly-timed
prestart hook trigger [2]. With this commit, we extend hooks with a
'precreate' stage to allow trusted parties to manipulate the config
JSON before calling the runtime's 'create'.
I'm recycling the existing Hook schema from pkg/hooks for this,
because we'll want Timeout for reliability and When to avoid the
expense of fork/exec when a given hook does not need to make config
changes [3].
[1]: https://github.com/opencontainers/runc/pull/1811
[2]: https://github.com/opencontainers/runc/issues/1710
[3]: https://github.com/containers/libpod/issues/1828#issuecomment-439888059
Signed-off-by: W. Trevor King <wking@tremily.us>
We had two problems with /dev/shm, first, you mount the
container read/only then /dev/shm was mounted read/only.
This is a bug a tmpfs directory should be read/write within
a read-only container.
The second problem is we were ignoring users mounted /dev/shm
from the host.
If user specified
podman run -d -v /dev/shm:/dev/shm ...
We were dropping this mount and still using the internal mount.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
When sharing a network namespace, containers should also share
resolv.conf and /etc/hosts in case a container process made
changes to either (for example, if I set up a VPN client in
container A and join container B to its network namespace, I
expect container B to use the DNS servers from A to ensure it can
see everything on the VPN).
Resolves: #1546
Signed-off-by: Matthew Heon <mheon@redhat.com>
Instead of forcing another user lookup when mounting image
volumes, just use the information we looked up when we started
generating the spec.
This may resolve#1817
Signed-off-by: Matthew Heon <mheon@redhat.com>
containers inside pods need to make sure they get /etc/resolv.conf
and /etc/hosts bind mounted when network is expected
Signed-off-by: baude <bbaude@redhat.com>
When an image config sets config.User [1] to a numeric group (like
1000:1000), but those values do not exist in the container's
/etc/group, libpod is currently breaking:
$ podman run --rm registry.svc.ci.openshift.org/ci-op-zvml7cd6/pipeline:installer --help
error creating temporary passwd file for container 228f6e9943d6f18b93c19644e9b619ec4d459a3e0eb31680e064eeedf6473678: unable to get gid 1000 from group file: no matching entries in group file
However, the OCI spec requires converters to copy numeric uid and gid
to the runtime config verbatim [2].
With this commit, I'm frontloading the "is groupspec an integer?"
check and only bothering with lookup.GetGroup when it was not.
I've also removed a few .Mounted checks, which are originally from
00d38cb3 (podman create/run need to load information from the image,
2017-12-18, #110). We don't need a mounted container filesystem to
translate integers. And when the lookup code needs to fall back to
the mounted root to translate names, it can handle erroring out
internally (and looking it over, it seems to do that already).
[1]: https://github.com/opencontainers/image-spec/blame/v1.0.1/config.md#L118-L123
[2]: https://github.com/opencontainers/image-spec/blame/v1.0.1/conversion.md#L70
Signed-off-by: W. Trevor King <wking@tremily.us>
Part of the motivation for 800eb863 (Hooks supports two directories,
process default and override, 2018-09-17, #1487) was [1]:
> We only use this for override. The reason this was caught is people
> are trying to get hooks to work with CoreOS. You are not allowed to
> write to /usr/share... on CoreOS, so they wanted podman to also look
> at /etc, where users and third parties can write.
But we'd also been disabling hooks completely for rootless users. And
even for root users, the override logic was tricky when folks actually
had content in both directories. For example, if you wanted to
disable a hook from the default directory, you'd have to add a no-op
hook to the override directory.
Also, the previous implementation failed to handle the case where
there hooks defined in the override directory but the default
directory did not exist:
$ podman version
Version: 0.11.2-dev
Go Version: go1.10.3
Git Commit: "6df7409cb5a41c710164c42ed35e33b28f3f7214"
Built: Sun Dec 2 21:30:06 2018
OS/Arch: linux/amd64
$ ls -l /etc/containers/oci/hooks.d/test.json
-rw-r--r--. 1 root root 184 Dec 2 16:27 /etc/containers/oci/hooks.d/test.json
$ podman --log-level=debug run --rm docker.io/library/alpine echo 'successful container' 2>&1 | grep -i hook
time="2018-12-02T21:31:19-08:00" level=debug msg="reading hooks from /usr/share/containers/oci/hooks.d"
time="2018-12-02T21:31:19-08:00" level=warning msg="failed to load hooks: {}%!(EXTRA *os.PathError=open /usr/share/containers/oci/hooks.d: no such file or directory)"
With this commit:
$ podman --log-level=debug run --rm docker.io/library/alpine echo 'successful container' 2>&1 | grep -i hook
time="2018-12-02T21:33:07-08:00" level=debug msg="reading hooks from /usr/share/containers/oci/hooks.d"
time="2018-12-02T21:33:07-08:00" level=debug msg="reading hooks from /etc/containers/oci/hooks.d"
time="2018-12-02T21:33:07-08:00" level=debug msg="added hook /etc/containers/oci/hooks.d/test.json"
time="2018-12-02T21:33:07-08:00" level=debug msg="hook test.json matched; adding to stages [prestart]"
time="2018-12-02T21:33:07-08:00" level=warning msg="implicit hook directories are deprecated; set --hooks-dir="/etc/containers/oci/hooks.d" explicitly to continue to load hooks from this directory"
time="2018-12-02T21:33:07-08:00" level=error msg="container create failed: container_linux.go:336: starting container process caused "process_linux.go:399: container init caused \"process_linux.go:382: running prestart hook 0 caused \\\"error running hook: exit status 1, stdout: , stderr: oh, noes!\\\\n\\\"\""
(I'd setup the hook to error out). You can see that it's silenly
ignoring the ENOENT for /usr/share/containers/oci/hooks.d and
continuing on to load hooks from /etc/containers/oci/hooks.d.
When it loads the hook, it also logs a warning-level message
suggesting that callers explicitly configure their hook directories.
That will help consumers migrate, so we can drop the implicit hook
directories in some future release. When folks *do* explicitly
configure hook directories (via the newly-public --hooks-dir and
hooks_dir options), we error out if they're missing:
$ podman --hooks-dir /does/not/exist run --rm docker.io/library/alpine echo 'successful container'
error setting up OCI Hooks: open /does/not/exist: no such file or directory
I've dropped the trailing "path" from the old, hidden --hooks-dir-path
and hooks_dir_path because I think "dir(ectory)" is already enough
context for "we expect a path argument". I consider this name change
non-breaking because the old forms were undocumented.
Coming back to rootless users, I've enabled hooks now. I expect they
were previously disabled because users had no way to avoid
/usr/share/containers/oci/hooks.d which might contain hooks that
required root permissions. But now rootless users will have to
explicitly configure hook directories, and since their default config
is from ~/.config/containers/libpod.conf, it's a misconfiguration if
it contains hooks_dir entries which point at directories with hooks
that require root access. We error out so they can fix their
libpod.conf.
[1]: https://github.com/containers/libpod/pull/1487#discussion_r218149355
Signed-off-by: W. Trevor King <wking@tremily.us>
Whe running unittests on newer golang versions, we observe failures with some
formatting types when no declared correctly.
Signed-off-by: baude <bbaude@redhat.com>
This is basically the same change as
ff47a4c2d5 (Use a struct to pass options to Checkpoint())
just for the Restore() function. It is used to pass multiple restore
options to the API and down to conmon which is used to restore
containers. This is for the upcoming changes to support checkpointing
and restoring containers with '--tcp-established'.
Signed-off-by: Adrian Reber <areber@redhat.com>
My host system runs Fedora Silverblue 29 and I have NetworkManager's
`dns=dnsmasq` setting enabled, so my `/etc/resolv.conf` only has
`127.0.0.1`.
I also run my development podman containers with `--net=host`
for various reasons.
If we have a host network namespace, there's no reason not to just
use the host's nameserver configuration either.
This fixes e.g. accessing content on a VPN, and is also faster
since the container is using cached DNS.
I know this doesn't solve the bigger picture issue of localhost-DNS
conflicting with bridged networking, but that's far more involved,
probably requiring a DNS proxy in the container. This patch
makes my workflow a lot nicer and was easy to write.
Signed-off-by: Colin Walters <walters@verbum.org>
Set the root propagation based on the properties of volumes and default
mounts. To remain compatibility, follow the semantics of Docker. If a
volume is shared, keep the root propagation shared which works for slave
and private volumes too. For slave volumes, it can either be shared or
rshared. Do not change the root propagation for private volumes and
stick with the default.
Fixes: #1834
Signed-off-by: Valentin Rothberg <vrothberg@suse.com>
CRIU supports to leave processes running after checkpointing:
-R|--leave-running leave tasks in running state after checkpoint
runc also support to leave containers running after checkpointing:
--leave-running leave the process running after checkpointing
With this commit the support to leave a container running after
checkpointing is brought to Podman:
--leave-running, -R leave the container running after writing checkpoint to disk
Now it is possible to checkpoint a container at some point in time
without stopping the container. This can be used to rollback the
container to an early state:
$ podman run --tmpfs /tmp --name podman-criu-test -d docker://docker.io/yovfiatbeb/podman-criu-test
$ curl 10.88.64.253:8080/examples/servlets/servlet/HelloWorldExample
3
$ podman container checkpoint -R -l
$ curl 10.88.64.253:8080/examples/servlets/servlet/HelloWorldExample
4
$ curl 10.88.64.253:8080/examples/servlets/servlet/HelloWorldExample
5
$ podman stop -l
$ podman container restore -l
$ curl 10.88.64.253:8080/examples/servlets/servlet/HelloWorldExample
4
So after checkpointing the container kept running and was stopped after
some time. Restoring this container will restore the state right at the
checkpoint.
Signed-off-by: Adrian Reber <areber@redhat.com>
For upcoming changes to the Checkpoint() functions this commit switches
checkpoint options from a boolean to a struct, so that additional
options can be passed easily to Checkpoint() without changing the
function parameters all the time.
Signed-off-by: Adrian Reber <areber@redhat.com>
/etc/resolv.conf and /etc/hosts should not be created and mounted when the
network is disabled.
We should not be calling the network setup and cleanup functions when it is
disabled either.
In doing this patch, I found that all of the bind mounts were particular to
Linux along with the generate functions, so I moved them to
container_internal_linux.go
Since we are checking if we are using a network namespace, we need to check
after the network namespaces has been created in the spec.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
We are seeing some issues where, when part of prepare() fails
(originally noticed due to a bad static IP), the other half does
not successfully clean up, and the state can be left in a bad
place (not knowing about an active SHM mount for example).
Signed-off-by: Matthew Heon <mheon@redhat.com>
it is not writeable by non-root users so there is no point in having
access to it from a container.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
for the purposes of performance and security, we use securejoin to contstruct
the root fs's path so that symlinks are what they appear to be and no pointing
to something naughty.
then instead of chrooting to parse /etc/passwd|/etc/group, we now use the runc user/group
methods which saves us quite a bit of performance.
Signed-off-by: baude <bbaude@redhat.com>
We implement the securejoin method to make sure the paths to /etc/passwd and
/etc/group are not symlinks to something naughty or outside the container
image. And then instead of actually chrooting, we use the runc functions to
get information about a user. The net result is increased security and
a a performance gain from 41ms to 100us.
Signed-off-by: baude <bbaude@redhat.com>
run prepare() -- which consists of creating a network namespace and
mounting the container image is now run in parallel. This saves 25-40ms.
Signed-off-by: baude <bbaude@redhat.com>
The newly introduced CRIU version check is now used to make sure
checkpointing and restoring is only used if the CRIU version is new
enough.
Signed-off-by: Adrian Reber <areber@redhat.com>
We already have functions for retrieving the container's CGroup
path, so use them instead of manually generating a path.
Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
We are still requiring oci-systemd-hook to be installed in order to run
systemd within a container. This patch properly mounts
/sys/fs/cgroup/systemd/libpod_parent/libpod-UUID on /sys/fs/cgroup/systemd inside of container.
Since we need the UUID of the container, we needed to move Systemd to be a config option of the
container.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
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>
Also update some missing fields libpod.conf obtions in man pages.
Fix sort order of security options and add a note about disabling
labeling.
When a process requests a new label. libpod needs to reserve all
labels to make sure that their are no conflicts.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Closes: #1406
Approved by: mheon
We don't want to allow users to write to /etc/resolv.conf or /etc/hosts if in read
only mode.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Closes: #1510
Approved by: TomSweeneyRedHat
As well as small style corrections, update pod_top_test to use CreatePod, and move handling of adding a container to the pod's namespace from container_internal_linux to libpod/option.
Signed-off-by: haircommander <pehunt@redhat.com>
Closes: #1187
Approved by: mheon
A pause container is added to the pod if the user opts in. The default pause image and command can be overridden. Pause containers are ignored in ps unless the -a option is present. Pod inspect and pod ps show shared namespaces and pause container. A pause container can't be removed with podman rm, and a pod can be removed if it only has a pause container.
Signed-off-by: haircommander <pehunt@redhat.com>
Closes: #1187
Approved by: mheon
Do not set any hostname value in the OCI configuration when --uts=host
is used and the user didn't specify any value. This prevents an error
from the OCI runtime as it cannot set the hostname without a new UTS
namespace.
Differently, the HOSTNAME environment variable is always set. When
--uts=host is used, HOSTNAME gets the value from the host.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Closes: #1280
Approved by: baude
Need to get some small changes into libpod to pull back into buildah
to complete buildah transition.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Closes: #1270
Approved by: mheon
Currently we add mounts from images, volumes and internal.
We can accidently over mount an existing mount. This patch sorts the mounts
to make sure a parent directory is always mounted before its content.
Had to change the default propagation on image volume mounts from shared
to private to stop mount points from leaking out of the container.
Also switched from using some docker/docker/pkg to container/storage/pkg
to remove some dependencies on Docker.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Closes: #1243
Approved by: mheon
This is a refresh of Dan William's PR #974 with a rebase and proper
vendoring of ocicni and containernetworking/cni. It adds the ability
to define multiple networks as so:
podman run --network=net1,net2,foobar ...
Signed-off-by: baude <bbaude@redhat.com>
Closes: #1082
Approved by: baude
podman now supports --volumes-from flag, which allows users
to add all the volumes an existing container has to a new one.
Signed-off-by: umohnani8 <umohnani@redhat.com>
Closes: #931
Approved by: mheon
Originally, it seemed like a good idea to place Conmon and the
container it managed under a shared CGroup, so we could manage
the two together. It's become increasingly clear that this is a
potential performance sore point, gains us little practical
benefit in managing Conmon, and adds extra steps to container
cleanup that interfere with Conmon postrun hooks.
Revert back to a shared CGroup for conmon processes under the
CGroup parent. This will retain per-pod conmon CGroups as well if
the pod is set to create a CGroup and act as CGroup parent for
its containers.
Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
Closes: #1051
Approved by: umohnani8
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
Ashley Cui
Valentin Rothberg
Giuseppe Scrivano
Matthew Heon
zhangguanzhang
OpenShift Merge Robot
Paul Holzinger
unknown
Radostin Stoyanov
Matthew Heon
Josh Soref
Daniel J Walsh
Andy Librian
Kir Kolyshkin
Eduardo Vega
Akihiro Suda
Qi Wang
Adrian Reber
Radostin Stoyanov
Jakub Filak
Urvashi Mohnani
Gabi Beyer
Sascha Grunert
baude
Peter Hunt
Jhon Honce
Sebastian Jug
W. Trevor King
Colin Walters
Valentin Rothberg
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