This migrates uses of github.com/opencontainers/runc/libcontainer/user
to the new github.com/moby/sys/user module, which was extracted from
runc at commit [opencontainers/runc@a3a0ec48c4].
This is the initial release of the module, which is a straight copy, but
some changes may be made in the next release (such as fixing camel-casing
in some fields and functions (Uid -> UID).
[opencontainers/runc@a3a0ec48c4]: a3a0ec48c4
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
crun 1.4.3 as well as runc 1.1 both support to open bind-mounts before
dropping privileges, as they are inaccessible after switching to the
user namespace. So that is the minimum version to use with containerd
1.7.
Also, since containerd 2.0 we use idmap mounts for files mounted in the
container created by containerd (like etc/hostname, etc/hosts, etc.), so
in that case we require newer OCI runtimes too. However, as the kubelet
doesn't request idmap mounts for kube volumes, we can lower the kernel
version.
Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>
Userns requires idmap mounts or to opt-in for a slow and expensive
chown. As idmap mounts support for overlayfs was merged in 5.19, let's
add the slow_chown config for our CI.
The config is harmless to keep it in new kernels, as if idmap mounts is
supported, it will be just used. Whenever all our CI is run with kernels
>= 5.19, we can remove this setting.
Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>
If we don't use idmap mounts, doing a chown per pod is very expensive:
it implies duplicating the container storage for the image for every pod
and the latency to start a new pod is affected too.
Let's make sure users are aware of this, by having them opt-in, for
snapshotters that we have a better solution (like overlayfs, that has
support for idmap mounts).
Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>
Deprecate the pacakge, but suppress linting errors for now. This is to allow
backporting these changes to release branches, which may still need to transition.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This "soft" deprecates the package, but keeps the local uses of the package,
which can make backporting this to release-branches easier (we can
still move all uses in those branches as well though).
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
When a shim process is unexpectedly killed in a way that was not initiated through containerd - containerd reports the pod as not ready but the containers as running. This results in kubelet repeatedly sending container kill requests that fail since containerd cannot connect to the shim.
Changes:
- In the container exit handler, treat `err: Unavailable` as if the container has already exited out
- When attempting to get a connection to the shim, if the controller isn't available assume that the shim has been killed (needs to be done since we have a separate exit handler that cleans up the reference to the shim controller - before kubelet has the chance to call StopPodSandbox)
Signed-off-by: Aditya Ramani <a_ramani@apple.com>
