A pod that has been rejected by admission will have status manager
set the phase to Failed locally, which make take some time to
propagate to the apiserver. The rejected pod will be included in
admission until the apiserver propagates the change back, which
was an unintended regression when checking pod worker state as
authoritative.
A pod that is terminal in the API may still be consuming resources
on the system, so it should still be included in admission.
The configuration is deprecated and targets removal for v1.23. Tests
cases have been changed as well.
Signed-off-by: Sascha Grunert <sgrunert@redhat.com>
Fixes two issues with how the pod worker refactor calculated the
pods that admission could see (GetActivePods() and
filterOutTerminatedPods())
First, completed pods must be filtered from the "desired" state
for admission, which arguably should be happening earlier in
config. Exclude the two terminal pods states from GetActivePods()
Second, the previous check introduced with the pod worker lifecycle
ownership changes was subtly wrong for the admission use case.
Admission has to include pods that haven't yet hit the pod worker,
which CouldHaveRunningContainers was filtering out (because the
pod worker hasn't seen them). Introduce a weaker check -
IsPodKnownTerminated() - that returns true only if the pod is in
a known terminated state (no running containers AND known to pod
worker). This weaker check may only be called from components that
need admitted pods, not other kubelet subsystems.
This commit does not fix the long standing bug that force deleted
pods are omitted from admission checks, which must be fixed by
having GetActivePods() also include pods "still terminating".
This is a knob added by runc 1.0.2 specifically for kubernetes,
which tells runc/libcontainer/cgroups/systemd v1 manager to not
freeze the cgroup in Set().
We set this knob here because this code is only used for pods
(rather than containers) management, and in this place we create or
update the pod cgroup with no device limits set, so we can skip the
freeze.
If this knob is not set, libcontainer's cgroup v1 manager tries to
figure out whether the freeze is needed or not, but it's a somewhat
expensive check to perform, thus the knob is a shortcut.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
* Change uses of whitelist to allowlist in kubelet sysctl
* Rename whitelist files to allowlist in Kubelet sysctl
* Further renames of whitelist to allowlist in Kubelet
* Rename podsecuritypolicy uses of whitelist to allowlist
* Update pkg/kubelet/kubelet.go
Co-authored-by: Danielle <dani@builds.terrible.systems>
Co-authored-by: Danielle <dani@builds.terrible.systems>
