Commit cc50aa9dfb introduced GetResourceStats, a method which collected
all the statistics from various cgroup controllers, only to discard all
of the info collected except a single value (memory usage).
While one may argue that this method can potentially be used from other
places, this did not happen since it was added 4+ years ago.
Let's streamline this code and only collect what we need, i.e. memory
usage. Rename the method accordingly.
While at it, fix pkg/kubelet/cm/cgroup_manager_unsupported.go to not
instantiate a new error every time a method is called.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
This was added by commit a9772b2290.
In the current codebase, the cgroup being updated was created using
runc/opencontainers' manager.Apply(), which already does controllers
propagation, so there is no need to repeat that on every update.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
FeatureGate acts as a secondary switch to disable cloud-controller loops
in KCM, Kubelet and KAPI.
Provide comprehensive logging information to users, so they will be
guided in adoption of out-of-tree cloud provider implementation.
Volumes that are provisioned with `VolumeMode: Block` often have a
MetrucsProvider interface declared in their type. However, the
MetricsProvider should implement a GetMetrics() function. In the cases
where the storage drivers do not implement GetMetrics(), a panic can
occur.
Usual type-assertions are not sufficient in this case. All assertions
assume the interface is present. There is no straight forward way to
verify that a valid GetMetrics() function is provided.
By adding SupportsMetrics(), storage driver implementations require
careful reviewing for metrics support.
PR #97972 added support for gathering metrics for Block PVCs provided by
CSI drivers. The in-tree drivers can support at leas the most basic
metric; Capacity.
Similar to how NewMetricsStatFS() works, the new NewMetricsBlock()
provides the GetMetrics() interface for Block volumes.
Additional metrics for Block volumes are difficult to gather. There is
no guarantee that there is a filesystem on the volume, which makes most
of the volume metrics useless.
Advanced storage might be able to detect the actual consumption (when
thin-provisioned) vs the capacity. However, this is out of the scope for
a standard helper function and requires intimate knowledge of the used
storage system.
This sets cgroup config via libcontainer to make sure we apply the
correct values to the systemd slices and scopes.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
runc rc95 contains a fix for CVE-2021-30465.
runc rc94 provides fixes and improvements.
One notable change is cgroup manager's Set now accept Resources rather
than Cgroup (see https://github.com/opencontainers/runc/pull/2906).
Modify the code accordingly.
Also update runc dependencies (as hinted by hack/lint-depdendencies.sh):
github.com/cilium/ebpf v0.5.0
github.com/containerd/console v1.0.2
github.com/coreos/go-systemd/v22 v22.3.1
github.com/godbus/dbus/v5 v5.0.4
github.com/moby/sys/mountinfo v0.4.1
golang.org/x/sys v0.0.0-20210426230700-d19ff857e887
github.com/google/go-cmp v0.5.4
github.com/kr/pretty v0.2.1
github.com/opencontainers/runtime-spec v1.0.3-0.20210326190908-1c3f411f0417
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
dbus 5.0.4 adds StoreProperty method which needs to be implemented for
the mock.
Fixes the errors like
> pkg/kubelet/nodeshutdown/systemd/inhibit_linux_test.go:88:9: cannot use f.fakeDBusObject (variable of type *fakeDBusObject) as dbus.BusObject value in return statement: missing method StoreProperty
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
kubelet is the only writer of v1.Node .status.images[].names. When an
image has neither RepoDigests nor RepoTags, the value gets stored in
etcd as null. Marking the field as optional can help JSON API clients
to avoid hitting serialization error when the returned status contains
null .status.images[].names.
