After this commit, when LimitedSwap is enabled,
containers would get swap acess limited with respect
the container memory request, total physical memory
on the node, and the swap size on the node.
Pods of Best-Effort / Guaranteed QoS classes don't get
to swap. In addition, container with memory requests
that are equal to their memory limits also don't get to
swap.
The swap limitation is calculated in the following way:
1. Calculate the container's memory proportionate to the node's memory:
- Divide the container's memory request by the total node's physical memory.
Let's call this value ContainerMemoryProportion.
2. Multiply the container memory proportion by the available
swap memory for Pods:
Meaning: ContainerMemoryProportion * TotalPodsSwapAvailable.
Fore more information:
https://github.com/kubernetes/enhancements/blob/master/keps/sig-node/2400-node-swap/README.md
Signed-off-by: Itamar Holder <iholder@redhat.com>
Previously, callers of `Exists()` would not know why the cGroup was or
was not existing. In one call-site in particular, the `kubelet` would
entirely fail to start if the cGroup validation did not succeed. In
these cases we MUST explain what went wrong and pass that information
clearly to the caller. Previously, some but not all of the reasons for
invalidation were logged at a low log-level instead. This led to poor
UX.
The original method was retained on the interface so as to make this
diff small.
Signed-off-by: Steve Kuznetsov <skuznets@redhat.com>
Fix an issue in which, when trying to specify the `--kube-reserved-cgroup`
(or `--system-reserved-cgroup`) with `--cgroup-driver=systemd`, we will
not properly convert the `systemd` cgroup name into the internal cgroup
name that k8s expects. Without this change, specifying
`--kube-reserved-cgroup=/test.slice --cgroup-driver=systemd` will fail,
and only `--kube-reserved-cgroup=/test --crgroup-driver=systemd` will succeed,
even if the actual cgroup existing on the host is `/test.slice`.
Additionally, add light unit testing of our process from converting to a
systemd cgroup name to kubernetes internal cgroup name.
- Move from the old github.com/golang/glog to k8s.io/klog
- klog as explicit InitFlags() so we add them as necessary
- we update the other repositories that we vendor that made a similar
change from glog to klog
* github.com/kubernetes/repo-infra
* k8s.io/gengo/
* k8s.io/kube-openapi/
* github.com/google/cadvisor
- Entirely remove all references to glog
- Fix some tests by explicit InitFlags in their init() methods
Change-Id: I92db545ff36fcec83afe98f550c9e630098b3135
