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Initial support for pod eviction based on disk
This PR adds the following:
1. node reports disk pressure condition based on configured thresholds
1. scheduler does not place pods on nodes reporting disk pressure
1. kubelet will not admit any pod when it reports disk pressure
1. kubelet ranks pods for eviction when low on disk
1. kubelet evicts greediest pod
Follow-on PRs will need to handle:
1. integrate with new image gc PR (https://github.com/kubernetes/kubernetes/pull/27199)
1. container gc policy should always run (will not be launched from eviction, tbd who does that)
1. this means kill pod is fine for all eviction code paths since container gc will remove dead container
1. min reclaim support will just poll summary provider (derek will do follow-on)
1. need to know if imagefs is same device as rootfs from summary (derek follow-on)
/cc @vishh @kubernetes/sig-node
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Quota was not counting services with multiple nodeports properly
```release-note
If a service of type node port declares multiple ports, quota on "services.nodeports" will charge for each port in the service.
```
Fixes https://github.com/kubernetes/kubernetes/issues/29456
/cc @kubernetes/rh-cluster-infra @sdminonne
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LimitRanger and PodSecurityPolicy need to check more on init containers
Container limits not applied to init containers. HostPorts not checked on podsecuritypolicy
@pweil- @derekwaynecarr
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Allow shareable resources for admission control plugins.
Changes allow admission control plugins to share resources. This is done via new PluginInitialization structure. The structure can be extended for other resources, for now it is an shared informer for namespace plugins (NamespiceLifecycle, NamespaceAutoProvisioning, NamespaceExists).
If a plugins needs some kind of shared resource e.g. client, the client shall be added to PluginInitializer and Wants methods implemented to every plugin which will use it.
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Improve scheduler throughput
Ref #28590
This improves scheduler throughput by another 10-15%.
@davidopp @kubernetes/sig-scheduling
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Return (bool, error) in Authorizer.Authorize()
Before this change, Authorize() method was just returning an error, regardless of whether the user is unauthorized or whether there is some other unrelated error. Returning boolean with information about user authorization and error (which should be unrelated to the authorization) separately will make it easier to debug.
Fixes#27974
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Func note not consistent with real fun name
File "plugin\pkg\webhook.go", line #41 :
"// New creates a new GenericWebhook from the provided kubeconfig file."
Here "New" not consistant with real fun name "NewGenericWebhook" in line #42 :
"func NewGenericWebhook(kubeConfigFile string, groupVersions []unversioned.GroupVersion, initialBackoff time.Duration) (*GenericWebhook, error) {"
Before this change, Authorize() method was just returning an error,
regardless of whether the user is unauthorized or whether there
is some other unrelated error. Returning boolean with information
about user authorization and error (which should be unrelated to
the authorization) separately will make it easier to debug.
Fixes#27974
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authorize based on user.Info
Update the `authorization.Attributes` to use the `user.Info` instead of discrete getters for each piece.
@kubernetes/sig-auth
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First step of optimizing PodAffinity priority function
Ref #26144
This is obviously only a first step - I will continue working on this code. However, this is changing the general scheme of computations to what is described in: https://github.com/kubernetes/kubernetes/issues/26144#issuecomment-232612384
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Optimise the process of the CalculateSpreadPriority in selector_spreading.go
It had better inspect if the nodeLister is normal first in the CalculateSpreadPriority in selector_spreading.go. If the nodeLister.List return error, the function return directly, not need deal the serviceLister and controllerLister and replicaSetLister.
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