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allow fail close webhook admission
Webhook admission needs to allow failing closed. Even in an alpha state, I don't want to be one DDOS away from having an exposed cluster.
/assign caesarxuchao
/assign sttts
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allow */subresource in rbac policy rules
xref #29698
xref #38756
xref #49504
xref #38810
Allow `*/subresource` format in RBAC policy rules to support polymorphic subresources like `*/scale` for HPA.
@DirectXMan12 fyi
```release-note
RBAC PolicyRules now allow resource=`*/<subresource>` to cover `any-resource/<subresource>`. For example, `*/scale` covers `replicationcontroller/scale`.
```
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decode admission responses into a fresh object
Something about the way the admission request object is built causes decoding into back into it to fail with
```
W1013 14:10:42.457423 2960 admission.go:185] rejected by webhook namespacereservations.admission.online.openshift.io/apis/admission.online.openshift.io/v1alpha1/namespacereservations &{%!t(string=namespacereservations.admission.online.openshift.io/apis/admission.online.openshift.io/v1alpha1/namespacereservations) %!t(*errors.errorString=&{reflect.Value.Addr of unaddressable value})}: failed calling admission webhook "namespacereservations.admission.online.openshift.io/apis/admission.online.openshift.io/v1alpha1/namespacereservations": reflect.Value.Addr of unaddressable value
```
This simply creates a fresh object to decode into, which works fine for our usage and makes it possible to actually have the webhook call out to something.
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pkg/api: extract Scheme/Registry/Codecs into pkg/api/legacyscheme
This serves as
- a preparation for the pkg/api->pkg/apis/core move
- and makes the dependency to the scheme explicit when vizualizing
left depenncies.
The later helps with our our efforts to split up the monolithic repo
into self-contained sub-repos, e.g. for kubectl, controller-manager
and kube-apiserver in the future.
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fix the bad code comment
**What this PR does / why we need it**:
fix the bad code comment in scheduler
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
**Special notes for your reviewer**:
**Release note**:
```release-note
None
```
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Fix admission webhook test failure in go1.9
**What this PR does / why we need it**:
Go 1.9 has some better checks for SAN extensions, notably:
630e93ed2d
We recently added ServerName to the rest client TLSConfig:
186a0684d5 (diff-eb3573c6b11347dc3793c477726480efR262)
So we need to be sure that the ServerName "webhook-test.default.svc" is
present in the certificates that we generate."
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
Fixes#54020
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
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admission_test.go: remove unused functions
**What this PR does / why we need it**:
PR removed unused `createNamespaceForTest()` and `createSAForTest()` functions from `admission_test.go`.
**Release note**:
```release-note
NONE
```
PTAL @liggitt @pweil-
CC @simo5
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Change scheduler to skip pod with updates only on pod annotations
Fixes#52914, by checking whether the pod is already assumed before scheduling it.
**Release note**:
```
Scheduler cache ignores updates to an assumed pod if updates are limited to pod annotations.
```
/sig scheduling
/assign @bsalamat
/cc @vishh
Go 1.9 has some better checks for SAN extensions, notably:
630e93ed2d
We recently added ServerName to the rest client TLSConfig:
186a0684d5 (diff-eb3573c6b11347dc3793c477726480efR262)
So we need to be sure that the ServerName "webhook-test.default.svc" is
present in the certificates that we generate."
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Order PSP by name, prefer non-mutating PSPs
Fixes#36184Fixes#23217
Related to #23217
Removes unnecessary mutation of pods:
* Determines effective security context for pods using a wrapper containing the pod and container security context, rather than building/setting a combined struct on every admission
* Does not set `privileged:&false` on security contexts with `privileged:nil`
* Does not set `runAsNonRoot:&true` on security contexts that already have a non-nil, non-0 `runAsUser`
* Does not mutate/normalize container capabilities unless changes are required (missing defaultAddCapabilities or requiredDropCapabilities)
Defines behavior when multiple PSP objects allow a pod:
* PSPs which allow the pod as-is (no defaulting/mutating) are preferred
* If the pod must be defaulted/mutated to be allowed, the first PSP (ordered by name) to allow the pod is selected
* During update operations, when mutations to pod specs are disallowed, only non-mutating PSPs are used to validate the pod
```release-note
PodSecurityPolicy: when multiple policies allow a submitted pod, priority is given to ones which do not require any fields in the pod spec to be defaulted. If the pod must be defaulted, the first policy (ordered by name) that allows the pod is used.
```
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Modify Schedule function
**What this PR does / why we need it**:
It is obvious that no need to prioritizing when only one node after predicate.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
**Special notes for your reviewer**:
@davidopp @timothysc
**Release note**:
```release-note
NONE
```
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Added more unit tests for kube-scheduler.
**What this PR does / why we need it**:
Added more unit tests for kube-scheduler.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
NONE
**Special notes for your reviewer**:
NONE
**Release note**:
```release-note
NONE
```
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Make configFactory private
**What this PR does / why we need it**:
Fix TODO make this private if possible, so that only its interface is externally used.
I have check the use of configFactory and it is safe to make it private.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
**Release note**:
```release-note
NONE
```
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removes k8s.io/kubernetes/pkg/api dependency from the webhook plugin.
**What this PR does / why we need it**: removes `k8s.io/kubernetes/pkg/api` dependency from `webhook` plugin. The runtime.scheme can be injected to the webhook from the plugin initializer.
**Release note**:
```
NONE
```
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Move initializer plugin to the generic apiserver
* Moves `k8s.io/kuberentes/plugin/pkg/admission/initialization` to `k8s.io/apiserver/pkg/admission/plugin/initialization`
* Moves `k8s.io/kubernetes/pkg/kubeapiserver/admission/configuration` to `k8s.io/apiserver/pkg/admission/configuration`
* The initializer plugin used to depend on `k8s.io/kubernetes` because it does a type assertion of `api.Pod`. It tries to skip mirror pod. I converted that code to use the generic accessor pattern.
move k8s.io/kubernetes/plugin/pkg/admission/initialization to
k8s.io/apiserver/pkg/admission/plugin/initialization/initialization.go;
move k8s.io/kubernetes/pkg/kubeapiserver/admission/configuration to
k8s.io/apiserver/pkg/admission/configuration.
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Refresh scheduler equivalence cache when node taints changed.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#53425
**Release note**:
```release-note
None
```
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moves admission.v1alpha1.NewAdmissionReview method to webhook plugin
**What this PR does / why we need it**:
this is necessary, because the webhook plugin will be moved down to apiserver.
**Release note**:
```
NONE
```
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removes Authorizer and ExternalClientSet from kubeapiserver's admissi…
**What this PR does / why we need it**:
removes Authorizer and ExternalClientSet from kubeapiserver's admission initializer.
**Release note**:
```
NONE
```
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Refactor node taint conditions
**What this PR does / why we need it**:
We should use `not-ready` etc as node condition taint key.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*:
fixes#51246
**Special notes for your reviewer**:
**Release note**:
```release-note
Use `not-ready` to replace `notReady` in node condition taint keys.
```
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Fixed counting of unbound PVCs towards limit of attached volumes.
Count unbound PVCs to the limit of attached volumes to a node.
When MaxPDVolumeCountPredicate is in doubt (e.g. PVC or PV is missing), it assumes the volume is attached. It should assume the same when it encounters an unbound PVC. In any case, it should not return an error, it would stop scheduling all pods with a PVC.
Fixes: #53134
```release-note
NONE
```
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Apply algorithm in scheduler by feature gates.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: part of #42001
**Release note**:
```release-note
Apply algorithm in scheduler by feature gates.
```
