Automatic merge from submit-queue
Add initializer support to admission and uninitialized filtering to rest storage
Initializers are the opposite of finalizers - they allow API clients to react to object creation and populate fields prior to other clients seeing them.
High level description:
1. Add `metadata.initializers` field to all objects
2. By default, filter objects with > 0 initializers from LIST and WATCH to preserve legacy client behavior (known as partially-initialized objects)
3. Add an admission controller that populates .initializer values per type, and denies mutation of initializers except by certain privilege levels (you must have the `initialize` verb on a resource)
4. Allow partially-initialized objects to be viewed via LIST and WATCH for initializer types
5. When creating objects, the object is "held" by the server until the initializers list is empty
6. Allow some creators to bypass initialization (set initializers to `[]`), or to have the result returned immediately when the object is created.
The code here should be backwards compatible for all clients because they do not see partially initialized objects unless they GET the resource directly. The watch cache makes checking for partially initialized objects cheap. Some reflectors may need to change to ask for partially-initialized objects.
```release-note
Kubernetes resources, when the `Initializers` admission controller is enabled, can be initialized (defaulting or other additive functions) by other agents in the system prior to those resources being visible to other clients. An initialized resource is not visible to clients unless they request (for get, list, or watch) to see uninitialized resources with the `?includeUninitialized=true` query parameter. Once the initializers have completed the resource is then visible. Clients must have the the ability to perform the `initialize` action on a resource in order to modify it prior to initialization being completed.
```
Automatic merge from submit-queue (batch tested with PRs 41954, 40528, 41875, 41165, 41877)
preflight check external etcd version when kubeadm init
**What this PR does / why we need it**:
1. preflight check if verson of external etcd server meets the demand of kubeadm, currently requires >= 3.0.14
2. support mixed http endpoints and https endpoints
**Which issue this PR fixes** : fixes https://github.com/kubernetes/kubeadm/issues/174
**Special notes for your reviewer**:
i have tested against single endpoint including http etcd server , https etcd server, but multiple endpoints not tested yet. i'll do it tomorrow
Automatic merge from submit-queue (batch tested with PRs 41701, 41818, 41897, 41119, 41562)
kubeadm: Secure the control plane communication and add the kubeconfig phase command
**What this PR does / why we need it**:
This generates kubeconfig files for the controller-manager and the scheduler, ref: https://github.com/kubernetes/kubeadm/issues/172
The second commit adds the `kubeadm alpha phase kubeconfig` command as described in the design doc: https://github.com/kubernetes/kubeadm/pull/156
**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**:
@dmmcquay What kind of tests would you like for the kubeconfig phase command?
**Release note**:
```release-note
```
@jbeda @mikedanese @dmmcquay @pires @liggitt @deads2k @errordeveloper
Automatic merge from submit-queue (batch tested with PRs 38101, 41431, 39606, 41569, 41509)
kubeadm: Reorder the token packages more logically
**What this PR does / why we need it**:
In order to be able to implement https://github.com/kubernetes/kubernetes/pull/41417, the token functionality (which now is spread across the codebase), should be in two places: a generic token functions library, which in the future _may_ [move into client-go](https://github.com/kubernetes/kubernetes/pull/41281#discussion_r101357106) in some form, and a package for the token handling against the api server.
This commit has no large functional changes.
```
kubeadm: Aggregate the token functionality in sane packages.
- Factor out token constants to kubeadmconstants.
- Move cmd/kubeadm/app/util/{,token/}tokens.go
- Use the token-id, token-secret, etc constants provided by the bootstrapapi package
- Move cmd/kubeadm/app/master/tokens.go to cmd/kubeadm/app/phases/token/csv.go
This refactor basically makes it possible to hook up kubeadm to the BootstrapSigner controller later on
```
**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
```
@mikedanese @pires @errordeveloper @dmmcquay @jbeda @GheRivero
Automatic merge from submit-queue (batch tested with PRs 41505, 41484, 41544, 41514, 41022)
add front proxy to kubeadm created kube-apiservers
The front proxy authenticator configuration has been in a release or two. It allows a front proxy (secured by mutual TLS auth) to provide user information for a request. The kube-aggregator uses this to securely terminate authentication (has to terminate TLS and thus client-certs) and communicate user info to backing API servers.
Since the kube-apiserver always verifies the front-proxy via a client certificate, this isn't open for abuse unless you already have access to either the signing key or client cert which kubeadm creates locally. If you got there, you already owned the box. Therefore, this adds the authenticator unconditionally.
@luxas Are there e2e tests for `kubeadm`?
@liggitt @kubernetes/sig-auth-misc
- Factor out token constants to kubeadmconstants.
- Move cmd/kubeadm/app/util/{,token/}tokens.go
- Use the token-id, token-secret, etc constants provided by the bootstrapapi package
- Move cmd/kubeadm/app/master/tokens.go to cmd/kubeadm/app/phases/token/csv.go
This refactor basically makes it possible to hook up kubeadm to the BootstrapSigner controller later on
Automatic merge from submit-queue (batch tested with PRs 41466, 41456, 41550, 41238, 41416)
add check to authorization config
Prompt user to create the config when using abac/webhook.
Lucas Käldström