* `hack/local-up-cluster.sh` now enables the Node authorizer by default. Authorization modes can be overridden with the `AUTHORIZATION_MODE` environment variable, and the `ENABLE_RBAC` environment variable is no longer used. ([#49812](https://github.com/kubernetes/kubernetes/pull/49812), [@liggitt](https://github.com/liggitt))

- Added namespace access support to the CEL expressions of ValidatingAdmissionPolicy via a `namespaceObject`
  variable with expressions. ([#118267](https://github.com/kubernetes/kubernetes/pull/118267), [@cici37](https://github.com/cici37)) [SIG API Machinery and Testing]

- The certificate signer no longer accepts ca.key passwords via the `CFSSL_CA_PK_PASSWORD` environment variable. This capability was not prompted by user request, never advertised, and recommended against in the security audit. ([#84677](https://github.com/kubernetes/kubernetes/pull/84677), [@mikedanese](https://github.com/mikedanese))

k8s.io/client-go no longer default to a server address of `http://localhost:8080`. If you own one of these legacy clusters, you are *strongly* encouraged to secure your server. If you cannot secure your server, you can set the `$KUBERNETES_MASTER` environment variable to `http://localhost:8080` to continue defaulting the server address. `kubectl` users can also set the server address using the `--server` flag, or in a kubeconfig file specified via `--kubeconfig` or `$KUBECONFIG`. ([#86173](https://github.com/...

* Enable AttachVolumeLimit feature ([#69225](https://github.com/kubernetes/kubernetes/pull/69225), [@gnufied](https://github.com/gnufied))
* [GCP] Added env variables to control CPU requests of kube-controller-manager and kube-scheduler. ([#68823](https://github.com/kubernetes/kubernetes/pull/68823), [@loburm](https://github.com/loburm))

* CUSTOM_KUBE_DASHBOARD_BANNER environment variable will be used to populate notification banner in Kubernetes Dashboard add-on. ([#60639](https://github.com/kubernetes/kubernetes/pull/60639), [@konryd](https://github.com/konryd))

- Added authorization check support to the CEL expressions of ValidatingAdmissionPolicy via a `authorizer`

- Alpha implementation of Kubectl Command Headers: SIG CLI KEP 859 enabled when KUBECTL_COMMAND_HEADERS environment variable set on the client command line. ([#98952](https://github.com/kubernetes/kubernetes/pull/98952), [@seans3](https://github.com/seans3))
- Base-images: Update to debian-iptables:buster-v1.4.0
  - Uses iptables 1.8.5

OpenStack cloud provider can now be specified as environment variables. When we convert the OpenStack cloud provider to run in an external process, we can now use the kubernetes Secrets capability to inject the OS_* variables. This way we can specify the cloud configuration as a configmap, and specify secrets for the userid/password information. The configmap is mounted as a file, and the secrets are made available as environment variables. The external controller itself runs as a pod/daemonset. For...

*.test
/hack/.test-cmd-auth

# JUnit test output from ginkgo e2e tests
/junit*.xml

# Mercurial files
**/.hg
**/.hg*

# Vagrant
.vagrant
network_closure.sh

# Local cluster env variables
/cluster/env.sh

# Compiled binaries in third_party
/third_party/pkg

# Also ignore etcd installed by hack/install-etcd.sh
/third_party/etcd*
/default.etcd