If the `subPath` is a file rather than a directory, Pods may fail to start ([#45613](https://github.com/kubernetes/kubernetes/issues/45613)).

  **Do not upgrade to v1.6.3** if your cluster may run Pods with such subPaths.

## Downloads for v1.6.3


filename | sha256 hash
-------- | -----------

images pull` before each `kubeadm init`. If you don't want the kubelet to pull any images at `kubeadm init` time, for example if you don't have an internet connection, you can also run `kubeadm config images pull` before `kubeadm init` or side-load the images some other way (such as `docker load -i image.tar`). Having the images locally cached will result in no pull at runtime, which makes it possible to run without any internet connection. ([#64096](https://github.com/kubernetes/kubernetes/pull/64096),...

  - true/strict - perform validation and error the request on any invalid fields in the ojbect. It will attempt to perform server-side validation if it is enabled on the apiserver, otherwise it will fall back to client-side validation.

  - `spec.signerName` is now required, and requests for `kubernetes.io/legacy-unknown` are not allowed to be created via the `certificates.k8s.io/v1` API
  - `spec.usages` is now required, may not contain duplicate values, and must only contain known usages
  - `status.conditions` may not contain duplicate types
  - `status.conditions[*].status` is now required

- Recursive Volume Ownership OnRootMismatch Option: Add a new “OnRootMismatch” policy that can help shorten the mount time for volumes that require ownership change and have many directories and files.

### Other notable announcements

SIG Network is moving IPv6 to Beta in Kubernetes 1.18, after incrementing significantly the test coverage with new CI jobs.

## Urgent Upgrade Notes 

### (No, really, you MUST read this before you upgrade)

* The "kubectl api-resources" command will no longer fail to display any resources on a single failure  ([#73035](https://github.com/kubernetes/kubernetes/pull/73035), [@juanvallejo](https://github.com/juanvallejo))

	determined at a per-pod level, with pods being isolated if there is
	any NetworkPolicy whose spec.podSelector targets them. Pods that are
	targeted by NetworkPolicies accept traffic that is accepted by any of
	the NetworkPolicies (and nothing else), and pods that are not targeted
	by any NetworkPolicy accept all traffic by default.
	Action Required:

Kubernetes 1.15 consists of **25 enhancements**: 2 moving to stable, 13 in beta, and 10 in alpha. The main themes of this release are:

#### Continuous Improvement
- Project sustainability is not just about features. Many SIGs have been working on  improving test coverage, ensuring the basics stay reliable, and stability of the core feature set and working on maturing existing features and cleaning up the backlog.

#### Extensibility

// https://www.iana.org/domains/root/db/maison.html
maison

// makeup : XYZ.COM LLC
// https://www.iana.org/domains/root/db/makeup.html
makeup

// man : MAN Truck & Bus SE
// https://www.iana.org/domains/root/db/man.html
man

// management : Binky Moon, LLC
// https://www.iana.org/domains/root/db/management.html
management

// mango : PUNTO FA S.L.