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Mention built-in CRI support in README

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Signed-off-by: James Jackson <james.sorley.jackson@gmail.com>
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James Jackson 2020-12-03 13:03:33 -06:00
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@ -249,6 +249,53 @@ the autocomplete/ctr file in your `.bashrc`, or manually like:
$ source ./contrib/autocomplete/ctr
```
### CRI
`cri` is a [containerd](https://containerd.io/) plugin implementation of Kubernetes [container runtime interface (CRI)](https://github.com/kubernetes/cri-api/blob/master/pkg/apis/runtime/v1alpha2/api.proto).
With it, you could run Kubernetes using containerd as the container runtime.
![cri](./docs/cri.png)
#### Current Status
`cri` is a native plugin of containerd 1.1 and above. It is built into containerd and enabled by default.
> **Note:** `cri` as of containerd 1.5, the cri plugin is merged into the containerd/containerd repo. For example, the source code previously stored under [`containerd/cri/pkg`](https://github.com/containerd/cri/tree/release/1.4/pkg)
was moved to [`containerd/containerd/pkg/cri` package](https://github.com/containerd/containerd/tree/master/pkg/cri).
`cri` is in GA:
* It is feature complete.
* It (the GA version) works with Kubernetes 1.10 and above.
* It has passed all [CRI validation tests](https://github.com/kubernetes/community/blob/master/contributors/devel/sig-node/cri-validation.md).
* It has passed all [node e2e tests](https://github.com/kubernetes/community/blob/master/contributors/devel/sig-node/e2e-node-tests.md).
* It has passed all [e2e tests](https://github.com/kubernetes/community/blob/master/contributors/devel/sig-testing/e2e-tests.md).
See [test dashboard](https://k8s-testgrid.appspot.com/sig-node-containerd)
#### Production Quality Cluster on GCE
For a production quality cluster on GCE brought up with `kube-up.sh` refer [here](docs/cri/kube-up.md).
#### Installing with Ansible and Kubeadm
For a multi node cluster installer and bring up steps using ansible and kubeadm refer [here](contrib/ansible/README.md).
#### Custom Installation
For non ansible users, you can download the `cri-containerd` release tarball and deploy
kubernetes cluster using kubeadm as described [here](docs/installation.md).
#### Validate Your `cri` Setup
A Kubernetes incubator project called [cri-tools](https://github.com/kubernetes-sigs/cri-tools)
includes programs for exercising CRI implementations such as the `cri` plugin.
More importantly, cri-tools includes the program `critest` which is used for running
[CRI Validation Testing](https://github.com/kubernetes/community/blob/master/contributors/devel/sig-node/cri-validation.md).
#### CRI Plugin Testing Guide
See [here](./docs/cri/testing.md) for information about CRI plugin testing.
#### Using crictl
See [here](./docs/cri/crictl.md) for information about using `crictl` to debug
pods, containers, and images.
#### Configurations
See [here](./docs/cri/config.md) for information about how to configure cri plugins
and [here](https://github.com/containerd/containerd/blob/master/docs/man/containerd-config.8.md)
for information about how to configure containerd
#### Distribution of `ctr` autocomplete for bash and zsh
For bash, copy the `contrib/autocomplete/ctr` script into