Docs: Add docs for nerdctl support

.github/ISSUE_TEMPLATE/bug-report.md

@@ -21,7 +21,7 @@ labels: kind/bug
 **Environment:**
 
 - kind version: (use `kind version`):
-- Runtime info: (use `docker info` or `podman info`):
+- Runtime info: (use `docker info`, `podman info` or `nerdctl info`):
 - OS (e.g. from `/etc/os-release`):
 - Kubernetes version: (use `kubectl version`):
 - Any proxies or other special environment settings?:

README.md

@@ -5,7 +5,7 @@
 kind is a tool for running local Kubernetes clusters using Docker container "nodes".
 kind was primarily designed for testing Kubernetes itself, but may be used for local development or CI.
 
-If you have [go] 1.16+ and [docker] or [podman] installed `go install sigs.k8s.io/[email protected] && kind create cluster` is all you need!
+If you have [go] 1.16+ and [docker], [podman] or [nerdctl] installed `go install sigs.k8s.io/[email protected] && kind create cluster` is all you need!
 
 ![](site/static/images/kind-create-cluster.png)
 
@@ -145,6 +145,7 @@ Participation in the Kubernetes community is governed by the [Kubernetes Code of
 [go-supported]: https://golang.org/doc/devel/release.html#policy
 [docker]: https://www.docker.com/
 [podman]: https://podman.io/
+[nerdctl]: https://github.com/containerd/nerdctl
 [community page]: https://kubernetes.io/community/
 [Kubernetes Code of Conduct]: code-of-conduct.md
 [Go Report Card Badge]: https://goreportcard.com/badge/sigs.k8s.io/kind

pkg/cluster/provider.go

@@ -103,8 +103,8 @@ var NoNodeProviderDetectedError = errors.NewWithoutStack("failed to detect any s
 // Pass the returned ProviderOption to NewProvider to pass the auto-detect Docker
 // or Podman option explicitly (in the future there will be more options)
 //
-// NOTE: The kind *cli* also checks `KIND_EXPERIMENTAL_PROVIDER` for "podman" or
-// "docker" currently and does not auto-detect / respects this if set.
+// NOTE: The kind *cli* also checks `KIND_EXPERIMENTAL_PROVIDER` for "podman",
+// "nerctl" or "docker" currently and does not auto-detect / respects this if set.
 //
 // This will be replaced with some other mechanism in the future (likely when
 // podman support is GA), in the meantime though your tool may wish to match this.

site/content/_index.md

@@ -6,7 +6,7 @@ title: kind
 [kind] is a tool for running local Kubernetes clusters using Docker container "nodes".  
 kind was primarily designed for testing Kubernetes itself, but may be used for local development or CI.
 
-If you have [go] 1.16+ and [docker] or [podman] installed `go install sigs.k8s.io/kind@{{< stableVersion >}} && kind create cluster` is all you need!
+If you have [go] 1.16+ and [docker], [podman] or [nerdctl] installed `go install sigs.k8s.io/kind@{{< stableVersion >}} && kind create cluster` is all you need!
 
 <img src="images/kind-create-cluster.png" />
 
@@ -95,6 +95,7 @@ Participation in the Kubernetes community is governed by the [Kubernetes Code of
 [go-supported]: https://golang.org/doc/devel/release.html#policy
 [docker]: https://www.docker.com/
 [podman]: https://podman.io/
+[nerdctl]: https://github.com/containerd/nerdctl
 [community page]: https://kubernetes.io/community/
 [Kubernetes Code of Conduct]: https://github.com/kubernetes/community/blob/master/code-of-conduct.md
 [Go Report Card Badge]: https://goreportcard.com/badge/sigs.k8s.io/kind

site/content/docs/contributing/development.md

@@ -153,7 +153,7 @@ with kind at HEAD to have the latest fixes for running bleeding edge Kubernetes.
 We ensure that the tests continue to work in the kind repo before merging any code changes.
 
 We also have some limited usage experiments with [GitHub Actions], currently
-only for testing `podman` support in kind.
+only for testing `podman` or `nerdctl` support in kind.
 
 ### Configuration
 

site/content/docs/user/quick-start.md

@@ -144,6 +144,9 @@ wait for 30 seconds, do `--wait 30s`, for 5 minutes do `--wait 5m`, etc.
 
 More usage can be discovered with `kind create cluster --help`.
 
+The kind can auto-detect the [docker], [podman], or [nerdctl] installed and choose the available one. If you want to turn off the auto-detect, use the environment variable `KIND_EXPERIMENTAL_PROVIDER=docker`, `KIND_EXPERIMENTAL_PROVIDER=podman` or `KIND_EXPERIMENTAL_PROVIDER=nerdctl` to
+select the runtime.
+
 ## Interacting With Your Cluster
 
 After [creating a cluster](#creating-a-cluster), you can use [kubectl][kubectl]
@@ -433,6 +436,9 @@ kind, the Kubernetes cluster itself, etc.
 
 [modules]: https://github.com/golang/go/wiki/Modules
 [go-supported]: https://golang.org/doc/devel/release.html#policy
+[docker]: https://www.docker.com/
+[podman]: https://podman.io/
+[nerdctl]: https://github.com/containerd/nerdctl
 [known issues]: /docs/user/known-issues
 [releases]: https://github.com/kubernetes-sigs/kind/releases
 [node image]: /docs/design/node-image

site/content/docs/user/rootless.md

@@ -6,11 +6,12 @@ menu:
     identifier: "rootless"
     weight: 3
 ---
-Starting with kind 0.11.0, [Rootless Docker](https://docs.docker.com/go/rootless/) and [Rootless Podman](https://github.com/containers/podman/blob/master/docs/tutorials/rootless_tutorial.md) can be used as the node provider of kind.
+Starting with kind 0.11.0, [Rootless Docker](https://docs.docker.com/go/rootless/), [Rootless Podman](https://github.com/containers/podman/blob/master/docs/tutorials/rootless_tutorial.md) and [Rootless nerdctl](https://github.com/containerd/nerdctl/blob/main/docs/rootless.md) can be used as the node provider of kind.
 
 ## Provider requirements
 - Docker: 20.10 or later
 - Podman: 3.0 or later
+- nerdctl: 1.7 or later
 
 ## Host requirements
 The host needs to be running with cgroup v2.
@@ -80,5 +81,12 @@ On some distributions, you might need to use systemd-run to start kind into its
 $ systemd-run --scope --user kind create cluster
 ```
 
+## Creating a kind cluster with Rootless nerdctl
+
+To create a kind cluster with nerdctl, just run:
+```console
+$ KIND_EXPERIMENTAL_PROVIDER=nerdctl kind create cluster
+```
+
 ## Tips
 - To enable OOM watching, allow `dmesg` by running `sysctl -w kernel.dmesg_restrict=0`.