Add a new directory/remote builder - new modes to specify k8s binaries to build node-images

[dims]

Related to #381

Enabling the following command lines to build node image

1. Specify a tar gzipped file from a local disk or from an url

kind build node-image $HOME/Downloads/kubernetes-server-linux-amd64.tar.gz
kind build node-image --type url https://dl.k8s.io/v1.30.0/kubernetes-server-linux-arm64.tar.gz

This is aimed at someone who may have a different build system and do not use the k8s make file targets, but would love to build a node image for kind with their own patches and build systems

kind build node-image v1.30.0

This is aimed at the majority of the current requests on slack and other avenues who just want to play with a version we haven't created a node image for (but has an upstream k8s tag and release artifacts)

Please take a look!

Here are the list of files and directory structure needed by the new builder in the tar gzipped file (including the kubernetes directory. which should be at the root of the passed in root directory)

kubernetes
└── server
    └── bin
        ├── kube-apiserver.docker_tag
        ├── kube-apiserver.tar
        ├── kube-controller-manager.tar
        ├── kube-proxy.tar
        ├── kube-scheduler.tar
        ├── kubeadm
        ├── kubectl
        └── kubelet

With this PR, here are some of the possibilities:

kind build node-image https://dl.k8s.io/v1.30.0/kubernetes-server-linux-arm64.tar.gz
kind build node-image $HOME/Downloads/kubernetes-server-linux-amd64.tar.gz
kind build node-image v1.30.0
kind build node-image $HOME/go/src/k8s.io/kubernetes/

kind build node-image --type url https://dl.k8s.io/v1.30.0/kubernetes-server-linux-arm64.tar.gz
kind build node-image --type file $HOME/Downloads/kubernetes-server-linux-amd64.tar.gz
kind build node-image --type release v1.30.0
kind build node-image --type source $HOME/go/src/k8s.io/kubernetes/

kind build node-image

[dims]

built an image using:

kind build node-image v1.30.0

and looks like that does build the node image properly

$ kind create cluster --image kindest/node:latest
Creating cluster "kind" ...
 ✓ Ensuring node image (kindest/node:latest) 🖼
 ✓ Preparing nodes 📦
 ✓ Writing configuration 📜
 ✓ Starting control-plane 🕹️
 ✓ Installing CNI 🔌
 ✓ Installing StorageClass 💾
Set kubectl context to "kind-kind"
You can now use your cluster with:

kubectl cluster-info --context kind-kind

Have a nice day! 👋

$ kubectl cluster-info --context kind-kind
Kubernetes control plane is running at https://127.0.0.1:35929
CoreDNS is running at https://127.0.0.1:35929/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy

To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.

[dims]

/retest

[dims]

@BenTheElder @aojea here's what i came up with. Please verify if we can go with this.

--type	CLI parameter	Action
NONE	NONE	Autodetect k8s directory to build
NONE	resolves as a Directory	Use directory as source to build
NONE	resolves as a tarball file	Treat as binary tar ball
NONE	parses as a semver	Download from dl.k8s.io
NONE	parses as a url	Download binary tarball
source	Directory	Use directory as source to build
file	tarball file	Treat as binary tar ball
release	semver	Download from dl.k8s.io
url	URL to tarball	Download binary tarball

[dims]

@stmcginnis @aojea @BenTheElder here are the latest command lines i tested. If these are good, then i'll update the docs in this PR itself.

kind build node-image https://dl.k8s.io/v1.30.0/kubernetes-server-linux-arm64.tar.gz
kind build node-image $HOME/junk/kubernetes-server-linux-amd64.tar.gz
kind build node-image v1.30.0
kind build node-image $HOME/go/src/k8s.io/kubernetes/

kind build node-image --type url https://dl.k8s.io/v1.30.0/kubernetes-server-linux-arm64.tar.gz
kind build node-image --type file ~/junk/kubernetes-server-linux-amd64.tar.gz
kind build node-image --type release v1.30.0
kind build node-image --type source $HOME/go/src/k8s.io/kubernetes/

kind build node-image

[stmcginnis]

This looks reasonable to me - thanks @dims!

[dims]

Updated docs and CLI help. thanks @stmcginnis

@aojea @BenTheElder PTAL

[dims]

We'll want to add a note that modes other than source directory are only kind v0.24+

Done!

[dims]

@BenTheElder is VM / VM (Fedora) (docker, rootless) (pull_request) failure a flake? exec format error seems like something wrong in the GH action itself?

[aojea]

/lgtm
Thank you very much Dims, this is really great

[dims]

Thank you very much Dims, this is really great

thanks @aojea !

/assign @BenTheElder

[stmcginnis]

I can see this being very useful!

/lgtm

[stmcginnis]

Thanks @dims!

/lgtm

[dims]

/test pull-kind-e2e-kubernetes-1-29

[BenTheElder]

@BenTheElder is VM / VM (Fedora) (docker, rootless) (pull_request) failure a flake? exec format error seems like something wrong in the GH action itself?

yeah, that sounds like a failed download or bad binfmt_misc, we have some flakes in these jobs with the environment and some flakes in prow with the e2e tests (like #3609, still waiting for those backports to merge)

[BenTheElder]

/lgtm
/approve

thanks dims! 🎉

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[tanvp112]

Hi, this is a kind v0.24.0 feature, right? Any thought when this will be release. Thanks!

[BenTheElder]

It is. When we're ready. There are other essentials to sort out and all of us only work on kind part time so no particular ETA.

you can install kind @ HEAD with the makefile, instructions in the docs, but it won't be fully supported yet and we may make some changes before releasing.