Stop using gs://kubernetes-release bucket, use dl.k8s.io for downloads

[afbjorklund]

The downloads should be using "dl.k8s.io" instead.

The hardcoded urls might cause a problem in the future
(like is happening today, with the registry and packages)

i.e. no more storage.googleapis.com/kubernetes-release

---

See:

• Deprecate and migrate away from gs://kubernetes-release k8s.io#2396

[afbjorklund]

@medyagh another google infrastructure cleanup item...

https://dl.k8s.io/release/stable.txt -->
https://storage.googleapis.com/kubernetes-release/release/stable.txt

I guess it also affects the "minikube" subdirectory, eventually ?

But primarily it was about kubeadm/kubelet/kubectl downloads:

// DefaultKubeBinariesURL returns a URL to kube binaries
func DefaultKubeBinariesURL() string {
        return fmt.Sprintf("https://%s/kubernetes-release/release", downloadHost)
}

var downloadHost = "storage.googleapis.com" (plus mirror)

The hardcoded bucket subdirectory needs go in the url/host instead.

[afbjorklund]

Current procedure follows upstream: ("Without a package manager")
https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/#installing-kubeadm-kubelet-and-kubectl

sudo curl -L --remote-name-all https://storage.googleapis.com/kubernetes-release/release/${RELEASE}/bin/linux/${ARCH}/{kubeadm,kubelet,kubectl}
sudo chmod +x {kubeadm,kubelet,kubectl}

        base := fmt.Sprintf("%s/%s/bin/%s/%s/%s", binaryURL, version, osName, archName, binaryName)

[afbjorklund]

Now changed to use "dl.k8s.io" (and removed kubectl)

• “Installing kubeadm” recommends downloads from non-canonical (?) URLs website#33228

[sftim]

We are also keen to reduce our reliance on GCP (as in, on only GCP) due to financial concerns.

[afbjorklund]

Note that:

Most minikube users will get their binaries from the "preload" (GCS), not from the dl.k8s.io

If the Kubernetes project really wanted to make the downloads smaller, it would use .tar.xz ?

45M	kubeadm
46M	kubectl
116M	kubelet
207M	total

14M	kubeadm.tar.xz
15M	kubectl.tar.xz
30M	kubelet.tar.xz
58M	total

---

Should still do this change. Will make a PR...

Wonder if dl.k8s.io also works in China ?

[sftim]

The approach we recommend for end users subject to state-level censorship is to use a trusted mirror within their state's allowed boundary (we don't provide such a mirror).

[afbjorklund]

OK, will continue to use the current mirror then.

        // Mirror CN
        AliyunMirror = "registry.cn-hangzhou.aliyuncs.com/google_containers"
...
        // ImageRepositories contains all known image repositories
        ImageRepositories = map[string][]string{
                "global": {""},
                "cn":     {AliyunMirror},
        }

        aliyunMirror = "kubernetes.oss-cn-hangzhou.aliyuncs.com"
        downloadHost = "storage.googleapis.com"

[afbjorklund]

Seem to be confusing GCR and GCS while typing, too close alphabetically...

Also, it seems that https://dl.k8s.io/stable.txt does not exist (so sed failed)