tracking issue for Windows support

[neolit123]

kubernetes/enhancements tracking issue:

• Kubeadm for Windows enhancements#995

KEP was added here:

• Kubeadm for Windows KEP enhancements#994

---

GA graduation:

• kubeadm is actively being tested by the CAPZ provider:
  https://github.com/kubernetes-sigs/cluster-api-provider-azure

• add a dedicated task page for "adding windows nodes":
  Cannot find page about adding Windows nodes website#34476

  • kubeadm: add task pages for adding Linux and Windows worker nodes website#47888

• the kube-proxy image for Windows is still not auto-build on k8s releases

  • not sure if we have tracking issue for that. currently we are building kube-proxy on demand from the k-sigs/sig-windows-tools repo

• kube-proxy / CNI on Windows need a contract, which might require some wider ecosystem changes:

  • Establish contract between kube-proxy on Windows and CNIs for handling source VIPs in overlay networking mode kubernetes#123014

---

beta graduation:

• split kubelet flags per OS
  assigned: @gab-satchi
  PR: Windows specific kubelet flags in kubeadm-flags.env kubernetes#88287

- [ ] upgrades
upgrades were delegated to documentation and having scripts for the process is not really needed.

• add remaining scripts to sig-windows-tools
  assigned: @benmoss
  PR: Add scripts/manifests for new daemonset kubeadm approach kubernetes-sigs/sig-windows-tools#34

• set up e2e tests
  assigned: @benmoss @neolit123
  PRs: sig-windows: add kubeadm job on GCP test-infra#16718
  Add script for deploying/testing a cluster on GCE kubernetes-sigs/sig-windows-tools#39
  https://k8s-testgrid.appspot.com/sig-windows#kubeadm-windows-gcp-k8s-stable
  status: debugging e2e failures / flakes.

• finalize the documentation
  assigned: @benmoss
  PR: Update kubeadm for Windows website#19217
  status: merged

---

alpha graduation:

as list of cleanup changes that we can do regardless:

• fix Windows related paths and defaults
  assigned: @ksubrmnn
  PR: kubelet: use drive letters for the default paths on Windows kubernetes#77710
  PR: Implement CRI detection for Windows kubernetes#78053

• kube-proxy retry mechanic
  assigned: @ksubrmnn
  PR: Kube-Proxy wait when HNS network not found kubernetes#78612

• flanneld should support a flag for its config
  assigned: @neolit123
  PR: main.go: add the "net-config-path" flag flannel-io/flannel#1136

• docs
  assigned @ksubrmnn
  PR: Create kubeadm-windows.md website#14644

• install script
  assigned @ksubrmnn
  PR: Script to set up Windows node with Kubeadm kubernetes-sigs/sig-windows-tools#1
  PR: TODO

---

side work:

• fix wrongly defaulted kubelet flags on windows:
  PR: TODO
  windows: mutate additional kubeletconfiguration fields on join #2967

• add preflight checks (if needed)
  assigned: @benmoss
  PR: TODO
  possibly only support 1803+?
  also see https://github.com/kubernetes/kubernetes/blob/0f93328c7a051e28a097270daaf7a7ff6f90bae0/cmd/kubeadm/app/util/system/types_windows.go

• don't depend on powershell calls
  both kubeadm and pkg/util/initsystem depend on powershell.
  these should be system calls instead.
  assigned: @ksubrmnn
  PR: Use os package for Windows IsPrivilegedUserCheck kubernetes#77989
  PR: Use Service Control Manager as the Windows Initsystem kubernetes#78189
  PR: TODO
  system checks still have this https://github.com/kubernetes/kubernetes/blob/0f93328c7a051e28a097270daaf7a7ff6f90bae0/cmd/kubeadm/app/util/system/types_windows.go

• fix the symbolic links that are currently required in https://github.com/kubernetes-sigs/sig-windows-tools/blob/master/kubeadm/scripts/PrepareNode.ps1#L65
  see windows: kubelet tries to load C:\var\lib\kubelet\etc\kubernetes\pki\ca.crt #2330
  windows: absolute paths do not work properly in config files #2419

---

/kind feature
/area ecosystem
/priority important-longterm
/assign

cc @michmike @PatrickLang

[neolit123]

WIP google doc for ideas:
https://docs.google.com/document/d/1yaT7K85qMvZD7Q-ejWHBko1fgGaeGtjGLEZZ_Bz63VA/edit?usp=sharing

[neolit123]

kubernetes/enhancements tracking issue:
kubernetes/enhancements#995

KEP was added here:
kubernetes/enhancements#994

[neolit123]

update the OP with:

as list of cleanup changes that we can do regardless: