kubernetes/preinstall: Add Debian 11 (bullseye) support

[rtsp]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Several packages was removed from Debian 11 (bullseye) resulting to kubespray deploy failed on bullseye target.

This PR just add a new required_pkgs vars file specifically for Debian 11 and fix these issues

• python-apt removed => change to python3-apt
• aufs-tools removed => remove from a list (previously used in older version of Docker)
• gnupg not installed by default => install gnupg before running apt_key
  • This fix container-engine/containerd : ensure containerd repository public key is installed task failed

kubespray/roles/kubernetes/preinstall/vars/debian-11.yml

Lines 1 to 7 in b72f8cd

	---
	required_pkgs:
	- python3-apt
	- gnupg
	- apt-transport-https
	- software-properties-common
	- conntrack

Which issue(s) this PR fixes:

N/A

Special notes for your reviewer:

This PR was successfully tested on my cluster with following details

My Test Cluster

• 3 nodes - 3 masters, worker in master node (4 CPU, 4 GB each)
• Debian 11 (bullseye) netinst+ssh
• Restore from snapshot to clean-install state before each test

Inventory Configuration & Add-ons

1. k8s v1.21.1 with containerd + etcd(host)
2. k8s v1.21.3 with containerd + etcd(host)
3. k8s v1.21.3 with containerd + etcd(host) + helm + metrics_server + ingress_nginx + cert_manager + metallb
4. k8s v.1.21.3 with docker + etcd(docker)
5. k8s v.1.21.3 with docker + etcd(docker) + helm + metrics_server + ingress_nginx + cert_manager + metallb

Does this PR introduce a user-facing change?:

Add Debian 11 support

[k8s-ci-robot]

Hi @rtsp. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[rtsp]

/retest

[k8s-ci-robot]

@rtsp: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[floryut]

We would need at least one CI test to add this OS as a supported one.

[rtsp]

We would need at least one CI test to add this OS as a supported one.

@floryut Could we reconsider about merging this PR before the CI Tests for Debian 11 is available?

Since the python-apt package is removed from Debian 11 so it's impossible to deploy current Kubespray on Debian 11 in any case.

kubespray/roles/kubernetes/preinstall/vars/debian.yml

Lines 2 to 3 in 425b674

	required_pkgs:
	- python-apt

This PR just add extra vars file debian-11.yml that don't touch any other part of the Kubespray. At least, this would help Debian 11 users to be able to deploy for now.

kubespray/roles/kubernetes/preinstall/vars/debian-11.yml

Lines 1 to 7 in 6ca8ac2

	---
	required_pkgs:
	- python3-apt
	- gnupg
	- apt-transport-https
	- software-properties-common
	- conntrack

[floryut]

/ok-to-test
@rtsp agreed, I'll try to find time to add image and CI test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, rtsp

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• OWNERS [floryut]

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[champtar]

/lgtm