* Docker/Containerd: move downloads urls to containerd-common

* gVisor: initial support for gVisor container runtime

$releasever can be 7Server, but there is no such CentOS path on
download.opensuse.org.

Use ansible_distribution_major_version instead of $releasever.

* Update docker package to 20.10.6

* Add Fedora 33 image and CI, remove Fedora 31 (EOL)

* Override the default value of containerd's root, state, and oom_score configurations

* Add tests data for containerd_storage_dir, containerd_state_dir and containerd_oom_score variables

* crio: add supported versions 1.20 and 1.21 and align default with k8s version

* cri-o: drop versions 1.17 and 1.18 from version matrix

* update note on cri-o version alignment

* Add nerdctl cli tool for containerd user

* Add nerdctl enable option

* Add nerdctl enable option and update nerdctl version to 0.8.0

* AlmaLinux: ansible>2.9.19 is needed to know about AlmaLinux

* AlmaLinux: identify as a centos derrivative

* AlmaLinux: add AlmaLinux to checks for CentOS

* Use ansible_os_family to compare family and not distribution

As the official document[1], the parameter keepcache should be
'0' or '1' as string. To avoid the following warning message,
this fixes the parameter value:

  [WARNING]: The value False (type bool) in a string field was
  converted to u'False' (type string). If this does not look
  like what you expect, quote the entire value to ensure it
  does not change.

https://docs.ansible.com/ansible/latest/collections/ansible/builtin/yum_repository_module.html

* Add containerd_extra_args

This is useful for custom containerd config, e.g. auth

Signed-off-by: Zhong Jianxin <azuwis@gmail.com>

* Make containerd config.toml mode 0640

It may contain sensitive information like password

Signed-off-by: Zhong Jianxin <azuwis@gmail.com>

* Set containerd version to 1.4.3

* Set containerd version to 1.4.4

Co-authored-by: Barry Melbourne <9964974+bmelbourne@users.noreply.github.com>

This replaces kube-master with kube_control_plane because of [1]:

  The Kubernetes project is moving away from wording that is
  considered offensive. A new working group WG Naming was created
  to track this work, and the word "master" was declared as offensive.
  A proposal was formalized for replacing the word "master" with
  "control plane". This means it should be removed from source code,
  documentation, and user-facing configuration from Kubernetes and
  its sub-projects.

NOTE: The reason why this changes it to kube_control_plane not
      kube-control-plane is for valid group names on ansible.

[1]: https://github.com/kubernetes/enhancements/blob/master/keps/sig-cluster-lifecycle/kubeadm/2067-rename-master-label-taint/README.md#motivation

* Add crun download_url and checksum

* Change versioning format to crun native versioning

* Download crun using download_file.yml

* Get crun version from download defaults

* Delegate crun binary copy task to crun role

* Added experimental cri-o support for Amazon Linux 2

* Fixed dependencies order

When privileged is enabled for a container, all the `/dev/*` block
devices from the host are mounted into the guest. The
`privileged_without_host_devices` flag prevents host devices from
being passed to privileged containers.

More information:
* https://github.com/containerd/cri/pull/1225
* https://github.com/cri-o/cri-o/commit/1d0f68156ba382651c776a44f156614c4fcf981d

Ubuntu 18.04 crio package ships with 'mountopt = "nodev,metacopy=on"'
even if GA kernel is 4.15 (HWE Kernel can be more recent)

Fedora package ships without metacopy=on

Signed-off-by: Etienne Champetier <e.champetier@ateme.com>

By default Ansible stat module compute checksum, list extended attributes and find mime type
To find all stat invocations that really use one of those:
git grep -F stat. | grep -vE 'stat.(islnk|exists|lnk_source|writeable)'

Signed-off-by: Etienne Champetier <e.champetier@ateme.com>

`containerd.io` is the companion package of `docker-ce` and is the
proper package name. This is needed to avoid apt upgrade/dist-upgrade
from breaking kubernetes.

This makes the docker role work the same as the containerd role.
Being able to override this is needed when you have your own debian
repository. E.g. when performing an airgapped installation