Add support for Kata Containers (#6256)

* Install Kata Containers as additional container runtime

* Create RuntimeClasses for Kata Containers

* Updated Vagrant to optionally run without Docker as container manager

* Updated Vagrant to optionally use Libvirt nested virtualization

* Add Kata Containers documentation

* Fix lint errors

* Add kata_containers_enabled to kubespray-defaults

* Fixed typo error

* Fixed typo error

roles/kubernetes-apps/container_runtimes/kata_containers/defaults/main.yaml

@@ -0,0 +1,5 @@
+---
+
+kata_containers_qemu_overhead: true
+kata_containers_qemu_overhead_fixed_cpu: 10m
+kata_containers_qemu_overhead_fixed_memory: 290Mi

roles/kubernetes-apps/container_runtimes/kata_containers/tasks/main.yaml

@@ -0,0 +1,34 @@
+---
+
+- name: Kata Containers | Create addon dir
+  file:
+    path: "{{ kube_config_dir }}/addons/kata_containers"
+    owner: root
+    group: root
+    mode: 0755
+    recurse: true
+
+- name: Kata Containers | Templates list
+  set_fact:
+    kata_containers_templates:
+      - { name: runtimeclass-kata-qemu, file: runtimeclass-kata-qemu.yml, type: runtimeclass }
+
+- name: Kata Containers | Create manifests
+  template:
+    src: "{{ item.file }}.j2"
+    dest: "{{ kube_config_dir }}/addons/kata_containers/{{ item.file }}"
+  with_items: "{{ kata_containers_templates }}"
+  register: kata_containers_manifests
+  when:
+    - inventory_hostname == groups['kube-master'][0]
+
+- name: Kata Containers | Apply manifests
+  kube:
+    name: "{{ item.item.name }}"
+    kubectl: "{{ bin_dir }}/kubectl"
+    resource: "{{ item.item.type }}"
+    filename: "{{ kube_config_dir }}/addons/kata_containers/{{ item.item.file }}"
+    state: "latest"
+  with_items: "{{ kata_containers_manifests.results }}"
+  when:
+    - inventory_hostname == groups['kube-master'][0]

roles/kubernetes-apps/container_runtimes/kata_containers/templates/runtimeclass-kata-qemu.yml.j2

@@ -0,0 +1,12 @@
+---
+kind: RuntimeClass
+apiVersion: node.k8s.io/v1beta1
+metadata:
+  name: kata-qemu
+handler: kata-qemu
+{% if kata_containers_qemu_overhead %}
+overhead:
+  podFixed:
+    cpu: {{ kata_containers_qemu_overhead_fixed_cpu }}
+    memory: {{ kata_containers_qemu_overhead_fixed_memory }}
+{% endif %}

roles/kubernetes-apps/container_runtimes/meta/main.yml

@@ -0,0 +1,8 @@
+---
+dependencies:
+  - role: kubernetes-apps/container_runtimes/kata_containers
+    when: kata_containers_enabled
+    tags:
+      - apps
+      - kata-containers
+      - container-runtimes

roles/kubernetes-apps/meta/main.yml

@@ -77,6 +77,13 @@ dependencies:
       - apps
       - persistent_volumes
 
+  - role: kubernetes-apps/container_runtimes
+    when:
+      - inventory_hostname == groups['kube-master'][0]
+    tags:
+      - apps
+      - container-runtimes
+
   - role: kubernetes-apps/container_engine_accelerator
     when: nvidia_accelerator_enabled
     tags: