Adding pod priority for all the components. (#3361)

* Changes to assign pod priority to kube components.

* Removed the boolean flag pod_priority_assignment

* Created new priorityclass k8s-cluster-critical

* Created new priorityclass k8s-cluster-critical

* Fixed the trailing spaces

* Fixed the trailing spaces

* Added kube version check while creating Priority Class k8s-cluster-critical

* Moved k8s-cluster-critical.yml

* Moved k8s-cluster-critical.yml to kube_config_dir

roles/kubernetes-apps/cluster_roles/files/k8s-cluster-critical-pc.yml

@@ -0,0 +1,9 @@
+---
+
+apiVersion: scheduling.k8s.io/v1beta1
+kind: PriorityClass
+metadata:
+  name: k8s-cluster-critical
+value: 1000000000
+globalDefault: false
+description: "This priority class should only be used by the pods installed using kubespray."

roles/kubernetes-apps/cluster_roles/tasks/main.yml

@@ -174,3 +174,20 @@
   when:
     - cloud_provider is defined
     - cloud_provider == 'oci'
+
+- name: PriorityClass | Copy k8s-cluster-critical-pc.yml file
+  copy: src=k8s-cluster-critical-pc.yml dest={{ kube_config_dir }}/k8s-cluster-critical-pc.yml
+  when:
+    - kube_version|version_compare('v1.11.1', '>=')
+    - inventory_hostname == groups['kube-master'][0]
+
+- name: PriorityClass | Create k8s-cluster-critical
+  kube:
+    name: k8s-cluster-critical
+    kubectl: "{{bin_dir}}/kubectl"
+    resource: "PriorityClass"
+    filename: "{{ kube_config_dir }}/k8s-cluster-critical-pc.yml"
+    state: latest
+  when:
+    - kube_version|version_compare('v1.11.1', '>=')
+    - inventory_hostname == groups['kube-master'][0]