add pdb

roles/kubernetes-apps/ansible/defaults/main.yml

@@ -16,8 +16,15 @@ coredns_ordinal_suffix: ""
 coredns_deployment_nodeselector: "kubernetes.io/os: linux"
 coredns_default_zone_cache_block: |
   cache 30
+
 coredns_host_network: false
 coredns_port: 53
+
+coredns_pod_disruption_budget: false
+
+# value for coredns pdb
+# coredns_max_unavailable: 1
+
 # coredns_additional_configs adds any extra configuration to coredns
 # coredns_additional_configs: |
 #   whoami

roles/kubernetes-apps/ansible/tasks/coredns.yml

@@ -42,3 +42,19 @@
     - inventory_hostname == groups['kube_control_plane'][0]
   tags:
     - coredns
+
+- name: Kubernetes Apps | Lay Down CoreDNS pdb
+  template:
+    src: "{{ item.file }}.j2"
+    dest: "{{ kube_config_dir }}/{{ item.file }}"
+    mode: 0644
+  loop:
+    - { name: coredns, file: coredns-poddisruptionbudget.yml, type: poddisruptionbudget }
+  register: coredns_optional_manifests
+  vars:
+    clusterIP: "{{ skydns_server }}"
+  when:
+    - coredns_pod_disruption_budget = true
+    - inventory_hostname == groups['kube_control_plane'][0]
+  tags:
+    - coredns

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

@@ -47,6 +47,7 @@
   with_items:
     - "{{ coredns_manifests.results | default({}) }}"
     - "{{ coredns_secondary_manifests.results | default({}) }}"
+    - "{{ coredns_optional_manifests | default({}) }}"
     - "{{ nodelocaldns_manifests.results | default({}) }}"
     - "{{ nodelocaldns_second_manifests.results | default({}) }}"
   when:

roles/kubernetes-apps/ansible/templates/coredns-poddisruptionbudget.yml.j2

@@ -0,0 +1,11 @@
+{%- if coredns_pod_disruption_budget -%}
+apiVersion: policy/v1
+kind: PodDisruptionBudget
+metadata:
+  name: coredns{{ coredns_ordinal_suffix }}
+spec:
+  maxUnavailable: {{ coredns_max_unavailable }}
+  selector:
+    matchLabels:
+      k8s-app: kube-dns{{ coredns_ordinal_suffix }}
+{% endif %}