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add pdb to coredns #10557

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Jan 16, 2024
Merged

add pdb to coredns #10557

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5 changes: 5 additions & 0 deletions roles/kubernetes-apps/ansible/defaults/main.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,11 @@ coredns_default_zone_cache_block: |
cache 30
coredns_host_network: false
coredns_port: 53

coredns_pod_disruption_budget: false
# value for coredns pdb
coredns_pod_disruption_budget_max_unavailable: "30%"

# coredns_additional_configs adds any extra configuration to coredns
# coredns_additional_configs: |
# whoami
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4 changes: 4 additions & 0 deletions roles/kubernetes-apps/ansible/tasks/coredns.yml
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Expand Up @@ -14,6 +14,7 @@
- { name: dns-autoscaler, file: dns-autoscaler.yml, type: deployment }
- { name: dns-autoscaler, file: dns-autoscaler-clusterrole.yml, type: clusterrole }
- { name: dns-autoscaler, file: dns-autoscaler-clusterrolebinding.yml, type: clusterrolebinding }
- { name: coredns, file: coredns-poddisruptionbudget.yml, type: poddisruptionbudget, condition: coredns_pod_disruption_budget }
- { name: dns-autoscaler, file: dns-autoscaler-sa.yml, type: sa }
register: coredns_manifests
vars:
Expand All @@ -22,6 +23,7 @@
- dns_mode in ['coredns', 'coredns_dual']
- inventory_hostname == groups['kube_control_plane'][0]
- enable_dns_autoscaler or item.name != 'dns-autoscaler'
- item.condition | default(True)
tags:
- coredns

Expand All @@ -34,6 +36,7 @@
- { name: coredns, src: coredns-deployment.yml, file: coredns-deployment-secondary.yml, type: deployment }
- { name: coredns, src: coredns-svc.yml, file: coredns-svc-secondary.yml, type: svc }
- { name: dns-autoscaler, src: dns-autoscaler.yml, file: coredns-autoscaler-secondary.yml, type: deployment }
- { name: coredns, file: coredns-poddisruptionbudget.yml, type: poddisruptionbudget, condition: coredns_pod_disruption_budget }
register: coredns_secondary_manifests
vars:
clusterIP: "{{ skydns_server_secondary }}"
Expand All @@ -42,5 +45,6 @@
- dns_mode == 'coredns_dual'
- inventory_hostname == groups['kube_control_plane'][0]
- enable_dns_autoscaler or item.name != 'dns-autoscaler'
- item.condition | default(True)
tags:
- coredns
9 changes: 9 additions & 0 deletions roles/kubernetes-apps/ansible/templates/coredns-poddisruptionbudget.yml.j2
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@@ -0,0 +1,9 @@
apiVersion: policy/v1
kind: PodDisruptionBudget
metadata:
name: coredns{{ coredns_ordinal_suffix }}
spec:
maxUnavailable: {{ coredns_pod_disruption_budget_max_unavailable }}
selector:
matchLabels:
k8s-app: kube-dns{{ coredns_ordinal_suffix }}