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Add PodDisruptionBudget for CoreDNS deployment. Allows users to control disruption behavior and set maximum unavailable pods (#10557)

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lobiyed.karim
2024-01-16 10:04:47 +01:00
committed by GitHub
parent beb2660aa8
commit 7b7c9f509e
3 changed files with 18 additions and 0 deletions
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5
roles/kubernetes-apps/ansible/defaults/main.yml
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@@ -18,6 +18,11 @@ coredns_default_zone_cache_block: |
cache 30 cache 30
coredns_host_network: false coredns_host_network: false
coredns_port: 53 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 adds any extra configuration to coredns
# coredns_additional_configs: | # coredns_additional_configs: |
# whoami # whoami

4
roles/kubernetes-apps/ansible/tasks/coredns.yml
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@@ -14,6 +14,7 @@
- { name: dns-autoscaler, file: dns-autoscaler.yml, type: deployment } - { 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-clusterrole.yml, type: clusterrole }
- { name: dns-autoscaler, file: dns-autoscaler-clusterrolebinding.yml, type: clusterrolebinding } - { 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 } - { name: dns-autoscaler, file: dns-autoscaler-sa.yml, type: sa }
register: coredns_manifests register: coredns_manifests
vars: vars:
@@ -22,6 +23,7 @@
- dns_mode in ['coredns', 'coredns_dual'] - dns_mode in ['coredns', 'coredns_dual']
- inventory_hostname == groups['kube_control_plane'][0] - inventory_hostname == groups['kube_control_plane'][0]
- enable_dns_autoscaler or item.name != 'dns-autoscaler' - enable_dns_autoscaler or item.name != 'dns-autoscaler'
- item.condition | default(True)
tags: tags:
- coredns - coredns
@@ -34,6 +36,7 @@
- { name: coredns, src: coredns-deployment.yml, file: coredns-deployment-secondary.yml, type: deployment } - { 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: 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: 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 register: coredns_secondary_manifests
vars: vars:
clusterIP: "{{ skydns_server_secondary }}" clusterIP: "{{ skydns_server_secondary }}"
@@ -42,5 +45,6 @@
- dns_mode == 'coredns_dual' - dns_mode == 'coredns_dual'
- inventory_hostname == groups['kube_control_plane'][0] - inventory_hostname == groups['kube_control_plane'][0]
- enable_dns_autoscaler or item.name != 'dns-autoscaler' - enable_dns_autoscaler or item.name != 'dns-autoscaler'
- item.condition | default(True)
tags: tags:
- coredns - coredns

9
roles/kubernetes-apps/ansible/templates/coredns-poddisruptionbudget.yml.j2 Normal file
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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 }}