kubespray/roles/kubernetes-apps/ansible/templates/coredns-deployment.yml.j2

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---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: coredns{{ coredns_ordinal_suffix | default('') }}
namespace: kube-system
labels:
k8s-app: coredns{{ coredns_ordinal_suffix | default('') }}
kubernetes.io/cluster-service: "true"
addonmanager.kubernetes.io/mode: Reconcile
kubernetes.io/name: "CoreDNS"
spec:
replicas: {{ coredns_replicas }}
strategy:
type: RollingUpdate
rollingUpdate:
maxUnavailable: 0
maxSurge: 10%
selector:
matchLabels:
k8s-app: coredns{{ coredns_ordinal_suffix | default('') }}
template:
metadata:
labels:
k8s-app: coredns{{ coredns_ordinal_suffix | default('') }}
annotations:
scheduler.alpha.kubernetes.io/critical-pod: ''
spec:
serviceAccountName: coredns
tolerations:
- key: node-role.kubernetes.io/master
effect: NoSchedule
- key: "CriticalAddonsOnly"
operator: "Exists"
affinity:
podAntiAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
- topologyKey: "kubernetes.io/hostname"
labelSelector:
matchLabels:
k8s-app: coredns{{ coredns_ordinal_suffix | default('') }}
nodeAffinity:
preferredDuringSchedulingIgnoredDuringExecution:
- weight: 100
preference:
matchExpressions:
- key: node-role.kubernetes.io/master
operator: In
values:
- "true"
containers:
- name: coredns
image: "{{ coredns_image_repo }}:{{ coredns_image_tag }}"
imagePullPolicy: {{ k8s_image_pull_policy }}
resources:
# TODO: Set memory limits when we've profiled the container for large
# clusters, then set request = limit to keep this container in
# guaranteed class. Currently, this container falls into the
# "burstable" category so the kubelet doesn't backoff from restarting it.
limits:
memory: {{ dns_memory_limit }}
requests:
cpu: {{ dns_cpu_requests }}
memory: {{ dns_memory_requests }}
args: [ "-conf", "/etc/coredns/Corefile" ]
volumeMounts:
- name: config-volume
mountPath: /etc/coredns
ports:
- containerPort: 53
name: dns
protocol: UDP
- containerPort: 53
name: dns-tcp
protocol: TCP
- containerPort: 9153
name: metrics
protocol: TCP
livenessProbe:
httpGet:
path: /health
port: 8080
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
dnsPolicy: Default
volumes:
- name: config-volume
configMap:
name: coredns
items:
- key: Corefile
path: Corefile