e3dcd96301
* kubedns & kubedns-autoscaler: Stick to master nodes.
- Tolerate only master nodes and not any NoSchedule taint
- Pods are on different nodes
- Pods are required to be on a master node.
* kubedns: use soft nodeAffinity.
Prefer to be on a master node, don't require.
* coredns: Stick to (different) master nodes.
- Pods are on different nodes
- Pods are preferred to be on a master node.
97 lines
3 KiB
Django/Jinja
97 lines
3 KiB
Django/Jinja
---
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apiVersion: extensions/v1beta1
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kind: Deployment
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metadata:
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name: coredns{{ coredns_ordinal_suffix | default('') }}
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namespace: kube-system
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labels:
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k8s-app: coredns{{ coredns_ordinal_suffix | default('') }}
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kubernetes.io/cluster-service: "true"
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addonmanager.kubernetes.io/mode: Reconcile
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kubernetes.io/name: "CoreDNS"
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spec:
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replicas: {{ coredns_replicas }}
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strategy:
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type: RollingUpdate
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rollingUpdate:
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maxUnavailable: 0
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maxSurge: 10%
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selector:
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matchLabels:
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k8s-app: coredns{{ coredns_ordinal_suffix | default('') }}
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template:
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metadata:
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labels:
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k8s-app: coredns{{ coredns_ordinal_suffix | default('') }}
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annotations:
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scheduler.alpha.kubernetes.io/critical-pod: ''
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spec:
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{% if rbac_enabled %}
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serviceAccountName: coredns
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{% endif %}
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tolerations:
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- key: node-role.kubernetes.io/master
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effect: NoSchedule
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- key: "CriticalAddonsOnly"
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operator: "Exists"
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affinity:
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podAntiAffinity:
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requiredDuringSchedulingIgnoredDuringExecution:
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- topologyKey: "kubernetes.io/hostname"
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labelSelector:
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matchLabels:
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k8s-app: coredns{{ coredns_ordinal_suffix | default('') }}
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nodeAffinity:
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preferredDuringSchedulingIgnoredDuringExecution:
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- weight: 100
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preference:
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matchExpressions:
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- key: node-role.kubernetes.io/master
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operator: In
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values:
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- "true"
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containers:
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- name: coredns
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image: "{{ coredns_image_repo }}:{{ coredns_image_tag }}"
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imagePullPolicy: {{ k8s_image_pull_policy }}
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resources:
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# TODO: Set memory limits when we've profiled the container for large
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# clusters, then set request = limit to keep this container in
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# guaranteed class. Currently, this container falls into the
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# "burstable" category so the kubelet doesn't backoff from restarting it.
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limits:
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memory: {{ dns_memory_limit }}
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requests:
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cpu: {{ dns_cpu_requests }}
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memory: {{ dns_memory_requests }}
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args: [ "-conf", "/etc/coredns/Corefile" ]
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volumeMounts:
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- name: config-volume
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mountPath: /etc/coredns
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ports:
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- containerPort: 53
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name: dns
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protocol: UDP
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- containerPort: 53
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name: dns-tcp
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protocol: TCP
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- containerPort: 9153
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name: metrics
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protocol: TCP
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livenessProbe:
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httpGet:
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path: /health
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port: 8080
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scheme: HTTP
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initialDelaySeconds: 60
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timeoutSeconds: 5
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successThreshold: 1
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failureThreshold: 5
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dnsPolicy: Default
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volumes:
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- name: config-volume
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configMap:
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name: coredns
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items:
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- key: Corefile
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path: Corefile
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