3e3ee0aeb1
* Add support for running a nodelocal dns cache
After encountering dns issues in a cluster I was recently working on I
noticed Kubernetes 1.13 introduced support for running a nodelocal dns
cache.
I believe this can usefull for more people.
73b548db06
https://github.com/kubernetes/enhancements/blob/master/keps/sig-network/0030-nodelocal-dns-cache.md
* Add requested changes
* Add additional requested changes + documentation
* Add requested changes after review
* Replace incorrect variable
72 lines
2 KiB
Django/Jinja
72 lines
2 KiB
Django/Jinja
apiVersion: apps/v1
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kind: DaemonSet
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metadata:
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name: nodelocaldns
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namespace: kube-system
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labels:
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k8s-app: kube-dns
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kubernetes.io/cluster-service: "true"
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addonmanager.kubernetes.io/mode: Reconcile
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spec:
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selector:
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matchLabels:
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k8s-app: nodelocaldns
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template:
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metadata:
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labels:
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k8s-app: nodelocaldns
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spec:
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{% if kube_version is version('v1.11.1', '>=') %}
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priorityClassName: system-cluster-critical
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{% endif %}
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serviceAccountName: nodelocaldns
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hostNetwork: true
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dnsPolicy: Default # Don't use cluster DNS.
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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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containers:
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- name: node-cache
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image: "{{ nodelocaldns_image_repo }}:{{ nodelocaldns_image_tag }}"
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resources:
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limits:
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memory: {{ nodelocaldns_memory_limit }}
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requests:
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cpu: {{ nodelocaldns_cpu_requests }}
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memory: {{ nodelocaldnsdns_memory_requests }}
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args: [ "-localip", "{{ nodelocaldns_ip }}", "-conf", "/etc/coredns/Corefile" ]
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securityContext:
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privileged: true
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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: 9253
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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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host: {{ nodelocaldns_ip }}
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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: 3
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volumeMounts:
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- name: config-volume
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mountPath: /etc/coredns
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volumes:
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- name: config-volume
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configMap:
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name: nodelocaldns
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items:
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- key: Corefile
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path: Corefile
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terminationGracePeriodSeconds: 30
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