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apiVersion: apps/v1
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kind: StatefulSet
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metadata:
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name: fancy-dns
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namespace: dns
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labels:
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app.kubernetes.io/name: fancy-dns
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spec:
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serviceName: fancy-dns
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replicas: 2
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podManagementPolicy: Parallel
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selector:
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matchLabels:
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app.kubernetes.io/name: fancy-dns
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template:
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metadata:
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labels:
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app.kubernetes.io/name: fancy-dns
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annotations:
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# A config change is a SIGHUP, not a restart: the server re-reads the
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# file and hot-swaps every component.
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reloader.stakater.com/auto: "true"
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spec:
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# DNS on a non-privileged port needs NET_BIND_SERVICE on Linux, or
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# hostNetwork. hostNetwork is used here so the node's port 53 is served
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# directly and the load balancer does not add a hop.
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hostNetwork: true
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dnsPolicy: Default
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securityContext:
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runAsNonRoot: true
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runAsUser: 65532
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runAsGroup: 65532
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fsGroup: 65532
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seccompProfile:
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type: RuntimeDefault
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topologySpreadConstraints:
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- maxSkew: 1
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topologyKey: kubernetes.io/hostname
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whenUnsatisfiable: ScheduleAnyway
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labelSelector:
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matchLabels:
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app.kubernetes.io/name: fancy-dns
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containers:
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- name: fancy-dns
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image: fancydns/fancy-dns:latest
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imagePullPolicy: IfNotPresent
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args:
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- -config
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- /etc/fancy-dns/config.yaml
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ports:
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- name: dns-udp
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containerPort: 53
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protocol: UDP
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- name: dns-tcp
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containerPort: 53
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protocol: TCP
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- name: dot
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containerPort: 853
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protocol: TCP
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- name: doh
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containerPort: 443
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protocol: TCP
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- name: admin
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containerPort: 8080
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protocol: TCP
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securityContext:
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allowPrivilegeEscalation: false
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readOnlyRootFilesystem: true
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capabilities:
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drop: ["ALL"]
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# Liveness: the process is up. /api/healthz is unauthenticated on
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# purpose, because a probe cannot carry an API key.
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livenessProbe:
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httpGet:
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path: /api/healthz
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port: admin
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initialDelaySeconds: 5
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periodSeconds: 20
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# Readiness: the listener is actually bound, so the Service does not
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# send traffic to a pod that is still binding.
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readinessProbe:
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httpGet:
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path: /api/healthz
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port: admin
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initialDelaySeconds: 3
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periodSeconds: 5
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failureThreshold: 2
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# Startup: binding :53 and fetching the first blocklist can take a
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# while on a cold node, so give it room before the liveness probe
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# starts killing it.
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startupProbe:
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httpGet:
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path: /api/healthz
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port: admin
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periodSeconds: 3
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failureThreshold: 30
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resources:
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requests:
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cpu: 250m
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memory: 256Mi
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limits:
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# No CPU limit on purpose: a DNS server that gets throttled
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# turns into dropped queries, which is worse than a noisy
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# neighbour. The memory limit is the one that matters, because
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# the cache is sized in entries.
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memory: 1Gi
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volumeMounts:
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- name: config
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mountPath: /etc/fancy-dns/config.yaml
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subPath: config.yaml
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readOnly: true
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- name: zones
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mountPath: /etc/fancy-dns/zones
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readOnly: true
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- name: tls
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mountPath: /etc/fancy-dns/tls
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readOnly: true
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- name: data
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mountPath: /var/lib/fancy-dns
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- name: tmp
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mountPath: /tmp
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volumes:
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- name: config
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configMap:
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name: fancy-dns-config
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- name: zones
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configMap:
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name: fancy-dns-zones
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optional: true
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- name: tls
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secret:
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secretName: fancy-dns-tls
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- name: data
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emptyDir: {}
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- name: tmp
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emptyDir: {}
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: fancy-dns
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namespace: dns
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labels:
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app.kubernetes.io/name: fancy-dns
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spec:
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clusterIP: None
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selector:
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app.kubernetes.io/name: fancy-dns
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ports:
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- name: dns-udp
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port: 53
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targetPort: dns-udp
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protocol: UDP
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- name: dns-tcp
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port: 53
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targetPort: dns-tcp
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protocol: TCP
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- name: dot
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port: 853
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targetPort: dot
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- name: doh
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port: 443
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targetPort: doh
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- name: admin
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port: 8080
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targetPort: admin
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---
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# The admin console and the DoH endpoint share a port only if the ingress
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# terminates TLS; when it does, this routes /api and /dns-query to the same
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# backend. Kept separate from the Service above because a headless Service
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# cannot front an Ingress.
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apiVersion: networking.k8s.io/v1
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kind: Ingress
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metadata:
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name: fancy-dns
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namespace: dns
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annotations:
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nginx.ingress.kubernetes.io/backend-protocol: "HTTP"
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nginx.ingress.kubernetes.io/proxy-buffering: "off"
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nginx.ingress.kubernetes.io/proxy-read-timeout: "3600"
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spec:
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rules:
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- host: dns.example.com
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http:
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paths:
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- path: /api
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pathType: Prefix
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backend:
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service:
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name: fancy-dns
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port:
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name: admin
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- path: /dns-query
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pathType: Prefix
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backend:
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service:
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name: fancy-dns
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port:
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name: doh
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- path: /
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pathType: Prefix
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backend:
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service:
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name: fancy-dns
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port:
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name: admin
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tls:
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- hosts: [dns.example.com]
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secretName: fancy-dns-tls
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---
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apiVersion: policy/v1
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kind: PodDisruptionBudget
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metadata:
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name: fancy-dns
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namespace: dns
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spec:
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minAvailable: 1
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selector:
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matchLabels:
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app.kubernetes.io/name: fancy-dns
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---
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apiVersion: autoscaling/v2
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kind: HorizontalPodAutoscaler
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metadata:
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name: fancy-dns
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namespace: dns
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spec:
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scaleTargetRef:
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apiVersion: apps/v1
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kind: StatefulSet
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name: fancy-dns
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minReplicas: 2
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maxReplicas: 6
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metrics:
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- type: Resource
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resource:
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name: cpu
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target:
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type: Utilization
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averageUtilization: 70
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behavior:
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scaleDown:
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# A DNS server that flaps is worse than one that is briefly oversized:
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# every scale-down drops the local cache and the blocklist lease.
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stabilizationWindowSeconds: 600
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