kubernetes-the-hard-way/deployments/kubedns.yaml

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# Copyright 2016 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
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apiVersion: extensions/v1beta1
kind: Deployment
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metadata:
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name: kube-dns-v19
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namespace: kube-system
labels:
k8s-app: kube-dns
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version: v19
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kubernetes.io/cluster-service: "true"
spec:
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replicas: 2
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selector:
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matchLabels:
k8s-app: kube-dns
version: v19
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template:
metadata:
labels:
k8s-app: kube-dns
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version: v19
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kubernetes.io/cluster-service: "true"
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annotations:
scheduler.alpha.kubernetes.io/critical-pod: ''
scheduler.alpha.kubernetes.io/tolerations: '[{"key":"CriticalAddonsOnly", "operator":"Exists"}]'
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spec:
containers:
- name: kubedns
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image: gcr.io/google_containers/kubedns-amd64:1.7
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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:
cpu: 100m
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memory: 170Mi
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requests:
cpu: 100m
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memory: 70Mi
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livenessProbe:
httpGet:
path: /healthz
port: 8080
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
readinessProbe:
httpGet:
path: /readiness
port: 8081
scheme: HTTP
# we poll on pod startup for the Kubernetes master service and
# only setup the /readiness HTTP server once that's available.
initialDelaySeconds: 30
timeoutSeconds: 5
args:
# command = "/kube-dns"
- --domain=cluster.local
- --dns-port=10053
ports:
- containerPort: 10053
name: dns-local
protocol: UDP
- containerPort: 10053
name: dns-tcp-local
protocol: TCP
- name: dnsmasq
image: gcr.io/google_containers/kube-dnsmasq-amd64:1.3
args:
- --cache-size=1000
- --no-resolv
- --server=127.0.0.1#10053
ports:
- containerPort: 53
name: dns
protocol: UDP
- containerPort: 53
name: dns-tcp
protocol: TCP
- name: healthz
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image: gcr.io/google_containers/exechealthz-amd64:1.1
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resources:
# keep request = limit to keep this container in guaranteed class
limits:
cpu: 10m
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memory: 50Mi
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requests:
cpu: 10m
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memory: 50Mi
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args:
- -cmd=nslookup kubernetes.default.svc.cluster.local 127.0.0.1 >/dev/null && nslookup kubernetes.default.svc.cluster.local 127.0.0.1:10053 >/dev/null
- -port=8080
- -quiet
ports:
- containerPort: 8080
protocol: TCP
dnsPolicy: Default # Don't use cluster DNS.