这个相对简单，直接修改yaml创建就可以
直接看文件
kubedns-cm.yaml
configap配置文件
# 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.
apiVersion: v1
kind: ConfigMap
metadata:
name: kube-dns
namespace: kube-system
labels:
addonmanager.kubernetes.io/mode: EnsureExists
kubedns-sa.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
name: kube-dns
namespace: kube-system
labels:
kubernetes.io/cluster-service: "true"
addonmanager.kubernetes.io/mode: Reconcile
kubedns-svc.yaml
# 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.
# __MACHINE_GENERATED_WARNING__
apiVersion: v1
kind: Service
metadata:
name: kube-dns
namespace: kube-system
labels:
k8s-app: kube-dns
kubernetes.io/cluster-service: "true"
addonmanager.kubernetes.io/mode: Reconcile
kubernetes.io/name: "KubeDNS"
spec:
selector:
k8s-app: kube-dns
clusterIP: 10.254.0.3
ports:
- name: dns
port: 53
protocol: UDP
- name: dns-tcp
port: 53
这个里面注意clusterIP和kubelet里面配置的保存一致即可
kubedns-controller.yaml
# 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.
# Should keep target in cluster/addons/dns-horizontal-autoscaler/dns-horizontal-autoscaler.yaml
# in sync with this file.
# __MACHINE_GENERATED_WARNING__
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: kube-dns
namespace: kube-system
labels:
k8s-app: kube-dns
kubernetes.io/cluster-service: "true"
addonmanager.kubernetes.io/mode: Reconcile
spec:
# replicas: not specified here:
# 1. In order to make Addon Manager do not reconcile this replicas parameter.
# 2. Default is 1.
# 3. Will be tuned in real time if DNS horizontal auto-scaling is turned on.
strategy:
rollingUpdate:
maxSurge: 10%
maxUnavailable: 0
selector:
matchLabels:
k8s-app: kube-dns
template:
metadata:
labels:
k8s-app: kube-dns
annotations:
scheduler.alpha.kubernetes.io/critical-pod: ''
spec:
tolerations:
-key: "CriticalAddonsOnly" operator: "Exists"
volumes:
-name: configMap:
name: kube-dns
optional: true
containers:
-name: image: gcr.io/google_containers/k8s-dns-kube-dns-amd64:1.14.1
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: 170Mi
requests:
cpu: 100m
memory: 70Mi
livenessProbe:
httpGet:
path: /healthcheck/kubedns
port: 10054
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: 3
timeoutSeconds: 5
args:
- --domain=cluster.local.
-10053 -/kube-dns-config
-2 env:
-name: PROMETHEUS_PORT value: "10055"
ports:
-containerPort: 10053 name: dns-local
protocol: UDP
-containerPort: 10053 name: dns-tcp-local
protocol: TCP
-containerPort: 10055 name: metrics
protocol: TCP
volumeMounts:
-name: mountPath: /kube-dns-config
-name: image: gcr.io/google_containers/k8s-dns-dnsmasq-nanny-amd64:1.14.1
livenessProbe:
httpGet:
path: /healthcheck/dnsmasq
port: 10054
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
args:
-2 - -logtostderr
-/etc/k8s/dns/dnsmasq-nanny
-true - --
- -k
-1000 - --log-facility=-
-/cluster.local./127.0.0.1#10053 -/in-addr.arpa/127.0.0.1#10053 -/ip6.arpa/127.0.0.1#10053 ports:
-containerPort: 53 name: dns
protocol: UDP
-containerPort: 53 name: dns-tcp
protocol: TCP
# see: https://github.com/kubernetes/kubernetes/issues/29055 for details
resources:
requests:
cpu: 150m
memory: 20Mi
volumeMounts:
-name: mountPath: /etc/k8s/dns/dnsmasq-nanny
-name: image: gcr.io/google_containers/k8s-dns-sidecar-amd64:1.14.1
livenessProbe:
httpGet:
path: /metrics
port: 10054
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
args:
-2 - --logtostderr
-127.0.0.1:10053,kubernetes.default.svc.cluster.local.,5,A -127.0.0.1:53,kubernetes.default.svc.cluster.local.,5,A ports:
-containerPort: 10054
然后通过kubectl逐一创建就行，也可以放到一个目录下面，kubectl create -f .批量创建。
kubectl create -f kubedns-cm.yaml
kubectl create -f kubedns-sa.yaml
kubectl create -f kubedns-svc.yaml
kubectl create -f kubedns-controller.yaml
验证
起一个pod通过dns验证
apiVersion: v1
kind: Pod
metadata:
name: busybox
namespace: default
spec:
containers:
-image: command:
- sleep
-"3600"
exec到容器内，验证
nslookup kubernetes
Server: 10.254.0.3
Address 1: 10.254.0.3 kube-dns.kube-system.svc.cluster.local
Name: kubernetes
Address 1: 10.254.0.1 kubernetes.default.svc.cluster.local
ok能偶解析kubernetes。关于dns源码解析请看我之前的blog。
