CoreDNS kubernetes 安装使用
2024-09-04 11:44:29
kubernetes 以前是skydns 后面变为 dnsmasq,coredns 也是一个不错的工具
1. 准备环境
安装 kubernetes
配置 kubelet 的cluster-dns
2. 下载coredns kubernetes 模板
地址:https://github.com/coredns/deployment/tree/master/kubernetes
3. 配置生成 coredns 配置信息
参考github 文档
./deploy.sh 10.3.0.0/24 | kubectl apply -f -
kubectl delete --namespace=kube-system deployment kube-dns
参考配置:
apiVersion: v1
kind: ConfigMap
metadata:
name: coredns
namespace: kube-system
data:
Corefile: |
.:53 {
errors
log stdout
health
kubernetes cluster.local 10.254.0.0/16
proxy . /etc/resolv.conf
cache 30
}
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: coredns
namespace: kube-system
labels:
k8s-app: coredns
kubernetes.io/cluster-service: "true"
kubernetes.io/name: "CoreDNS"
spec:
replicas: 1
selector:
matchLabels:
k8s-app: coredns
template:
metadata:
labels:
k8s-app: coredns
annotations:
scheduler.alpha.kubernetes.io/critical-pod: ''
scheduler.alpha.kubernetes.io/tolerations: '[{"key":"CriticalAddonsOnly", "operator":"Exists"}]'
spec:
containers:
- name: coredns
image: coredns/coredns:latest
imagePullPolicy: Always
args: [ "-conf", "/etc/coredns/Corefile" ]
volumeMounts:
- name: config-volume
mountPath: /etc/coredns
ports:
- containerPort: 53
name: dns
protocol: UDP
- containerPort: 53
name: dns-tcp
protocol: TCP
livenessProbe:
httpGet:
path: /health
port: 8080
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
dnsPolicy: Default
volumes:
- name: config-volume
configMap:
name: coredns
items:
- key: Corefile
path: Corefile
---
apiVersion: v1
kind: Service
metadata:
name: kube-dns
namespace: kube-system
labels:
k8s-app: coredns
kubernetes.io/cluster-service: "true"
kubernetes.io/name: "CoreDNS"
spec:
selector:
k8s-app: coredns
clusterIP: 10.254.0.3
ports:
- name: dns
port: 53
protocol: UDP
- name: dns-tcp
port: 53
protocol: TCP
4. 创建Deployment
kubectl apply -f dns.yaml
5. 总结
使用起来还是比较简单的,就一个容器镜像,同时扩展还是比较强大的
6. 测试
测试pod :
apiVersion: v1
kind: Pod
metadata:
name: busybox
namespace: default
spec:
containers:
- image: busybox
command:
- sleep
- "3600"
imagePullPolicy: IfNotPresent
name: busybox
restartPolicy: Always
测试命令 nslookup
测试命令 nslookup
7. 参考文档
https://github.com/coredns/deployment/tree/master/kubernetes
https://coredns.io/
https://coredns.io/2017/05/08/custom-dns-entries-for-kubernetes/
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