备案时网站名称可以重复吗,天津小型网站建设,中国成熟iphone,2345网址导航设为主页一、概念 coreDNS组件#xff1a;就是将svc资源的名称解析成ClusterIP#xff1b; kubeadm部署的k8s集群自带coreDNS组件#xff0c;二进制部署需要自己手动部署#xff1b; [rootk8s231 ~]# kubectl get pods -o wide -A k8s系统中安装了coreDNS组件后#xff0c;会有一个…一、概念 coreDNS组件就是将svc资源的名称解析成ClusterIP kubeadm部署的k8s集群自带coreDNS组件二进制部署需要自己手动部署 [rootk8s231 ~]# kubectl get pods -o wide -A k8s系统中安装了coreDNS组件后会有一个coreDNS开头的pod资源 二、查看k8s集群的coreDNS的IP地址 查看kubelet的配置文件中可以看到集群dns的地址 [rootk8s231 ~]# vim /var/lib/kubelet/config.yaml ............ clusterDNS: - 10.200.0.10 clusterDomain: xinjizhiwa.com ............... [rootk8s231 ~]# kubectl get svc -A 查看k8s集群中DNS的svc的详细信息可以看到里面解析了coreDNS的地址在endpoint列表中 [rootk8s231 ~]# kubectl describe -n kube-system svc kube-dns 三、测试coreDNS组件是否正常
1第一种方式验证
· 准备wordpress的案例的资源文件 [rootk8s231 dns]# ll total 12 -rw-r--r-- 1 root root 574 Feb 17 22:47 db.yaml -rw-r--r-- 1 root root 599 Feb 17 22:51 deploy.yaml -rw-r--r-- 1 root root 411 Feb 17 22:50 svc.yaml [rootk8s231 dns]# cat deploy.yaml apiVersion: apps/v1 kind: Deployment metadata: name: dm-wordpress spec: replicas: 1 selector: matchLabels: k8s: k8s template: metadata: labels: k8s: k8s spec: containers: - name: wp-c image: wordpress:latest ports: - name: wp-port containerPort: 80 env: - name: WORDPRESS_DB_HOST value: 10.200.22.22:3306 - name: WORDPRESS_DB_USER value: wordpress - name: WORDPRESS_DB_PASSWORD value: wordpress - name: WORDPRESS_DB_NAME value: wordpress [rootk8s231 dns]# cat db.yaml apiVersion: apps/v1 kind: Deployment metadata: name: wordpress-db spec: replicas: 1 selector: matchLabels: k8s: db template: metadata: labels: k8s: db spec: containers: - name: db-c image: mysql:8.0 ports: - name: db-port containerPort: 3306 env: - name: MYSQL_DATABASE value: wordpress - name: MYSQL_USER value: wordpress - name: MYSQL_PASSWORD value: wordpress - name: MYSQL_ROOT_PASSWORD value: wordpress [rootk8s231 dns]# cat svc.yaml apiVersion: v1 kind: Service metadata: name: svc-db spec: type: NodePort clusterIP: 10.200.22.22 selector: k8s: db ports: - protocol: TCP port: 3306 targetPort: 3306 nodePort: 30001 --- apiVersion: v1 kind: Service metadata: name: svc-wp spec: type: NodePort selector: k8s: k8s ports: - protocol: TCP port: 80 targetPort: 80 nodePort: 30000 · 查看现有的svc · 响应式创建一个pod容器 [rootk8s231 ~]# kubectl run xinjizhiwa-dns --rm -it --imagealpine:latest -- sh / # ping svc-wp PING svc-wp (10.200.20.12): 56 data bytes 2第二种方式验证
· dig一个svc名称
[rootk8s231 ~]# yum -y install bind-utils [rootk8s231 ~]# dig 10.200.0.10 svc-wp.default.svc.xinjizhiwa.com short 10.200.20.12 四、使用coreDNS
1将wordpress指向数据库svc的IP换成名称 [rootk8s231 dns]# vim deploy.yaml [rootk8s231 dns]# kubectl apply -f deploy.yaml 2浏览器访问查看 至此coreDNS学习完毕
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