在k8s上搭建mysql单节点服务并实现客户端访问 |
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在k8s上搭建mysql单节点服务并实现客户端访问
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目的
基于k8s集群做mysql应用搭建练习。 以下实验可以基于我其他文档搭建的k8s集群来进行。 参考文档服务（Service） | Kubernetes 运行一个单实例有状态应用 | Kubernetes 检查集群状态 root@kmaster1:~# kubectl get nodes NAME STATUS ROLES AGE VERSION kmaster1 Ready control-plane 9d v1.28.0 kmaster2 Ready control-plane 9d v1.28.0 kmaster3 Ready control-plane 9d v1.28.0 knode1 Ready 9d v1.28.0 knode2 Ready 9d v1.28.0 knode3 Ready 9d v1.28.0 knode4 Ready 9d v1.28.0 准备配置文件 # 创建一个目录用来存放应用配置yaml，方便管理 mkdir /root/application/mysql cd /root/application/mysql # 创建配置yaml vim mysql-deployment.yaml apiVersion: v1 kind: PersistentVolume metadata: name: mysql-pv labels: type: local spec: storageClassName: manual capacity: storage: 20Gi accessModes: - ReadWriteOnce hostPath: path: "/mnt/single-data" --- apiVersion: v1 kind: PersistentVolumeClaim metadata: name: mysql-pvc spec: storageClassName: manual accessModes: - ReadWriteOnce resources: requests: storage: 20Gi --- apiVersion: v1 kind: Service metadata: name: mysql-service spec: type: NodePort selector: app: mysql ports: - port: 3306 targetPort: 3306 nodePort: 31313 --- apiVersion: apps/v1 kind: Deployment metadata: name: mysql spec: selector: matchLabels: app: mysql strategy: type: Recreate template: metadata: labels: app: mysql spec: containers: - image: mysql:5.7 name: mysql env: - name: MYSQL_ROOT_PASSWORD value: password ports: - containerPort: 3306 name: mysql volumeMounts: - name: mysql-persistent-storage mountPath: /var/lib/mysql volumes: - name: mysql-persistent-storage persistentVolumeClaim: claimName: mysql-pvc # yaml介绍 1、创建一个kind: PersistentVolume也就是pv，只要指定大小，挂载在节点的目录等等 2、创建一个kind: PersistentVolumeClaim也就是pvc，指定大小，绑定的pv名 storageClassName: manual 3、创建一个kind: Service将pod的mysql端口放到节点上，放到k8s集群外可以访问node:31313对应mysql:3306 4、创建deployment，启动mysql单节点服务 root@kmaster1:~/application/mysql# kubectl apply -f mysql-deployment.yaml persistentvolume/mysql-pv created persistentvolumeclaim/mysql-pvc created service/mysql-service created deployment.apps/mysql created root@kmaster1:~/application/mysql# kubectl get pv NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE mysql-pv 20Gi RWO Retain Bound default/mysql-pvc manual 16s root@kmaster1:~/application/mysql# kubectl get pvc NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE mysql-pvc Bound mysql-pv 20Gi RWO manual 22s root@kmaster1:~/application/mysql# kubectl get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.96.0.1 443/TCP 9d mysql-service NodePort 10.100.220.219 3306:31313/TCP 27s root@kmaster1:~/application/mysql# kubectl get svc -owide NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR kubernetes ClusterIP 10.96.0.1 443/TCP 9d mysql-service NodePort 10.100.220.219 3306:31313/TCP 35s app=mysql root@kmaster1:~/application/mysql# kubectl get pods NAME READY STATUS RESTARTS AGE mysql-6fbb5bdc8b-7lvx8 1/1 Running 0 39s root@kmaster1:~/application/mysql# kubectl get pods -owide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES mysql-6fbb5bdc8b-7lvx8 1/1 Running 0 48s 10.244.3.132 knode4 客户端连接测试
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