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前面搭建好了 Kubernetes 集群与私有镜像仓库#xff0c;终于要进入服务编排的实践环节了。本系列拿 ruoyi-cloud 项目进行练手#xff0c;按照 MySQL #xff0c; Nacos #xff0c; Redis #xff0c; Nginx #xff0c; Gateway #xff0c; Auth #xff0c;…背景
前面搭建好了 Kubernetes 集群与私有镜像仓库终于要进入服务编排的实践环节了。本系列拿 ruoyi-cloud 项目进行练手按照 MySQL Nacos Redis Nginx Gateway Auth System 的顺序来部署 ruoyi-cloud 微服务应用。
部署一个服务前需要明确它是有状态服务还是无状态服务这里 MySQL Nacos Redis Nginx 当做有状态服务StatefulSet来部署而 Gateway Auth System 这些微服务作为无状态服务Deployment来部署。
这一次对全部服务采用 YAML 文件的方式来进行部署这有助于理解K8S组织管理资源的风格后续我们可以借助开源的容器平台eg KubeSphere 来进行可视化的服务部署。不过手动编写 YAML 文件有一个问题那就是当面对较多的微服务时工作量较大基本成了体力活有个好消息是我们可以使用 Kubernetes 官方提供的 kompose 工具实现对 dokcer-compose 的 yaml 到 K8S 的 yaml 的转换。
另外为了保证后续在实际生产环境下各组件的稳定与可靠我们限定了所有基础镜像的版本。
MySQL: 8.0Nacos: 2.2.3Redis: 7.2.3Nginx: 1.25.3
虚机资源
共用到了三台虚机1台作为 Master 节点2台 Worker 节点。
主机名IP说明k8s-master172.16.201.25主节点k8s-node1172.16.201.26工作节点k8s-node2172.16.201.27工作节点
[rootk8s-master ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master Ready control-plane,master 37h v1.20.9
k8s-node1 Ready none 35h v1.20.9
k8s-node2 Ready none 35h v1.20.9系统环境
[rootk8s-master ~]# uname -a
Linux k8s-master 3.10.0-1160.71.1.el7.x86_64 #1 SMP Tue Jun 28 15:37:28 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
[rootk8s-master ~]# cat /proc/version
Linux version 3.10.0-1160.71.1.el7.x86_64 (mockbuildkbuilder.bsys.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC) ) #1 SMP Tue Jun 28 15:37:28 UTC 2022
[rootk8s-master ~]# cat /etc/redhat-release
CentOS Linux release 7.9.2009 (Core)YAML转换
ruoyi-cloud 项目本身提供了一个使用 docker-compose 部署的配置文件以及所有依赖服务镜像的构建脚本是在项目根目录的 docker 目录下可参考Docker容器化部署若依微服务ruoyi-cloud项目。
先将这个 docker 目录上传到 Kubernetes 的主节点然后使用 kompose 将 dokcer-compose 的 yaml 转换为 K8S 的 yaml 。
curl -L https://github.com/kubernetes/kompose/releases/download/v1.26.0/kompose-linux-amd64 -o kompose
chmod x kompose
mv ./kompose /usr/local/bin/kompose
[rootk8s-master docker]# cd /opt/docker
[rootk8s-master docker]# kompose convert对于自动转换后的 YAML 我们做简单的修改后即可应用部署。下面是 MySQL 的 YAML 配置文件做了合并和微调。
ruoyi-mysql-ns-sc-pv-pvc.yaml
apiVersion: v1
kind: Namespace
metadata:name: ruoyi-basic---apiVersion: v1
kind: PersistentVolume
metadata:name: ruoyi-mysql-data-pvlabels:pv: ruoyi-mysql-data-pv
spec:capacity: storage: 5GiaccessModes:- ReadWriteOncepersistentVolumeReclaimPolicy: RetainstorageClassName: local-storagelocal:path: /data/mysql/datanodeAffinity:required:nodeSelectorTerms:- matchExpressions:- key: kubernetes.io/hostnameoperator: Invalues:- k8s-node1---apiVersion: v1
kind: PersistentVolume
metadata:name: ruoyi-mysql-log-pvlabels:pv: ruoyi-mysql-log-pv
spec:capacity: storage: 5GiaccessModes:- ReadWriteOncepersistentVolumeReclaimPolicy: RetainstorageClassName: local-storagelocal:path: /data/mysql/lognodeAffinity:required:nodeSelectorTerms:- matchExpressions:- key: kubernetes.io/hostnameoperator: Invalues:- k8s-node1
---apiVersion: v1
kind: PersistentVolumeClaim
metadata:name: ruoyi-mysql-data-pvcnamespace: ruoyi-basic
spec:accessModes:- ReadWriteOnceresources:requests:storage: 10MistorageClassName: local-storageselector:matchLabels:pv: ruoyi-mysql-data-pv
---apiVersion: v1
kind: PersistentVolumeClaim
metadata:name: ruoyi-mysql-log-pvcnamespace: ruoyi-basic
spec:accessModes:- ReadWriteOnceresources:requests:storage: 2GistorageClassName: local-storageselector:matchLabels:pv: ruoyi-mysql-log-pv---apiVersion: v1
kind: ConfigMap
metadata:name: ruoyi-mysql-configmapnamespace: ruoyi-basic
data:my-custom.cnf: |[mysqld]# handle error this is incompatible with sql_modeonly_full_group_bysql_modeSTRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTIONsocket/var/run/mysqld/mysqld.sock[client]socket/var/run/mysqld/mysqld.sockNote: 这里使用 local-storage 的 StorageClass 并使用本地磁盘的方式创建使用 PV 实际建议使用 NFS 。
ruoyi-mysql-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:annotations:kompose.cmd: kompose convertkompose.version: 1.26.0 (40646f47)labels:io.kompose.service: ruoyi-mysqlname: ruoyi-mysqlnamespace: ruoyi-basic
spec:replicas: 1selector:matchLabels:io.kompose.service: ruoyi-mysqltemplate:metadata:annotations:kompose.cmd: kompose convertkompose.version: 1.26.0 (40646f47)labels:io.kompose.service: ruoyi-mysqlspec:containers:- args:- --innodb-buffer-pool-size80M- --character-set-serverutf8mb4- --collation-serverutf8mb4_unicode_ci- --default-time-zone8:00- --lower-case-table-names1env:- name: MYSQL_DATABASEvalue: ruoyi-cloud- name: MYSQL_ROOT_PASSWORDvalue: you-guessimage: mysql:8.0name: ruoyi-mysqlports:- containerPort: 3306volumeMounts:- mountPath: /var/lib/mysqlname: ruoyi-mysql-data-pvc- mountPath: /var/log/mysqlname: ruoyi-mysql-log-pvc- mountPath: /etc/mysql/conf.dname: ruoyi-mysql-configrestartPolicy: Alwaysvolumes:- name: ruoyi-mysql-data-pvcpersistentVolumeClaim:claimName: ruoyi-mysql-data-pvc- name: ruoyi-mysql-log-pvcpersistentVolumeClaim:claimName: ruoyi-mysql-log-pvc- name: ruoyi-mysql-configconfigMap:name: ruoyi-mysql-configmapruoyi-mysql-service.yaml
apiVersion: v1
kind: Service
metadata:annotations:kompose.cmd: kompose convertkompose.version: 1.26.0 (40646f47)labels:io.kompose.service: ruoyi-mysqlname: ruoyi-mysqlnamespace: ruoyi-basic
spec:ports:- name: 3306port: 3306targetPort: 3306nodePort: 30306selector:io.kompose.service: ruoyi-mysqltype: NodePort部署MySQL
Note: 本次部署 MySQL 时用了 Deployment 运行的pod名称会有个随机后缀实际生产建议使用 StatefulSet pod名称后缀为0更合适。
# 创建NameSpace、StorageClass、PV、PVC
[rootk8s-master mysql]# kubectl apply -f ruoyi-mysql-ns-sc-pv-pvc.yaml
namespace/ruoyi-basic created
persistentvolume/ruoyi-mysql-data-pv created
persistentvolume/ruoyi-mysql-log-pv created
persistentvolumeclaim/ruoyi-mysql-data-pvc created
persistentvolumeclaim/ruoyi-mysql-log-pvc created
configmap/ruoyi-mysql-configmap created# 部署MySQL
[rootk8s-master mysql]# kubectl apply -f ruoyi-mysql-deployment.yaml
deployment.apps/ruoyi-mysql created# 创建MySQL服务
[rootk8s-master mysql]# kubectl apply -f ruoyi-mysql-service.yaml
service/ruoyi-mysql created# 查看PV信息
[rootk8s-master mysql]# kubectl get pv -owide
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE VOLUMEMODE
docker-registry-pv 5Gi RWX Retain Bound docker-registry/docker-registry-pvc local-storage 26h Filesystem
ruoyi-mysql-data-pv 5Gi RWX Retain Bound ruoyi-basic/ruoyi-mysql-data-pvc local-storage 5m16s Filesystem
ruoyi-mysql-log-pv 5Gi RWX Retain Bound ruoyi-basic/ruoyi-mysql-log-pvc local-storage 5m16s Filesystem# 获取配置信息
[rootk8s-master mysql]# kubectl get cm -n ruoyi-basic
NAME DATA AGE
kube-root-ca.crt 1 17m
ruoyi-mysql-configmap 1 17m# 可通过以下命令查看编辑MySQL的配置
[rootk8s-master ~]# kubectl edit cm ruoyi-mysql-configmap -n ruoyi-basic# 查看MySQL日志
[rootk8s-master ~]# kubectl logs ruoyi-mysql-8c779d94c-b7r9n -n ruoyi-basic# 查看所有PodMySQL就绪
[rootk8s-master mysql]# kubectl get pod -A
NAMESPACE NAME READY STATUS RESTARTS AGE
docker-registry docker-registry-9bc898786-l477q 1/1 Running 1 17h
kube-system calico-kube-controllers-577f77cb5c-hv29w 1/1 Running 2 3d22h
kube-system calico-node-4fkrs 1/1 Running 0 3d22h
kube-system calico-node-d4tqq 1/1 Running 2 3d22h
kube-system calico-node-sdmm6 1/1 Running 4 3d22h
kube-system etcd-k8s-master 1/1 Running 9 5d9h
kube-system kube-apiserver-k8s-master 1/1 Running 9 5d9h
kube-system kube-controller-manager-k8s-master 1/1 Running 9 5d9h
kube-system kube-proxy-4789z 1/1 Running 0 5d9h
kube-system kube-proxy-7mt7k 1/1 Running 5 5d9h
kube-system kube-proxy-lqtpz 1/1 Running 2 5d9h
kube-system kube-scheduler-k8s-master 1/1 Running 10 5d9h
kubernetes-dashboard dashboard-metrics-scraper-79c5968bdc-j9bnv 1/1 Running 0 3d22h
kubernetes-dashboard kubernetes-dashboard-658485d5c7-pq7z8 1/1 Running 0 3d22h
ruoyi-basic ruoyi-mysql-8c779d94c-b7r9n 1/1 Running 0 4m3s# MySQL对外暴露了端口用于测试
[rootk8s-master mysql]# kubectl get svc -n ruoyi-basic -o wide
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
ruoyi-mysql NodePort 10.96.58.67 none 3306:30306/TCP 4s io.kompose.serviceruoyi-mysql验证MySQL服务
可以直接进入容器通过MySQL自带的命令行客户端进行测试连接mysql -uroot -p。可以使用busybox验证集群内部是否可以正常连接MySQL数据库。由于暴露了服务端口30306也可以通过远程的数据库客户端进行连接测试。
# 进入mysql的服务测试客户端连接mysql -uroot -p
kubectl exec -it pod/ruoyi-mysql-8c779d94c-b7r9n -n ruoyi-basic -- /bin/bash# 使用Busybox进行数据库连接测试以服务名的方式
[rootk8s-master ~]# kubectl exec -it pod/busybox -- /bin/sh
/ # telnet ruoyi-mysql.ruoyi-basic.svc.cluster.local:3306
J
8.0.27,~_xJ{C~;f*,mqlcaching_sha2_password远程测试 MySQL 服务状态 导入数据
若依提供了微服务用到的数据库脚本在 MySQL 服务部署完成后可以通过 SQL 文件自行导入脚本。
小总结
这次我们先是借助 kompose 工具实现对 dokcer-compose 的 yaml 到 K8S 的 yaml 的转换经过简单的加工后即可应用部署通过以上操作成功将 MySQL 8.0 部署到了 K8S 集群下一步我们安装下 Nacos v2.2.3 。 If you have any questions or any bugs are found, please feel free to contact me.
Your comments and suggestions are welcome!
