mirror of https://github.com/easzlab/kubeasz.git
104 lines
3.1 KiB
Markdown
104 lines
3.1 KiB
Markdown
# Mariadb 数据库集群
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Mariadb 是从 MySQL 衍生出来的开源关系型数据库，目前兼容 mysql 5.7 版本；它也非常流行，拥有 Google Facebook 等重要企业用户。本文档介绍使用 helm charts 方式安装 mariadb cluster，仅供实践交流使用。
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## 前提条件
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- 已部署 k8s 集群，参考[这里](../setup/quickStart.md)
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- 已部署 helm，参考[这里](../guide/helm.md)
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- 集群提供持久性存储，参考[这里](../setup/08-cluster-storage.md)
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这里演示使用 nfs 动态存储，编辑修改 nfs 存储部分参数
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``` bash
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$ vi roles/cluster-storage/defaults/main.yml
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storage:
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# nfs server 参数
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nfs:
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enabled: "yes" # 启用 nfs
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server: "172.16.3.86" # 设置 nfs 服务器地址
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server_path: "/data/nfs" # 设置共享目录
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storage_class: "nfs-db" # 定义 storage_class，后面pvc要调用这个
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provisioner_name: "nfs-provisioner-01" # 任意命名
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# 配置完成，保存退出，运行下面命令
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$ ansible-playbook /etc/ansible/roles/cluster-storage/cluster-storage.yml
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# 确认nfs provisioner pod
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$ kubectl get pod --all-namespaces |grep nfs
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kube-system nfs-provisioner-01-88694d78c-mrn7f 1/1 Running 0 6m
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```
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## mariadb charts 配置修改
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按照惯例，直接把 chart 下载到本地，然后把配置复制 values.yaml 出来进行修改，这样方便以后整体更新 chart，安装实际使用需要修改配置文件
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``` bash
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$ cd /etc/ansible/manifests/mariadb-cluster
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# 编辑 my-values.yaml 修改以下部分
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service:
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type: NodePort # 方便集群外部访问
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port: 3306
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nodePort:
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master: 33306 # 设置主库的nodePort
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slave: 33307 # 设置从库的nodePort
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rootUser: # 设置 root 密码
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password: test.c0m
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forcePassword: true
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db: # 设置初始测试数据库
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user: hello
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password: hello
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name: hello
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forcePassword: true
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replication: # 设置主从复制
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enabled: true
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user: replicator
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password: R4%forep11CAT0r
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forcePassword: true
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master:
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affinity: {}
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antiAffinity: soft
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tolerations: []
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persistence:
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enabled: true # 启用持久化存储
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mountPath: /bitnami/mariadb
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storageClass: "nfs-db" # 设置使用 nfs-db 存储类
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annotations: {}
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accessModes:
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- ReadWriteOnce
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size: 5Gi # 设置存储容量
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slave:
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replicas: 1
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affinity: {}
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antiAffinity: soft
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tolerations: []
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persistence:
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enabled: false # 从库这里没有启用持久性存储
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```
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## 安装
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使用 helm 安装
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``` bash
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$ cd /etc/ansible/manifests/mariadb-cluster
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$ helm install --name mariadb --namespace default -f my-values.yaml ./mariadb
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```
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## 验证
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``` bash
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$ kubectl get pod,svc | grep mariadb
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pod/mariadb-mariadb-master-0 1/1 Running 0 27m
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pod/mariadb-mariadb-slave-0 1/1 Running 0 29m
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service/mariadb NodePort 10.68.170.168 <none> 3306:33306/TCP 29m
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service/mariadb-mariadb-slave NodePort 10.68.151.95 <none> 3306:33307/TCP 29m
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```
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