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需求

MySQL需求

  1. 名称空间：
    • blog
  2. 镜像
    • mysql:5.7
  3. 环境变量
    • root密码：123
    • 数据库：wp
    • 用户：wp_user
    • 参数：字符集
  4. 数据持久化
  • 映射到宿主机的/data/mysql/data

wordpress需求

  1. 镜像：
    • 官方
  2. 数据库地址
    • cluster ip
  3. 数据库名称
    • wp
  4. 用户
    • www
  5. wordpress数量
    • 单独起2pod
  6. mysql数量
    • 单独起1个pod

使用资源

  1. ns
  2. Controller
    • pod
    • initContainer
    • 存活探针
    • 就绪探针
  3. clusterIP
  4. ingress

交付方案

规划

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# 镜像
wordpress:latest
mysql:5.7

# wordpress资源清单
- namespace
- deployment
- clusterip
- ingress

# mysql资源清单
- namespace
- deployment
- clusterip

# MySQL账户
- root密码：123
- 数据库：wp
- 用户：wp_user
- 参数：字符集

部署NFS服务器

  • 安装NFS

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    # 安装nfs-utils
    yum install -y nfs-utils

  • 创建www用户组进行管理

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    # 创建www组
    groupadd www -g 666

    # 创建www用户
    useradd www -u 666 -s /sbin/nologin -M -g 666

  • 创建文件共享目录并授权

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    # 创建文件共享目录
    mkdir /data

    # 授权www用户、组
    chown www:www /data/

  • 编辑NFS的配置文件

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    # 编辑NFS的配置文件
    vim /etc/exports
    /data/wp 172.16.1.0/24(rw,sync,all_squash,anonuid=666,anongid=666)

  • 启动NFS服务

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    # 启动nfs服务
    systemctl start nfs

资源清单

  • 创建名称空间清单

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    # vim ns-blog.yaml
    apiVersion: v1
    kind: Namespace
    metadata:
       name: blog

  • 创建mysql-dp清单

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    # vim mysql-dp.yaml
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: mysql-dp
      namespace: blog
    spec:
      replicas: 1
      selector:
        matchLabels:
          run: mysql
      template:
        metadata:
          name: mysql-pod
          labels:
            run: mysql
        spec:
          volumes:
          - name: db-data
            hostPath:
              path: /data/mysql/
          containers:
          - name: mysql-container
            image: mysql:5.7
            imagePullPolicy: IfNotPresent
            ports:
            - containerPort: 3306
            env:
            - name: MYSQL_ROOT_PASSWORD
              value: "123"
            - name: MYSQL_DATABASE
              value: "wp"
            - name: MYSQL_USER
              value: "wp_user"
            - name: MYSQL_PASSWORD
              value: "123"
            volumeMounts:
            - name: db-data
              mountPath: /var/lib/mysql
            args:
            - --character-set-server=utf8

  • 创建mysql的service网络资源(Cluster)

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    # vim mysql-service.yaml
    apiVersion: v1
    kind: Service
    metadata:
      name: mysql-cluster
      namespace: blog
    spec:
      selector:
        run: mysql
      ports:
      - name: mysql-port
        port: 3306
        protocol: TCP
        targetPort: 3306
      type: ClusterIP

  • 创建wp清单

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    # vim wordpress-dp.yaml 
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: wp-dp
      namespace: blog
    spec:
      replicas: 2
      selector:
        matchLabels:
          run: wp
      template:
        metadata:
          name: wp-pod
          labels:
            run: wp
        spec:
          volumes: 
          - name: wp-data
            nfs:
              path: /data/wp
              server: 172.16.1.31
          containers:
          - name: wp-container
            image: wordpress
            imagePullPolicy: IfNotPresent
            env:
            - name: WORDPRESS_DB_HOST
              value: "mysql-cluster"
            - name: WORDPRESS_DB_NAME
              value: "wp"
            - name: WORDPRESS_DB_USER
              value: "wp_user"
            - name: WORDPRESS_DB_PASSWORD
              value: "123"
            volumeMounts:
            - name: wp-data
              mountPath: /var/www/html

  • 创建wp的service网络资源(Cluster)

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    # vim wp-svc.yaml 
    apiVersion: v1
    kind: Service
    metadata:
      name: wp-cluster
      namespace: blog
    spec:
      selector: 
        run: wp
      ports:
      - name: wp-port
        port: 80
        protocol: TCP
        targetPort: 80
      type: ClusterIP

  • 创建wp的ingress资源

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    # wp-ingress
    apiVersion: networking.k8s.io/v1
    kind: Ingress
    metadata:
      name: wp-ingress
      namespace: blog
    spec:
      rules:
      - host: blog.xxx.com
        http:
          paths:
          - path: /
            pathType: ImplementationSpecific
            backend:
              service:
                name: wp-cluster
                port:
                  number: 80

  • 优化合并资源清单

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    # vim wp_mysql.yaml
    ---
    apiVersion: v1
    kind: Namespace
    metadata:
       name: blog

    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: mysql-dp
      namespace: blog
    spec:
      replicas: 1
      selector:
        matchLabels:
          run: mysql
      template:
        metadata:
          name: mysql-pod
          labels:
            run: mysql
        spec:
          volumes:
          - name: db-data
            hostPath:
              path: /data/mysql/
          containers:
          - name: mysql-container
            image: mysql:5.7
            imagePullPolicy: IfNotPresent
            ports:
            - containerPort: 3306
            env:
            - name: MYSQL_ROOT_PASSWORD
              value: "123"
            - name: MYSQL_DATABASE
              value: "wp"
            - name: MYSQL_USER
              value: "wp_user"
            - name: MYSQL_PASSWORD
              value: "123"
            volumeMounts:
            - name: db-data
              mountPath: /var/lib/mysql
            args:
            - --character-set-server=utf8

    ---
    apiVersion: v1
    kind: Service
    metadata:
      name: mysql-cluster
      namespace: blog
    spec:
      selector:
        run: mysql
      ports:
      - name: mysql-port
        port: 3306
        protocol: TCP
        targetPort: 3306
      type: ClusterIP

    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: wp-dp
      namespace: blog
    spec:
      replicas: 2
      selector:
        matchLabels:
          run: wp
      template:
        metadata:
          name: wp-pod
          labels:
            run: wp
        spec:
          volumes: 
          - name: wp-data
            nfs:
              path: /data/wp
              server: 172.16.1.31
          containers:
          - name: wp-container
            image: wordpress
            imagePullPolicy: IfNotPresent
            env:
            - name: WORDPRESS_DB_HOST
              value: "mysql-cluster"
            - name: WORDPRESS_DB_NAME
              value: "wp"
            - name: WORDPRESS_DB_USER
              value: "wp_user"
            - name: WORDPRESS_DB_PASSWORD
              value: "123"
            volumeMounts:
            - name: wp-data
              mountPath: /var/www/html

    ---
    apiVersion: v1
    kind: Service
    metadata:
      name: wp-cluster
      namespace: blog
    spec:
      selector: 
        run: wp
      ports:
      - name: wp-port
        port: 80
        protocol: TCP
        targetPort: 80
      type: ClusterIP

    ---
    apiVersion: networking.k8s.io/v1
    kind: Ingress
    metadata:
      name: wp-ingress
      namespace: blog
    spec:
      rules:
      - host: blog.xxx.com
        http:
          paths:
          - path: /
            pathType: ImplementationSpecific
            backend:
              service:
                name: wp-cluster
                port:
                  number: 80

应用资源清单

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# 应用资源清单
kubectl apply -f wp_mysql.yaml

资源检查

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# 检查pod启动状态
kubectl get pod -n blog 
NAME                       READY   STATUS    RESTARTS   AGE
mysql-dp-5bb7dc754-96ttd   1/1     Running   0          43s
wp-dp-5699cdcf58-q24wf     1/1     Running   1          43s
wp-dp-5699cdcf58-rbbtd     1/1     Running   0          43s

# 检查service网络资源状态
kubectl get svc -n blog 
NAME            TYPE        CLUSTER-IP    EXTERNAL-IP   PORT(S)    AGE
mysql-cluster   ClusterIP   10.1.80.196   <none>        3306/TCP   78s
wp-cluster      ClusterIP   10.1.35.27    <none>        80/TCP     78s

# 查看MySQL的service网络资源详细状态
kubectl describe svc -n blog mysql-cluster 
Name:              mysql-cluster
Namespace:         blog
Labels:            <none>
Annotations:       <none>
Selector:          run=mysql
Type:              ClusterIP
IP:                10.1.80.196
Port:              mysql-port  3306/TCP
TargetPort:        3306/TCP
Endpoints:         10.2.1.46:3306
Session Affinity:  None
Events:            <none>

# 查看wp的service网络资源详细状态
kubectl describe svc -n blog wp-cluster 
Name:              wp-cluster
Namespace:         blog
Labels:            <none>
Annotations:       <none>
Selector:          run=wp
Type:              ClusterIP
IP:                10.1.35.27
Port:              wp-port  80/TCP
TargetPort:        80/TCP
Endpoints:         10.2.1.47:80,10.2.2.27:80
Session Affinity:  None 
Events:            <none>

# 查看ingress网络资源的状态
kubectl get -n blog ingress wp-ingress
NAME         CLASS    HOSTS          ADDRESS   PORTS   AGE
wp-ingress   <none>   blog.xxx.com             80      4m