k8s经典实战—搭建WordPress

说明：需要在k8s上部署lnmp环境，建议跟着步骤来端口最好不要改，希望你也能搭建成功，完成这个搭建后你对Kubernetes的技术基本上是入门了。首先看下效果图：

一、部署存储用户持久化存储

1. 准备一块100G磁盘做为LVM逻辑卷(参考：https://www.cnblogs.com/Dev0ps/p/9381244.html)

fdisk -l
fdisk /dev/vdb
mkdir /u01
pvcreate /dev/vdb1
vgcreate vg0 /dev/vdb1
lvcreate -L 99G -n oralv vg0
mkfs.ext4 /dev/vg0/oralv
mount /dev/vg0/oralv /u01/
echo "/dev/vg0/oralv                   /u01                       ext4    defaults        0 0" >>/etc/fstab

用df -h 命令查看：

2、搭建NFS共享存储
2.1 nfs服务端

yum install nfs-utils -y
mkdir -pv /u01/nps/volumes
vim /etc/exports
/u01/nps/volumes    172.31.182.0/24(rw,no_root_squash)  
systemctl start nfs

查看服务是否开启

2.2 创建nps挂载目录

mkdir -pv /u01/nps/volumes/data{mysql,nginx}

2.3 nfs客户端(k8s的node节点都需要安装)

yum install nfs-utils -y

#验证是否可以访问nfs服务端

[root@node01 ~]# showmount -e 172.31.182.145
Export list for 172.31.182.145:
/u01/nps/volumes 172.31.182.0/24
[root@node01 ~]# mount -t nfs 172.31.182.145:/u01/nps/volumes /mnt
echo "172.31.182.145:/u01/nps/volumes                   /mnt                       nfs    defaults        0 0" >>/etc/fstab

二、创建pv

[root@master Dockerfile-lnmp]# cat pv.yaml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: mysql-pv
spec:
  capacity:
    storage: 20Gi
  accessModes:
    - ReadWriteMany
  nfs:
    path: /u01/nps/volumes/data/mysql
    server: 172.31.182.145
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: wp-pv01
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteMany
  nfs:
    path: /u01/nps/volumes/data/nginx
    server: 172.31.182.145
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: wp-pv02
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteMany
  nfs:
    path: /u01/nps/volumes/data/nginx
    server: 172.31.182.145

创建pv：

kubectl apply -f pv.yaml

三、部署mysql

3.1 创建mysql-deployment

[root@master Dockerfile-lnmp]# cat mysql-deployment.yaml
apiVersion: v1
kind: Service
metadata:
  name: wordpress-mysql
  labels:
    app: wordpress
spec:
  ports:
    - port: 3306
  selector:
    app: wordpress
    tier: mysql
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mysql-pv-claim
  labels:
    app: wordpress
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 20Gi
---
apiVersion: apps/v1beta2
kind: Deployment
metadata:
  name: wordpress-mysql
  labels:
    app: wordpress
spec:
  selector:
    matchLabels:
      app: wordpress
      tier: mysql
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: wordpress
        tier: mysql
    spec:
      containers:
      - name: mysql
    spec:
      containers:
      - name: mysql
        image: mysql:5.6
        env:
        - name: MYSQL_ROOT_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysql-pass
              key: password
        ports:
        - containerPort: 3306
          name: mysql
        volumeMounts:
        - mountPath: "/var/lib/mysql"
          name: mysql-data
      volumes:
      - name: mysql-data
        persistentVolumeClaim:
          claimName: mysql-pv-claim

创建mysql容器：

kubectl apply -f mysql-deployment.yaml

3.2 通过secret创建mysql密码

kubectl create secret generic mysql-pass --from-literal=password=123456

四、上传镜像到Harbor

4.1 构建nginx镜像并上传

[root@master nginx]# docker build -t 172.31.182.143/dev/nginx:latest .
[root@master nginx]# docker push 172.31.182.143/dev/nginx:latest

4.2 构建php镜像并上传

[root@master php]# docker build -t 172.31.182.143/dev/php:latest .
[root@master php]# docker push 172.31.182.143/dev/php:latest

4.3 kubernetes配置Harbor仓库

kubectl create secret docker-registry regcred --docker-server=172.31.182.143 --docker-username=admin --docker-password=Harbor%12345 --docker-email=admin@qq.com

注意！！上述由于没有指定namespace默认会在default命名空间下创建secret，如果是别的ns需在后面指定如：-n test 否则test命名空间下的pod仍然无法拉取私有仓库镜像。

五、部署php环境

5.1 创建php-deployment
[root@master Dockerfile-lnmp]# cat php-deployment.yaml

apiVersion: v1
kind: Service
metadata:
  name: wordpress-php
  labels:
    app: wordpress
spec:
  ports:
    - port: 9000
  selector:
    app: wordpress-php
    tier: frontend
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: wp-pvc01
  labels:
    app: wordpress
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 5Gi
---
apiVersion: apps/v1beta2
kind: Deployment
metadata:
  name: wordpress-php
  labels:
    app: wordpress
spec:
  replicas: 3
  selector:
    matchLabels:
      app: wordpress-php
      tier: frontend
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: wordpress-php
        tier: frontend
    spec:
      imagePullSecrets:
      - name: regcred
      containers:
      - name: php
        image: 172.31.182.143/dev/php:latest
        ports:
        - containerPort: 9000
          name: wordpress
        volumeMounts:
        - name: php-data
          mountPath: "/usr/local/nginx/html"
      volumes:
      - name: php-data
        persistentVolumeClaim:
          claimName: wp-pvc01

注意：在yaml文件中需加入secret用于访问镜像仓库。

      imagePullSecrets:
      - name: regcred

创建php容器：

kubectl apply -f php-deployment.yaml

六、部署nginx环境

6.1 创建nginx-deployment
[root@master Dockerfile-lnmp]# cat nginx-deployment.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: nginx-wp-config
data:
  site.conf: |-
    server {
        listen 80;
        server_name localhost;
        root html;
        index index.php index.html;

        location ~ \.php$ {
            root html;
            fastcgi_pass wordpress-php:9000;
            fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
            include fastcgi_params;
        }
    }
---
apiVersion: v1
kind: Service
metadata:
  name: wordpress-nginx
  labels:
    app: wordpress
spec:
  ports:
    - port: 80
  selector:
    app: wordpress-nginx
    tier: frontend
  type: NodePort
  sessionAffinity: ClientIP
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: wp-pvc02
  labels:
    app: wordpress
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 5Gi
---
apiVersion: apps/v1beta2
kind: Deployment
metadata:
  name: wordpress-nginx
  labels:
    app: wordpress
spec:
  replicas: 3
  selector:
    matchLabels:
      app: wordpress-nginx
      tier: frontend
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: wordpress-nginx
        tier: frontend
    spec:
      imagePullSecrets:
      - name: regcred
      containers:
      - name: nginx
        image: 172.31.182.143/dev/nginx:latest
        ports:
        - containerPort: 80
          name: wordpress
        volumeMounts:
        - mountPath: "/usr/local/nginx/html"
          name: nginx-data
        - mountPath: "/usr/local/nginx/conf/vhost/site.conf"
          name: config
          subPath: site.conf
      volumes:
      - name: nginx-data
        persistentVolumeClaim:
          claimName: wp-pvc02
      - name: config
        configMap:
          name: nginx-wp-config

创建nginx容器：

kubectl apply -f nginx-deployment.yaml

七、查看pod,svc,pv,pvc,secret的状态

7.1 kubectl get pod

7.2 kubectl get svc

我这里wordpress-nginx的NodePort随机生成是47074，访问时改为你们自己生成的即可！！
7.3 kubectl get pv,pvc

7.4 kubectl get secret

八、创建wordpress数据库

[root@master nginx]# kubectl exec -it wordpress-mysql-68cb6cc5b4-xxfhh bash

root@wordpress-mysql-68cb6cc5b4-xxfhh:/# mysql -uroot -p123456
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 105
Server version: 5.6.43 MySQL Community Server (GPL)

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Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> create database wordpress;