本文将介绍在kubernetes环境中部署一套php应用系统。前端web采用nginx、中间件php以fastcgi的方式运行，后台数据库由mysql主从提供支撑。
各服务组件之间的调用采用dns解析服务名的方式进行，数据和配置文件持久化采用hostPath。

一、通过dockerfile创建php镜像文件

# cat dockerfile 
FROM docker.io/openshift/base-centos7:latest
MAINTAINER feiyu "akwangj@126.com"
RUN yum makecache
RUN yum -y install php-fpm php php-gd php-mysql php-mbstring php-xml php-mcrypt  php-imap php-odbc php-pear php-xmlrpc  
RUN sed -i 's/listen = 127.0.0.1:9000/listen = 0.0.0.0:9000/' /etc/php-fpm.d/www.conf
RUN sed -i 's/listen.allowed_clients = 127.0.0.1/;listen.allowed_clients = 127.0.0.1/' /etc/php-fpm.d/www.conf

EXPOSE 9000
CMD ["/sbin/php-fpm"]

# docker build -t php:0.1 .

二、部署php

# cat php-deployment.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: php-server
  labels:
    name: php-server
spec:
  replicas: 1
  selector:
    matchLabels:
      app: php-server
  template:
    metadata:
      labels:
        app: php-server
    spec:
      containers:
      - name: php-server
        image: php:0.1
        volumeMounts:
        - mountPath: /var/www/html/
          name: nginx-data
        ports:
        - containerPort: 9000
      volumes:
      - name: nginx-data
        hostPath:
         path: /root/k8s/nmp/html
# cat php-svc.yaml   
apiVersion: v1
kind: Service
metadata:
  name: php
spec:
  ports:
  - name: php
    port: 9000
    protocol: TCP
    targetPort: 9000
  selector:
    app: php-server

kubectl apply -f php-deploy.yaml -f php-svc.yaml

三、部署nginx

cat nginx-deploy.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-php
spec:
  selector:
    matchLabels:
      app: nginx-php
  replicas: 1
  template:
    metadata:
      labels:
        app: nginx-php
    spec:
      containers:
      - name: nginx-php
        image: nginx:latest
        ports:
        - containerPort: 80
        volumeMounts:
        - name: nginx-data
          mountPath: /usr/share/nginx/html
        - name: nginx-conf
          mountPath: /etc/nginx/conf.d/
      volumes:
      - name: nginx-data
        hostPath:
         path: /root/k8s/nmp/html
      - name: nginx-conf
        hostPath:
         path: /root/k8s/nmp/conf

cat nginx-svc.yaml
apiVersion: v1
kind: Service
metadata:
  name: nginx-php
spec:
  type: NodePort
  ports:
  - name: nginx
    port: 80
    protocol: TCP
    targetPort: 80
    nodePort: 30003
  selector:
    app: nginx-php

nginx配置文件

# cat /root/k8s/nmp/conf/default.conf 
server {
    listen       80;
    server_name  localhost;

    #charset koi8-r;
    #access_log  /var/log/nginx/host.access.log  main;

    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;
    }

    #error_page  404              /404.html;

    # redirect server error pages to the static page /50x.html
    #
    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }

    # proxy the PHP scripts to Apache listening on 127.0.0.1:80
    #
    #location ~ \.php$ {
    #    proxy_pass   http://127.0.0.1;
    #}

    # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
    #
    location ~ \.php$ {
    #    root           html;
        fastcgi_pass   php:9000;
        fastcgi_index  index.php;
        fastcgi_param  SCRIPT_FILENAME  /var/www/html/$fastcgi_script_name;
        include        fastcgi_params;
    }

    # deny access to .htaccess files, if Apache's document root
    # concurs with nginx's one
    #
    #location ~ /\.ht {
    #    deny  all;
    #}
}

kubectl apply -f nginx-deploy.yaml -f nginx-svc.yaml
网页访问phpinfo页面测试

四、部署mysql

vi mysql-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: php-mysql
  labels:
    app: mysql
spec:
  replicas: 2
  selector:
    matchLabels:
      app: mysql
  template:
    metadata:
      labels:
        app: mysql
    spec:
      containers:
      - image: mysql:5.7
        name: mysql
        env:
        - name: MYSQL_ROOT_PASSWORD
          valueFrom:
            secretKeyRef:
            #kubectl create secret generic mysql-pass --from-literal=password=Passwd123
              name: mysql-pass
              key: password
        ports:
        - containerPort: 3306
          name: mysql
        volumeMounts:
        - name: mysql-persistent-storage
          mountPath: /var/lib/mysql
      volumes:
      - name: mysql-persistent-storage
        persistentVolumeClaim:
          claimName: mysql-claim

vi mysql-svc.yaml
apiVersion: v1
kind: Service
metadata:
  name: mysql
  labels:
    app: mysql
spec:
  ports:
    - port: 3306
      targetPort: 3306
  selector:
    app: mysql

mysql>  grant all privileges on . to 'root'@'%' identified by 'Passwd123';
Query OK, 0 rows affected, 1 warning (0.05 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.04 sec)

五、下载Discuz应用部署，测试php和mysql主从的连通性
下载地址：http://www.discuz.net/thread-3796882-1-1.html

# cd /root/k8s/nmp/html
# unzip Discuz_X3.3_SC_UTF8.zip 
# mv upload/* ./

通过访问网页进行部署

数据库服务器选择这里是个坑

安装成功，正常访问