K8S部署LNMP集群访问wordpress[通俗易懂]

大家好，又见面了，我是你们的朋友全栈君。

部署k8s集群架构：

192.168.175.128 k8s-master

192.168.175.130 k8s-node1

192.168.175.131 k8s-node2

192.168.175.132 harbor/glusterfs/nfs

一、构建底层镜像Dockerfile
上传至Harbor仓库中，具体仓库的搭建请看前面的博客

(1)nginx：需要有一个默认的nginx.conf，以及nginx1.12编译安装包

nginx.conf配置如下：

[root@glusterfs-master nginx]# cat nginx.conf
user root;
worker_processes auto;

error_log logs/error.log info;

pid logs/nginx.pid;

events {

use epoll;
}

http {

include mime.types;
default_type application/octet-stream;

    log_format main ‘$remote_addr – $remote_user [$time_local] “$request” ‘
                      ‘$status $body_bytes_sent “$http_referer” ‘
                      ‘”$http_user_agent” “$http_x_forwarded_for”‘;

    access_log logs/access.log main;
    sendfile        on;
    keepalive_timeout 65;

   # server {

   #     listen 80;
   #     server_name localhost;
   #     root html;
   #     index index.html index.php;

   #     location / {

   #         root html;
   #         index index.html;
   #     }
   # }
    include   vhost/*.conf;
}

nginx Dockerfile如下

[root@glusterfs-master nginx]# cat Dockerfile
FROM centos:7
MAINTAINER wujunqi
RUN rpm –import /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
RUN yum install -y gcc gcc-c++ make openssl-devel pcre-devel
ADD nginx-1.12.1.tar.gz /tmp

RUN cd /tmp/nginx-1.12.1 && \
    ./configure –prefix=/usr/local/nginx && \
    make -j 2 && \
    make install

RUN rm -rf /tmp/nginx-1.12.1* && yum clean all

COPY nginx.conf /usr/local/nginx/conf

WORKDIR /usr/local/nginx
EXPOSE 80
CMD [“./sbin/nginx”, “-g”, “daemon off;”]

(2)php：php编译版本为php-5.6.31，需要有一个默认的php.ini文件

php Dockerfile如下

[root@glusterfs-master php]# cat Dockerfile
FROM 192.168.175.132/centos/centos7
MAINTAINER wujunqi

RUN yum install -y gcc gcc-c++ make gd-devel libxml2-devel libcurl-devel libjpeg-devel libpng-devel openssl-devel
ADD php-5.6.31.tar.gz /tmp/

RUN cd /tmp/php-5.6.31 && \
    ./configure –prefix=/usr/local/php \
    –with-config-file-path=/usr/local/php/etc \
    –with-mysql –with-mysqli \
    –with-openssl –with-zlib –with-curl –with-gd \
    –with-jpeg-dir –with-png-dir –with-iconv \
    –enable-fpm –enable-zip –enable-mbstring && \
    make -j 2 && \
    make install && \
    cp /usr/local/php/etc/php-fpm.conf.default /usr/local/php/etc/php-fpm.conf && \
    sed -i “s/127.0.0.1/0.0.0.0/” /usr/local/php/etc/php-fpm.conf && \
    sed -i “21a \daemonize = no” /usr/local/php/etc/php-fpm.conf
COPY php.ini /usr/local/php/etc

RUN rm -rf /tmp/php-5.6.31* && yum clean all

WORKDIR /usr/local/php
EXPOSE 9000
CMD [“./sbin/php-fpm”, “-c”, “/usr/local/php/etc/php-fpm.conf”]

二、构建镜像并上传

# docker build -t 192.168.175.132/nginx/nginx-1.12.1 -f Dockerfile .

# docker build -t 192.168.175.132/php/php-5.6.31 -f Dockerfile . （标记表示上传到哪台harbor主机，以及对应的项目下）

# docker login 192.168.175.132 （登录harbor下的用户，上传的该用户下的指定项目）

# docker push 192.168.175.132/nginx/nginx-1.12.1

# docker push 192.168.175.132/php/php-5.6.31

图片.png

三、k8s-master上配置LNMP的yaml配置文件

①nginx：采用configMap对象，将需要的虚拟主机配置放置在指定位置下加载，指定nodePort让外部网络访问，也可以使用ingress。需要注意的是nginx需要配置会话绑定，不然会话会飘。挂载点使用的是nfs以及configMap，因为很简单，看看就好。启动deployment的时候需要先启动php，要不然nginx会起不来，因为配置文件里需要解析php-server，另外为了能够让集群解析servicename，还需要配置kube-dns的，要不然会有问题。

Nginx Deployment yaml 如下

[root@k8s-master1 wjq]# cat nginx-wjq-deployment.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: nginx-config
data:
http.conf: |-
    server {

        listen 80;
        server_name localhost;
        root /usr/local/nginx/html;
        index index.html index.php;

        location ~ \.php$ {

            root /usr/local/nginx/html;
            fastcgi_pass php-server:9000;
            fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
            include /usr/local/nginx/conf/fastcgi_params;
            fastcgi_connect_timeout 60s;
            fastcgi_read_timeout 300s;
            fastcgi_send_timeout 300s;
        }
    }

—
apiVersion: v1
kind: Service
metadata:
name: wordpress-nginx
labels:
    app: wordpress
spec:
ports:
    – port: 80
selector:
    app: wordpress-nginx
type: NodePort
sessionAffinity: ClientIP
—
apiVersion: apps/v1beta2
kind: Deployment
metadata:
name: wordpress-nginx
labels:
    app: wordpress
spec:
replicas: 1
selector:
    matchLabels:
      app: wordpress-nginx
template:
    metadata:
      labels:
        app: wordpress-nginx
    spec:
      containers:
      – name: nginx
        image: 192.168.175.132/nginx/nginx-1.12.1
        ports:
        – containerPort: 80
          name: wordpress
        volumeMounts:
        – name: wordpress-persistent-storage
          mountPath: /usr/local/nginx/html
        – name: config
          mountPath: /usr/local/nginx/conf/vhost/http.conf
          subPath: http.conf
      volumes:
      – name: wordpress-persistent-storage
        nfs:
          server: 192.168.175.132
          path: /opt/nfs/data
      – name: config
        configMap:
          name: nginx-config

②php

php Deployment yaml如下

[root@k8s-master1 wjq]# cat php-wjq-deployment.yaml
apiVersion: v1
kind: Service
metadata:
name: php-server
labels:
app: lnmp-php
spec:
ports:
– port: 9000
selector:
app: lnmp-php

—
apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: php-wjq-deployment
labels:
    app: lnmp-php
spec:
replicas: 2
template:
    metadata:
      labels:
        app: lnmp-php
    spec:
      containers:
      – name: php
        image: 192.168.175.132/php/php-5.6.31
        ports:
        – containerPort: 9000
        volumeMounts:
        – name: php-html
          mountPath: /usr/local/nginx/html
      volumes:
      – name: php-html
        nfs:
          server: 192.168.175.132
          path: /opt/nfs/data

③mysql：mysql使用glusterfs持久卷的方式挂载/var/lib/mysql，即数据库目录，保证数据库文件不丢失，冗余备份。mysql运行需要数据库密码，即root密码，在这里配置一个secret变量在配置文件中用于读取mysql密码，然后在k8s-master创建一个secret。设置密码为123456.

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

env:
        – name: MYSQL_ROOT_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysql-pass
              key: password

pv-mysql.yaml：mysql持久卷设置，容量大小。

[root@k8s-master1 wjq]# cat pv-mysql.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
name: mysql-pv
spec:
capacity:
    storage: 10Gi
accessModes:
– ReadWriteMany
persistentVolumeReclaimPolicy: Recycle
glusterfs:
    endpoints: “glusterfs-cluster”
    path: “gv0”

pvc-mysql.yaml：持久卷申请。

[root@k8s-master1 wjq]# cat pvc-mysql.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mysql-pvc
spec:
resources:
requests:
storage: 10Gi
accessModes:
– ReadWriteMany

mysql Deployment yaml如下

[root@k8s-master1 wjq]# cat mysql-wjq-deployment.yaml
—
apiVersion: v1
kind: Service
metadata:
name: mysql-service
labels:
app: lnmp-mysql
spec:
ports:
– port: 3306
selector:
app: lnmp-mysql

—
apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: mysql-deployment
labels:
    app: lnmp-mysql
spec:
replicas: 1
template:
    metadata:
      labels:
        app: lnmp-mysql
    spec:
      containers:
      – image: mysql:5.6
        env:
        – name: MYSQL_ROOT_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysql-pass
              key: password
        name: mysql
        ports:
        – containerPort: 3306
        volumeMounts:
        – name: mysql
          mountPath: /var/lib/mysql
      volumes:
      – name: mysql
        #nfs:
          #server: 192.168.175.132
          #path: /opt/nfs/mysql
        persistentVolumeClaim:
          claimName: mysql-pvc