kubernetes 部署高可用自动缩容项目（Yii2.0 advanced 高级模板）

前提摘要

目录

  • 1. 安装 NFS 网络插件 （主机 + 从机）
  • 2. 主机 master 开放网络共享项目目录
  • 3. 编写 frontend.conf、backend.conf (nginx 配置文件)
  • 4. 编写 frontend-rc.yaml、backend-rc.yaml (ReplicationController)
  • 5. 编写 advanced-svc.yaml (Service)
  • 6. 创建 ConfigMap 、ReplicationController、Service
  • 7. ReplicationController 添加高可用自动缩容功能
  • 8. kubectl 命令详解

1. 安装 NFS 网络插件 （主机 + 从机）

ubuntu：
# apt-get 方式安装
apt-get install nfs-kernel-server

# 启动并设置开机自动启动
systemctl enable rpcbind
systemctl enable nfs-kernel-server
systemctl start rpcbind
systemctl start nfs-kernel-server
centos：
# yum 方式安装
yum -y install nfs-utils rpcbind 

# 启动并设置开机自动启动
systemctl enable rpcbind
systemctl enable nfs
systemctl start rpcbind
systemctl start nfs

2. 主机 master 开放网络共享项目目录

cat <<EOF > /etc/exports
/usr/share/nginx/html/
EOF

systemctl restart nfs-kernel-server   # ubuntu重启方式
systemctl restart nfs                 # centos重启方式

切换登录其他 node 从机查看

showmount -e 172.21.0.6
image.png

3. 编写 frontend.conf、backend.conf （nginx 配置文件）

frontend.conf
server {
    listen       80;
    server_name  localhost;

    location / {
        root   /usr/share/nginx/html/frontend/web;
        index  index.php index.html index.htm;
        try_files $uri $uri/ /index.php$is_args$args;
    }

    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }

    location ~ \.php$ {
        root           /usr/share/nginx/html/frontend/web;
        fastcgi_pass   unix:/run/php/php7.3-fpm.sock;
        fastcgi_index  index.php;
        fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
        include        fastcgi_params;
    }
}
backend.conf
server {
    listen       80;
    server_name  localhost;

    location / {
        root   /usr/share/nginx/html/backend/web;
        index  index.php index.html index.htm;
        try_files $uri $uri/ /index.php$is_args$args;
    }

    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }

    location ~ \.php$ {
        root           /usr/share/nginx/html/backend/web;
        fastcgi_pass   unix:/run/php/php7.3-fpm.sock;
        fastcgi_index  index.php;
        fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
        include        fastcgi_params;
    }
}

4. 编写 frontend-rc.yaml、backend-rc.yaml （ReplicationController）

frontend-rc.yaml
apiVersion: v1
kind: ReplicationController
metadata:
  name: frontend
spec:
  replicas: 1
  selector:
    app: frontend
  template:
    metadata:
      labels:
        app: frontend
    spec:
      containers:
      - name: frontend
        image: 980315926pxm/lnmp:7.3
        imagePullPolicy: IfNotPresent
        resources:
          requests:
            memory: 64Mi
            cpu: 100m
          limits:
            memory: 128Mi
            cpu: 200m
        livenessProbe:
          exec:
            command: 
              - "/etc/init.d/php7.3-fpm"
              - "start"
        ports:
        - containerPort: 80
        volumeMounts:
        - name: code
          mountPath: /usr/share/nginx/html/
        - name: config
          mountPath: /etc/nginx/conf.d/
      volumes:
      - name: code
        nfs:
          server: 172.21.0.6
          path: "/usr/share/nginx/html/advanced/"
      - name: config
        configMap:
          name: frontend
          items:
            - key: "frontend.conf"
              path: "frontend.conf"
backend-rc.yaml
apiVersion: v1
kind: ReplicationController
metadata:
  name: backend
spec:
  replicas: 1
  selector:
    app: backend
  template:
    metadata:
      labels:
        app: backend
    spec:
      containers:
      - name: backend
        image: 980315926pxm/lnmp:7.3
        imagePullPolicy: IfNotPresent
        resources:
          requests:
            memory: 64Mi
            cpu: 100m
          limits:
            memory: 128Mi
            cpu: 200m
        livenessProbe:
          exec:
            command: 
              - "/etc/init.d/php7.3-fpm"
              - "start"
        ports:
        - containerPort: 80
        volumeMounts:
        - name: code
          mountPath: /usr/share/nginx/html/
        - name: config
          mountPath: /etc/nginx/conf.d/
      volumes:
      - name: code
        nfs:
          server: 172.21.0.6
          path: "/usr/share/nginx/html/advanced/"
      - name: config
        configMap:
          name: backend
          items:
            - key: "backend.conf"
              path: "backend.conf"
注：spec.containers.volumes.nfs.server 参数填写项目主机内网地址（不要抄我的 172.21.0.6）

5. 编写 advanced-svc.yaml （Service 暴露端口：30080、30081）

apiVersion: v1
kind: Service
metadata:
  name: frontend-service
  labels:
    app: frontend
spec:
  type: NodePort
  ports:
  - name: frontend
    port: 80
    nodePort: 30080
  selector:
    app: frontend

---
apiVersion: v1
kind: Service
metadata:
  name: backend-service
  labels:
    app: backend
spec:
  type: NodePort
  ports:
  - name: backend
    port: 80
    nodePort: 30081
  selector:
    app: backend
注：type = NodePort 暴露 port 限制范围（30000~32727）

6. 创建 ConfigMap 、ReplicationController、Service

# ConfigMap 
kubectl create configmap frontend --from-file=frontend.conf
kubectl create configmap backend --from-file=backend.conf

# ReplicationController
kubectl create -f frontend-rc.yaml
kubectl create -f backend-rc.yaml

# Service
kubectl create -f advanced-svc.yaml

7. ReplicationController 添加高可用自动缩容功能

kubectl autoscale rc frontend-rc --min=1 --max=10 --cpu-percent=50
kubectl autoscale rc backend-rc --min=1 --max=10 --cpu-percent=50

默认监测时间：30s
master 检测到项目容器 cpu 使用率上升至 50% 以上时，自动扩充容器数量
master 检测到项目容器 cpu 使用率下降至 50% 以下时，自动缩减容器数量

8. kubectl 命令详解

  • kubectl get po
  • kubectl get rc
  • kubectl get svc
  • kubectl get cm
  • kubectl get hpa
  • kubectl get node
  • kubectl describe po pod.name
  • kubectl describe rc rc.name
  • kubectl describe svc svc.name
  • kubectl describe node node.name
  • kubectl top po
  • kubectl top node
最后编辑于 ：
©著作权归作者所有,转载或内容合作请联系作者
平台声明：文章内容（如有图片或视频亦包括在内）由作者上传并发布，文章内容仅代表作者本人观点，简书系信息发布平台，仅提供信息存储服务。