NGINX PM2 VPS: Build a highly available and scalable application service architecture

NGINX PM2 VPS: Build a highly available and scalable application service architecture

With the rapid development of Internet technology, build a highly available and scalable application service architecture become more and more important. NGINX, PM2 and VPS are commonly used tools that can help us achieve this goal. This article will introduce how to use NGINX, PM2 and VPS to build a highly available and scalable application service architecture, and provide specific code examples.

1. NGINX: High-performance reverse proxy server

NGINX is a high-performance reverse proxy server that can be used for load balancing, caching static resources, SSL terminal and other functions. The following is a simple NGINX configuration example to forward all traffic to the backend application server:

http {
    upstream backend {
        server backend1.example.com;
        server backend2.example.com;
    }

    server {
        listen 80;
        server_name example.com;

        location / {
            proxy_pass http://backend;
        }
    }
}

In the above configuration, we have defined a backend server named backend Group contains multiple backend application servers. The proxy_pass directive forwards traffic to the backend server group.

2. PM2: Process Management Tool

PM2 is a powerful process management tool that can help us manage and monitor Node.js applications. The following is a simple PM2 configuration example:

{
    "apps": [{
        "name": "my-app",
        "script": "app.js",
        "instances": "max",
        "exec_mode": "cluster",
        "error_file": "logs/error.log",
        "out_file": "logs/out.log",
        "log_date_format": "YYYY-MM-DD HH:mm:ss",
        "env": {
            "NODE_ENV": "production"
        }
    }]
}

In the above configuration, we defined an application named my-app and specified the application’s main file app .js. instances specifies the number of instances of the application, exec_mode specifies the execution mode of the application. In addition, we can also configure the application’s log files, environment variables, etc.

3. VPS: Virtual Private Server

VPS is a virtualization technology that can divide a physical server into multiple virtual private servers. VPS provides independent resources to meet the needs of applications. The following is a simple VPS configuration example:

{
    "name": "my-vps",
    "provider": "digitalocean",
    "region": "nyc3",
    "size": "s-1vcpu-1gb",
    "ssh_keys": ["my-public-key"],
    "backups": false
}

In the above configuration, we defined a VPS named my-vps and specified the VPS provider, region, and size , SSH keys, backup and other configurations.

4. Build a highly available and scalable application service architecture

To build a highly available and scalable application service architecture, we can combine NGINX, PM2 and VPS Combined. The following is a simple application service architecture diagram:

          +---------+
          |   NGINX |
          +---------+
               |
          +---------+
          |   PM2   |
          +---------+
               |
          +---------+
          |   VPS   |
          +---------+
               |
          +---------+
          |   APP   |
          +---------+

In the above architecture, NGINX is responsible for receiving external requests and forwarding traffic to the back-end PM2 cluster. PM2 is responsible for managing and monitoring the processes of Node.js applications. VPS provides independent resources to ensure application availability and scalability.

5. Specific code example

The following is a specific code example that demonstrates how to use NGINX, PM2 and VPS to build a highly available and scalable application service architecture .

First, install NGINX and PM2 on the VPS, and configure NGINX's reverse proxy:

# 安装 NGINX
sudo apt-get install nginx

# 安装 PM2
sudo npm install -g pm2

# 创建 NGINX 配置文件
sudo nano /etc/nginx/conf.d/my-app.conf

In the NGINX configuration file, add the following content:

upstream backend {
    server 127.0.0.1:3000;
    server 127.0.0.1:3001;
}

server {
    listen 80;
    server_name my-app.com;

    location / {
        proxy_pass http://backend;
    }
}

Save and Exit the file. Then, deploy the Node.js application to the VPS and use PM2 to manage the application's process:

# 在 VPS 上克隆应用代码
git clone https://github.com/my-app.git

# 进入应用目录
cd my-app

# 安装应用依赖
npm install

# 启动应用
pm2 start app.js -i max

Save and exit the file. Finally, restart the NGINX server:

sudo systemctl restart nginx

Now, we have successfully built a highly available and scalable application service architecture that can access our application through the NGINX domain name.

Conclusion

This article introduces how to use NGINX, PM2 and VPS to build a highly available and scalable application service architecture. By properly configuring and managing these tools, we can improve application availability and performance and achieve rapid expansion. I hope these code examples will be helpful to readers in building their own application service architecture.

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