How to deploy multiple Node.js instances

With the widespread application of Node.js in web development, more and more projects require deployment between multiple Node.js instances. This article aims to explore how to deploy multiple Node.js instances.

1. Use PM2 to deploy multiple Node.js instances

PM2 is a popular Node.js process manager that can be used to start, stop, restart, and monitor and automate running Node.js applications. PM2 can also be used to deploy multiple Node.js instances.

The steps are as follows:

1.1 Install PM2

Use the following command to install PM2:

npm install -g pm2

1.2 Start the application

Use the following command Start the Node.js application:

pm2 start app.js

where app.js is the entry file of your application.

1.3 Configure load balancing

By default, PM2 only starts one Node.js instance. If you want to deploy multiple instances, you need to configure load balancing. You can use PM2's "load balancing mode" to launch multiple instances.

Use the following command to start the load balancing mode:

pm2 start app.js -i max

where max means to start as many Node.js instances as possible.

1.4 Monitoring Process

Use the following command to view all processes monitored by PM2:

pm2 list

Use the following command to view the status of a specific process:

pm2 show process_id

whereprocess_id is the identifier of the process.

2. Use Nginx to deploy multiple Node.js instances

Nginx is a high-performance web server and reverse proxy server that can be used to deploy multiple Node. js example.

The steps are as follows:

2.1 Install Nginx

Use the following command to install Nginx:

sudo apt-get install nginx

2.2 Configure Nginx

Open the Nginx configuration file :

sudo nano /etc/nginx/sites-available/default

Add the following in the server block:

upstream nodejs {
    server 127.0.0.1:3000;
    server 127.0.0.1:3001;
    server 127.0.0.1:3002;
    # 可以添加更多的Node.js实例
}

server {
    listen 80;
    server_name example.com;

    location / {
        proxy_pass http://nodejs;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }
}

where 127.0.0.1:3000, 127.0.0.1:3001 and 127.0.0.1:3002 are the address and port number of your Node.js instance, which can be changed according to your actual situation.

2.3 Restart Nginx

Use the following command to restart the Nginx service:

sudo service nginx restart

3. Use Docker to deploy multiple Node.js instances

Docker is an open source containerization platform that can be used to deploy multiple Node.js instances.

The steps are as follows:

3.1 Install Docker

First you need to install Docker. Docker supports different platforms. You can download the Docker installer suitable for your system on the official website for installation.

3.2 Build a Docker image

Use the following command to create a Docker image:

docker build -t my-node-app .

where my-node-app is the name of the Docker image, you can Make changes based on your actual situation.

3.3 Start the Docker container

Use the following command to start a Docker container and map the container to the port of the host:

docker run -p 3000:3000 -d my-node-app

where 3000 is The port number of the Node.js application, which can be changed according to your actual situation.

3.4 Copy and extend

Use the following command to copy and extend the Docker container:

docker-compose up --scale my-node-app=3

where my-node-app is the name of the container,3 is the number of containers you want to start, which can be changed according to your actual situation.

Summary

This article introduces three methods of deploying multiple Node.js instances: using PM2, using Nginx and using Docker. In actual applications, choose the appropriate method for deployment as needed to obtain the best performance and reliability.

The above is the detailed content of How to deploy multiple Node.js instances. For more information, please follow other related articles on the PHP Chinese website!