How to bind domain name with docker

With the continuous development of cloud computing technology, Docker containerization technology has become one of the most popular technologies in modern cloud computing. Docker containers not only provide rapid application deployment, but also provide flexibility and portability. However, for an enterprise-level application, binding domain names is crucial. This article will introduce how to bind a domain name in a Docker container.

1. What is domain name binding?

When deploying a Web application, ensure that the application can be correctly located when users access it. For this problem, we usually use a domain name to map the application to the server. This process is called "domain name binding".

In the Docker container, we can also use the same method to bind the domain name. The following are two common methods of domain name binding in Docker.

2. Use Nginx as a reverse proxy

Nginx is a popular web server and reverse proxy server. Due to its high performance, stability and scalability, Nginx is increasingly used in web servers.

In order to use Nginx to bind a domain name in a Docker container, you need to follow the steps below.

Step 1: Create Nginx reverse proxy container

We need to create an Nginx reverse proxy service for the application. You can run the following commands in the container.

$ docker run -d -p 80:80 --name nginx-proxy jwilder/nginx-proxy

Note that this will run a new container inside Docker that will listen on port 80.

Step 2: Run the application container

Next, we need to start our application in the Docker container. For example, if we want to deploy a Node.js application, we can execute the following command.

$ docker run -d -e VIRTUAL_HOST=example.com --name node-app node-app

In this example, our application will be bound to the example.com domain name. The VIRTUAL_HOST environment variable is a must for using the jwilder/nginx-proxy container, it will ensure that our DNS requests end up reaching the correct container.

Step 3: Configure DNS

Finally, we need to configure our DNS to point to the reverse proxy container. For DNS configuration, we can use Docker Swarm or manually configure the DNS server.

Now, we have successfully used NGINX to bind the domain name in the Docker container.

3. Use Docker's built-in link

Docker has a built-in mechanism called "link" that can communicate between containers. By using this mechanism, we can access services in another container from one container.

In order to use "link" to bind a domain name in a Docker container, you need to follow the steps below.

Step 1: Create the Application Container

First, start our application in the Docker container. For example, if we want to deploy a Node.js application, we can execute the following command.

$ docker run -d --name node-app node-app

Step 2: Create links

Next, we need to create links between other containers on the same Docker host. For example, if we want to use Nginx reverse proxy, we can execute the following command.

$ docker run -d -p 80:80 --link node-app:node-app --name nginx-proxy nginx-proxy

In this example, we link the Nginx reverse proxy container into our Node.js container.

Step 3: Configure DNS

Finally, we need to configure DNS to point to the reverse proxy container. For DNS configuration, we can use Docker Swarm or manually configure the DNS server.

Now, we have successfully bound the domain name using a link in the Docker container.

Summary

In this article, we discussed two common ways to implement domain name binding in Docker containers. Using Nginx as a reverse proxy provides more advanced functionality, but is also more complex and requires a deeper understanding. However, Docker's built-in linking is a simpler method that only requires executing some basic commands.

No matter which method you choose, binding a domain name is critical to a modern enterprise-level application. I hope this article has inspired you and can come in handy for your next Docker project.

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