How to Set Up Redirects Easily with Docker?

Docker is a really powerful tool. Many services occupy a port number through Docker, and then provide service through port mapping + Nginx Proxy Manager. There's no need to fuss with complicated Nginx setups or control panels like BT Panel. One command and one line of configuration is all it takes.

Recently, though, I ran into a redirect problem. Suppose the service on port 4091 of server A has stopped, and the service has been migrated to server B. What should you do? You want the original domain to point directly to server B. But server B's port already has a reverse proxy configuration, and you can't directly change the pointing configuration on server A. You have to solve it with a web redirect. So how should you handle this?

In that case, you only need to start an Nginx Docker service on the original port 4091, and write a redirect HTML file.

#HTML configuration

First, create a folder called redirect on server A, and then create an HTML file inside it with the redirect logic written in.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="refresh" content="3;url=https://your-new-web">
    <title>Redirecting</title>
</head>
<body>
    <p>xxx 因为什么原因要执行跳转，3s 后自动跳转</p>
    <script>
        setTimeout(function() {
            window.location.href = "https://your-new-web";
        }, 3000);
    </script>
</body>
</html>

#Docker configuration

Next, start an Nginx Docker service with the path where this HTML file is located, and mount the HTML file into it. The command is as follows:

docker run --name redirect-container -v /root/redirect:/usr/share/nginx/html:ro -p 4091:80 -d nginx

That's it. Now try visiting http://a-server-ip:4091 and see whether the page automatically redirects!