Configuration and use of third-party SSL certificates in Nginx reverse proxy

Nginx is a very popular web server software. It can forward client requests to back-end services through reverse proxy to provide more efficient services. When using Nginx reverse proxy, if you need to use a third-party SSL certificate, you need to perform some configuration and usage steps. This article will detail how to configure and use a third-party SSL certificate in Nginx.

1. Obtain a third-party SSL certificate

Before using a third-party SSL certificate, you first need to apply for a legal SSL certificate. You can apply for an SSL certificate through various channels, such as through a CA organization (such as Digicert, Symantec, Let's Encrypt, etc.) or a hosting service provider (such as a CDN service provider).

When applying for a certificate, you need to provide the domain name and the corresponding certificate binding. After the application is completed, you will get a file containing the certificate and private key. The certificate file is generally in .crt, .pem or .cer format, and the private key file is generally in .key format.

2. Configure Nginx reverse proxy

When using Nginx as a reverse proxy server, you need to add some configuration items to the configuration file in order to correctly handle SSL certificates and HTTPS requests. The following is a simple Nginx reverse proxy configuration example:

server {
    listen 80;
    server_name example.com;
    return 301 https://$server_name$request_uri;
}

server {
    listen 443 ssl;
    server_name example.com;

    ssl_certificate /path/to/certfile.crt;
    ssl_certificate_key /path/to/keyfile.key;

    location / {
        proxy_pass http://backend_server;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
}

The key part of this configuration is to enable SSL on port 443 and set the path to the certificate and private key. In the location, it is set how to forward client requests to the backend service when they arrive.

3. Use Nginx reverse proxy

It is very simple to use the configured Nginx reverse proxy to proxy requests. First, you need to ensure that the certificate file and private key file have been placed in the corresponding path, and then you can access the service that requires proxy through https://example.com.

When the client initiates an HTTPS request, Nginx will perform an SSL handshake based on the configured certificate and private key to ensure that the client is connecting to a legitimate server. If certificate verification fails, the client will not be able to connect to the server.

4. Conclusion

This article introduces how to configure and use a third-party SSL certificate in Nginx so that the Nginx reverse proxy can correctly handle HTTPS requests. It should be noted that the security of SSL certificates is very important. It is recommended to use a formal certificate issuing agency to apply to ensure the validity and security of the certificate.

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