zrok/docs/v0.3_nginx_tls_guide.md

# Nginx Reverse Proxy for zrok

I'll assume you have a running zrok controller and public frontend and wish to front both with Nginx providing server TLS. Go back to [the self-hosting guide](v0.3_self_hosting_guide.md) if you still need to spin those up.

## Choose a Reverse Proxy Address

I'll use `https://api.zrok.quigley.com:443` in this example, and assume you already set up wildcard DNS like `*.zrok.quigley.com`. This lets us elect `api.zrok.quigley.com` as the controller DNS name, and forward any other incoming requests to the zrok public frontend.

## Obtain a Wildcard Server Certificate

You must complete a DNS challenge to obtain a wildcard certificate from Let's Encrypt. I'll assume you know how to create the necessary TXT record in the DNS zone you're using with zrok.

1. Install certbot: https://eff-certbot.readthedocs.io/en/stable/install.html
2. Run certbot with the manual plugin: https://certbot.eff.org/docs/using.html#manual

    ```bash
    # install cert for *.zrok.quigley.com in /etc/letsencrypt
    sudo certbot certonly --manual
    ````

## [Install Nginx](https://www.nginx.com/resources/wiki/start/topics/tutorials/install/)

## Configure Nginx

```
server {
    listen              443 ssl;
    server_name         api.zrok.quigley.com;
    ssl_certificate     /etc/letsencrypt/live/zrok.quigley.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/zrok.quigley.com/privkey.pem;
    ssl_protocols       TLSv1 TLSv1.1 TLSv1.2;
    ssl_ciphers         HIGH:!aNULL:!MD5;

    location / {
      proxy_pass      http://127.0.0.1:18080;
      error_log       /var/log/nginx/zrok-controller.log;
    }

}

server {
    listen              443 ssl;
    server_name         *.zrok.quigley.com;
    ssl_certificate     /etc/letsencrypt/live/zrok.quigley.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/zrok.quigley.com/privkey.pem;
    ssl_protocols       TLSv1 TLSv1.1 TLSv1.2;
    ssl_ciphers         HIGH:!aNULL:!MD5;

    location / {
      proxy_pass       http://127.0.0.1:8080;
      proxy_set_header Host $host;
      error_log        /var/log/nginx/zrok-frontend.log;
      proxy_busy_buffers_size   512k;
      proxy_buffers    4 512k;
      proxy_buffer_size   256k;

    }

}
```

## Restart Nginx

Load the new configuration by restarting Nginx. Check the logs to make sure it's happy.

> Started A high performance web server and a reverse proxy server.

## Check the Firewall

If you followed the non-TLS quickstart then you may have opened 8080,108080/tcp in your firewall. You can go ahead and replace those exceptions with 443/tcp because only Nginx needs to be reachable for zrok to function.

## Update the zrok Frontend

List available frontends to obtain the token identifier of the frontend named "public". You may need to set `ZROK_ADMIN_TOKEN` or `ZROK_API_ENDPOINT` before running `zrok admin`.

```bash
$ zrok admin list frontends

 TOKEN         ZID        PUBLIC NAME  URL TEMPLATE                              CREATED AT                         UPDATED AT                    
 2NiDTRYUww18  7DsLh9DXG  public       http://{token}.zrok.quigley.com:8080  2023-01-19 05:29:20.793 +0000 UTC  2023-01-19 06:17:25 +0000 UTC 
```

Update the URL template to use Nginx.

```bash
$ zrok admin update frontend 2NiDTRYUww18 --url-template https://{token}.zrok.quigley.com:443
[   0.028]    INFO main.(*adminUpdateFrontendCommand).run: updated global frontend '2NiDTRYUww18'
```