all-in-one/reverse-proxy.md

Reverse Proxy Documentation

A reverse proxy is basically a web server that enables computers on the internet to access a service in a private subnet.

Please note: Publishing the AIO interface with a valid certificate to the public internet is not the goal of this documentation! Instead, the main goal is to publish Nextcloud with a valid certificate to the public internet which is not running inside the mastercontainer but in a different container! If you need a valid certificate for the AIO interface, see point 5.

In order to run Nextcloud behind a web server or reverse proxy (like Apache, Nginx, Cloudflare Tunnel and else), you need to specify the port that AIO's Apache container shall use, add a specific config to your web server or reverse proxy and modify the startup command a bit. All examples below will use port 11000 as example APACHE_PORT which will be exposed on the host to receive unencrypted HTTP traffic from the reverse proxy. Advice: If you need https between Nextcloud and the reverse proxy because it is running on a different server in the same network, simply add another reverse proxy to the chain that runs on the same server like AIO and takes care of https proxying (most likely via self-signed cert). Another option is to create a VPN between the server that runs AIO and the server that runs the reverse proxy which takes care of encrypting the connection.

Attention: The process to run Nextcloud behind a reverse proxy consists of at least steps 1, 2 and 4:

1. Configure the reverse proxy! See point 1
2. Use this startup command! See point 2
3. Optional: If the reverse proxy is installed on the same host and in the host network, you should limit the apache container to only listen on localhost. See point 3
4. Open the AIO interface. See point 4
5. Optional: Get a valid certificate for the AIO interface! See point 5
6. Optional: How to debug things? See point 6

Please note: Since the Apache container gets created by the mastercontainer, there is NO way to provide custom docker labels or custom environmental variables for the Apache container. So please do not attempt to do this because you will fail! Only the documented way will work!

1. Configure the reverse proxy

Adapting the sample web server configurations below

1. Replace <your-nc-domain> with the domain on which you want to run Nextcloud.

2. Adjust the port 11000 to match your chosen APACHE_PORT.

3. Adjust localhost or 127.0.0.1 to point to the Nextcloud server IP or domain depending on where the reverse proxy is running. See the following options.

   On the same server without a container

   For this setup, the default sample configurations with localhost:$APACHE_PORT should work.

   On the same server in a Docker container

   For this setup, you can use as target host.docker.internal:$APACHE_PORT instead of localhost:$APACHE_PORT. ⚠️ Important: In order to make this work on Docker for Linux, you need to add --add-host=host.docker.internal:host-gateway to the docker run command of your reverse proxy container or extra_hosts: ["host.docker.internal:host-gateway"] in docker compose (it works on Docker Desktop by default).

   Another option and actually the recommended way in this case is to use --network host option (or network_mode: host for docker-compose) as setting for the reverse proxy container to connect it to the host network. If you are using a firewall on the server, you need to open ports 80 and 443 for the reverse proxy manually. By doing so, the default sample configurations that point at localhost:$APACHE_PORT should work without having to modify them.

   On a different server (in container or not)

   Use the private ip-address of the host that shall be running AIO. So e.g. private.ip.address.of.aio.server:$APACHE_PORT instead of localhost:$APACHE_PORT.

   If you are not sure how to retrieve that, you can run: ip a | grep "scope global" | head -1 | awk '{print $2}' | sed 's|/.*||' on the server that shall be running AIO (the commands only work on Linux).

Apache

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Disclaimer: It might be possible that the config below is not working 100% correctly, yet. Improvements to it are very welcome!

Add this as a new Apache site config:

(The config below assumes that you are using certbot to get your certificates. You need to create them first in order to make it work.)

<VirtualHost *:80>
    ServerName <your-nc-domain>

    RewriteEngine On
    RewriteCond %{HTTPS} off
    RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}
    RewriteCond %{SERVER_NAME} =<your-nc-domain>
    RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,NE,R=permanent]
</VirtualHost>

<VirtualHost *:443>
    ServerName <your-nc-domain>

    # Reverse proxy based on https://httpd.apache.org/docs/current/mod/mod_proxy_wstunnel.html
    RewriteEngine On
    ProxyPreserveHost On
    AllowEncodedSlashes NoDecode
    
    ProxyPass / http://localhost:11000/ nocanon
    ProxyPassReverse / http://localhost:11000/
    
    RewriteCond %{HTTP:Upgrade} websocket [NC]
    RewriteCond %{HTTP:Connection} upgrade [NC]
    RewriteCond %{THE_REQUEST} "^[a-zA-Z]+ /(.*) HTTP/\d+(\.\d+)?$"
    RewriteRule .? "ws://localhost:11000/%1" [P,L]

    # Enable h2, h2c and http1.1
    Protocols h2 h2c http/1.1
    
    # Solves slow upload speeds caused by http2
    H2WindowSize 5242880

    # TLS
    SSLEngine               on
    SSLProtocol             -all +TLSv1.2 +TLSv1.3
    SSLCipherSuite          ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305
    SSLHonorCipherOrder     off
    SSLSessionTickets       off
    SSLCertificateFile /etc/letsencrypt/live/<your-nc-domain>/fullchain.pem
    SSLCertificateKeyFile /etc/letsencrypt/live/<your-nc-domain>/privkey.pem

    # Disable HTTP TRACE method.
    TraceEnable off
    <Files ".ht*">
        Require all denied
    </Files>

    # Support big file uploads
    LimitRequestBody 0
</VirtualHost>

⚠️ Please note: Look into this to adapt the above example configuration.

To make the config work you can run the following command: sudo a2enmod rewrite proxy proxy_http proxy_wstunnel ssl headers http2

Caddy (Recommended)

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Add this to your Caddyfile:

https://<your-nc-domain>:443 {
    reverse_proxy localhost:11000
}

The Caddyfile is a text file called Caddyfile (no extension) which – if you should be running Caddy inside a container – should usually be created in the same location as your compose.yaml file prior to starting the container.

⚠️ Please note: Look into this to adapt the above example configuration.

Advice: You may have a look at this for a more complete example.

Caddy with ACME DNS-challenge

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You can get AIO running using the ACME DNS-challenge. Here is how to do it.

1. Follow this documentation in order to get a Caddy build that is compatible with your domain provider's DNS challenge.

2. Add this to your Caddyfile:

   https://<your-nc-domain>:443 {
       reverse_proxy localhost:11000
       tls {
           dns <provider> <key>
       }
   }
   

   ⚠️ Please note: Look into this to adapt the above example configuration.

   You also need to adjust <provider> and <key> to match your case.

3. Now continue with point 2 but additionally, add --env SKIP_DOMAIN_VALIDATION=true to the docker run command of the mastercontainer (but before the last line nextcloud/all-in-one:latest) which will disable the domain validation (because it is known that the domain validation will not work when using the DNS-challenge since no port is publicly opened).

Advice: In order to make it work in your home network, you may add the internal ipv4-address of your reverse proxy as A DNS-record to your domain and disable the dns-rebind-protection in your router. Another way it to set up a local dns-server like a pi-hole and set up a custom dns-record for that domain that points to the internal ip-adddress of your reverse proxy (see https://github.com/nextcloud/all-in-one#how-can-i-access-nextcloud-locally). If both is not possible, you may add the domain to the hosts file which is needed then for any devices that shall use the server.

Citrix ADC VPX / Citrix Netscaler

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For a reverse proxy example guide for Citrix ADC VPX / Citrix Netscaler, see this guide by @esmith443: https://github.com/nextcloud/all-in-one/discussions/2452

Cloudflare Tunnel

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Although it does not seem like it is the case but from AIO perspective a Cloudflare Tunnel works like a reverse proxy. Please see the caveats before proceeding. Here is then how to make it work:

1. Install the Cloudflare Tunnel on the same machine where AIO will be running on and point the Tunnel with the domain that you want to use for AIO to http://localhost:11000.
   ⚠️ Please note: Look into this to adapt the above example configuration.
2. Now continue with point 2 but additionally, add --env SKIP_DOMAIN_VALIDATION=true to the docker run command which will disable the domain validation (because it is known that the domain validation will not work behind a Cloudflare Tunnel). So you need to ensure yourself that you've configured everything correctly.

Advice: Make sure to disable Cloudflares Rocket Loader feature as otherwise Nextcloud's login prompt will not be shown.

HaProxy

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Disclaimer: It might be possible that the config below is not working 100% correctly, yet. Improvements to it are very welcome!

Here is an example HaProxy config:

global
    chroot                      /var/haproxy
    log                         /var/run/log audit debug
    lua-prepend-path            /tmp/haproxy/lua/?.lua
    ssl-default-bind-ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305
    ssl-default-bind-ciphersuites TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256
    ssl-default-bind-options ssl-min-ver TLSv1.2 no-tls-tickets

    ssl-default-server-ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305
    ssl-default-server-ciphersuites TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256
    ssl-default-server-options ssl-min-ver TLSv1.2 no-tls-tickets

defaults
    log     global
    option redispatch -1
    retries 3
    default-server init-addr last,libc

# Frontend: LetsEncrypt_443 ()
frontend LetsEncrypt_443
    bind 0.0.0.0:443 name 0.0.0.0:443 ssl crt-list /tmp/haproxy/ssl/605f6609f106d1.17683543.certlist 
    mode http
    option http-keep-alive
    default_backend acme_challenge_backend
    option forwardfor
    # tuning options
    timeout client 30s

    # logging options
    # ACL: find_acme_challenge
    acl acl_605f6d4b6453d2.03059920 path_beg -i /.well-known/acme-challenge/
    # ACL: Nextcloud
    acl acl_60604e669c3ca4.13013327 hdr(host) -i <your-nc-domain>

    # ACTION: redirect_acme_challenges
    use_backend acme_challenge_backend if acl_605f6d4b6453d2.03059920
    # ACTION: Nextcloud
    use_backend Nextcloud if acl_60604e669c3ca4.13013327


# Frontend: LetsEncrypt_80 ()
frontend LetsEncrypt_80
    bind 0.0.0.0:80 name 0.0.0.0:80 
    mode tcp
    default_backend acme_challenge_backend
    # tuning options
    timeout client 30s

    # logging options
    # ACL: find_acme_challenge
    acl acl_605f6d4b6453d2.03059920 path_beg -i /.well-known/acme-challenge/

    # ACTION: redirect_acme_challenges
    use_backend acme_challenge_backend if acl_605f6d4b6453d2.03059920

# Frontend (DISABLED): 1_HTTP_frontend ()

# Frontend (DISABLED): 1_HTTPS_frontend ()

# Frontend (DISABLED): 0_SNI_frontend ()

# Backend: acme_challenge_backend (Added by Let's Encrypt plugin)
backend acme_challenge_backend
    # health checking is DISABLED
    mode http
    balance source
    # stickiness
    stick-table type ip size 50k expire 30m  
    stick on src
    # tuning options
    timeout connect 30s
    timeout server 30s
    http-reuse safe
    server acme_challenge_host 127.0.0.1:43580 

# Backend: Nextcloud ()
backend Nextcloud
    mode http
    balance source
    server Nextcloud localhost:11000 

⚠️ Please note: Look into this to adapt the above example configuration.

Nginx

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Disclaimer: This config was tested and should normally work on all modern nginx version if you configure it correctly. Improvements to the config are very welcome!

Add the below template to your nginx config.

Note: please check your nginx version by running: nginx -v and adjust it the lines marked with version notes, so that they fit your nginx version.

map $http_upgrade $connection_upgrade {
    default upgrade;
    '' close;
}

server {
    listen 80;
    listen [::]:80;            # comment to disable IPv6

    if ($scheme = "http") {
        return 301 https://$host$request_uri;
    }

    listen 443 ssl http2;      # for nginx versions below v1.25.1
    listen [::]:443 ssl http2; # for nginx versions below v1.25.1 - comment to disable IPv6

    # listen 443 ssl;      # for nginx v1.25.1+
    # listen [::]:443 ssl; # for nginx v1.25.1+ - keep comment to disable IPv6
	
    # http2 on;                                 # uncomment to enable HTTP/2        - supported on nginx v1.25.1+
    # http3 on;                                 # uncomment to enable HTTP/3 / QUIC - supported on nginx v1.25.0+
    # quic_retry on;                            # uncomment to enable HTTP/3 / QUIC - supported on nginx v1.25.0+
    # add_header Alt-Svc 'h3=":443"; ma=86400'; # uncomment to enable HTTP/3 / QUIC - supported on nginx v1.25.0+
    # listen 443 quic reuseport;       # uncomment to enable HTTP/3 / QUIC - supported on nginx v1.25.0+ - please remove "reuseport" if there is already another quic listener on port 443 with enabled reuseport
    # listen [::]:443 quic reuseport;  # uncomment to enable HTTP/3 / QUIC - supported on nginx v1.25.0+ - please remove "reuseport" if there is already another quic listener on port 443 with enabled reuseport - keep comment to disable IPv6

    server_name <your-nc-domain>;

    location / {
        proxy_pass http://127.0.0.1:11000$request_uri;

        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Port $server_port;
        proxy_set_header X-Forwarded-Scheme $scheme;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header Accept-Encoding "";
        proxy_set_header Host $host;
    
        client_body_buffer_size 512k;
        proxy_read_timeout 86400s;
        client_max_body_size 0;

        # Websocket
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
    }

    ssl_certificate /etc/letsencrypt/live/<your-nc-domain>/fullchain.pem;   # managed by certbot on host machine
    ssl_certificate_key /etc/letsencrypt/live/<your-nc-domain>/privkey.pem; # managed by certbot on host machine

    ssl_session_timeout 1d;
    ssl_session_cache shared:MozSSL:10m; # about 40000 sessions
    ssl_session_tickets off;

    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305;
    ssl_prefer_server_ciphers on;

    # Optional settings:

    # OCSP stapling
    # ssl_stapling on;
    # ssl_stapling_verify on;
    # ssl_trusted_certificate /etc/letsencrypt/live/<your-nc-domain>/chain.pem;

    # replace with the IP address of your resolver
    # resolver 127.0.0.1; # needed for oscp stapling: e.g. use 94.140.15.15 for adguard / 1.1.1.1 for cloudflared or 8.8.8.8 for google - you can use the same nameserver as listed in your /etc/resolv.conf file
}

⚠️ Please note: Look into this to adapt the above example configuration.

Advice: You may have a look at this for a more complete example.

Nginx-Proxy-Manager

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First, please make sure that the environmental variables PUID and PGID in the compose.yaml file for NPM are either unset or set to 0. If you need to change the GID/PID then please add net.ipv4.ip_unprivileged_port_start=0 at the end of /etc/sysctl.conf. Note: this will cause that non root users can bind privileged ports.

Second, see these screenshots for a working config:

client_body_buffer_size 512k;
proxy_read_timeout 86400s;
client_max_body_size 0;

⚠️ Please note: Look into this to adapt the above example configuration.

Also change <you>@<your-mail-provider-domain> to a mail address of yours.

Nginx-Proxy

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Unfortunately it is not possible to configure nginx-proxy in a way that works because it completely relies on environmental variables of the docker containers itself. Providing these variables does not work as stated above.

If you really want to use AIO, we recommend you to switch to caddy. It is simply amazing!
Of course understandable if that is not possible for you.

Apart from that, there is this: manual-install

Node.js with Express

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Disclaimer: It might be possible that the config below is not working 100% correctly, yet. Improvements to it are very welcome!

For Node.js, we will use the npm package http-proxy. WebSockets must be handled separately.

This example only uses http, but if your Express server already uses a https server, then follow the same instructions for https.

const HttpProxy = require('http-proxy');
const express = require('express');
const http = require('http');

const app = express();
const proxy = HttpProxy.createProxyServer({
	target: 'http://localhost:11000',
	// Timeout can be changed to your liking.
	timeout: 1000 * 60 * 3,
	proxyTimeout: 1000 * 60 * 3,
	// Not 100% certain whether autoRewrite is necessary, but enabling it SEEMS to make it behave more stably.
	autoRewrite: true,
	// Do not enable followRedirects.
	followRedirects: false,
});

// Handle errors with proxy.web and proxy.ws
function onProxyError(err, req, res, target) {
	// Handle errors however you like. Here's an example:
	if (err.code === 'ECONNREFUSED') {
		return res.status(503).send('Nextcloud server is currently not running. It may be down for temporary maintenance.');
	}
	// other errors
	else {
		console.error(err);
		return res.status(500).send(String(err));
	}
}

app.use((req, res) => {
	proxy.web(req, res, {}, onProxyError);
});

const httpServer = http.createServer(app);
httpServer.listen('80');

// Listen for an upgrade to a WebSocket connection.
httpServer.on('upgrade', (req, socket, head) => {
	proxy.ws(req, socket, head, {}, onProxyError);
});

If you are using the Express package vhost for your app, you can use proxy.web inside the vhosted express function (see the following code snippet), but proxy.ws still needs to be done "globally" on your http server. Nextcloud should automatically ignore websocket requests for other domains.

const HttpProxy = require('http-proxy');
const express = require('express');
const http = require('http');

const myNextcloudApp = express();
const myOtherApp = express();
const vhost = express();

// Definitions for proxy and onProxyError unchanged. (see above)

myNextcloudApp.use((req, res) => {
	proxy.web(req, res, {}, onProxyError);
});

vhost.use(vhostFunc('<your-nc-domain>', myNextcloudApp));

const httpServer = http.createServer(app);
httpServer.listen('80');

// Listen for an upgrade to a WebSocket connection.
httpServer.on('upgrade', (req, socket, head) => {
	proxy.ws(req, socket, head, {}, onProxyError);
});

⚠️ Please note: Look into this to adapt the above example configuration.

Synology Reverse Proxy

click here to expand

Disclaimer: It might be possible that the config below is not working 100% correctly, yet. Improvements to it are very welcome!

See these screenshots for a working config:

⚠️ Please note: Look into this to adapt the above example configuration.

Traefik 2

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Disclaimer: It might be possible that the config below is not working 100% correctly, yet. Improvements to it are very welcome!

Traefik's building blocks (router, service, middlewares) need to be defined using dynamic configuration similar to this official Traefik configuration example. Using docker labels won't work because of the nature of the project.

The examples below define the dynamic configuration in YAML files. If you rather prefer TOML, use a YAML to TOML converter.

1. In Traefik's static configuration define a file provider for dynamic providers:

   # STATIC CONFIGURATION
   
   entryPoints:
     https:
       address: ":443" # Create an entrypoint called "https" that uses port 443
       # If you want to enable HTTP/3 support, uncomment the line below
       # http3: {}
   
   certificatesResolvers:
     # Define "letsencrypt" certificate resolver
     letsencrypt:
       acme:
         storage: /letsencrypt/acme.json # Defines the path where certificates should be stored
         email: <your-email-address> # Where LE sends notification about certificates expiring
         tlschallenge: true
   
   providers:
     file:
       directory: "/path/to/dynamic/conf" # Adjust the path according your needs.
       watch: true
   
   # Enable HTTP/3 feature by uncommenting the lines below. Don't forget to route 443 UDP to Traefik (Firewall\NAT\Traefik Container)
   # experimental:
     # http3: true
   

2. Declare the router, service and middlewares for Nextcloud in /path/to/dynamic/conf/nextcloud.yml:

   http:
     routers:
       nextcloud:
         rule: "Host(`<your-nc-domain>`)"
         entrypoints:
           - "https"
         service: nextcloud
         middlewares:
           - nextcloud-chain
         tls:
           certresolver: "letsencrypt"
   
     services:
       nextcloud:
         loadBalancer:
           servers:
             - url: "http://localhost:11000" # Use the host's IP address if Traefik runs outside the host network
   
     middlewares:
       nextcloud-secure-headers:
         headers:
           hostsProxyHeaders:
             - "X-Forwarded-Host"
           referrerPolicy: "same-origin"
   
       https-redirect:
         redirectscheme:
           scheme: https 
   
       nextcloud-chain:
         chain:
           middlewares:
             # - ... (e.g. rate limiting middleware)
             - https-redirect
             - nextcloud-secure-headers
   

---

⚠️ Please note: Look into this to adapt the above example configuration.

Hint: see https://www.youtube.com/watch?v=VLPSRrLMDmA for a video on configuring Traefik.

Others

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Config examples for other reverse proxies are currently not documented. Pull requests are welcome!

2. Use this startup command

After adjusting your reverse proxy config, use the following command to start AIO:

(For a docker-compose example, see the example further below.)

# For Linux:
sudo docker run \
--init \
--sig-proxy=false \
--name nextcloud-aio-mastercontainer \
--restart always \
--publish 8080:8080 \
--env APACHE_PORT=11000 \
--env APACHE_IP_BINDING=0.0.0.0 \
--volume nextcloud_aio_mastercontainer:/mnt/docker-aio-config \
--volume /var/run/docker.sock:/var/run/docker.sock:ro \
nextcloud/all-in-one:latest

Note: You may be interested in adjusting Nextcloud’s datadir to store the files in a different location than the default docker volume. See this documentation on how to do it.

You should also think about limiting the apache container to listen only on localhost in case the reverse proxy is running on the same host and in the host network, by providing an additional environmental variable to this docker run command. See point 3.

On macOS see https://github.com/nextcloud/all-in-one#how-to-run-aio-on-macos.

Command for Windows

On Windows, install Docker Desktop (and don't forget to enable ipv6 if you should need that) and run the following command in the command prompt:

docker run ^
--init ^
--sig-proxy=false ^
--name nextcloud-aio-mastercontainer ^
--restart always ^
--publish 8080:8080 ^
--env APACHE_PORT=11000 ^
--env APACHE_IP_BINDING=0.0.0.0 ^
--volume nextcloud_aio_mastercontainer:/mnt/docker-aio-config ^
--volume //var/run/docker.sock:/var/run/docker.sock:ro ^
nextcloud/all-in-one:latest

Also, you may be interested in adjusting Nextcloud's Datadir to store the files on the host system. See this documentation on how to do it.

On Synology DSM see https://github.com/nextcloud/all-in-one#how-to-run-aio-on-synology-dsm

Inspiration for a docker-compose file

Simply translate the docker run command into a docker-compose file. You can have a look at this file for some inspiration but you will need to modify it either way. You can find further examples here: https://github.com/nextcloud/all-in-one/discussions/588

3. Limit the access to the apache container

Use this environment variable during the initial startup of the mastercontainer to make the apache container only listen on localhost: --env APACHE_IP_BINDING=127.0.0.1. Attention: This is only recommended to be set if you use localhost in your reverse proxy config to connect to your AIO instance. If you use an ip-address instead of localhost, you should set it to 0.0.0.0.

4. Open the AIO interface.

After starting AIO, you should be able to access the AIO Interface via https://ip.address.of.the.host:8080. Enter your domain that you've entered in the reverse proxy config and you should be done. Please do not forget to open/forward port 3478/TCP and 3478/UDP in your firewall/router for the Talk container!

5. Optional: get a valid certificate for the AIO interface

If you want to also access your AIO interface publicly with a valid certificate, you can add e.g. the following config to your Caddyfile:

https://<your-nc-domain>:8443 {
    reverse_proxy https://localhost:8080 {
        transport http {
            tls_insecure_skip_verify
        }
    }
}

⚠️ Please note: Look into this to adapt the above example configuration.

Afterwards should the AIO interface be accessible via https://ip.address.of.the.host:8443. You can alternatively change the domain to a different subdomain by using https://<your-alternative-domain>:443 instead of https://<your-nc-domain>:8443 in the Caddyfile and use that to access the AIO interface.

6. How to debug things?

If something does not work, follow the steps below:

1. Make sure to exactly follow the whole reverse proxy documentation step-for-step from top to bottom!
2. Make sure that you used the docker run command that is described in this reverse proxy documentation. Hint: make sure that you have set the APACHE_PORT via e.g. --env APACHE_PORT=11000 during the docker run command!
3. Make sure to set the APACHE_IP_BINDING variable correctly. If in doubt, set it to --env APACHE_IP_BINDING=0.0.0.0
4. Make sure that all ports to which your reverse proxy is pointing match the chosen APACHE_PORT.
5. Make sure to follow this to adapt the example configurations to your specific setup
6. Make sure that the mastercontainer is able to spawn other containers. You can do so by checking that the mastercontainer indeed has access to the Docker socket which might not be positioned in one of the suggested directories like /var/run/docker.sock but in a different directory, based on your OS and the way how you installed Docker. The mastercontainer logs should help figuring this out. You can have a look at them by running sudo docker logs nextcloud-aio-mastercontainer after the container is started the first time.
7. Check if after the mastercontainer was started, the reverse proxy if running inside a container, can reach the provided apache port. You can test this by running nc -z localhost 11000; echo $? from inside the reverse proxy container. If the output is 0, everything works. Alternatively you can of course use instead of localhost the ip-address of the host here for the test.
8. Make sure that you are not behind CGNAT. If that is the case, you will not be able to open ports properly. In that case you might use a Cloudflare Tunnel.
9. If you use Cloudflare, you might need to skip the domain validation anyways since it is known that Cloudflare might block the validation attempts. In that case, see the last option below.
10. If your reverse proxy is configured to use the host network (as recommended in the above docs) or running on the host, make sure that you've configured your firewall to open port 443 and 80.
11. Check if you have a public IPv4- and public IPv6-address. If you only have a public IPv6-address (e.g. due to DS-Lite), make sure to enable IPv6 in Docker and your whole networking infrastructure (e.g. also by adding an AAAA DNS-entry to your domain).
12. Try to configure everything from scratch if it still does not work by following https://github.com/nextcloud/all-in-one#how-to-properly-reset-the-instance.
13. As last resort, you may disable the domain validation by adding --env SKIP_DOMAIN_VALIDATION=true to the docker run command. But only use this if you are completely sure that you've correctly configured everything!