Deploy a reverse proxy doing PROXY Protocol

This is needed to be able to nicely host multiple services under a
single IPv4.
The reverse proxy also includes a configuration to pass requests for
acme challenge properly.
And lastly the reverse proxy is already configured for a stirling pdf,
which gets added once the DNS record for it is in place.

docker_compose_applications/reverse-proxy/compose.yaml

@@ -0,0 +1,12 @@
+# Links & Resources
+# - https://hub.docker.com/_/nginx
+
+services:
+  caddy:
+    image: nginx
+    ports:
+      - "80:80"
+      - "443:443"
+    volumes:
+      - "./nginx.conf:/etc/nginx/nginx.conf:ro"
+      - "./conf.d/:/etc/nginx/conf.d/:ro"

docker_compose_applications/reverse-proxy/conf.d/acme_challenge.conf

@@ -0,0 +1,23 @@
+map $host $upstream_acme_challenge_host {
+    pdf.consider-it.de 127.0.0.1:8000;
+    default "";
+}
+
+server {
+    listen 80 default_server;
+
+    location /.well-known/acme-challenge/ {
+        proxy_pass http://$upstream_acme_challenge_host;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        # This is http in any case.
+        proxy_set_header X-Forwarded-Proto http;
+    }
+
+    # Better safe than sorry.
+    # Don't do a permanent redirect to avoid acme challenge pain.
+    location / {
+        return 307 https://$host$request_uri;
+    }
+}

docker_compose_applications/reverse-proxy/nginx.conf

@@ -0,0 +1,50 @@
+# Modified nginx.conf from nginx Docker container from 2024-02-07, via the
+# following command:
+# docker run --rm --pull=always --entrypoint=cat nginx /etc/nginx/nginx.conf > ./nginx.conf
+
+user  nginx;
+worker_processes  auto;
+
+error_log  /var/log/nginx/error.log notice;
+pid        /var/run/nginx.pid;
+
+
+events {
+    worker_connections  1024;
+}
+
+# Listen on port 443 as a reverse proxy and use PROXY Protocol for the
+# upstreams.
+stream {
+    map $ssl_preread_server_name $address {
+        pdf.consider-it.de 127.0.0.1:44300;
+    }
+
+    server {
+        listen 0.0.0.0:443;
+        listen [::]:443;
+        proxy_pass $address;
+        ssl_preread on;
+        proxy_protocol on;
+    }
+}
+
+http {
+    include       /etc/nginx/mime.types;
+    default_type  application/octet-stream;
+
+    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
+                      '$status $body_bytes_sent "$http_referer" '
+                      '"$http_user_agent" "$http_x_forwarded_for"';
+
+    access_log  /var/log/nginx/access.log  main;
+
+    sendfile        on;
+    #tcp_nopush     on;
+
+    keepalive_timeout  65;
+
+    #gzip  on;
+
+    include /etc/nginx/conf.d/*.conf;
+}

inventories/hetzner/host_vars/cit-docker-host.yaml

@@ -1 +1,3 @@
-docker_compose__projects: [ ]
+docker_compose__projects:
+  - name: reverse-proxy
+    files_directory: ../docker_compose_applications/reverse-proxy