example.conf

server {
    listen 443 ssl http2 proxy_protocol;
    include /ssl.conf.include;

    ssl_certificate /etc/nginx/certs/main.crt;
    ssl_certificate_key /etc/nginx/certs/main.key;

    server_name example.org;

    #auth_basic           "closed site";
    #auth_basic_user_file /run/secrets/default.htpasswd;

    set $upstream_endpoint app;
    location / {
        proxy_pass http://$upstream_endpoint;
    }
}

nginx.conf

user  nginx;
worker_processes  1;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    charset utf-8;

    client_max_body_size 128M;

    # oscp-stapling enabled
    # how: https://raymii.org/s/tutorials/OCSP_Stapling_on_nginx.html
    # why: https://letsencrypt.org/docs/integration-guide/
    ssl_stapling on;
    ssl_stapling_verify on;
    #resolver 8.8.8.8 8.8.4.4 valid=300s;
    resolver_timeout 5s;
    # Enable use of replicas when they change their ip.
    # For round robin, change endpoint_mode under docker deploy tag
    # 127.0.0.11 is docker swarms dns server
    resolver 127.0.0.11 valid=30s;

    # Dont log health checks
    # https://bjornjohansen.no/exclude-requests-from-nginx-access-log
    map $remote_addr $log_ip {
        "127.0.0.1" 0;
        default 1;
    }

    # If we receive X-Forwarded-Proto, pass it through; otherwise, pass along the
    # scheme used to connect to this server
    map $http_x_forwarded_proto $proxy_x_forwarded_proto {
      default $http_x_forwarded_proto;
      ''      $scheme;
    }

    # If we receive X-Forwarded-Port, pass it through; otherwise, pass along the
    # server port the client connected to
    map $http_x_forwarded_port $proxy_x_forwarded_port {
      default $http_x_forwarded_port;
      ''      $server_port;
    }

    # If we receive Upgrade, set Connection to "upgrade"; otherwise, delete any
    # Connection header that may have been passed to this server
    map $http_upgrade $proxy_connection {
      default upgrade;
      '' close;
    }

    # Set appropriate X-Forwarded-Ssl header
    map $scheme $proxy_x_forwarded_ssl {
      default off;
      https on;
    }

    # https://docs.nginx.com/nginx/admin-guide/load-balancer/tcp-udp-load-balancer/
    # https://docs.nginx.com/nginx/admin-guide/load-balancer/using-proxy-protocol/
    map $proxy_protocol_addr $real_remote_addr {
      default $proxy_protocol_addr;
      '' $remote_addr;
    }

    gzip_types text/plain text/css application/javascript application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;

    log_format vhost '[$time_local] $server_port $host $real_remote_addr - $remote_user  '
                     '"$request" $status $body_bytes_sent '
                     '"$http_referer" "$http_user_agent"';

    access_log  /var/log/nginx/access.log  vhost if=$log_ip;


    # HTTP 1.1 support
    proxy_http_version 1.1;
    proxy_buffering off;
    proxy_set_header Host $http_host;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $proxy_connection;
    proxy_set_header X-Real-IP $real_remote_addr;
    proxy_set_header X-Forwarded-For $real_remote_addr;
    proxy_set_header X-Forwarded-Proto $proxy_x_forwarded_proto;
    proxy_set_header X-Forwarded-Ssl $proxy_x_forwarded_ssl;
    proxy_set_header X-Forwarded-Port $proxy_x_forwarded_port;
    # Mitigate httpoxy attack (see README for details)
    proxy_set_header Proxy "";

    # three level subdomains for pages caused that problem
    # https://gist.github.com/muhammadghazali/6c2b8c80d5528e3118613746e0041263
    # Apply fix for very long server names
    server_names_hash_bucket_size 128;

    #sendfile        off;
    sendfile        on;
    tcp_nopush     on;
    tcp_nodelay on;

    keepalive_timeout  65;

    #gzip  on;

    include /etc/nginx/conf.d/*.conf;
}

include /etc/nginx/stream.d/*.stream;

nginx.stream

stream {

    resolver_timeout 5s;

    # Enable use of replicas when they change their ip.
    # For round robin, change endpoint_mode under docker deploy tag
    # 127.0.0.11 is docker swarms dns server
    resolver 127.0.0.11 valid=30s;

    #log_format vstream '-: $hostname : $protocol : $proxy_protocol_addr : $remote_addr : $server_addr :-';
    #access_log /var/log/nginx/access.log vstream;
    #error_log /var/log/nginx/error.log info;

    # set does not work in stream module, using map here
    map '' $upstream_endpoint {
        default proxy_nginx:443;
    }

    server {
        listen 443;
        proxy_pass $upstream_endpoint;
        proxy_protocol on;
    }
}

proxy.yml

configs:
  nginx.conf:
    external: true
    name: nginx.conf
  nginx.stream:
    external: true
    name: nginx.stream
  example.conf:
    external: true
    name: example.conf
  real_ip.conf:
    external: true
    name: real_ip.conf
  ssl.conf.include:
    external: true
    name: ssl.conf.include
services:
  nginx:
    configs:
    - source: nginx.conf
      target: /etc/nginx/nginx.conf
    - source: real_ip.conf
      target: /etc/nginx/conf.d/real_ip.conf
    - source: example.conf
      target: /etc/nginx/conf.d/example.conf
    - source: ssl.conf.include
    deploy:
      replicas: 2
      update_config:
        delay: 10s
        parallelism: 1
    image: nginx:1-alpine
  stream:
    configs:
    - source: nginx.conf
      target: /etc/nginx/nginx.conf
    - source: nginx.stream
      target: /etc/nginx/stream.d/nginx.stream
    deploy:
      mode: global
      update_config:
        delay: 10s
        parallelism: 1
    image: nginx:1-alpine
    ports:
    - mode: host
      protocol: tcp
      published: 443
      target: 443
version: '3.6'

real_ip.conf

set_real_ip_from 10.0.0.0/16;
real_ip_header proxy_protocol;

ssl.conf.include

ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers 'ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS';
ssl_prefer_server_ciphers on;
ssl_session_timeout 5m;
ssl_session_cache shared:SSL:50m;
ssl_session_tickets off;
add_header Strict-Transport-Security "max-age=31536000";
server_tokens off;