nginx_websocket.config

files:
  /etc/nginx/conf.d/proxy.conf:
    content: |
      client_max_body_size 500M;
      server_names_hash_bucket_size 128;

      upstream backend {
        server unix:///var/run/puma/my_app.sock;
      }

      server {
        listen 80;

        access_log /var/log/nginx/access.log;
        error_log /var/log/nginx/error.log;

        large_client_header_buffers 8 32k;

        location / {
          proxy_set_header X-Real-IP $remote_addr;
          proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
          proxy_set_header Host $http_host;
          proxy_set_header X-NginX-Proxy true;

          proxy_buffers 8 32k;
          proxy_buffer_size 64k;

          proxy_pass http://backend;
          proxy_redirect off;

          location /assets {
            root /var/app/current/public;
          }

          # enables WS support
          location /cable {
            proxy_pass http://backend;
            proxy_http_version 1.1;
            proxy_set_header Upgrade websocket;
            proxy_set_header Connection Upgrade;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
          }
        }
      }


container_commands:
  01restart_nginx:

Last two lines

  01_restart_nginx:
    command: "nginx -t && service nginx reload"