worker_processes  4;

# Show startup logs on stderr; switch to debug to print, well, debug logs when
# running nginx-debug
error_log /dev/stderr info;

events {
  worker_connections 1024;
}

http {
  include            mime.types;
  default_type       application/octet-stream;
  sendfile           on;
  keepalive_timeout  65;
  client_max_body_size 100M;

  # Built-in Docker resolver. Needed to allow on-demand resolution of proxy
  # upstreams.
  resolver           127.0.0.11 valid=10s;

  # this is required to proxy Grafana Live WebSocket connections.
  map $http_upgrade $connection_upgrade {
    default upgrade;
   	'' close;
  }

  server {
    listen             5081 default_server;

    # using variable for upstream servers is mandatory to enfore nginx
    # to resolve the name at each query. Otherwise, proxy_pass to
    # reloaded/restarted service would fail until the nginx service it
    # restarted
    location /prometheus {
      set $upstream "http://prometheus:9090";
      proxy_pass $upstream;
    }

    location /grafana {
      set $upstream "http://grafana:3000";
      rewrite ^/grafana/(.*)$ /$1 break;
	  proxy_set_header Host $http_host;
      proxy_pass $upstream;
    }
    # Proxy Grafana Live WebSocket connections.
    location /grafana/api/live/ {
      set $upstream "http://grafana:3000";
      rewrite ^/grafana/(.*)$ /$1 break;
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection $connection_upgrade;
      proxy_set_header Host $http_host;
      proxy_pass $upstream;
    }

    location / {
      set $upstream "http://web:5004";
      proxy_pass $upstream;
      proxy_set_header Host $http_host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-Host $http_host;
      proxy_redirect off;
    }
  }
}