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How nginx implements load balancing of multiple geoserver services

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2023-05-17 11:04:051449browse

Overview

In order to improve the access speed of the service, reduce the pressure on the geoserver service, and avoid problems with service nodes that affect the stability of service access, we usually solve the problem by deploying multiple geoservers, but deploying After installing multiple geoservers, we need a unified interface for use. nginx can meet such needs very well. This article talks about how to achieve load balancing of multiple geoserver services through nginx.

Implementation effect

How nginx implements load balancing of multiple geoserver services

Implementation

1. Multiple geoserver deployment

In order to keep the geoserver service consistent, we first Configure a geoserver service. After configuring, copy the deployed Tomcat and clone multiple ones. This article copied two (three geoservers in total) for demonstration. Modify the Tomcat port so that the three ports do not conflict. After copying, respectively Start three Tomcats.

2. nginx configuration

Modify the nginx.conf file, the configuration information is as follows: 

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       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  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;
    
    # 反向代理配置
    upstream server_list{
       # 这个是tomcat的访问路径
       server localhost:8081;
       server localhost:8082;
       server localhost:8083;
    }
    server {
        listen       80;
        server_name  localhost;
     
        location / {
            add_header 'Access-Control-Allow-Origin' $http_origin;
            add_header 'Access-Control-Allow-Credentials' 'true';
            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'DNT,web-token,app-token,Authorization,Accept,Origin,Keep-Alive,User-Agent,X-Mx-ReqToken,X-Data-Type,X-Auth-Token,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
            add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
            if ($request_method = 'OPTIONS') {
                add_header 'Access-Control-Max-Age' 1728000;
                add_header 'Content-Type' 'text/plain; charset=utf-8';
                add_header 'Content-Length' 0;
                return 204;
            }
            root   html;
            proxy_pass http://server_list;
            index  index.html index.htm;
        }
        
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }
}

After configuring nginx, start nginx.

3. Front-end call

According to the above configuration, the port of nginx is 80, so the address of geoserver is http://localhost/geoserver. The calling code in ol is as follows: 

<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>OpenLayers map preview</title>
  <link rel="stylesheet" href="lib/ol/ol.css" rel="external nofollow"  type="text/css">
  <link rel="stylesheet" href="css/common.css" rel="external nofollow" >
  <script src="../ol5/ol.js" type="text/javascript"></script>
</head>
<body>
<div id="map" class="map"></div>
<script>
  const options = {
    center: [52102781.07568731, 4456849.777083951],
    zoom: 3,
    minZoom: 0,
    maxZoom: 18
  }

  const base = new ol.layer.Tile({
    visible: true,
    source: new ol.source.OSM()
  });
  const wms = new ol.layer.Tile({
    source: new ol.source.TileWMS({
      url: &#39;http://localhost/geoserver/mapbox/wms&#39;,
      params: {&#39;LAYERS&#39;: &#39;mapbox:city&#39;, &#39;TILED&#39;: true},
      serverType: &#39;geoserver&#39;,
      transition: 0
    })
  })

  window.map = new ol.Map({
    controls: ol.control.defaults({
      attribution: false
    }).extend([new ol.control.ScaleLine()]),
    target: &#39;map&#39;,
    layers: [base, wms],
    view: new ol.View({
      center: options.center,
      zoom: options.zoom,
      minZoom: options.minZoom,
      maxZoom: options.maxZoom
    })
  });
</script>
</body>
</html>

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