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nginx怎麼實現多geoserver服務的負載平衡

PHPz

發布： 2023-05-17 11:04:05

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概述

為了提高服務的存取速度，減輕geoserver服務的壓力，同時避免服務節點出現問題而影響服務存取的穩定性，我們通常會透過部署多個geoserver來解決，但部署了多個geoserver後，我們需要一個統一的介面提供出來供使用，nginx很好地可以這樣的需求，本文講講如何透過nginx實現多geoserver服務的負載平衡。

實作效果

nginx怎麼實現多geoserver服務的負載平衡

實作

1. 多geoserver部署

為了保持geoserver的服務一致，我們先配置一個geoserver服務，配置好之後將部署的Tomcat複製，克隆多個出來，本文為演示複製了兩個（共三個geoserver），修改Tomcat的端口，使三個端口不衝突，複製好之後分別啟動三個Tomcat。

2. nginx配置

修改nginx.conf文件，設定資訊如下：

#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  &#39;$remote_addr - $remote_user [$time_local] "$request" &#39;
    #                  &#39;$status $body_bytes_sent "$http_referer" &#39;
    #                  &#39;"$http_user_agent" "$http_x_forwarded_for"&#39;;

    #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 &#39;Access-Control-Allow-Origin&#39; $http_origin;
            add_header &#39;Access-Control-Allow-Credentials&#39; &#39;true&#39;;
            add_header &#39;Access-Control-Allow-Methods&#39; &#39;GET, POST, OPTIONS&#39;;
            add_header &#39;Access-Control-Allow-Headers&#39; &#39;DNT,web-token,app-token,Authorization,Accept,Origin,Keep-Alive,User-Agent,X-Mx-ReqToken,X-Data-Type,X-Auth-Token,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range&#39;;
            add_header &#39;Access-Control-Expose-Headers&#39; &#39;Content-Length,Content-Range&#39;;
            if ($request_method = &#39;OPTIONS&#39;) {
                add_header &#39;Access-Control-Max-Age&#39; 1728000;
                add_header &#39;Content-Type&#39; &#39;text/plain; charset=utf-8&#39;;
                add_header &#39;Content-Length&#39; 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;
        }
    }
}

登入後複製

設定好nginx後，啟動nginx。

3. 前端呼叫

根據上述的配置，nginx的連接埠為80，因此geoserver的位址為http://localhost/geoserver,在ol中的呼叫程式碼如下：

<!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>

登入後複製

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