概述
为了提高服务的访问速度，减轻geoserver服务的压力，同时避免服务节点出现问题而影响服务访问的稳定性，我们通常会通过部署多个geoserver来解决，但是部署了多个geoserver后，我们需要一个统一的接口提供出来供使用，nginx很好地可以这样的需求，本文讲讲如何通过nginx实现多geoserver服务的负载均衡。
实现效果
实现
1. 多geoserver部署
为了保持geoserver的服务一致，我们先配置好一个geoserver服务，配置好之后将部署的Tomcat复制，克隆多个出来，本文为演示复制了两个（共三个geoserver），修改Tomcat的端口，使三个端口不冲突，复制好之后分别启动三个Tomcat。
2. nginx配置
修改nginx.conf文件，配置信息如下：
#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 '$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;
}
}
}配置好nginx后，启动nginx。
3. 前端调用
根据上述的配置，nginx的端口为80，因此geoserver的地址为http://localhost/geoserver,在ol中的调用代码如下：
<!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: 'http://localhost/geoserver/mapbox/wms',
params: {'LAYERS': 'mapbox:city', 'TILED': true},
serverType: 'geoserver',
transition: 0
})
})
window.map = new ol.Map({
controls: ol.control.defaults({
attribution: false
}).extend([new ol.control.ScaleLine()]),
target: 'map',
layers: [base, wms],
view: new ol.View({
center: options.center,
zoom: options.zoom,
minZoom: options.minZoom,
maxZoom: options.maxZoom
})
});
</script>
</body>
</html>到此这篇关于nginx实现多geoserver服务的负载均衡的示例代码的文章就介绍到这了,更多相关nginx 多geoserver负载均衡内容请搜索编程网以前的文章或继续浏览下面的相关文章希望大家以后多多支持编程网！
