Operation and Maintenance
Nginx
How nginx implements load balancing of multiple geoserver services
How nginx implements load balancing of multiple geoserver services
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
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: '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>The above is the detailed content of How nginx implements load balancing of multiple geoserver services. For more information, please follow other related articles on the PHP Chinese website!
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