nginx中http-sysguard模块_ar

一、作用

防止因nginx并发访问量过高或者遭受攻击造成服务器宕机，可根据负载设置界面跳转。

二、安装配置

1.下载模块软件包

wget https://github.com/alibaba/nginx-http-sysguard/archive/master.zip
unzip /opt/master.zip

2.给nginx打nginx_sysguard补丁

cd /nginx源文件目录
patch -p1 < nginx-http-sysguard-master/nginx_sysguard_1.3.9.patch

3.编译nginx添加模块

nginx -v查看nginx编译选项

[root@myhost nginx-1.14.0]# nginx -v
nginx version: nginx/1.14.0
built by gcc 4.8.5 20150623 (red hat 4.8.5-36) (gcc) 
built with openssl 1.0.2o  27 mar 2018
tls sni support enabled
configure arguments: --user=www --group=www --prefix=/usr/local/nginx --with-http_stub_status_module --with-http_ssl_module --with-http_v2_module --with-http_gzip_static_module --with-http_sub_module --with-stream --with-stream_ssl_module --with-openssl=/opt/hdlnmp/src/openssl-1.0.2o

重新编译,增加模块

./configure --user=www --group=www --prefix=/usr/local/nginx --with-http_stub_status_module --with-http_ssl_module --with-http_v2_module --with-http_gzip_static_module --with-http_sub_module --with-stream --with-stream_ssl_module --with-openssl=/opt/hdlnmp/src/openssl-1.0.2o --add-module=nginx-http-sysguard-master
make

替换nginx可执行程序

cp /usr/local/nginx/sbin/nginx /usr/local/nginx/sbin/nginx.bak
cp ./objs/nginx /usr/local/nginx/sbin/

4.配置nginx文件

添加如下内容，可在http、server、location段配置，load值根据实际需求自行调节。

        sysguard on;
        sysguard_load load=0.01 action=/loadlimit;
        sysguard_mem swapratio=20% action=/swaplimit;
        location = /loadlimit {
            return 503;
        }
        location /swaplimit {
            return 503;
        }

可修改配置页面跳转

        sysguard on;
        sysguard_load load=0.01 action=/crowded.html;
        #sysguard_load load=0.01 action=/error_page/index.html;

5.重启nginx

service nginx restart

crowded.html（放到项目根目录）

<!doctype html>
<html>

	<head>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0" />
		<meta http-equiv="x-ua-compatible" content="ie=edge" />
		<title>国家海洋博物馆</title>
		<style type="text/css">
			.box {
				position: fixed;
				top: 50%;
				left: 50%;
				transform: translate(-50%, -50%);
				-ms-transform: translate(-50%, -50%);
				/* ie 9 */
				-webkit-transform: translate(-50%, -50%);
				/* safari and chrome */
				-o-transform: translate(-50%, -50%);
				/* opera */
				-moz-transform: translate(-50%, -50%);
				/* firefox */
			}
			
			.box img {
				display: block;
				width: 3.85rem;
			}
			
			.box p {
				font-size: 0.28rem;
				color: #000;
				text-align: center;
				line-height: 1.5rem;
			}
		</style>
	</head>

	<body>
		<div class="box">
			<img src="https://img-blog.csdnimg.cn/2022010617585034894.jpeg" />
			<p>太热情了，请稍后再来吧</p>
		</div>
		<script type="text/javascript">
			(function(doc, win) {
				var docel = doc.documentelement,
					resizeevt = 'orientationchange' in window ? 'orientationchange' : 'resize',
					recalc = function() {
						var clientwidth = docel.clientwidth;
						if(!clientwidth) return;
						if(clientwidth >= 750) {
							docel.style.fontsize = '100px';
						} else {
							docel.style.fontsize = 100 * (clientwidth / 750) + 'px';
						}
					};

				if(!doc.addeventlistener) return;
				win.addeventlistener(resizeevt, recalc, false);
				doc.addeventlistener('domcontentloaded', recalc, false);
			})(document, window)
		</script>
	</body>

</html>

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