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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