varnish实现缓存加速

varnish实现缓存加速

一、采用varnish为nginx实现缓存加速
1、实验环境:
(1)一台varnish缓存服务器,一台nginx服务器
(2)关闭防火墙和selinux
2.配置varnish
(1)修改varnish配置文件:

创建目录:mkdir -pv /data/varnish/cache
修改属主:chown varnish.varnish /data/varnish/cache

(2)测试：


二、varnish实现动静分离
(1)varnish配置:

(2)测试:


(3)附件内容设置多个组，并做负载:

示例：
    import directors

    backend imgsrv1 {
        .host = "192.168.10.11";
        .port = "80";
    }

    backend imgsrv2 {
        .host = "192.168.10.12";
        .port = "80";
    }   

    backend appsrv1 {
        .host = "192.168.10.21"; .port = "80"; } backend appsrv2 { .host = "192.168.10.22"; .port = "80"; } sub vcl_init { new imgsrvs = directors.random(); imgsrvs.add_backend(imgsrv1,10); imgsrvs.add_backend(imgsrv2,20); new staticsrvs = directors.round_robin(); appsrvs.add_backend(appsrv1); appsrvs.add_backend(appsrv2); new appsrvs = directors.hash(); appsrvs.add_backend(appsrv1,1); appsrvs.add_backend(appsrv2,1); } sub vcl_recv { if (req.url ~ "(?i)\.(css|js)$" { set req.backend_hint = staticsrvs.backend(); } if (req.url ~ "(?i)\.(jpg|jpeg|png|gif)$" { set req.backend_hint = imgsrvs.backend(); } else { set req.backend_hint = appsrvs.backend(req.http.cookie); } } 

安全检测:

.probe：定义健康状态检测方法；
                .url：检测时要请求的URL，默认为”/"; 
                  .request：发出的具体请求；
                    .request = 
                        "GET /.healthtest.html HTTP/1.1"
                        "Host: www.ww.com"
                        "Connection: close" .window：基于最近的多少次检查来判断其健康状态； .threshold：最近.window中定义的这么次检查中至有.threshhold定义的次数是成功的；成功阈值； .interval：检测频度； .timeout：超时时长； .expected_response：期望的响应码，默认为200； 健康状态检测的配置方式： probe PB_NAME { } backend NAME = { .probe = PB_NAME; ... }