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;

                    ...

                     }