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实现静态文件压缩

Varnish itself does not compress or decompress objects, although that has been on our wish list for quite a while. However, it will operate correctly with backends that support compression.

从官方网站可以得知，Varnish本身并不能提供压缩的功能，但是我们又想要使用压缩，该怎么处理呢？（有关压缩的方面可以参考官方网站）

在vcl_recv中加入如下配置，为Varnish指定压缩算法，提高效率。（Even though there are few possible values for Accept-Encoding, Varnish treats them literally rather than semantically, so even a small difference which makes no difference to the backend can reduce cache efficiency by making Varnish cache too many different versions of an object.）

        if (req.http.Accept-Encoding) {

                if (req.url ~ "\.(jpg|png|gif|gz|tgz|bz2|tbz|mp3|ogg)$") {                 # No point in compressing these                 remove req.http.Accept-Encoding;                 } else if (req.http.Accept-Encoding ~ "gzip") {                         set req.http.Accept-Encoding = "gzip";                 } else if (req.http.Accept-Encoding ~ "deflate") {                         set req.http.Accept-Encoding = "deflate";                 } else {                         # unkown algorithm                         remove req.http.Accept-Encoding;                 }         }

在vcl_hash中

sub vcl_hash {

        set req.hash += req.url;         if (req.http.Accept-Encoding ~ "gzip") {                 set req.hash += "gzip";         }         else if (req.http.Accept-Encoding ~ "deflate") {                 set req.hash += "deflate";         }         hash; }

这样就把压缩的工作还是交给后端服务器去做

添加一个Header标识是否命中

sub vcl_deliver {        if (obj.hits > 0) {                set resp.http.X-Cache = "HIT";        } else {                set resp.http.X-Cache = "MISS";        }}

对特定URL进行IP访问限制

如果我们对某些特定的URL只想某些IP能访问，又该怎么办呢？

首先定义允许访问的IP列表

acl permit {

        "10.1.1.5";         "10.0.2.5";         "10.10.1.3"; }

然后是针对URL进行访问控制

                if (req.url ~ "/test/.*" && !client.ip ~ permit) {

                        error 403 "Not Allowed.";                 }

对特定URL不缓存

sub vcl_fetch {

    if (req.request == "GET" && req.url ~ "/test/.*") {         set obj.ttl = 0s;     }     else {         set obj.ttl = 1800s;     }    #set    obj.http.X-Varnish-IP = server.ip;     set    obj.http.Varnish = "Tested by Kevin";     insert; }

清除指定缓存内容

我们可以通过varnishadm这个命令从管理端口进行指定缓存的清除

/usr/varnish/bin/varnishadm -T 127.0.0.1:3500 url.purge /test/*

/usr/varnish/bin/varnishadm -T 127.0.0.1:3500 url.purge *$ (清除所有缓存)

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