Varnish忽略ttl

Question

我有一个问题，我找不到它的来源。

我在一个带有Nginx的专用服务器上使用Varnish Cache，并将网站重定向到它们的后端。

每件事都像一个魔力期望的东西，所有的页面都被缓存了2分钟，即使我为每个页面定义了不同的ttl，定义的ttl被忽略或绕过了，或者其他什么。

下面是我的配置：

/etc/varnish/vcl_backend_response：

#example.com:
if (beresp.http.host == "example.com" || beresp.http.host == "www.example.com" ) {
include "/etc/varnish/backend_response/example.conf";
}
return(deliver);

        set beresp.http.Vary = "Accept-Encoding";
        set beresp.ttl = 1h;

        if (beresp.ttl <= 0s ||
                beresp.http.Set-Cookie ||
                beresp.http.Vary == "*") {
                set beresp.ttl = 120 s;
                set beresp.uncacheable = true;
                return (deliver);
        }

        unset beresp.http.Server;
        set beresp.http.Server = "Microsoft IIS/7.5";

    if (beresp.http.content-type ~ "text") {
        set beresp.do_gzip = true;
    }

    if (bereq.http.X-UA-Device) {
        if (!beresp.http.Vary) { # no Vary at all
            set beresp.http.Vary = "X-UA-Device";
        } elseif (beresp.http.Vary !~ "X-UA-Device") { # add to existing Vary
            set beresp.http.Vary = beresp.http.Vary + ", X-UA-Device";
        }
    }
        set beresp.http.X-UA-Device = bereq.http.X-UA-Device;
        set beresp.grace = 2h;

}

/etc/varnish/backend_response/example.conf

if (bereq.url ~ "(?i)\.(css|bmp|tif|ttf|docx|woff2|js|pict|tiff|eot|xlsx|jpg|csv|eps|woff|xls|jpeg|doc|ejs|otf|pptx|gif|pdf|swf|svg|ps|ico|pls|midi|svgz|class|png|ppt|mid|webp|jar)(\?[a-zA-Z0-9\=\.\-]+)?$") {
        set beresp.ttl = 4h;
        unset beresp.http.expires;
        set beresp.http.cache-control = "max-age=345600";
        set beresp.http.magicmarker = "1";
        set beresp.grace = 300m;
        set beresp.do_gzip = true;
} elseif(bereq.url == "/" ) {
        set beresp.ttl = 1m;
        set beresp.grace = 300m;
        set beresp.do_gzip = true;
} else {
        set beresp.ttl = 5m;
        set beresp.grace = 300m;
        set beresp.do_gzip = true;
}

首页被缓存了1m，其余页面被缓存了5m，但由于未知的原因，所有页面都被缓存了200万。

/etc/varnish/vcl_recv.conf：

sub vcl_recv {

#exmaple.com:
        if (req.http.host == "exmaple.com" || req.http.host == "www.exmaple.com" ) {
                set req.backend_hint = exmaple;
                include "/etc/varnish/recv/exmaple.conf";
        }

include "/etc/varnish/recv/global.conf";
    unset req.http.cookie;
    unset req.http.Accept-Encoding;

call identify_device;

        if (req.method != "GET" && req.method != "HEAD") {
                return (pass);
        }

        if (req.http.Authorization || req.http.Cookie) {
                return (pass);
        }

        if (req.http.Accept-Encoding) {
                if (req.url ~ "\.(jpg|png|gif|gz|tgz|bz2|tbz|mp3|ogg)$") {
                        unset req.http.Accept-Encoding;
                } elseif (req.http.Accept-Encoding ~ "gzip") {
                        set req.http.Accept-Encoding = "gzip";
                } elsif (req.http.Accept-Encoding ~ "deflate") {
                        set req.http.Accept-Encoding = "deflate";
                } else {
                        unset req.http.Accept-Encoding;
                }
        }

        if (req.http.Cookie) {
                set req.http.Cookie = regsuball(req.http.Cookie, "(^|(?<=; )) *__utm.=[^;]+;? *", "\1");

                if (req.http.Cookie == "PHPSESSID|LOGIN") {
                        unset req.http.Cookie;
                }
        }

}

/etc/varnish/recv/exmaple.conf：

if (req.http.x-forwarded-for) {
        set req.http.X-Forwarded-For = req.http.X-Forwarded-For;
} else {
        set req.http.X-Forwarded-For = client.ip;
}
if (req.method != "GET" && req.method != "HEAD") {
        return(pass);
}
if (req.url ~ "(?i)\.(css|bmp|tif|ttf|docx|woff2|js|pict|tiff|eot|xlsx|jpg|csv|eps|woff|xls|jpeg|doc|ejs|otf|pptx|gif|pdf|swf|svg|ps|ico|pls|midi|svgz|class|png|ppt|mid|webp|jar)(\?[a-zA-Z0-9\=\.\-]+)?$") {
        unset req.http.cookie;
        return (hash);
} elseif (req.url ~ "/custom-page") {
        return (pass);
} elseif (req.url == "/" ) {
        return (hash);
} else {
        return (hash);
}

有什么线索吗？

提前谢谢。

Answer 1

您的代码总是进入这个if块，因此将ttl设置为120s。一定要检查这3个条件中哪一个或多个的计算结果为真(通过逐个删除if条件中的它们)

  if (beresp.ttl <= 0s ||
                beresp.http.Set-Cookie ||
                beresp.http.Vary == "*") {
                set beresp.ttl = 120 s; 
                set beresp.uncacheable = true;
                return (deliver);
        }