5

我在正确缓存清漆时遇到了一些麻烦。

当我转到一个页面并点击 refresh 时，varnish 将返回缓存的页面。但是，如果我使用另一台计算机并再次访问同一页面（在缓存时间范围内），它将报告 MISS。

我使用了来自http://www.unixy.net/varnish的 cpanel varnish 插件
我从我的 (php) 页面中删除了 session_start() 并且我不需要基于用户的 cookie。
我也在使用谷歌分析。

这是我的 default.vcl

###################################################
# Copyright (c) UNIXY  -  http://www.unixy.net    #
# The leading truly fully managed server provider #
###################################################

include "/etc/varnish/cpanel.backend.vcl";

include "/etc/varnish/backends.vcl";

sub vcl_recv {

# Use the default backend for all other requests
set req.backend = default;

# Setup the different backends logic
include "/etc/varnish/acllogic.vcl";

# Allow a grace period for offering "stale" data in case backend lags
set req.grace = 5m;

remove req.http.X-Forwarded-For;
set req.http.X-Forwarded-For = client.ip;

# cPanel URLs
include "/etc/varnish/cpanel.url.vcl";

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

# Set up disabled
include "/etc/varnish/disabled.vcl";

# Exclude upgrade, install, server-status, etc
include "/etc/varnish/known.exclude.vcl";

# Set up exceptions
include "/etc/varnish/url.exclude.vcl";

# Set up exceptions
include "/etc/varnish/vhost.exclude.vcl";

# Set up vhost+url exceptions
include "/etc/varnish/vhosturl.exclude.vcl";

# Set up cPanel reseller exceptions
include "/etc/varnish/reseller.exclude.vcl";

# Restart rule for bfile recv
include "/etc/varnish/bigfile.recv.vcl";


if (req.request == "PURGE") {
        if (!client.ip ~ acl127_0_0_1) {error 405 "Not permitted";}
        return (lookup);
}

## Default request checks
if (req.request != "GET" &&
req.request != "HEAD" &&
req.request != "PUT" &&
req.request != "POST" &&
req.request != "TRACE" &&
req.request != "OPTIONS" &&
req.request != "DELETE") {
    return (pipe);
}

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

## Modified from default to allow caching if cookies are set, but not http auth
if (req.http.Authorization) {
    return (pass);
}

include "/etc/varnish/versioning.static.vcl";

## Remove has_js and Google Analytics cookies.
set req.http.Cookie = regsuball(req.http.Cookie, "(^|;\s*)(__[a-z]+|has_js)=[^;]*", "");

set req.http.Cookie = regsub(req.http.Cookie, "^;\s*", "");



if (req.http.Cookie ~ "^\s*$") {
    unset req.http.Cookie;
}

include "/etc/varnish/slashdot.recv.vcl";

# Cache things with these extensions
if (req.url ~ "\.(js|css|jpg|jpeg|png|gif|gz|tgz|bz2|tbz|mp3|ogg|swf|pdf)$" && ! (req.url ~ "\.(php)") ) {
    unset req.http.Cookie;
    return (lookup);
}

return (lookup);
}

sub vcl_fetch {

set beresp.ttl = 40s;
set beresp.http.Server = " - Web acceleration by http://www.unixy.net/varnish ";

# Turn off Varnish gzip processing
include "/etc/varnish/gzip.off.vcl";

# Grace to allow varnish to serve content if backend is lagged
set beresp.grace = 5m;

# Restart rule bfile for fetch
include "/etc/varnish/bigfile.fetch.vcl";

# These status codes should always pass through and never cache.
if (beresp.status == 503 || beresp.status == 500) {
    set beresp.http.X-Cacheable = "NO: beresp.status";
    set beresp.http.X-Cacheable-status = beresp.status;
    return (hit_for_pass);
}

if (beresp.status == 404) {
    set beresp.http.magicmarker = "1";
    set beresp.http.X-Cacheable = "YES";
    set beresp.ttl = 20s;
    return (deliver);
}

/* Remove Expires from backend, it's not long enough */    
unset beresp.http.expires;

if (req.url ~ "\.(js|css|jpg|jpeg|png|gif|gz|tgz|bz2|tbz|mp3|ogg|swf|pdf|ico)$" && ! (req.url ~ "\.(php)") ) {
    unset beresp.http.set-cookie;
    include "/etc/varnish/static.ttl.vcl";
}
include "/etc/varnish/slashdot.fetch.vcl"; 
else {
    include "/etc/varnish/dynamic.ttl.vcl";
}

/* marker for vcl_deliver to reset Age: */
set beresp.http.magicmarker = "1";

# All tests passed, therefore item is cacheable
set beresp.http.X-Cacheable = "YES";

return (deliver);
}

sub vcl_deliver {

  # From http://varnish-cache.org/wiki/VCLExampleLongerCaching
  if (resp.http.magicmarker) {
     /* Remove the magic marker */
     unset resp.http.magicmarker;

     /* By definition we have a fresh object */
     set resp.http.age = "0";
   }

   #add cache hit data
   if (obj.hits > 0) {
     #if hit add hit count
     set resp.http.X-Cache = "HIT";
     set resp.http.X-Cache-Hits = obj.hits;
   }
else {
     set resp.http.X-Cache = "MISS";
   }

}

sub vcl_error {

if (obj.status == 503 && req.restarts < 5) {
set obj.http.X-Restarts = req.restarts;
return (restart);
}

}

# Added to let users force refresh
sub vcl_hit {

if (obj.ttl < 1s) {
    return (pass);
}

if (req.http.Cache-Control ~ "no-cache") {
# Ignore requests via proxy caches,  IE users and badly behaved crawlers
# like msnbot that send no-cache with every request.
if (! (req.http.Via || req.http.User-Agent ~ "bot|MSIE|HostTracker")) {
    set obj.ttl = 0s;
    return (restart);
} 
}

return (deliver);

}

sub vcl_hash {

    hash_data(req.http.cookie);
}

我的标题（在第二台计算机上）： 

http://www.subtitleseeker.com/

GET / HTTP/1.1
Host: www.subtitleseeker.com
User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:11.0) Gecko/20100101 Firefox/11.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive
Referer: http://www.subtitleseeker.com/search/
Cookie: __utma=107027200.157820436.1334670333.1334670333.1334670333.1; __utmb=107027200.51.10.1334670333; __utmz=107027200.1334670333.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); __utmc=107027200; __unam=4ca9c7b-136c095f22c-1396bc94-1

HTTP/1.1 200 OK
X-Powered-By: PHP/5.3.8
Vary: User-Agent,Accept-Encoding
Content-Encoding: gzip
Content-Type: text/html
Server: - Web acceleration by http://www.unixy.net/varnish
X-Cacheable: YES
Content-Length: 8169
Accept-Ranges: bytes
Date: Tue, 17 Apr 2012 14:10:12 GMT
X-Varnish: 916645159
Via: 1.1 varnish
Connection: keep-alive
Age: 0
X-Cache: MISS

有人可以向我解释为什么会发生这种情况以及我应该改变什么吗？

谢谢 ！

4

2 回答 2

2

这是因为谷歌分析。即使您的 Web 应用程序不使用 cookie，您的分析 JavaScript 也会使用。结果是一样的，Varnish 会将请求传递给后端并避免使用它的缓存。

要解决此问题，请定义您的 Web 应用程序的 URL，您必须使用 cookie（例如管理面板）和不使用的位置（在这里您可以忽略 Google Analytics 的要求。大多数 Web 分析工具只需要浏览器和 JavaScript 之间的 cookie .)。

下面你可以看到一个 Varnish 配置文件的例子。有趣的是，对于您网站的非管理部分：发送的 cookie 以及一些新内容的浏览器请求标头将被删除。

sub vcl_recv {
  # regex to find all URLs where cookies are required
  if (req.url ~ "^/admin/") {
    # administration panel
    set req.http.admin = 1;
  } else {
    # public web site, ignore client request for fresh content, remove cookies
    unset req.http.Cache-Control;
    unset req.http.Max-Age;
    unset req.http.Pragma;
    unset req.http.Cookie;
  }
  ...
}

sub vcl_fetch {
  if (req.http.admin == 1) {
    # administration panel
    return (hit_for_pass);
  } else {
    # public web site, not allowed to set cookies
    unset beresp.http.Set-Cookie;
    ...
  }
  ...
}
于 2012-04-17T15:03:15.663 回答
1

您可以使用varnishlog命令行工具来观察 Varnish 在处理每个请求时正在做什么。例如，您可以查看是否有任何 cookie 正在分裂。

我有一种感觉，可能是另一台计算机上的用户代理略有不同。Varnish 将这个值包含在 key 中（如果知道的话）。我们的规则vcl_recv是：

set req.http.User-Agent = "";

这为我们解决了类似的问题。

于 2012-06-12T08:27:29.767 回答