清漆不断丢失缓存，cookie? [英] Varnish keeps missing cache ,cookies?

问题描述

我很难让清漆正确缓存.

I have a bit of trouble getting varnish to cache correctly.

当我转到某个页面并单击刷新"时，清漆将返回缓存的页面. 但是，如果我使用另一台计算机并再次在缓存时间范围内访问同一页面，它将报告MISS.

When I go to a page and hit refresh , varnish will return the cached page. But if I use another computer and hit that same page again ( within the cache time-frame) it will report a MISS.

我使用了 http://www.unixy.net/varnish
我从(php)页面中删除了session_start()，并且不需要基于用户的cookie.
我也在使用Google Analytics(分析).

I used the cpanel varnish plugin from http://www.unixy.net/varnish
I removed session_start() from my (php) pages and I do not need userbased cookies.
I am also using google analytics.

这是我的default.vcl

This is my 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):

My headers ( on the second computer ):

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?

Can someone explain to me why this is happening and what I should change ?

谢谢！

推荐答案

这是由于Google Analytics(分析)所致.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，并避免使用其缓存.

This is because of Google Analytics. Even if your Web application does not use cookies your analytics JavaScript does. The result is the same, Varnish will pass the request to the back-end and avoid using it's cache.

要解决此问题，请在Web应用程序中定义必须使用Cookie(例如管理面板)和不使用Cookie的URL(此处您可以忽略Google Analytics(分析)的要求.大多数Web分析工具仅在浏览器之间需要Cookie)和JavaScript.)

To fix this define URLs of your Web application where you have to use cookies (e.g. administration panel) and where you don't (Here you can ignore the requirements of Google Analytics. Most Web analytics tools need cookies only between the browser and the JavaScript.).

下面您可以看到一个Varnish配置文件的示例.有趣的部分是网站的非管理部分:发送的cookie以及一些浏览器请求标头将被删除，以获取新内容.

Below you can see an example of a Varnish configuration file for this. The interesting part is that for non-administrative parts of your Web site: Sent cookies will be deleted as well as some browser request headers for fresh content.

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;
    ...
  }
  ...
}

这篇关于清漆不断丢失缓存，cookie?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！