[英]Varnish: how to separately cache pages based on value of a specific cookie
我管理的网站只有一个cookie,我们必须使用它,但总是9个值之一(包括没有值)。 我想在我们的应用程序服务器前面使用清漆,varnish根据cookie值分别缓存每个页面的版本。
因此,如果我们有page / page1,Varnish应该单独管理/ page1与cookie值a,b,c,d等相似的副本....
假设我们在Varnish服务器上有足够的内存来处理存储所有cookie组合的所有页面。
我们已经尝试了很多VCL设置,但无法弄清楚如何使其工作。 Varnish也需要将特定的cookie发送到我们的应用服务器,因此我们的应用程序知道要发回哪些内容。
提前致谢!
实现起来很简单,实际上,你应该添加一个自定义的vcl_hash
:
sub vcl_hash {
#...
/* Hash cookie data */
# As requests with same URL and host can produce diferent results when issued with different cookies,
# we need to store items hashed with the associated cookies. Note that cookies are already sanitized when we reach this point.
if (req.http.Cookie) {
/* Include cookie in cache hash */
hash_data(req.http.Cookie);
}
#...
}
使用此代码,清漆将为每个cookie值存储不同的cookie ...但我建议您还要在vcl_recv
上清理您的cookie,这是[1]的摘录,其中包含针对Drupal站点的cookie清理:
sub vcl_recv {
#...
# Remove all cookies that backend doesn't need to know about.
# See https://www.varnish-cache.org/trac/wiki/VCLExampleRemovingSomeCookies
if (req.http.Cookie) {
/* Warning: Not a pretty solution */
/* Prefix header containing cookies with ';' */
set req.http.Cookie = ";" + req.http.Cookie;
/* Remove any spaces after ';' in header containing cookies */
set req.http.Cookie = regsuball(req.http.Cookie, "; +", ";");
/* Prefix cookies we want to preserve with one space */
/* 'S{1,2}ESS[a-z0-9]+' is the regular expression matching a Drupal session cookie ({1,2} added for HTTPS support) */
/* 'NO_CACHE' is usually set after a POST request to make sure issuing user see the results of his post */
/* Keep in mind we should add here any cookie that should reach the backend such as splahs avoiding cookies */
set req.http.Cookie = regsuball(req.http.Cookie, ";(S{1,2}ESS[a-z0-9]+|NO_CACHE|OATMEAL|CHOCOLATECHIP)=", "; \1=");
/* Remove from the header any single Cookie not prefixed with a space until next ';' separator */
set req.http.Cookie = regsuball(req.http.Cookie, ";[^ ][^;]*", "");
/* Remove any '; ' at the start or the end of the header */
set req.http.Cookie = regsuball(req.http.Cookie, "^[; ]+|[; ]+$", "");
if (req.http.Cookie == "") {
/* If there are no remaining cookies, remove the cookie header. */
unset req.http.Cookie;
}
}
#...
return(hash);
#...
}
[1] https://github.com/NITEMAN/varnish-bites/blob/master/varnish3/drupal-base.vcl
NITEMAN为这个问题最初提出时提供了一个很好的答案。 然而,介入的时间跨度导致了官方支持的VMOD,使得过滤不需要的cookie更容易和更清洁。 它可以在以下网址找到: https : //github.com/varnish/varnish-modules
从README中的示例(略微调整):
import cookie;
sub vcl_recv {
cookie.parse(req.http.cookie);
cookie.filter_except("SESSIONID,PHPSESSID");
set req.http.cookie = cookie.get_string();
# Only SESSIONID and PHPSESSID are left in req.http.cookie at this point.
# ...
return (hash);
# ...
}
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