我想为
Rubygems设置缓存服务器,因为我目前在越南,而国际互联网连接速度很慢.我一直试图通过Varnish完成这项工作,但经过数小时的谷歌搜索和尝试各种各样的事情,我仍然卡住了,无法让它正常工作.
我的目标
这是我安装gem时的示例请求组:
GET http://api.rubygems.org/latest_specs.4.8.gz 302 Moved Temporarily GET http://s3.amazonaws.com/production.s3.rubygems.org/latest_specs.4.8.gz 200 OK
我想设置一个反向代理缓存服务器(例如rubygems.mydomain.com),我可以在其中执行以下请求,缓存服务器将在内部跟踪任何重定向.
rubygems.mydomain.com/latest_specs.4.8.gz
重定向位置将链接到各个域(一些rubygems子域,Amazon S3,rubygems镜像).
当前状态
在摆弄了Nginx之后,我发现this blog post与我想要达到的非常接近.但是,我对Varnish如何使其正常工作知之甚少.
那是我当前的配置文件
import std; backend rubygems { .host = "rubygems.org"; .port = "80"; } sub vcl_recv { std.syslog(180,"RECV: " + req.http.host + req.url); if (!req.url ~ "^http") { std.syslog(180,"FETCH"); set req.backend = rubygems; return (lookup); } } sub vcl_fetch { if (beresp.status == 302) { set beresp.http.X-Magic-Redirect = "1"; return(deliver); } } sub vcl_hit { if (obj.http.X-Magic-Redirect == "1") { set req.url = obj.http.Location; return (restart); } } sub vcl_deliver { if (resp.http.X-Magic-Redirect == "1") { unset resp.http.X-Magic-Redirect; return(restart); } return(deliver); }
我可以执行请求,但它会响应错误:
curl -is http://localhost:8080/latest_specs.4.8.gz HTTP/1.1 302 Found Server: Varnish Content-Type: text/html; charset=utf-8 Retry-After: 5 Content-Length: 376 Accept-Ranges: bytes Date: Sat,01 Feb 2014 02:33:47 GMT X-Varnish: 933109322 Age: 1 Via: 1.1 varnish Connection: close <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> <title>302 Found</title> </head> <body> <h1>Error 302 Found</h1> <p>Found</p> <h3>Guru Meditation:</h3> <p>XID: 933109322</p> <hr> <p>Varnish cache server</p> </body> </html>
这是请求的相应syslog输出:
Jan 31 18:33:46 precise64 varnishd[2387]: RECV: localhost:8080/latest_specs.4.8.gz Jan 31 18:33:46 precise64 varnishd[2387]: FETCH Jan 31 18:33:47 precise64 varnishd[2387]: RECV: localhost:8080/latest_specs.4.8.gz Jan 31 18:33:47 precise64 varnishd[2387]: FETCH Jan 31 18:33:47 precise64 varnishd[2387]: RECV: localhost:8080http://production.s3.rubygems.org/latest_specs.4.8.gz
因此,对Rubygems的请求工作正常,但是重定向后不能按预期工作.如果有人能指出我正确的方向,我会很高兴的.
解决方法
此时,当您从rubygems后端收到302状态时,您必须在响应中的HTTP标头位置指定的新位置再次发出请求.
你应该得到类似的东西:
vcl_fetch { if (beresp.status == 302) { /* The content is on another location */ /* First change the host of the request*/ set req.http.host = regsub(regsub(beresp.http.Location,"^http://",""),"^([^/]+)/.*$","\1"); /* Then change the url of the request */ set req.url = regsub(beresp.http.Location,"^http://[^/]+/(.*)$","/\1"); return (restart); } }