添加清漆禁令但返回旧对象

编程问答 2022-05-31

问题描述

我在切片服务器前使用 varnish 来缓存 mapbox 切片。为了移除旧图块，我打算使用禁令来有效地移除大量缓存的图块。我的问题是 varnish 仍然使用缓存的对象（至少响应中的 age 表明了这一点）并且不联系后端。

我首先请求 http://varnish/5/3/4.pbf，然后添加带有 curl -X BAN -H 'X-Purge-Regex: 5/3/4.pbf' varnish 或 varnishadm 的禁令，然后是 ban obj.http.url ~ 5/3/4.pbf，然后请求 http ://varnish/5/3/4.pbf 再次。

一开始我的禁止列表是空的：

Present bans:
1610117471.434488     1 C

使用 curl -X BAN -H 'X-Purge-Regex: 5/3/4.pbf' varnish

成功添加禁令 
<!DOCTYPE html>
<html>
  <head>
    <title>200 Ban added</title>
  </head>
  <body>
    <h1>Error 200 Ban added</h1>
    <p>Ban added</p>
    <h3>Guru Meditation:</h3>
    <p>XID: 8</p>
    <hr>
    <p>Varnish cache server</p>
  </body>
</html>

并出现在禁止列表中

Present bans:
1610117369.028870     0 -  obj.http.url ~ 5/3/4.pbf
1610117307.220739     1 C

再次请求http://varnish/5/3/4.pbf后，ban列表显示使用了ban

Present bans:
1610117471.434488     1 -  obj.http.url ~ 5/3/4.pbf

但是响应的年龄不是 0，因为它仍然是第一个请求的对象。

一段时间后，禁令被解除：

Present bans:
1610117471.434488     1 C

我的 vcl_recv 看起来像这样，但错误可能在其他地方，因为它也不适用于 varnishadm：

sub vcl_recv {
    unset req.http.cookie;

    # Allowing PURGE from localhost
    if (req.method == "BAN"||req.method == "PURGE") {
                if (!client.ip ~ purge) {
                        return(synth(405,"Not allowed."));
                }
                if (req.method == "BAN") {
                    ban("obj.http.url ~ " + req.http.X-Purge-Regex);

                    # Throw a synthetic page so the
                    # request won't go to the backend.
                    return(synth(200,"Ban added"));
                }
                if (req.method == "PURGE") {
                    return (purge);
                }
        }
}

我也尝试使用 https://stackoverflow.com/a/61507014 中的 vcl_purge 但这似乎对禁止 (?) 没有帮助。

我使用 X-Purge-Regex 标头是为了不用担心必须像 https://stackoverflow.com/a/38526921 中那样转义特殊字符，但只是像 obj.http.url ~ 0 这样的禁令是行不通的。

我使用的是 varnish 6.5 和 vcl 4.0。

禁止请求

*   << Request  >> 54        
-   Begin          req 53 rxreq
-   Timestamp      Start: 1610121483.345437 0.000000 0.000000
-   Timestamp      Req: 1610121483.345437 0.000000 0.000000
-   VCL_use        boot
-   ReqStart       192.168.48.2 50882 http
-   ReqMethod      BAN
-   ReqURL         /
-   ReqProtocol    HTTP/1.1
-   ReqHeader      Host: varnish-volatile
-   ReqHeader      User-Agent: curl/7.64.0
-   ReqHeader      Accept: */*
-   ReqHeader      X-Purge-Regex: 0
-   ReqHeader      X-Forwarded-For: 192.168.48.2
-   VCL_call       RECV
-   VCL_acl        MATCH purge "importer"
-   VCL_return     synth
-   VCL_call       HASH
-   VCL_return     lookup
-   RespProtocol   HTTP/1.1
-   RespStatus     200
-   RespReason     Ban added
-   RespHeader     Date: Fri,08 Jan 2021 15:58:03 GMT
-   RespHeader     Server: Varnish
-   RespHeader     X-Varnish: 54
-   VCL_call       SYNTH
-   RespHeader     Content-Type: text/html; charset=utf-8
-   RespHeader     Retry-After: 5
-   VCL_return     deliver
-   Timestamp      Process: 1610121483.347281 0.001844 0.001844
-   RespHeader     Content-Length: 246
-   Storage        malloc Transient
-   Filters        
-   RespHeader     Accept-Ranges: bytes
-   RespHeader     Connection: keep-alive
-   Timestamp      Resp: 1610121483.347557 0.002120 0.000276
-   ReqAcct        98 0 98 218 246 464
-   End

添加禁止后获取

*   << Request  >> 32806     
-   Begin          req 32805 rxreq
-   Timestamp      Start: 1610121552.733872 0.000000 0.000000
-   Timestamp      Req: 1610121552.733872 0.000000 0.000000
-   VCL_use        boot
-   ReqStart       192.168.48.1 55176 http
-   ReqMethod      GET
-   ReqURL         /public.snow_db/0/0/0.pbf
-   ReqProtocol    HTTP/1.1
-   ReqHeader      Host: localhost:8090
-   ReqHeader      User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:84.0) Gecko/20100101 Firefox/84.0
-   ReqHeader      Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
-   ReqHeader      Accept-Language: en-US,en;q=0.5
-   ReqHeader      Accept-Encoding: gzip,deflate
-   ReqHeader      DNT: 1
-   ReqHeader      Connection: keep-alive
-   ReqHeader      Upgrade-Insecure-Requests: 1
-   ReqHeader      Pragma: no-cache
-   ReqHeader      Cache-Control: no-cache
-   ReqHeader      X-Forwarded-For: 192.168.48.1
-   VCL_call       RECV
-   ReqUnset       Host: localhost:8090
-   ReqHeader      host: localhost:8090
-   VCL_return     hash
-   ReqUnset       Accept-Encoding: gzip,deflate
-   ReqHeader      Accept-Encoding: gzip
-   VCL_call       HASH
-   VCL_return     lookup
-   Hit            28 601789.331504 10.000000 0.000000
-   VCL_call       HIT
-   VCL_return     deliver
-   RespProtocol   HTTP/1.1
-   RespStatus     200
-   RespReason     OK
-   RespHeader     content-encoding: gzip
-   RespHeader     content-type: application/x-protobuf
-   RespHeader     date: Fri,08 Jan 2021 15:09:02 GMT
-   RespHeader     Vary: Accept-Encoding
-   RespHeader     X-Varnish: 32806 28
-   RespHeader     Age: 3010
-   RespHeader     Via: 1.1 varnish (Varnish/6.5)
-   VCL_call       DELIVER
-   VCL_return     deliver
-   Timestamp      Process: 1610121552.734070 0.000197 0.000197
-   Filters        
-   RespHeader     Accept-Ranges: bytes
-   RespHeader     Content-Length: 295
-   RespHeader     Connection: keep-alive
-   Timestamp      Resp: 1610121552.734217 0.000345 0.000147
-   ReqAcct        414 0 414 272 295 567
-   End

重现问题

重现错误：

  • git clone https://github.com/Baschdl/varnish-ban-setup.git && cd varnish-ban-setup
  • docker-compose up
  • 打开 http://localhost:8092/5/3/1.pbf
  • docker-compose exec varnish varnishadm ban obj.http.url ~ pbf
  • 再次打开http://localhost:8092/5/3/1.pbf，你会得到旧的对象

解决方法

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