剛剛學習使用varnish，這個章節測試varnish的purge功能。
一、 配置vcl，在vcl中添加如下代碼。可以參考官網配置，http://www.varnish-cache.org/trac/wiki/VCLExamplePurging
- sub vcl_hit {
- if (req.request == "PURGE") {
- set obj.ttl = 0s;
- error 200 "Purged.";
- }
- }
- sub vcl_miss {
- if (req.request == "PURGE") {
- error 404 "Not in cache.";
- }
- }
二、 使用varnishadm來purge
1. 清除某個文件，$表示正則表達式的結尾附；
| /opt/varnish/bin/varnishadm -T :4488 purge.url test.jpg$ |
2. 清除某個文件夾
| varnishadm -T :4488 purge.url ^/images/.*$ |
三、通過varnishlog來驗證，訪問某個元素，每刷新一次，x-cache-hits會增加
| [root@VMSHcentos01 ~]# /opt/varnish/bin/varnishlog -i TxHeader 13 TxHeader c Date: Fri, 13 May 2011 06:28:18 GMT 13 TxHeader c Via: 1.1 varnish 13 TxHeader c X-Varnish: 1688554888 13 TxHeader c Last-Modified: Thu, 14 Apr 2011 03:52:45 GMT 13 TxHeader c Cache-Control: max-age=31536000 13 TxHeader c Connection: keep-alive 13 TxHeader c X-Cache: HIT 13 TxHeader c X-Cache-Hits: 1 13 TxHeader c Date: Fri, 13 May 2011 06:28:26 GMT 13 TxHeader c Via: 1.1 varnish 13 TxHeader c X-Varnish: 1688554889 13 TxHeader c Last-Modified: Thu, 14 Apr 2011 03:52:45 GMT 13 TxHeader c Cache-Control: max-age=31536000 13 TxHeader c Connection: keep-alive 13 TxHeader c X-Cache: HIT 13 TxHeader c X-Cache-Hits: 2 |
執行purge，
| /opt/varnish/bin/varnishadm -T :4488 purge.url 82839fc8-f49c-4191-bf02-420fe0c40310.jpg$ |
重新訪問，看到Hits是0.
|
15 TxHeader b X-Varnish: 1688554890 |