我已经设置了 apache 和 Varnish，无需特别配置（apache 在 8080 上，varnish 在端口 80 上提供页面）。我还在 Varnish 中放置了 cookie，以确保最大程度地缓存 Wordpress 网站。
网站可以正常运行，可以加载等等；但 Varnish 似乎不缓存任何东西。当我打开 Varnishstat 时，我总是看到 Hitrate ratio: 0；以及大量“inf backend_busy”、“inf backend_reuse”等等；并且没有 accepted_connections。以下是示例：
0+00:00:00
Hitrate ratio: 0 0 0
Hitrate avg: 0.0000 0.0000 0.0000
146 0.00 inf backend_busy - Backend conn. too many
164 0.00 inf backend_reuse - Backend conn. reuses
16 0.00 inf backend_toolate - Backend conn. was closed
101 0.00 inf backend_recycle - Backend conn. recycles
47 0.00 inf backend_retry - Backend conn. retry
111 0.00 inf fetch_head - Fetch head
怎么会？
更新：Varnishlog：
0 CLI - Rd ping
0 CLI - Wr 200 19 PONG 1394712509 1.0
0 CLI - Rd ping
0 CLI - Wr 200 19 PONG 1394712512 1.0
0 CLI - Rd ping
0 CLI - Wr 200 19 PONG 1394712515 1.0
13 BackendClose - default
13 BackendOpen b default 127.0.0.1 38776 127.0.0.1 8080
13 BackendXID b 1420058564
13 TxRequest b GET
13 TxURL b /
13 TxProtocol b HTTP/1.1
13 TxHeader b Host: www.test-mystreaming.it
13 TxHeader b Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
13 TxHeader b User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.146 Safari/537.36
13 TxHeader b Accept-Language: en-US,en;q=0.8,it-IT;q=0.6,it;q=0.4
13 TxHeader b X-Forwarded-For: 2.229.61.20
13 TxHeader b X-Varnish: 1420058564
13 TxHeader b Accept-Encoding: gzip
13 RxProtocol b HTTP/1.1
13 RxStatus b 200
13 RxResponse b OK
13 RxHeader b Date: Thu, 13 Mar 2014 12:08:37 GMT
13 RxHeader b Server: Apache/2.2.22 (Ubuntu)
13 RxHeader b X-Powered-By: PHP/5.3.10-1ubuntu3.10
13 RxHeader b X-Pingback: http://www.test-mystreaming.it/xmlrpc.php
13 RxHeader b Vary: Accept-Encoding
13 RxHeader b Content-Encoding: gzip
13 RxHeader b Content-Length: 7682
13 RxHeader b Content-Type: text/html; charset=UTF-8
13 Fetch_Body b 4(length) cls 0 mklen 1
13 Length b 7682
13 BackendReuse b default
11 SessionOpen c 2.229.61.20 56012 :80
11 ReqStart c 2.229.61.20 56012 1420058564
11 RxRequest c GET
11 RxURL c /
11 RxProtocol c HTTP/1.1
11 RxHeader c Host: www.test-mystreaming.it
11 RxHeader c Connection: keep-alive
11 RxHeader c Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
11 RxHeader c User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.146 Safari/537.36
11 RxHeader c Accept-Encoding: gzip,deflate,sdch
11 RxHeader c Accept-Language: en-US,en;q=0.8,it-IT;q=0.6,it;q=0.4
11 RxHeader c Cookie: wp-settings-1=m5%3Do%26m4%3Do%26hidetb%3D1%26m9%3Do%26m1%3Do%26imgsize%3Dfull%26editor%3Dhtml%26libraryContent%3Dbrowse; wp-settings-time-1=1394014590; _xyz_lbx_until=1; _xyz_lbx_pc=1; __utma=257699214.1231191244.1394014450.1394039099.1394709725.5
11 VCL_call c recv lookup
11 VCL_call c hash
11 Hash c /
11 Hash c www.test-mystreaming.it
11 VCL_return c hash
11 VCL_call c miss fetch
11 Backend c 13 default default
11 TTL c 1420058564 RFC 120 -1 -1 1394712518 0 1394712517 0 0
11 VCL_call c fetch deliver
11 ObjProtocol c HTTP/1.1
11 ObjResponse c OK
11 ObjHeader c Date: Thu, 13 Mar 2014 12:08:37 GMT
11 ObjHeader c Server: Apache/2.2.22 (Ubuntu)
11 ObjHeader c X-Powered-By: PHP/5.3.10-1ubuntu3.10
11 ObjHeader c X-Pingback: http://www.test-mystreaming.it/xmlrpc.php
11 ObjHeader c Vary: Accept-Encoding
11 ObjHeader c Content-Encoding: gzip
11 ObjHeader c Content-Type: text/html; charset=UTF-8
11 Gzip c u F - 7682 33861 80 80 61389
11 VCL_call c deliver deliver
11 TxProtocol c HTTP/1.1
11 TxStatus c 200
11 TxResponse c OK
11 TxHeader c Server: Apache/2.2.22 (Ubuntu)
11 TxHeader c X-Powered-By: PHP/5.3.10-1ubuntu3.10
11 TxHeader c X-Pingback: http://www.test-mystreaming.it/xmlrpc.php
11 TxHeader c Vary: Accept-Encoding
11 TxHeader c Content-Encoding: gzip
11 TxHeader c Content-Type: text/html; charset=UTF-8
11 TxHeader c Content-Length: 7682
11 TxHeader c Accept-Ranges: bytes
11 TxHeader c Date: Thu, 13 Mar 2014 12:08:38 GMT
11 TxHeader c X-Varnish: 1420058564
11 TxHeader c Age: 0
11 TxHeader c Via: 1.1 varnish
11 TxHeader c Connection: keep-alive
11 Length c 7682
11 ReqEnd c 1420058564 1394712517.488089323 1394712518.017520905 0.000098944 0.529357433 0.000074148
0 CLI - Rd ping
0 CLI - Wr 200 19 PONG 1394712518 1.0
0 CLI - Rd ping
0 CLI - Wr 200 19 PONG 1394712521 1.0
答案1
要确定响应是否可缓存，请将以下内容添加到您的 VCL，并varnishlog在更改后使用输出更新您的问题。另外，请发布您的 varnish 命令行，尤其是默认 TTL（-t参数）。由于您的后端服务器未发送Cache-Control标头，并且您未beresp.ttl在 中定义vcl_fetch，因此 Varnish 使用通过-t开关定义的 TTL 默认值。
以下 VCL 将向每个请求添加X-Cacheable和标头。X-ttl
sub vcl_fetch {
# Varnish determined the object was not cacheable
if (!(beresp.ttl > 0s)) {
set beresp.http.X-Cacheable = "NO:Not Cacheable, ttl <0s";
set beresp.http.X-ttl = beresp.ttl;
return(hit_for_pass);
}
elseif (req.http.Cookie) {
set beresp.http.X-Cacheable = "NO:Got cookie";
set beresp.http.X-Cookie = req.http.Cookie;
return(hit_for_pass);
}
elseif (beresp.http.Cache-Control ~ "private") {
set beresp.http.X-Cacheable = "NO:Cache-Control=private";
return(hit_for_pass);
}
elseif (beresp.http.Cache-Control ~ "no-cache" || beresp.http.Pragma ~ "no-cache") {
set beresp.http.X-Cacheable = "Refetch forced by user";
return(hit_for_pass);
# You are extending the lifetime of the object artificially
}
elseif (beresp.ttl < 1s) {
set beresp.ttl = 5s;
set beresp.grace = 5s;
set beresp.http.X-Cacheable = "YES:FORCED";
# Varnish determined the object was cacheable
} else {
set beresp.http.X-Cacheable = "YES";
set beresp.http.X-ttl = beresp.ttl;
}
}