我在托管约30个网站的Rackspace云服务器上运行cPanel。我正在使用Varnish 3.0.3 + Apache 2.2.23。我得到了随机503错误。如果我重新启动httpd进程,它们会消失。我检查了Apache error_log,并且没有看到与503错误相关的任何内容。光油/阿帕奇随机503错误
这里是我的上光油的配置:
backend default {
.host = "198.61.161.65";
.port = "8080";
.connect_timeout = 600s;
.first_byte_timeout = 600s;
.between_bytes_timeout = 600s;
}
这里是我的光油启动参数:
-a :80 -f /etc/varnish/default.vcl -T 127.0.0.1:6082 -t 120 -w 1,1000,120 -u varnish -g varnish -S /etc/varnish/secret -p http_max_hdr=256 -p http_resp_hdr_len=8192 -p http_range_support=on -s malloc,768M
我跑varnishlog并记录一些错误。它们都具有TxResponse =服务不可用。对我而言,这意味着Apache没有及时响应Varnish的请求。这里有一个例子:
17 SessionOpen c 74.133.75.136 54227 :80
17 ReqStart c 74.133.75.136 54227 1219297893
17 RxRequest c GET
17 RxURL c/
17 RxProtocol c HTTP/1.1
17 RxHeader c Host: www.archerytrade.org
17 RxHeader c User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:20.0) Gecko/20100101 Firefox/20.0
17 RxHeader c Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
17 RxHeader c Accept-Language: en-US,en;q=0.5
17 RxHeader c Accept-Encoding: gzip, deflate
17 RxHeader c DNT: 1
17 RxHeader c Connection: keep-alive
17 VCL_call c recv lookup
17 VCL_call c hash
17 Hash c/
17 Hash c www.archerytrade.org
17 VCL_return c hash
17 VCL_call c miss fetch
17 Backend c 18 default default
17 FetchError c http first read error: -1 0 (Success)
17 VCL_call c error deliver
17 VCL_call c deliver deliver
17 TxProtocol c HTTP/1.1
17 TxStatus c 503
17 TxResponse c Service Unavailable
17 TxHeader c Server: Varnish
17 TxHeader c Content-Type: text/html; charset=utf-8
17 TxHeader c Retry-After: 5
17 TxHeader c Content-Length: 441
17 TxHeader c Accept-Ranges: bytes
17 TxHeader c Date: Wed, 17 Apr 2013 01:39:52 GMT
17 TxHeader c X-Varnish: 1219297893
17 TxHeader c Age: 0
17 TxHeader c Via: 1.1 varnish
17 TxHeader c Connection: close
17 Length c 441
17 ReqEnd c 1219297893 1366162792.398471832 1366162792.541639328 0.000244379 0.143036604 0.000130892
17 SessionClose c error
17 StatSess c 74.133.75.136 54227 0 1 1 0 0 0 257 441
我尝试添加以下到我的default.vcl文件:
sub vcl_recv {
set req.grace = 15s;
...
}
sub vcl_fetch {
if (beresp.status == 500 || beresp.status == 503) {
set beresp.saintmode = 10s;
return(restart);
}
set beresp.grace = 1h;
...
}
周围的一些503错误的时候,我发现PHP的致命错误,脚本过早结束头文件和请求超出了由于可能的配置错误导致的10个内部重定向的限制,在Apache error_log中。
我试着增加/减少清漆和超时值的内存。我试着添加更高的http_max_hdr和http_resp_hdr_len值。