Varnish:503 后端获取失败/Varnishlog 说：FetchError 没有后端

Question

编辑(1): “.timeout”值似乎没有任何作用。立即显示“503 Backend fetch failed”错误

原文解释： 我对清漆很陌生。任何帮助表示赞赏。每次尝试使用 Varnish 调用我的网页时，我都会收到以下错误：

<body>
    <h1>Error 503 Backend fetch failed</h1>
    <p>Backend fetch failed</p>
    <h3>Guru Meditation:</h3>
    <p>XID: 3</p>
    <hr>
    <p>Varnish cache server</p>
</body>

背景： : 我有一个文件 index.php:

以下作品：

curl --header "Host: serverx.dev" 192.168.56.10:8080/index.php

以下不起作用并抛出 "Backend fetch failed" 错误：

curl --header "Host: serverx.dev" 192.168.56.10:80/index.php

我使用以下：

Virtualbox 5.0.32 r112930
Host operating system: Windows 7 (64-bit)
Guest operating system: Debian Jessie (minimal install)
Apache2   -----port 8080
varnish-4.1.5 revision 2c82b1c   -----port 80

default.vcl:

vcl 4.0;
# import default varnish library
import std;
import directors;
backend server1 {
    .host = "192.168.56.10";
    .port = "8080";
    .probe = {
        .url = "/robots.txt";
        .interval = 5s;
        .timeout = 50s;
        .window = 5;
        .threshold = 3;
    }
}
sub vcl_init {
    new cluster = directors.round_robin();
    cluster.add_backend(server1);
}

以下是当前清漆状态：

root@debian:/etc/varnish# ps -ef | grep varnish
varnish   4210     1  0 11:26 ?        00:00:00 /usr/sbin/varnishd -a :80 -T localhost:6082 -f /etc/varnish/default.vcl -S /etc/varnish/secret -s malloc,256m
vcache    4211  4210  0 11:26 ?        00:00:00 /usr/sbin/varnishd -a :80 -T localhost:6082 -f /etc/varnish/default.vcl -S /etc/varnish/secret -s malloc,256m
root      4632  1470  0 11:40 pts/0    00:00:00 grep varnish

还有：

root@debian:/etc/varnish# netstat -anp | grep varnish
tcp        0      0 127.0.0.1:6082          0.0.0.0:*               LISTEN      4210/varnishd
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      4210/varnishd
tcp6       0      0 ::1:6082                :::*                    LISTEN      4210/varnishd
tcp6       0      0 :::80                   :::*                    LISTEN      4210/varnishd
unix  2      [ ]         DGRAM                    35213    4210/varnishd

Apache2:

root@debian:/etc/varnish# netstat -anp | grep apache2
tcp6       0      0 :::443                  :::*                    LISTEN      4461/apache2
tcp6       0      0 :::8080                 :::*                    LISTEN      4461/apache2

varnishlog 给出以下输出

-   BereqHeader    X-Varnish: 51
-   VCL_call       BACKEND_FETCH
-   VCL_return     fetch
-   FetchError     Director cluster returned no backend
-   FetchError     No backend
-   Timestamp      Beresp: 1490091185.165509 0.000027 0.000027
-   Timestamp      Error: 1490091185.165513 0.000030 0.000004
-   BerespProtocol HTTP/1.1
-   BerespStatus   503
-   BerespReason   Service Unavailable
-   BerespReason   Backend fetch failed
-   BerespHeader   Date: Tue, 21 Mar 2017 10:13:05 GMT
-   BerespHeader   Server: Varnish
-   VCL_call       BACKEND_ERROR

我很乐意提供更多信息。

Answer 1

问题似乎出在 default.vcl。更改 .url 中的值后 .probe ，清漆正常工作。

之前:

backend server1 {
    .host = "192.168.56.10";
    .port = "8080";
    .probe = {
        .url = "/robots.txt";
        .interval = 5s;
        .timeout = 50s;
        .window = 5;
        .threshold = 3;
    }
}

现在：（这个有效）

backend server1 {
    .host = "192.168.56.10";
    .port = "8080";
    .probe = {
        .url = "/";        -------The change was made here
        .interval = 5s;
        .timeout = 50s;
        .window = 5;
        .threshold = 3;
    }
}

Varnish:503 后端获取失败/Varnishlog 说：FetchError 没有后端

Varnish:503 Backend fetch failed / Varnishlog says: FetchError No backend

php

apache2

varnish