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为什么 apache 会出现 DNS 查找失败的情况？

tag-icon • tag-icon centos apache-httpd tomcat
为什么 apache 会出现 DNS 查找失败的情况？

CentOS 7 Web 服务器有 tomcat 在 apache httpd 反向代理后面提供 war 文件。当 WAR 文件都是服务器端代码时，这非常有效。但是，当客户端代码（在本例中为 AngularJS）与服务器端代码一起包含在 war 文件中时，在domain3.comWeb 浏览器中键入时，apache httpd 2.4 会针对应用程序中核心 html 文件的每个依赖项抛出以下代理错误：

[proxy:error] AH00898: DNS lookup failure for: resources returned by /res$

为了确认这是一个apache错误而不是tomcat错误，我在firewalld中打开了该应用程序的8084端口，然后加载domain3.com:8084以发现该应用程序运行良好，包括其客户端、AngularJS、代码。

需要进行哪些配置更改才能使 apache httpd 2.4 能够在向domain3.comWeb 浏览器中输入请求时为战争中包含的客户端应用程序提供包含内容？

此类domain3.com事务的完整 httpd 日志如下：

[Tue Nov 03 14:31:57.662516 2015] [proxy:error] [pid 9332] [client client.ip.addr:57369] AH00898: DNS lookup failure for: server.ip.addr:8013resources returned by /res$
[Tue Nov 03 14:31:57.747345 2015] [proxy:error] [pid 9332] [client client.ip.addr:57369] AH00898: DNS lookup failure for: server.ip.addr:8013resources returned by /res$
[Tue Nov 03 14:31:57.752815 2015] [proxy:error] [pid 9294] [client client.ip.addr:57370] AH00898: DNS lookup failure for: server.ip.addr:8013js returned by /js/lib/ang$
[Tue Nov 03 14:31:57.757663 2015] [proxy:error] [pid 11936] [client client.ip.addr:57372] AH00898: DNS lookup failure for: server.ip.addr:8013js returned by /js/lib/an$
[Tue Nov 03 14:31:57.758121 2015] [proxy:error] [pid 4325] [client client.ip.addr:57371] AH00898: DNS lookup failure for: server.ip.addr:8013js returned by /js/lib/ang$
[Tue Nov 03 14:31:57.758509 2015] [proxy:error] [pid 23006] [client client.ip.addr:57373] AH00898: DNS lookup failure for: server.ip.addr:8013js returned by /js/lib/an$
[Tue Nov 03 14:31:57.762749 2015] [proxy:error] [pid 9325] [client client.ip.addr:57374] AH00898: DNS lookup failure for: server.ip.addr:8013js returned by /js/lib/ang$
[Tue Nov 03 14:31:57.829953 2015] [proxy:error] [pid 9332] [client client.ip.addr:57369] AH00898: DNS lookup failure for: server.ip.addr:8013js returned by /js/lib/ang$
[Tue Nov 03 14:31:57.846174 2015] [proxy:error] [pid 9294] [client client.ip.addr:57370] AH00898: DNS lookup failure for: server.ip.addr:8013js returned by /js/lib/ang$
[Tue Nov 03 14:31:57.851022 2015] [proxy:error] [pid 4325] [client client.ip.addr:57371] AH00898: DNS lookup failure for: server.ip.addr:8013somecontroller.js returned$
[Tue Nov 03 14:31:58.049885 2015] [proxy:error] [pid 9332] [client client.ip.addr:57369] AH00898: DNS lookup failure for: server.ip.addr:8013js returned by /js/lib/ang$
[Tue Nov 03 14:31:58.207199 2015] [proxy:error] [pid 9332] [client client.ip.addr:57369] AH00898: DNS lookup failure for: server.ip.addr:8013js returned by /js/lib/ang$
[Tue Nov 03 14:31:58.320704 2015] [proxy:error] [pid 9332] [client client.ip.addr:57369] AH00898: DNS lookup failure for: server.ip.addr:8013js returned by /js/lib/ang$
[Tue Nov 03 14:31:58.428737 2015] [proxy:error] [pid 9332] [client client.ip.addr:57369] AH00898: DNS lookup failure for: server.ip.addr:8013js returned by /js/lib/ang$
[Tue Nov 03 14:31:58.523564 2015] [proxy:error] [pid 9332] [client client.ip.addr:57369] AH00898: DNS lookup failure for: server.ip.addr:8013js returned by /js/lib/ang$
[Tue Nov 03 14:31:58.611546 2015] [proxy:error] [pid 9332] [client client.ip.addr:57369] AH00898: DNS lookup failure for: server.ip.addr:8013js returned by /js/lib/ang$
[Tue Nov 03 14:31:58.708439 2015] [proxy:error] [pid 9332] [client client.ip.addr:57369] AH00898: DNS lookup failure for: server.ip.addr:8013somecontroller.js returned$

同一domain3.com事务的 Tomcat 日志仅显示一个成功的 GET 请求：

client.ip.addr - - [03/Nov/2015:14:31:57 -0500] "GET / HTTP/1.1" 200 2944

客户端将这些视为依赖项的 502 错误，但不是 502 错误index.html，这是唯一正确提供服务的资源。

的相关部分/etc/httpd/conf.d/virtualhosts.conf是：

<VirtualHost www.domain3.com:80>
    ServerName www.domain3.com
    ServerAlias domain3.com
    ErrorLog /var/log/httpd/domain3_com_error.log
    CustomLog /var/log/httpd/domain3_com_requests.log combined
    ProxyPass / ajp://server.ip.addr:8013
    ProxyPassReverse / ajp://server.ip.addr:8013
</VirtualHost>

那么，为了满足httpd应用程序客户端部分中包含文件的请求，我需要更改哪些内容domain3.com？

答案1

将缺少的尾部斜杠添加到您的ProxyPassandProxyPassReverse指令中：

ProxyPass / ajp://server.ip.addr:8013/
ProxyPassReverse / ajp://server.ip.addr:8013/

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