Zope / Plone 出现间歇性 502 代理错误“从远程服务器读取状态行时出错”
我们目前在 Zope 的一个实例上运行 Plone 3.3.6，在 Apache 2.2 后面有 4 个线程。我们有许多子站点，全部由一个 Plone 站点进行管理。
我目前正在测试一个新设置，运行 2 个 Zope 实例，每个实例 2 个线程，并由 Apache 进行负载平衡。我们有一个工具可以抓取我们的网站来检查错误，该工具报告了许多 502 代理错误。它在我们的实时站点上运行良好，通常也在我们的测试站点上运行良好。
正如预期的那样，我们在 Apache 访问日志中看到 502 错误。
10.10.11.1 - - [04/Feb/2012:14:34:46 +0000] "GET /family-strengthening HTTP/1.1" 502 345 "-" "Mozilla"
我们还在 Apache 错误日志中获得一个条目
[Sat Feb 04 14:34:46 2012] [error] [client 10.10.11.1] proxy: error reading status line from remote server dev:18082
[Sat Feb 04 14:34:46 2012] [error] [client 10.10.11.1] proxy: Error reading from remote server returned by /family-strengthening
有时，Zope 访问日志显示请求有 200 个响应，但服务字节数为 0
./instance2-Z2.log:10.10.11.4 - Anonymous [04/Feb/2012:14:34:47 +0100] "GET /VirtualHostBase/http/test.street-children.org.uk:80/sos/soschildrensvillages_org_uk/street-children_org_uk/VirtualHostRoot/family-strengthening HTTP/1.1" 200 0 "" "Mozilla"
其他时候，该请求不会显示在 Zope 访问日志中。
Zope 实例日志中没有错误。
当我通过浏览器请求相同的页面时，我从未收到错误。再次运行我们的蜘蛛会导致类似数量的 502 错误，但页面不同。
我认为我们站点的 Apache 配置非常标准：
ProxyPreserveHost On
<Proxy balancer://zopes>
BalancerMember http://dev:18081
BalancerMember http://dev:18082
</Proxy>
RewriteRule ^/(.*) balancer://zopes/VirtualHostBase/http/%{SERVER_NAME}:80/sos/soschildrensvillages_org_uk/%{ENV:SOS_PLONE_FOLDER_SHORTNAME}/VirtualHostRoot/$1 [last,proxy]
我不知道从哪里开始尝试调试它，因此我们将不胜感激。
We're currently running Plone 3.3.6 on one instance of Zope with 4 threads behind Apache 2.2. We have a number of subsites all managed from one Plone site.
I'm currently testing a new set-up running 2 Zope instances, 2 threads each, and load balanced by Apache. We have a tool that spiders our sites to check for errors and this is reporting a number of 502 proxy errors. It runs fine on our live sites and usually also on our test sites.
As expected we see a 502 error in the Apache access log.
10.10.11.1 - - [04/Feb/2012:14:34:46 +0000] "GET /family-strengthening HTTP/1.1" 502 345 "-" "Mozilla"
We also get an entry in the Apache error log
[Sat Feb 04 14:34:46 2012] [error] [client 10.10.11.1] proxy: error reading status line from remote server dev:18082
[Sat Feb 04 14:34:46 2012] [error] [client 10.10.11.1] proxy: Error reading from remote server returned by /family-strengthening
Sometimes Zope access log shows the request with 200 response but with 0 bytes served
./instance2-Z2.log:10.10.11.4 - Anonymous [04/Feb/2012:14:34:47 +0100] "GET /VirtualHostBase/http/test.street-children.org.uk:80/sos/soschildrensvillages_org_uk/street-children_org_uk/VirtualHostRoot/family-strengthening HTTP/1.1" 200 0 "" "Mozilla"
Other times the request does not show up in the Zope access log.
There are no errors in the Zope instance logs.
When I request the same pages through a browser I never receive the error. Running our spider again results in a similar number of 502 errors but for different pages.
I think our Apache configuration for our sites is pretty standard:
ProxyPreserveHost On
<Proxy balancer://zopes>
BalancerMember http://dev:18081
BalancerMember http://dev:18082
</Proxy>
RewriteRule ^/(.*) balancer://zopes/VirtualHostBase/http/%{SERVER_NAME}:80/sos/soschildrensvillages_org_uk/%{ENV:SOS_PLONE_FOLDER_SHORTNAME}/VirtualHostRoot/$1 [last,proxy]
I don't know where to start trying to debug this so any help would be much appreciated.
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更新
我以为我可以通过停止 Apache 然后启动 Apache 来解决这个问题
问题在测试系统上消失了，只有在我切换到两个 Zopes 后才会出现那里。
我一直在优雅地重新启动 Apache。每次我们优雅地重新启动时，我们的 apache 错误日志中也会出现如下错误，
我读到这些是无害的，但也许不是？它们不再出现在停止/启动后的正常重启中
Update
I thought I'd resolved this by doing an Apache stop and then Apache start
The problem went away on the test system only to appear on live once I switched to two Zopes there.
I had been restarting Apache gracefully. We had also been getting errors like the following in our apache error log every time we gracefully restarted
I had read that these were harmless but maybe not? They no longer appear on graceful restart after the stop / start