Apache的502错误 - 服务器挂机 [英] Apache 502 Error - Server Hang up

问题描述

我使用的EC2实例（T2中）与Apache，MySQL和PHP。我收到定期502（服务器挂机）错误。试图找到从本周一的解决方案，但都没有能够解决这个问题。

I am using EC2 instance (t2 Medium) with Apache, MySQL and PHP. I am getting on regular basis 502(Server Hangup) error. Trying to find a solution from week but didn't able to resolve it.

我使用 mpm_ prefork 与服务器配置。

<IfModule mpm_prefork_module>

    StartServers             15

    MinSpareServers          15

    MaxSpareServers          25

    MaxRequestWorkers        200

    MaxConnectionsPerChild   1000
</IfModule>

也没能看到502状态code。在访问和放大器;错误日志。

Also not able to see 502 status code in access & error logs.

任何建议将是非常有益的。

Any suggestion will be very helpful.

推荐答案

一般实例状态检查将验证您的实例的操作系统是接受流量。

Generally 'Instance Status Check' verifies that your instance's operating system is accepting traffic.

当它失败就意味着实例中的操作系统不响应的流量，例如，当一个Windows实例挂起或会发生这种情况时，一个Linux实例内核恐慌或网络的实例中禁用。

When it fails it means that the operating system inside the instance is not responding to traffic, for example this can happen when a Windows instance hangs or when a Linux instance kernel panics or network is disabled inside the instance.

502错误网关也可能是Web服务器没有响应及时的方式，这是符合事实的CloudWatch已录常数100％的CPU使用率的情况下的一个标志。

"502 Bad Gateway" could also be a sign of the webserver not responding in timely manner, which is in line with the fact that CloudWatch has recorded constant 100% CPU usage for your instance.

鉴于您的实例是t.micro例如，如果高负载是合法的，你可能要考虑迁移到类似的m1.small例如一个更大的实例类型。

Given the fact that your instance is a t.micro instance, if the high load is legitimate you may want to consider migrating to a larger instance type like m1.small for example.

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