通过apache访问php出现500 Internal Server Error错误问题解决

我今天发现相同php代码部署到两台服务器上，有一台服务器的完全正常，但是另一台上有一个页面出现500错误，而其它页面是正常的

错误：

[root@operation5 ~]# curl -kvL --cookie "PHPSESSID=6da651d4a9aa8bdef463cf3580586c2e"  -H "HOST:test.com"
* About to connect() to 1.1.1.1 port 80
*   Trying 1.1.1.1... connected
* Connected to 1.1.1.1 (1.1.1.1) port 80
> GET /admin/generatetest/id/1 HTTP/1.1
> User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
> Accept: */*
> Cookie: PHPSESSID=6da651d4a9aa8bdef463cf3580586c2e
> HOST:test.com
>
< HTTP/1.0 500 Internal Server Error
< Date: Thu, 26 Apr 2012 09:31:18 GMT
< Server: Apache/2.2.21 (Unix) mod_ssl/2.2.21 OpenSSL/0.9.8e-fips-rhel5 DAV/2 PHP/5.2.4
< X-Powered-By: PHP/5.2.4
< Expires: Thu, 19 Nov 1981 08:52:00 GMT
< Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
< Pragma: no-cache
< Content-Length: 0
< Connection: close
< Content-Type: text/html; charset=utf-8
* Closing connection #0

这两台服务器的前端是nginx代理，而这两台服务器上用的是apache

解决过程如下：

1.开始我怀疑是nginx的代理时间太短，因为这个页面的执行时间是1分半，于是改了，但是还是出现相同的错误

nginx修改为

server 1.1.1.1 max_fails=2 fail_timeout=180s;

php.ini修改为300s

max_execution_time = 300     ; Maximum execution time of each script, in seconds

2.在php里增加set_time_limit(0)，还是一样

3.修改php文件权限为755,还是一样

4.最后怀疑是从数据库里读出的数据量太大，程序里取出的数据有将近2000条，超过php设置的最大内存数

于是把php.ini里的128M调到512M,访问变为200 ok

memory_limit = 512M      ; Maximum amount of memory a script may consume (128MB)

测试成功：

[root@operation5 ~]# curl -kvL --cookie "PHPSESSID=6da651d4a9aa8bdef463cf3580586c2e"  -H "HOST:test.com"
* About to connect() to 1.1.1.1 port 80
*   Trying 1.1.1.1... connected
* Connected to 1.1.1.1 (1.1.1.1) port 80
> GET /admin/generatetest/id/1 HTTP/1.1
> User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
> Accept: */*
> Cookie: PHPSESSID=6da651d4a9aa8bdef463cf3580586c2e
> HOST:test.com
>
< HTTP/1.1 200 OK
< Date: Thu, 26 Apr 2012 09:35:56 GMT
< Server: Apache/2.2.21 (Unix) mod_ssl/2.2.21 OpenSSL/0.9.8e-fips-rhel5 DAV/2 PHP/5.2.4
< X-Powered-By: PHP/5.2.4
< Expires: Thu, 19 Nov 1981 08:52:00 GMT
< Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
< Pragma: no-cache
< Content-Length: 7
< Content-Type: text/html; charset=utf-8
Connection #0 to host 1.1.1.1 left intact
* Closing connection #0
success[root@operation5 ~]#