centos 6.3 64bit
cpu 双核
7.5G内存
php 5.3
apache 2
StartServers 20
MinSpareServers 20
MaxSpareServers 60
ServerLimit 10000
MaxClients 5000
MaxRequestsPerChild 1000
谷歌分析显示平时同时在线500到1200、晚上人最多。
日志：
[Wed Jun 25 20:40:35 2014] [alert] (11)Resource temporarily unavailable: setuid: unable to change to uid: 500
[Wed Jun 25 20:40:35 2014] [alert] (11)Resource temporarily unavailable: setuid: unable to change to uid: 500
[Wed Jun 25 20:40:35 2014] [alert] (11)Resource temporarily unavailable: setuid: unable to change to uid: 500
[Wed Jun 25 20:40:35 2014] [alert] (11)Resource temporarily unavailable: setuid: unable to change to uid: 500
[Wed Jun 25 20:40:35 2014] [alert] (11)Resource temporarily unavailable: setuid: unable to change to uid: 500
[Wed Jun 25 20:40:35 2014] [alert] (11)Resource temporarily unavailable: setuid: unable to change to uid: 500
[Wed Jun 25 20:40:35 2014] [alert] (11)Resource temporarily unavailable: setuid: unable to change to uid: 500
[Wed Jun 25 20:40:35 2014] [alert] Child 25763 returned a Fatal error... Apache is exiting!
[Wed Jun 25 20:40:35 2014] [alert] (11)Resource temporarily unavailable: setuid: unable to change to uid: 500
[Wed Jun 25 20:40:35 2014] [alert] (11)Resource temporarily unavailable: setuid: unable to change to uid: 500
这可能是啥问题、、、apache配置呢合理么？求教、
你截取的日志中的表现看是 apache 申请临时资源时的权限不能切换到uid是500的用户上，导致资源申请失败，这些日志还不能确定是否是导致apache挂掉的真正原因，可能还要多看一些日志
应该是500的uid 被系统的其他用户占用了吧，你删除此用户即可
转一篇日志http://weifly.iteye.com/blog/1259907，不知道有没有帮助