? 一台服务器重启，发现apache竟然不能启动，检查log，输出如下：
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[Mon Nov 24 12:18:07.284592 2014] [mpm_worker:alert] [pid 4786:tid 140480065836800] (11)Resource temporarily unavailable: apr_thread_create: unable to create worker thread [Mon Nov 24 12:18:07.284815 2014] [mpm_worker:emerg] [pid 5252:tid 140479788164864] (22)Invalid argument: ap_queue_info_set_idle failed. Attempting to shutdown process gracefully. [Mon Nov 24 12:18:07.284895 2014] [mpm_worker:alert] [pid 4963:tid 140480382359360] (11)Resource temporarily unavailable: AH00282: apr_thread_create: unable to create worker thread [Mon Nov 24 12:18:07.284913 2014] [mpm_worker:alert] [pid 5328:tid 140480065836800] (11)Resource temporarily unavailable: apr_thread_create: unable to create worker thread [Mon Nov 24 12:18:07.284906 2014] [unixd:alert] [pid 5354:tid 140480382359360] (11)Resource temporarily unavailable: AH02162: setuid: unable to change to uid: 2
? Google之，试了无数种说法以后发现资源受限的说法比较靠谱。修改并保存，问题解决。但其实还是不懂怎么看得出来是什么错误，只好记下来再说了。
#修改 用户最大进程数 ulimit -u unlimited #保存修改到自启动文件 echo ulimit -u unlimited >>/etc/profile
?既然这个有问题，其他的资源同样可能有问题，如果不行可以逐个ulimit
试试。
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原文：http://naso.iteye.com/blog/2159706