2015/05/11 19:34:04 [notice] 21#0: using the "epoll" event method
2015/05/11 19:34:04 [notice] 21#0: nginx/1.2.5
2015/05/11 19:34:04 [notice] 21#0: built by gcc 4.4.7 20120313 (Red Hat 4.4.7-4) (GCC) 
2015/05/11 19:34:04 [notice] 21#0: OS: Linux 2.6.32-431.el6.x86_64
2015/05/11 19:34:04 [notice] 21#0: getrlimit(RLIMIT_NOFILE): 1024:4096
2015/05/11 19:34:04 [notice] 27#0: start worker processes
2015/05/11 19:34:04 [notice] 27#0: start worker process 29
2015/05/11 19:34:04 [alert] 29#0: setrl大带宽服务器imit(RLIMIT_NOFILE, 65535) failed (1: Operation not permitted)

很明显你配置里有 worker_rlimit_nofile
http://nginx.org/en/docs/ngx_core_module.html/>而且你没有以root身份运行
RTFM&STFW 标题党很恶心