问题：

nginx: [alert] could not open error log file: open() "/usr/local/nginx/logs/error.log" failed (2: No such file or directory)
2012/04/28 15:34:29 [emerg] 25637#0: open() "/usr/local/nginx/conf/nginx.conf" failed (2: No such file or directory)

解决：

nginx -p /app/nginx -c /app/nginx/conf/nginx.conf