我在 centos 6.5 上部署了 passenger+nginx，用的方法是 gem install passenger passenger-install-nginx-module 整个过程没有错误提示，然后我运行 sudo ~/nginx/sbin/nginx

出现错误提示： nginx: [alert] Unable to start the Phusion Passenger watchdog because it encountered the following error during startup: Unable to start the Phusion Passenger logging agent: it seems to have crashed during startup for an unknown reason, with exit code 1 (-1: Unknown error)

运行 sudo ~/nginx/sbin/nginx -t 说明设置正确，但出现相同错误 nginx: the configuration file /home/lq/nginx/conf/nginx.conf syntax is ok nginx: [alert] Unable to start the Phusion Passenger watchdog because it encountered the following error during startup: Unable to start the Phusion Passenger logging agent: it seems to have crashed during startup for an unknown reason, with exit code 1 (-1: Unknown error) nginx: configuration file /home/lq/nginx/conf/nginx.conf test is successful

请问这是什么原因？需要怎么处理？谢谢

相关系统如下： ruby 2.1.0 rails 4.2.1 gem 2.4.6 passenger 5.0.5 nginx 1.6.2