情况描述

网站部署后，访问域名可看到 Welcome to nginx! 页面，但 Rails 未正常运行。

提示：

Passenger is running as root, and part(s) of the passenger root path (/home/deploy/.rvm/gems/ruby-2.4.1/gems/passenger-5.1.11) can be changed by non-root user(s).
Change the owner of the path to root, or avoid running Passenger as root.

谷歌搜到同样的问题 https://stackoverflow.com/questions/46855906/how-can-i-avoid-phusion-passenger-running-as-root ，但是没解决办法。

麻烦大家指点一下，谢谢。

版本情况

Ubuntu14.04, Ruby2.4.1, Rails 5.1.4 , passenger-5.1.11

/opt/nginx/logs/error.log

[ N 2017-10-25 22:44:33.5315 30646/T1 age/Wat/WatchdogMain.cpp:1267 ]: Starting Passenger watchdog...                                                                                            
[ N 2017-10-25 22:44:33.5369 30649/T1 age/Cor/CoreMain.cpp:1165 ]: Starting Passenger core...                                                                                                    
[ N 2017-10-25 22:44:33.5370 30649/T1 age/Cor/CoreMain.cpp:249 ]: Passenger core running in multi-application mode.                                                                              
[ W 2017-10-25 22:44:33.5402 30649/T1 age/Cor/CoreMain.cpp:897 ]: WARNING: potential privilege escalation vulnerability. Passenger is running as root, and part(s) of the passenger root path (/home/deploy/.rvm/gems/ruby-2.4.1/gems/passenger-5.1.11) can be changed by non-root user(s):                                                                                                       
The path "/home/deploy/.rvm/gems/ruby-2.4.1/gems/passenger-5.1.11" can be modified by user "deploy" (or applications running as that user). Change the owner of the path to root, or avoid running Passenger as root.                                                                                                                                                                             
The path "/home/deploy/.rvm/gems/ruby-2.4.1/gems" can be modified by user "deploy" (or applications running as that user). Change the owner of the path to root, or avoid running Passenger as root.                                                                                                                                                                                              
The path "/home/deploy/.rvm/gems/ruby-2.4.1" can be modified by user "deploy" (or applications running as that user). Change the owner of the path to root, or avoid running Passenger as root.  
The path "/home/deploy/.rvm/gems" can be modified by user "deploy" (or applications running as that user). Change the owner of the path to root, or avoid running Passenger as root.             
The path "/home/deploy/.rvm" can be modified by user "deploy" (or applications running as that user). Change the owner of the path to root, or avoid running Passenger as root.                  
The path "/home/deploy" can be modified by user "deploy" (or applications running as that user). Change the owner of the path to root, or avoid running Passenger as root.       

ngnix

sudo service nginx start 
ps auxw | grep nginx

root     30656  0.0  0.0  32960   860 ?        Ss   22:44   0:00 nginx: master process /opt/nginx/sbin/nginx                                                                                     
deploy   30657  0.0  0.3  33416  3748 ?        S    22:44   0:00 nginx: worker process   

解决办法

参考：https://stackoverflow.com/questions/20824071/nginx-welcome-to-nginx-page-keeps-showing 解决办法：

sudo vim /opt/nginx/conf/nginx.conf

删除配置文件中以下内容

# location / { # root html; # index index.html index.htm; # passenger_enabled on; # }

重启 nginx 就行了。